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-------------------------- UNITED STATES OMB APPROVAL SECURITIES AND EXCHANGE COMMISSION -------------------------- OMB Number: 3235-0145 WASHINGTON, D.C. 20549 -------------------------- Expires: December 31, 2005 -------------------------- Estimated average burden SCHEDULE 13G hours per response...11 -------------------------- UNDER THE SECURITIES EXCHANGE ACT OF 1934 (AMENDMENT NO. 1)* DIGIRAD CORPORATION - -------------------------------------------------------------------------------- (Name of Issuer) COMMON STOCK, $0.001 PAR VALUE - -------------------------------------------------------------------------------- (Title of Class of Securities) 253827109 -------------------------------------------------------- (CUSIP Number) DECEMBER 31, 2006 - -------------------------------------------------------------------------------- (Date of Event Which Requires Filing of this Statement) Check the appropriate box to designate the rule pursuant to which this Schedule is filed: / / Rule 13d-1(b) / / Rule 13d-1(c) /X/ Rule 13d-1(d) *The remainder of this cover page shall be filled out for a reporting person's initial filing on this form with respect to the subject class of securities, and for any subsequent amendment containing information which would alter the disclosures provided in a prior cover page. The information required in the remainder of this cover page shall not be deemed to be "filed" for the purpose of Section 18 of the Securities Exchange Act of 1934 ("Act") or otherwise subject to the liabilities of that section of the Act but shall be subject to all other provisions of the Act (however, see the Notes). CUSIP No. 253827109 -------------- - ------------------------------------------------------------------------------- 1. Names of Reporting Persons I.R.S. Identification Nos. of above persons (entities only). VECTOR LATER-STAGE EQUITY FUND, L.P. - ------------------------------------------------------------------------------- 2. Check the Appropriate Box if a Member of a Group (See Instructions) (a) /X/ (b) / / - ------------------------------------------------------------------------------- 3. SEC Use Only - ------------------------------------------------------------------------------- 4. Citizenship or Place of Organization DELAWARE - ------------------------------------------------------------------------------- Number of Shares 5. Sole Voting Power Beneficially Owned by Each Reporting Person 0 With ---------------------------------------------------- 6. Shared Voting Power 901,312 ---------------------------------------------------- 7. Sole Dispositive Power 0 ---------------------------------------------------- 8. Shared Dispositive Power 901,312 - ------------------------------------------------------------------------------- 9. Aggregate Amount Beneficially Owned by Each Reporting Person 901,312 - ------------------------------------------------------------------------------- 10. Check if the Aggregate Amount in Row (9) Excludes Certain Shares (See Instructions) / / - ------------------------------------------------------------------------------- 11. Percent of Class Represented by Amount in Row (9) 4.8% - ------------------------------------------------------------------------------- 12. Type of Reporting Person (See Instructions) PN - ------------------------------------------------------------------------------- CUSIP No. 253827109 -------------- - ------------------------------------------------------------------------------- 1. Names of Reporting Persons I.R.S. Identification Nos. of above persons (entities only). VECTOR FUND MANAGEMENT, L.P. - ------------------------------------------------------------------------------- 2. Check the Appropriate Box if a Member of a Group (See Instructions) (a) /X/ (b) / / - ------------------------------------------------------------------------------- 3. SEC Use Only - ------------------------------------------------------------------------------- 4. Citizenship or Place of Organization DELAWARE - ------------------------------------------------------------------------------- Number of Shares 5. Sole Voting Power Beneficially Owned by Each Reporting Person 0 With ---------------------------------------------------- 6. Shared Voting Power 901,312 ---------------------------------------------------- 7. Sole Dispositive Power 0 ---------------------------------------------------- 8. Shared Dispositive Power 901,312 - ------------------------------------------------------------------------------- 9. Aggregate Amount Beneficially Owned by Each Reporting Person 901,312 - ------------------------------------------------------------------------------- 10. Check if the Aggregate Amount in Row (9) Excludes Certain Shares (See Instructions) / / - ------------------------------------------------------------------------------- 11. Percent of Class Represented by Amount in Row (9) 4.8% - ------------------------------------------------------------------------------- 12. Type of Reporting Person (See Instructions) PN - ------------------------------------------------------------------------------- CUSIP No. 253827109 -------------- - ------------------------------------------------------------------------------- 1. Names of Reporting Persons I.R.S. Identification Nos. of above persons (entities only). VECTOR LATER-STAGE EQUITY FUND II, L.P. - ------------------------------------------------------------------------------- 2. Check the Appropriate Box if a Member of a Group (See Instructions) (a) /X/ (b) / / - ------------------------------------------------------------------------------- 3. SEC Use Only - ------------------------------------------------------------------------------- 4. Citizenship or Place of Organization DELAWARE - ------------------------------------------------------------------------------- Number of Shares 5. Sole Voting Power Beneficially Owned by Each Reporting Person 0 With ---------------------------------------------------- 6. Shared Voting Power 296,929 ---------------------------------------------------- 7. Sole Dispositive Power 0 ---------------------------------------------------- 8. Shared Dispositive Power 296,929 - ------------------------------------------------------------------------------- 9. Aggregate Amount Beneficially Owned by Each Reporting Person 296,929 - ------------------------------------------------------------------------------- 10. Check if the Aggregate Amount in Row (9) Excludes Certain Shares (See Instructions) / / - ------------------------------------------------------------------------------- 11. Percent of Class Represented by Amount in Row (9) 1.6% - ------------------------------------------------------------------------------- 12. Type of Reporting Person (See Instructions) PN - ------------------------------------------------------------------------------- CUSIP No. 253827109 -------------- - ------------------------------------------------------------------------------- 1. Names of Reporting Persons I.R.S. Identification Nos. of above persons (entities only). VECTOR LATER-STAGE EQUITY FUND II (QP), L.P. - ------------------------------------------------------------------------------- 2. Check the Appropriate Box if a Member of a Group (See Instructions) (a) /X/ (b) / / - ------------------------------------------------------------------------------- 3. SEC Use Only - ------------------------------------------------------------------------------- 4. Citizenship or Place of Organization DELAWARE - ------------------------------------------------------------------------------- Number of Shares 5. Sole Voting Power Beneficially Owned by Each Reporting Person 0 With ---------------------------------------------------- 6. Shared Voting Power 890,789 ---------------------------------------------------- 7. Sole Dispositive Power 0 ---------------------------------------------------- 8. Shared Dispositive Power 890,789 - ------------------------------------------------------------------------------- 9. Aggregate Amount Beneficially Owned by Each Reporting Person 890,789 - ------------------------------------------------------------------------------- 10. Check if the Aggregate Amount in Row (9) Excludes Certain Shares (See Instructions) / / - ------------------------------------------------------------------------------- 11. Percent of Class Represented by Amount in Row (9) 4.7% - ------------------------------------------------------------------------------- 12. Type of Reporting Person (See Instructions) PN - ------------------------------------------------------------------------------- CUSIP No. 253827109 -------------- - ------------------------------------------------------------------------------- 1. Names of Reporting Persons I.R.S. Identification Nos. of above persons (entities only). VECTOR FUND MANAGEMENT II, L.L.C. - ------------------------------------------------------------------------------- 2. Check the Appropriate Box if a Member of a Group (See Instructions) (a) /X/ (b) / / - ------------------------------------------------------------------------------- 3. SEC Use Only - ------------------------------------------------------------------------------- 4. Citizenship or Place of Organization DELAWARE - ------------------------------------------------------------------------------- Number of Shares 5. Sole Voting Power Beneficially Owned by Each Reporting Person 0 With ---------------------------------------------------- 6. Shared Voting Power 1,187,718 ---------------------------------------------------- 7. Sole Dispositive Power 0 ---------------------------------------------------- 8. Shared Dispositive Power 1,187,718 - ------------------------------------------------------------------------------- 9. Aggregate Amount Beneficially Owned by Each Reporting Person 1,187,718 - ------------------------------------------------------------------------------- 10. Check if the Aggregate Amount in Row (9) Excludes Certain Shares (See Instructions) / / - ------------------------------------------------------------------------------- 11. Percent of Class Represented by Amount in Row (9) 6.3% - ------------------------------------------------------------------------------- 12. Type of Reporting Person (See Instructions) PN - ------------------------------------------------------------------------------- CUSIP No. 253827109 -------------- - ------------------------------------------------------------------------------- 1. Names of Reporting Persons I.R.S. Identification Nos. of above persons (entities only). PALIVACINNI PARTNERS, L.L.C. - ------------------------------------------------------------------------------- 2. Check the Appropriate Box if a Member of a Group (See Instructions) (a) /X/ (b) / / - ------------------------------------------------------------------------------- 3. SEC Use Only - ------------------------------------------------------------------------------- 4. Citizenship or Place of Organization DELAWARE - ------------------------------------------------------------------------------- Number of Shares 5. Sole Voting Power Beneficially Owned by Each Reporting Person 28,835 With ---------------------------------------------------- 6. Shared Voting Power 0 ---------------------------------------------------- 7. Sole Dispositive Power 28,835 ---------------------------------------------------- 8. Shared Dispositive Power 0 - ------------------------------------------------------------------------------- 9. Aggregate Amount Beneficially Owned by Each Reporting Person 28,835 - ------------------------------------------------------------------------------- 10. Check if the Aggregate Amount in Row (9) Excludes Certain Shares (See Instructions) / / - ------------------------------------------------------------------------------- 11. Percent of Class Represented by Amount in Row (9) 0.2% - ------------------------------------------------------------------------------- 12. Type of Reporting Person (See Instructions) PN - ------------------------------------------------------------------------------- CUSIP No. 253827109 -------------- - ------------------------------------------------------------------------------- 1. Names of Reporting Persons I.R.S. Identification Nos. of above persons (entities only). D. THEODORE BERGHORST - ------------------------------------------------------------------------------- 2. Check the Appropriate Box if a Member of a Group (See Instructions) (a) /X/ (b) / / - ------------------------------------------------------------------------------- 3. SEC Use Only - ------------------------------------------------------------------------------- 4. Citizenship or Place of Organization UNITED STATES OF AMERICA - ------------------------------------------------------------------------------- Number of Shares 5. Sole Voting Power Beneficially Owned by Each Reporting Person 61,780 With ---------------------------------------------------- 6. Shared Voting Power 2,150,810 ---------------------------------------------------- 7. Sole Dispositive Power 61,780 ---------------------------------------------------- 8. Shared Dispositive Power 2,150,810 - ------------------------------------------------------------------------------- 9. Aggregate Amount Beneficially Owned by Each Reporting Person 2,211,590 - ------------------------------------------------------------------------------- 10. Check if the Aggregate Amount in Row (9) Excludes Certain Shares (See Instructions) / / - ------------------------------------------------------------------------------- 11. Percent of Class Represented by Amount in Row (9) 11.8% - ------------------------------------------------------------------------------- 12. Type of Reporting Person (See Instructions) IN - ------------------------------------------------------------------------------- CUSIP No. 253827109 -------------- - ------------------------------------------------------------------------------- 1. Names of Reporting Persons I.R.S. Identification Nos. of above persons (entities only). DEBORAH H. BERGHORST TTEE FBO BERGHORST 1998 DYNASTIC TRUST - ------------------------------------------------------------------------------- 2. Check the Appropriate Box if a Member of a Group (See Instructions) (a) /X/ (b) / / - ------------------------------------------------------------------------------- 3. SEC Use Only - ------------------------------------------------------------------------------- 4. Citizenship or Place of Organization DELAWARE - ------------------------------------------------------------------------------- Number of Shares 5. Sole Voting Power Beneficially Owned by Each Reporting Person 60,780 With ---------------------------------------------------- 6. Shared Voting Power 0 ---------------------------------------------------- 7. Sole Dispositive Power 60,780 ---------------------------------------------------- 8. Shared Dispositive Power 0 - ------------------------------------------------------------------------------- 9. Aggregate Amount Beneficially Owned by Each Reporting Person 60,780 - ------------------------------------------------------------------------------- 10. Check if the Aggregate Amount in Row (9) Excludes Certain Shares (See Instructions) / / - ------------------------------------------------------------------------------- 11. Percent of Class Represented by Amount in Row (9) 0.3% - ------------------------------------------------------------------------------- 12. Type of Reporting Person (See Instructions) OO - ------------------------------------------------------------------------------- CUSIP No. 253827109 -------------- - ------------------------------------------------------------------------------- 1. Names of Reporting Persons I.R.S. Identification Nos. of above persons (entities only). PETER F. DRAKE - ------------------------------------------------------------------------------- 2. Check the Appropriate Box if a Member of a Group (See Instructions) (a) /X/ (b) / / - ------------------------------------------------------------------------------- 3. SEC Use Only - ------------------------------------------------------------------------------- 4. Citizenship or Place of Organization UNITED STATES OF AMERICA - ------------------------------------------------------------------------------- Number of Shares 5. Sole Voting Power Beneficially Owned by Each Reporting Person 42,892 With ---------------------------------------------------- 6. Shared Voting Power 2,131,922 ---------------------------------------------------- 7. Sole Dispositive Power 42,892 ---------------------------------------------------- 8. Shared Dispositive Power 2,131,922 - ------------------------------------------------------------------------------- 9. Aggregate Amount Beneficially Owned by Each Reporting Person 2,131,922 - ------------------------------------------------------------------------------- 10. Check if the Aggregate Amount in Row (9) Excludes Certain Shares (See Instructions) / / - ------------------------------------------------------------------------------- 11. Percent of Class Represented by Amount in Row (9) 11.3% - ------------------------------------------------------------------------------- 12. Type of Reporting Person (See Instructions) IN - ------------------------------------------------------------------------------- CUSIP No. 253827109 -------------- - ------------------------------------------------------------------------------- 1. Names of Reporting Persons I.R.S. Identification Nos. of above persons (entities only). THOMAS C. DORN - ------------------------------------------------------------------------------- 2. Check the Appropriate Box if a Member of a Group (See Instructions) (a) /X/ (b) / / - ------------------------------------------------------------------------------- 3. SEC Use Only - ------------------------------------------------------------------------------- 4. Citizenship or Place of Organization UNITED STATES OF AMERICA - ------------------------------------------------------------------------------- Number of Shares 5. Sole Voting Power Beneficially Owned by Each Reporting Person 4,000 With ---------------------------------------------------- 6. Shared Voting Power 0 ---------------------------------------------------- 7. Sole Dispositive Power 4,000 ---------------------------------------------------- 8. Shared Dispositive Power 0 - ------------------------------------------------------------------------------- 9. Aggregate Amount Beneficially Owned by Each Reporting Person 4,000 - ------------------------------------------------------------------------------- 10. Check if the Aggregate Amount in Row (9) Excludes Certain Shares (See Instructions) / / - ------------------------------------------------------------------------------- 11. Percent of Class Represented by Amount in Row (9) 0.0% - ------------------------------------------------------------------------------- 12. Type of Reporting Person (See Instructions) IN - ------------------------------------------------------------------------------- ITEM 1. (a) Name of Issuer DIGIRAD CORPORATION -------------------------------------------------------------------- (b) Address of Issuer's Principal Executive Offices 13950 STOWE DRIVE, POWAY, CA 92064 -------------------------------------------------------------------- ITEM 2. (a) Name of Person Filing THIS SCHEDULE 13G IS BEING JOINTLY FILED BY EACH OF THE FOLLOWING PERSONS PURSUANT TO RULE 13-d(1) (k) PROMULGATED BY THE SECURITIES AND EXCHANGE COMMISSION PURSUANT TO SECTION 13 OF THE SECURITIES AND EXCHANGE ACT OF 1934, AS AMENDED (THE "ACT"): (1) VECTOR LATER-STAGE EQUITY FUND, L.P. ("VLSEF"); (2) VECTOR FUND MANAGEMENT, L.P. ("VFM"); (3) VECTOR LATER-STAGE EQUITY FUND II, L.P. ("VLSEF II"); (4) VECTOR LATER-STAGE EQUITY FUND II (QP), L.P.("VLSEF II QP"); (5) VECTOR FUND MANAGEMENT II, L.L.C. ("VFM II"); (6) PALIVACINNI PARTNERS, L.L.C.; (7) D. THEODORE BERGHORST; (8) DEBORAH BERGHORST TTEE FBO BERGHORST 1998 DYNASTIC TRUST ("TRUST"); (9) PETER F. DRAKE; (10) THOMAS C. DORN. EACH OF THE FOREGOING IS HEREINAFTER INDIVIDUALLY REFERRED TO AS A "REPORTING PERSON" AND COLLECTIVELY AS THE "REPORTING PERSONS". THE REPORTING ERSONS HAVE ENTERED INTO A JOINT FILING AGREEMENT, A COPY OF WHICH IS FILED WITH THIS SCHEDULE 13G AS EXHIBIT A, PURSUANT TO WHICH THE REPORTING PERSONS HAVE AGREED TO FILE THIS STATEMENT JOINTLY IN ACCORDANCE WITH THE PROVISIONS OF RULE 13d-1 (k) (1) UNDER THE ACT. THE REPORTING PERSONS MAY BE DEEMED TO CONSTITUTE A "GROUP" FOR PURPOSES OF SECTION 13(d) (3) OF THE ACT. THE REPORTING PERSONS EXPRESSLY DISCLAIM THAT THEY HAVE AGREED TO ACT AS A GROUP OTHER THAN AS DESCRIBED IN THIS SCHEDULE 13G. -------------------------------------------------------------------- (b) Address of Principal Business Office or, if none, Residence THE ADDRESS OF THE PRINCIPAL BUSINESS OFFICE OF EACH OF THE REPORTING PERSONS IS 1751 LAKE COOK ROAD, SUITE 350, DEERFIELD, ILLINOIS 60015. -------------------------------------------------------------------- (c) Citizenship VLSEF, VFM, VLSEF II, VLSEF QP, VFM II, PALIVACINNI PARTNERS, L.L.C. AND THE TRUST ARE ALL REPORTING PERSONS ORGANIZED UNDER THE LAWS OF THE STATE OF DELAWARE. D. THEODORE BERGHORST THOMAS C. DORN AND PETER F. DRAKE ARE REPORTING PERSONS WHO ARE CITIZENS OF THE UNITED STATES OF AMERICA. -------------------------------------------------------------------- (d) Title of Class of Securities COMMON STOCK, PER VALUE $0.001 PER SHARE -------------------------------------------------------------------- (e) CUSIP Number 253827109 -------------------------------------------------------------------- ITEM 3. IF THIS STATEMENT IS FILED PURSUANT TO SECTIONS 240.13d-1(b) or 240.13d-2(b) or (c), CHECK WHETHER THE PERSON FILING IS A: (a) / / Broker or dealer registered under section 15 of the Act (15 U.S.C. 78o). (b) / / Bank as defined in section 3(a)(6) of the Act (15 U.S.C. 78c). (c) / / Insurance company as defined in section 3(a)(19) of the Act (15 U.S.C. 78c). (d) / / Investment company registered under section 8 of the Investment Company Act of 1940 (15 U.S.C. 80a-8). (e) / / An investment adviser in accordance with Section 240.13d-1(b)(1)(ii)(E); (f) / / An employee benefit plan or endowment fund in accordance with Section 240.13d-1(b)(1)(ii)(F); (g) / / A parent holding company or control person in accordance with Section 240.13d-1(b)(1)(ii)(G); (h) / / A savings association as defined in Section 3(b) of the Federal Deposit Insurance Act (12 U.S.C. 1813); (i) / / A church plan that is excluded from the definition of an investment company under section 3(c)(14) of the Investment Company Act of 1940 (15 U.S.C. 80a-3); (j) / / Group, in accordance with Section 240.13d-1(b)(1)(ii)(J). ITEM 4. OWNERSHIP Provide the following information regarding the aggregate number and percentage of the class of securities of the issuer identified in Item 1. PURSUANT TO RULE 13d-4 OF THE ACT, THE REPORTING PERSONS EXPRESSLY DECLARE THAT THE FILING OF THIS STATEMENT SHALL NOT BE CONSTRUED AS AN ADMISSION THAT ANY SUCH PERSON IS, FOR THE PURPOSES OF SECTION 13(d) AND/OR SECTION 13(g) OF THE ACT, THE BENEFICIAL OWNER OF ANY SECURITIES COVERED BY THIS STATEMENT. ALL OWNERSHIP PERCENTAGES OF THE SECURITIES REPORTED HEREIN ARE BASED UPON 18,785,864 SHARES OF COMMON STOCK OUTSTANDING AS OF OCTOBER 24, 2006, AS DISCLOSED IN THE COMPANY'S QUARTERLY REPORT FILED ON FORM 10-Q WITH THE SECURITIES AND EXCHANGE COMMISSION ON OCTOBER 31, 2006 FOR THE FISCAL QUARTER ENDED SEPTEMBER 30, 2006. VLSEF (a) Amount beneficially owned: 901,312 -------------------------------------------------------------------- (b) Percent of Class: 4.8% -------------------------------------------------------------------- (c) Number of shares as to which the person has: (i) Sole power to vote or to direct the vote 0 ------------------------------------------------------------- (ii) Shared power to vote or to direct the vote 901,312 ------------------------------------------------------------- (iii) Sole power to dispose or to direct the disposition of 0 ------------------------------------------------------------- (iv) Shared power to dispose or to direct the disposition of 901,312 ------------------------------------------------------------- ITEM 4. OWNERSHIP (CONT.) Provide the following information regarding the aggregate number and percentage of the class of securities of the issuer identified in Item 1. VFM (a) Amount beneficially owned: DISPOSITIVE AND VOTING POWER OF SECURITIES OVER WHICH VLSEF HAS VOTING AND DISPOSITIVE POWER IS SHARED BY VFM, THE GENERAL PARTNER OF VLSEF, BY A COMMITTEE OF LIMITED PARTNERS OF VLSEF. FOR PURPOSES OF RULE 13d-3 OF THE ACT, VFM MAY BE DEEMED TO HAVE SHARED VOTING AND DISPOSITIVE POWER WITH RESPECT TO THE 901,312 SHARES OF COMMON STOCK OVER WHICH VLSEF HAS VOTING AND DISPOSITIVE POWER. -------------------------------------------------------------------- (b) Percent of Class: 4.8% -------------------------------------------------------------------- (c) Number of shares as to which the person has: (i) Sole power to vote or to direct the vote 0 ------------------------------------------------------------- (ii) Shared power to vote or to direct the vote 901,312 ------------------------------------------------------------- (iii) Sole power to dispose or to direct the disposition of 0 ------------------------------------------------------------- (iv) Shared power to dispose or to direct the disposition of 901,312 ------------------------------------------------------------- ITEM 4. OWNERSHIP (CONT.) Provide the following information regarding the aggregate number and percentage of the class of securities of the issuer identified in Item 1. VLSEF II (a) Amount beneficially owned: 296,929 -------------------------------------------------------------------- (b) Percent of Class: 1.6% -------------------------------------------------------------------- (c) Number of shares as to which the person has: (i) Sole power to vote or to direct the vote 0 ------------------------------------------------------------- (ii) Shared power to vote or to direct the vote 296,929 ------------------------------------------------------------- (iii) Sole power to dispose or to direct the disposition of 0 ------------------------------------------------------------- (iv) Shared power to dispose or to direct the disposition of 296,929 ------------------------------------------------------------- ITEM 4. OWNERSHIP (CONT.) Provide the following information regarding the aggregate number and percentage of the class of securities of the issuer identified in Item 1. VLSEF II QP (a) Amount beneficially owned: 890,789 -------------------------------------------------------------------- (b) Percent of Class: 4.7% -------------------------------------------------------------------- (c) Number of shares as to which the person has: (i) Sole power to vote or to direct the vote 0 ------------------------------------------------------------- (ii) Shared power to vote or to direct the vote 890,789 ------------------------------------------------------------- (iii) Sole power to dispose or to direct the disposition of 0 ------------------------------------------------------------- (iv) Shared power to dispose or to direct the disposition of 890,789 ------------------------------------------------------------- ITEM 4. OWNERSHIP (CONT.) Provide the following information regarding the aggregate number and percentage of the class of securities of the issuer identified in Item 1. VFM II (a) Amount beneficially owned: DISPOSITIVE AND VOTING POWER OF SECURITIES OVER WHICH VLSEF II AND VLSEF II QP HAVE VOTING AND DISPOSITIVE POWER IS SHARED BY VFM II, THE GENERAL PARTNER OF VLSEF II AND VLSEF QP, BY A COMMITTEE OF LIMITED PARTNERS OF VLSEF II AND VLSEF II QP. FOR PURPOSES OF RULE 13d-3 OF THE ACT, VFM II MAY BE DEEMED TO HAVE SHARED VOTING AND DISPOSITIVE POWER WITH RESPECT TO THE 1,187,718 SHARES OF COMMON STOCK OVER WHICH VLSEF II AND VLSEF QP HAVE VOTING AND DISPOSITIVE POWER. -------------------------------------------------------------------- (b) Percent of Class: 6.3% -------------------------------------------------------------------- (c) Number of shares as to which the person has: 1,187,718 -------------------------------------------------------------------- (i) Sole power to vote or to direct the vote 0 ------------------------------------------------------------- (ii) Shared power to vote or to direct the vote 1,187,718 ------------------------------------------------------------- (iii) Sole power to dispose or to direct the disposition of 0 ------------------------------------------------------------- (iv) Shared power to dispose or to direct the disposition of 1,187,718 ------------------------------------------------------------- ITEM 4. OWNERSHIP (CONT.) Provide the following information regarding the aggregate number and percentage of the class of securities of the issuer identified in Item 1. Palivacinni Partners, L.L.C. (a) Amount beneficially owned: PALIVACINNI PARTNERS, L.L.C. IS A DIRECT BENEFICIAL OWNER OF AND HAS SOLE DISPOSITIVE AND VOTING POWER OVER 28,835 SHARES OF COMMON STOCK. PALVIACINNI PARTNERS, L.L.C. DISCLAIMS BENEFICIAL OWNERSHIP OF ANY OTHER SECURITIES COVERED BY THIS STATEMENT. -------------------------------------------------------------------- (b) Percent of Class: 0.2% -------------------------------------------------------------------- (c) Number of shares as to which the person has: 28,835 -------------------------------------------------------------------- (i) Sole power to vote or to direct the vote 28,835 ------------------------------------------------------------- (ii) Shared power to vote or to direct the vote 0 ------------------------------------------------------------- (iii) Sole power to dispose or to direct the disposition of 28,835 ------------------------------------------------------------- (iv) Shared power to dispose or to direct the disposition of 0 ------------------------------------------------------------- ITEM 4. OWNERSHIP (CONT.) Provide the following information regarding the aggregate number and percentage of the class of securities of the issuer identified in Item 1. D. Theodore Berghorst (a) Amount beneficially owned: D. THEODORE BERGHORST IS A DIRECT BENEFICIAL OWNER OF AND HAS SOLE DISPOSITIVE AND VOTING POWER OVER 61,780 SHARES OF COMMON STOCK. ALSO, BY VIRTUE OF D. THEODORE BERGHORST BEING AN OFFICER AND DIRECTOR OF VFM AND VFM II (THE GENERAL PARTNERS OF VLSEF, VLSEF II, AND VLSEF II QP) FOR PURPOSES OF RULE 13d-3 OF THE ACT, HE MAY BE DEEMED TO BE A BENEFICIAL OWNER OF THE 2,089,030 SHARES OF COMMON STOCK BENEFICIALLY OWNED BY VLSEF, VLSEF II, VLSEF II QP,VFM AND VFM II. AS FINANCIAL ADVISOR FOR THE BERGHORST 1998 DYNASTIC TRUST ("THE TRUST"), FOR PURPOSES OF RULE 13d-3 OF THE ACT, HE MAY ALSO BE DEEMED TO BE A BENEFICIAL OWNER OF THE 60,780 SHARES OF COMMON STOCK OWNED BY THE TRUST. D. THEODORE BERGHORST DISCLAIMS BENEFICIAL OWNERSHIP OF ANY OTHER SECURITIES COVERED BY THIS STATEMENT. -------------------------------------------------------------------- (b) Percent of Class: 11.8% -------------------------------------------------------------------- (c) Number of shares as to which the person has: 61,780 -------------------------------------------------------------------- (i) Sole power to vote or to direct the vote 61,780 ------------------------------------------------------------- (ii) Shared power to vote or to direct the vote 2,150,810 ------------------------------------------------------------- (iii) Sole power to dispose or to direct the disposition of 61,780 ------------------------------------------------------------- (iv) Shared power to dispose or to direct the disposition of 2,150,810 ------------------------------------------------------------- ITEM 4. OWNERSHIP (CONT.) Provide the following information regarding the aggregate number and percentage of the class of securities of the issuer identified in Item 1. Deborah Berghorst TTEE FBO Berghorst 1998 Dynastic Trust ("the Trust") (a) Amount beneficially owned: THE TRUST IS A DIRECT BENEFICIAL OWNER OF AND HAS SOLE DISPOSITIVE AND VOTING POWER OVER 60,780 SHARES OF COMMON STOCK. THE TRUST DISCLAIMS BENEFICIAL OWNERSHIP OF ANY OTHER SECURITIES COVERED BY THIS STATEMENT. -------------------------------------------------------------------- (b) Percent of Class: 0.3% -------------------------------------------------------------------- (c) Number of shares as to which the person has: 60,780 -------------------------------------------------------------------- (i) Sole power to vote or to direct the vote 60,780 ------------------------------------------------------------- (ii) Shared power to vote or to direct the vote 0 ------------------------------------------------------------- (iii) Sole power to dispose or to direct the disposition of 60,780 ------------------------------------------------------------- (iv) Shared power to dispose or to direct the disposition of 0 ------------------------------------------------------------- ITEM 4. OWNERSHIP (CONT.) Provide the following information regarding the aggregate number and percentage of the class of securities of the issuer identified in Item 1. Peter F. Drake (a) Amount beneficially owned: PETER F. DRAKE IS A DIRECT BENEFICIAL OWNER OF AND HAS SOLE DISPOSITIVE AND VOTING POWER OVER 42,982 SHARES OF COMMON STOCK. PETER F. DRAKE BEING A DIRECTOR OF VFM AND VFM II (THE GENERAL PARTNERS OF VLSEF, VLSEF II AND VLSEF II QP), FOR PURPOSES OF RULE 13d-3 OF THE ACT, HE MAY BE A BENEFICIAL OWNER OF THE 2,089,030 SHARES OF COMMON STOCK BENEFICIALLY OWNED BY VLSEF, VLSEF II, VLSEF II QP, VFM AND VFM II. PETER F. DRAKE DISCLAIMS BENEFICIAL OWNERSHIP OF ANY OTHER SECURITIES COVERED BY THIS STATEMENT. -------------------------------------------------------------------- (b) Percent of Class: 11.3% -------------------------------------------------------------------- (c) Number of shares as to which the person has: (i) Sole power to vote or to direct the vote 42,982 ------------------------------------------------------------- (ii) Shared power to vote or to direct the vote 2,131,922 ------------------------------------------------------------- (iii) Sole power to dispose or to direct the disposition of 42,982 ------------------------------------------------------------- (iv) Shared power to dispose or to direct the disposition of 2,131,922 ------------------------------------------------------------- ITEM 4. OWNERSHIP (CONT.) Provide the following information regarding the aggregate number and percentage of the class of securities of the issuer identified in Item 1. Thomas C. Dorn (a) Amount beneficially owned: 4,000 -------------------------------------------------------------------- (b) Percent of Class: 0.0% -------------------------------------------------------------------- (c) Number of shares as to which the person has: 4,000 -------------------------------------------------------------------- (i) Sole power to vote or to direct the vote 4,000 ------------------------------------------------------------- (ii) Shared power to vote or to direct the vote 0 ------------------------------------------------------------- (iii) Sole power to dispose or to direct the disposition of 4,000 ------------------------------------------------------------- (iv) Shared power to dispose or to direct the disposition of 0 ------------------------------------------------------------- ITEM 5. OWNERSHIP OF FIVE PERCENT OR LESS OF A CLASS If this statement is being filed to report the fact that as of the date hereof the reporting person has ceased to be the beneficial owner of more than five percent of the class of securities, check the following / /. ITEM 6. OWNERSHIP OF MORE THAN FIVE PERCENT ON BEHALF OF ANOTHER PERSON SEE RESPONSE TO ITEM 4 ITEM 7. IDENTIFICATION AND CLASSIFICATION OF THE SUBSIDIARY WHICH ACQUIRED THE SECURITY BEING REPORTED ON BY THE PARENT HOLDING COMPANY OR CONTROL PERSON NOT APPLICABLE ITEM 8. IDENTIFICATION AND CLASSIFICATION OF MEMBERS OF THE GROUP NOT APPLICABLE ITEM 9. NOTICE OF DISSOLUTION OF GROUP NOT APPLICABLE ITEM 10. CERTIFICATION NOT APPLICABLE SIGNATURE After reasonable inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true, complete and correct. Date: MARCH 8, 2007 VECTOR LATER-STAGE EQUITY FUND, L.P. BY: VECTOR FUND MANAGEMENT, L.P. ITS: GENERAL PARTNER BY: VECTOR ASSET MANAGEMENT, INC. ITS: MANAGING MEMBER BY: /s/ THOMAS C. DORN ----------------------------- CHIEF FINANCIAL OFFICER VECTOR FUND MANAGEMENT, L.P. BY: VECTOR ASSET MANAGEMENT, INC. ITS: MANAGING MEMBER BY: /s/ THOMAS C. DORN ------------------------------ CHIEF FINANCIAL OFFICER VECTOR LATER-STAGE EQUITY FUND II, L.P. BY: VECTOR FUND MANAGEMENT II, L.L.C. ITS: GENERAL PARTNER BY: VECTOR ASSET MANAGEMENT, INC. ITS: MANAGING MEMBER BY: /s/ THOMAS C. DORN ----------------------------- CHIEF FINANCIAL OFFICER VECTOR LATER-STAGE EQUITY FUND II (QP), L.P. BY: VECTOR FUND MANAGEMENT II, L.L.C. ITS: GENERAL PARTNER BY: VECTOR ASSET MANAGEMENT, INC. ITS: MANAGING MEMBER BY: /s/ THOMAS C. DORN ------------------------------ CHIEF FINANCIAL OFFICER VECTOR FUND MANAGEMENT II, L.L.C. BY: VECTOR ASSET MANAGEMENT, INC. ITS: MANAGING MEMBER BY: /s/ THOMAS C. DORN ------------------------------ CHIEF FINANCIAL OFFICER PALIVACINNI PARTNERS, L.L.C. BY: /s/ DOUGLAS B. REED ----------------------------- DOUGLAS B. REED, MANAGING MEMBER /s/ D. THEODORE BERGHORST - --------------------------------- D. THEODORE BERGHORST DEBORAH H. BERGHORST TTEE FBO BERGHORST 1998 DYNASTIC TRUST BY: /s/ D. THEODORE BERGHORST ------------------------------------------------------ D. THEODORE BERGHORST, FINANCIAL ADVISOR /s/ PETER F. DRAKE - ------------------------------- PETER F. DRAKE /s/ THOMAS C. DORN - ------------------------------- THOMAS C. DORN
EXHIBIT A (ADDITIONAL SIGNATURE PAGE TO JOINT FILING AGREEMENT) AGREEMENT REGARDING THE JOINT FILING OF SCHEDULE 13G THE UNDERSIGNED HEREBY AGREE AS FOLLOWS: (1) EACH OF THEM IS INDIVIDUALLY ELIGIBLE TO USE THE SCHEDULE 13G TO WHICH THIS EXHIBIT IS ATTACHED, AND SUCH SCHEDULE 13G IS FILED ON BEHALF OF EACH OF THEM; AND (2) EACH OF THEM IS RESPONSIBLE FOR THE TIMELY FILING OF SUCH SCHEDULE 13G AND ANY AMENDMENTS THERETO, AND FOR THE COMPLETENESS AND ACCURACY OF THE INFORMATION CONCERNING SUCH PERSON CONTAINED HEREIN; BUT NONE OF THEM IS RESPONSIBLE FOR THE COMPLETENESS OR ACCURACY OF THE INFORMATION CONCERNING THE OTHER PERSONS MAKING THE FILING, UNLESS SUCH PERSON KNOWS OR HAS REASON TO BELIEVE THAT SUCH INFORMATION IS INACCURATE. DATE: MARCH 8, 2007 VECTOR LATER-STAGE EQUITY FUND, L.P. BY: VECTOR FUND MANAGEMENT, L.P. ITS: GENERAL PARTNER BY: VECTOR ASSET MANAGEMENT, INC. ITS: MANAGING MEMBER BY: /s/ THOMAS C. DORN ----------------------------- CHIEF FINANCIAL OFFICER VECTOR FUND MANAGEMENT, L.P. BY: VECTOR ASSET MANAGEMENT, INC. ITS: MANAGING MEMBER BY: /s/ THOMAS C. DORN ------------------------------ CHIEF FINANCIAL OFFICER VECTOR LATER-STAGE EQUITY FUND II, L.P. BY: VECTOR FUND MANAGEMENT II, L.L.C. ITS: GENERAL PARTNER BY: VECTOR ASSET MANAGEMENT, INC. ITS: MANAGING MEMBER BY: /s/ THOMAS C. DORN ----------------------------- CHIEF FINANCIAL OFFICER VECTOR LATER-STAGE EQUITY FUND II (QP), L.P. BY: VECTOR FUND MANAGEMENT II, L.L.C. ITS: GENERAL PARTNER BY: VECTOR ASSET MANAGEMENT, INC. ITS: MANAGING MEMBER BY: /s/ THOMAS C. DORN ------------------------------ CHIEF FINANCIAL OFFICER VECTOR FUND MANAGEMENT II, L.L.C. BY: VECTOR ASSET MANAGEMENT, INC. ITS: MANAGING MEMBER BY: /s/ THOMAS C. DORN ------------------------------ CHIEF FINANCIAL OFFICER PALIVACINNI PARTNERS, L.L.C. BY: /s/ DOUGLAS B. REED ----------------------------- DOUGLAS B. REED, MANAGING MEMBER /s/ D. THEODORE BERGHORST - --------------------------------- D. THEODORE BERGHORST DEBORAH H. BERGHORST TTEE FBO BERGHORST 1998 DYNASTIC TRUST BY: /s/ D. THEODORE BERGHORST ------------------------------------------------------ D. THEODORE BERGHORST, FINANCIAL ADVISOR /s/ PETER F. DRAKE - ------------------------------- PETER F. DRAKE /s/ THOMAS C. DORN - ------------------------------- THOMAS C. DORN