UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549

                                  Schedule 13G

                    Under the Securities Exchange Act of 1934

                                (Amendment No. 9)


                                 Surmodics, Inc.
- --------------------------------------------------------------------------------
                                (Name of Issuer)


                          Common Stock, $.05 par value
- --------------------------------------------------------------------------------
                         (Title of Class of Securities)


                                   867773 10 0
- --------------------------------------------------------------------------------
                                 (CUSIP Number)


                                December 31, 2007
- --------------------------------------------------------------------------------
             (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)


Page 2 of 4 CUSIP NO. 868873 10 0 - -------------------------------------------------------------------------------- 1 NAME OF REPORTING PERSON I.R.S. IDENTIFICATION NOS. OF ABOVE PERSON (ENTITIES ONLY). David A. Koch - -------------------------------------------------------------------------------- 2 CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (a) |_| (b) |_| - -------------------------------------------------------------------------------- 3 SEC USE ONLY - -------------------------------------------------------------------------------- 4 CITIZENSHIP OR PLACE OF ORGANIZATION USA - -------------------------------------------------------------------------------- 5 SOLE VOTING POWER 839,583 (includes 24,000 shares which may be purchased upon the exercise of options) ----------------------------------------------------------------- NUMBER OF 6 SHARED VOTING POWER SHARES BENEFICIALLY 125,000 OWNED BY ----------------------------------------------------------------- EACH 7 SOLE DISPOSITIVE POWER REPORTING PERSON 839,583 (includes 24,000 shares which may be purchased upon the exercise of options) WITH: ----------------------------------------------------------------- 8 SHARED DISPOSITIVE POWER 125,000 - -------------------------------------------------------------------------------- 9 AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 964,583 (includes 24,000 shares which may be purchased upon the exercise of options) - -------------------------------------------------------------------------------- 10 CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES (SEE INSTRUCTIONS) |_| - -------------------------------------------------------------------------------- 11 PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9) 5.28% - -------------------------------------------------------------------------------- 12 TYPE OF REPORTING PERSON IN - --------------------------------------------------------------------------------

Page 3 of 4 Item 1(a). Name of issuer: Surmodics, Inc. Item 1(b). Address of issuer's principal executive offices: 9924 West 74th Street Eden Prairie, MN 55344-3523 Item 2(a). Names of person filing: David A. Koch Item 2(b). Address of principal business office: 505 N Highway 169 Suite 595 Plymouth, MN 55441 Item 2(c). Citizenship: USA Item 2(d). Title of class of securities: Common Stock, $.05 par value Item 2(e). CUSIP No.: 868873 10 0 Item 3. If this statement is filed pursuant to Secs. 240.13d-1(b) or 240.13d-2(b) or (c), check whether the person filing is a: Not applicable Item 4. Ownership (a) Amount beneficially owned: 964,583 (includes 24,000 shares which may be purchased upon the exercise of options) (b) Percent of class: 5.28% (c) Number of shares as to which the person has: (i) Sole power to vote or to direct the vote: 839,583 (incudes 24,000 shares which may be purchased upon exercise of options) (ii) Shared power to vote or to direct the vote: 125,000 (iii) Sole power to dispose or to direct the disposition of: 839,583 (incudes 24,000 shares which may be purchased upon exercise of options) (iv) Shared power to dispose or to direct the disposition of: 125,000 Item 5. Ownership of 5 percent or Less of a Class: Not applicable. Item 6. Ownership of More than 5 Percent on Behalf of Another Person: Not applicable. 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. Certifications Not applicable.

Page 4 of 4 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. Dated: March 12, 2008 /s/ David A. Koch ------------------------------------- Signature David A. Koch ------------------------------------- Name/Title