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: Petersen, Flynn & Dinsmore, Inc. Address: 200 Homer Avenue Palo Alto, CA 94301 13F File Number: 028-05773 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: Bradford W. Dinsmore Title: President Phone: 650-566-9650 Signature, Place, and Date of Signing: /s/ Bradford W. Dinsmore Palo Alto, CA May 15, 2013 Report Type (Check only one.): [ X] 13F HOLDINGS REPORT. [ ] 13F NOTICE. [ ] 13F COMBINATION REPORT. FORM 13F SUMMARY PAGE Report Summary: Number of Other Included Managers: 0 Form 13F Information Table Entry Total: 62 Form 13F Information Table Value Total: $304,660 (thousands) List of Other Included Managers: Provide a numbered list of the name(s) and Form 13F file number(s) of all institutional managers with respect to which this report is filed, other than the manager filing this report. NONE FORM 13F INFORMATION TABLE VALUE SHARES/ SH/ PUT/ INVSTMT OTHER VOTING AUTHORITY NAME OF ISSUER TITLE OF CLASS CUSIP (x$1000) PRN AMT PRN CALL DSCRETN MANAGERS SOLE SHARED NONE ------------------------------ ---------------- --------- -------- -------- --- ---- ------- ------------ -------- -------- -------- ABBOTT LABS COM 002824100 6947 196679 SH SOLE 196679 0 0 ABBVIE INC COM 00287Y109 7960 195203 SH SOLE 195203 0 0 ALLSTATE CORP COM 020002101 245 5000 SH SOLE 5000 0 0 ALTRIA GROUP INC COM 02209S103 253 7355 SH SOLE 7355 0 0 AMGEN INC COM 031162100 5772 56302 SH SOLE 56302 0 0 APPLE INC COM 037833100 870 1966 SH SOLE 1966 0 0 APTARGROUP INC COM 038336103 9880 172268 SH SOLE 172268 0 0 AT&T INC COM 00206R102 427 11643 SH SOLE 11643 0 0 BP PLC SPONSORED ADR 055622104 481 11351 SH SOLE 11351 0 0 BRISTOL MYERS SQUIBB CO COM 110122108 11213 272228 SH SOLE 272228 0 0 CELGENE CORP COM 151020104 209 1800 SH SOLE 1800 0 0 CHEVRON CORP NEW COM 166764100 1659 13959 SH SOLE 13959 0 0 CHUBB CORP COM 171232101 396 4526 SH SOLE 4526 0 0 CISCO SYS INC COM 17275R102 547 26201 SH SOLE 26201 0 0 CLICKSOFTWARE TECHNOLOGIES L ORD M25082104 5683 706808 SH SOLE 706808 0 0 CONOCOPHILLIPS COM 20825C104 9559 159054 SH SOLE 159054 0 0 CONSOLIDATED EDISON INC COM 209115104 709 11618 SH SOLE 11618 0 0 DIAGEO P L C SPON ADR NEW 25243Q205 626 4975 SH SOLE 4975 0 0 DISNEY WALT CO COM DISNEY 254687106 9475 166812 SH SOLE 166812 0 0 DU PONT E I DE NEMOURS & CO COM 263534109 955 19420 SH SOLE 19420 0 0 ELECTRONIC ARTS INC COM 285512109 4857 274415 SH SOLE 274415 0 0 EMERSON ELEC CO COM 291011104 487 8714 SH SOLE 8714 0 0 EXXON MOBIL CORP COM 30231G102 1031 11442 SH SOLE 11442 0 0 FISERV INC COM 337738108 11033 125573 SH SOLE 125573 0 0 FOREST OIL CORP COM PAR $0.01 346091705 62 11781 SH SOLE 11781 0 0 GALLAGHER ARTHUR J & CO COM 363576109 12637 305913 SH SOLE 305913 0 0 GENERAL ELECTRIC CO COM 369604103 338 14635 SH SOLE 14635 0 0 GILEAD SCIENCES INC COM 375558103 1372 28029 SH SOLE 28029 0 0 HOME DEPOT INC COM 437076102 4002 57350 SH SOLE 57350 0 0 INTEL CORP COM 458140100 236 10795 SH SOLE 10795 0 0 JOHNSON & JOHNSON COM 478160104 11678 143230 SH SOLE 143230 0 0 KIMBERLY CLARK CORP COM 494368103 12679 129402 SH SOLE 129402 0 0 KRAFT FOODS GROUP INC COM 50076Q106 10925 212008 SH SOLE 212008 0 0 LIGAND PHARMACEUTICALS INC COM NEW 53220K504 544 20400 SH SOLE 20400 0 0 MERCK & CO INC NEW COM 58933Y105 291 6581 SH SOLE 6581 0 0 MICROSOFT CORP COM 594918104 10497 366956 SH SOLE 366956 0 0 MOLEX INC CL A 608554200 10332 428345 SH SOLE 428345 0 0 MONDELEZ INTL INC CL A 609207105 2966 96885 SH SOLE 96885 0 0 MORGAN STANLEY ASIA PAC FD I COM 61744U106 5182 320843 SH SOLE 320843 0 0 MOSAIC CO NEW COM 61945C103 8356 140186 SH SOLE 140186 0 0 NORTHEAST UTILS COM 664397106 346 7957 SH SOLE 7957 0 0 PEPSICO INC COM 713448108 11154 140999 SH SOLE 140999 0 0 PFIZER INC COM 717081103 565 19590 SH SOLE 19590 0 0 PHILIP MORRIS INTL INC COM 718172109 244 2629 SH SOLE 2629 0 0 PROCTER & GAMBLE CO COM 742718109 1241 16100 SH SOLE 16100 0 0 QUALCOMM INC COM 747525103 8721 130283 SH SOLE 130283 0 0 RELIANCE STEEL & ALUMINUM CO COM 759509102 8129 114220 SH SOLE 114220 0 0 SCHLUMBERGER LTD COM 806857108 10053 134243 SH SOLE 134243 0 0 SIMPSON MANUFACTURING CO INC COM 829073105 6317 206385 SH SOLE 206385 0 0 SOUTHERN CO COM 842587107 1476 31455 SH SOLE 31455 0 0 STAMPS COM INC COM NEW 852857200 2555 102307 SH SOLE 102307 0 0 TEMPLETON DRAGON FD INC COM 88018T101 5291 189455 SH SOLE 189455 0 0 THE ADT CORPORATION COM 00101J106 10077 205912 SH SOLE 205912 0 0 THERMO FISHER SCIENTIFIC INC COM 883556102 12255 160220 SH SOLE 160220 0 0 UNITED TECHNOLOGIES CORP COM 913017109 215 2305 SH SOLE 2305 0 0 VALIDUS HOLDINGS LTD COM SHS G9319H102 7301 195381 SH SOLE 195381 0 0 VERIZON COMMUNICATIONS INC COM 92343V104 12883 262114 SH SOLE 262114 0 0 VISA INC COM CL A 92826C839 212 1250 SH SOLE 1250 0 0 WASTE MGMT INC DEL COM 94106L109 11076 282476 SH SOLE 282476 0 0 WELLS FARGO & CO NEW COM 949746101 463 12523 SH SOLE 12523 0 0 WGL HLDGS INC COM 92924F106 2974 67435 SH SOLE 67435 0 0 WISDOMTREE TRUST EMERG MKTS ETF 97717W315 7741 140595 SH SOLE 140595 0 0