<Page> UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 13F FORM 13F COVER PAGE Report for the Calendar Year or Quarter Ended: March 31, 2013 ----------------------- Check Here if Amendment / /; Amendment Number: --------- This Amendment (Check only one.): / / is a restatement. / / adds new holdings entries. Institutional Investment Manager Filing this Report: Name: Oaktop Capital Management II, L.P. ---------------------------------- Address: One Main Street, Suite 202 ---------------------------------- Chatham, New Jersey 07928 ---------------------------------- Form 13F File Number: --------------------- The institutional investment manager filing this report and the person by whom it is signed hereby represent that the person signing the report is authorized to submit it, that all information contained herein is true, correct and complete, and that it is understood that all required items, statements, schedules, lists, and tables, are considered integral parts of this form. Person Signing this Report on Behalf of Reporting Manager: Name: Robert F. Moriarty ------------------------------- Title: Chief Compliance Officer ------------------------------- Phone: 973-701-2170 ------------------------------- Signature, Place, and Date of Signing: /s/ Robert F. Moriarty Chatham, New Jersey May 14, 2013 ----------------------------- ------------------- ----------------- [Signature] [City, State] [Date] Report Type (Check only one.): /X/ 13F HOLDINGS REPORT. (Check here if all holdings of this reporting manager are reported in this report.) / / 13F NOTICE. (Check here if no holdings reported are in this report, and all holdings are reported by other reporting manager(s).) / / 13F COMBINATION REPORT. (Check here if a portion of the holdings for this reporting manager are reported in this report and a portion are reported by other reporting manager(s).) <Page> FORM 13F SUMMARY PAGE Report Summary: Number of Other Included Managers: 0 -------------------- Form 13F Information Table Entry Total: 20 -------------------- Form 13F Information Table Value Total: 343,894 -------------------- (thousands) List of Other Included Managers: Provide a numbered list of the name(s) and Form 13F file number(s) of all institutional investment managers with respect to which this report is filed, other than the manager filing this report. NONE <Page> <Table> <Caption> VOTING AUTHORITY TITLE OF VALUE SHRS OR SH/ PUT/ INVESTMENT OTHER ---------------------- NAME OF ISSUER CLASS CUSIP (X$1000) PRN AMT PRN CALL DISCRETION MANAGER SOLE SHARED NONE --------------------------------------------------------------------------------------------------------------------------------- ALTERA CORP Common Stock 021441100 20,102 566,900 SH SOLE 566,900 ANIKA THERAPEUTICS INC Common Stock 035255108 182 12,500 SH SOLE 12,500 BANKRATE INC Common Stock 06647F102 3,284 275,000 SH SOLE 275,000 CELGENE CORP Common Stock 151020104 137,906 1,189,772 SH SOLE 1,189,772 CEVA INC Common Stock 157210105 7,579 485,836 SH SOLE 485,836 CISCO SYS INC Common Stock 17275R102 858 41,039 SH SOLE 41,039 DEVON ENERGY CORP NEW Common Stock 25179M103 4,514 80,000 SH SOLE 80,000 E M C CORP MASS Common Stock 268648102 16,684 698,350 SH SOLE 698,350 EGAIN COMMUNICATIONS CORP Common Stock 28225C806 953 110,000 SH SOLE 110,000 ENERNOC INC Common Stock 292764107 2,345 135,000 SH SOLE 135,000 INTEL CORP Common Stock 458140100 721 33,010 SH SOLE 33,010 KLA-TENCOR CORP Common Stock 482480100 19,026 360,750 SH SOLE 360,750 LAM RESEARCH CORP Common Stock 512807108 12,210 294,504 SH SOLE 294,504 MAXIM INTEGRATED PRODS INC Common Stock 57772K101 22,110 677,375 SH SOLE 677,375 MICROS SYS INC Common Stock 594901100 42,208 927,445 SH SOLE 927,445 NEWSTAR FINL INC Common Stock 65251F105 29,863 2,257,204 SH SOLE 2,257,204 OVERSTOCK COM INC DEL Common Stock 690370101 2,847 231,092 SH SOLE 145,647 PETMEDEXPRESS INC Common Stock 716382106 830 61,900 SH SOLE 61,900 PROGRESS SOFTWARE CORP Common Stock 743312100 15,925 697,526 SH SOLE 697,526 VMWARE INC Common Stock 928563402 3,747 47,500 SH SOLE 47,500