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