UNITED STATES
                      SECURITIES AND EXCHANGE COMMISSION
                              Washington DC 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: [ ] is a restatement.
                [ ] adds new holdings entries.

Institutional Investment Manager Filing this Report:

Name:        First Pacific Advisors, LLC
Address:     11400 West Olympic Blvd.
             Suite 1200
             Los Angeles, CA  90064

Form 13F File Number: 28-12253

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:        J. Richard Atwood
Title:       Chief Operating Officer
Phone:       (310) 996-5458

Signature, Place, and Date of Signing:
J. Richard Atwood                       Los Angeles, CA               05/10/13
------------------------------          --------------------          --------
Signature                               City, State                   Date

Report Type:

[X] 13F HOLDINGS REPORT
[ ] 13F NOTICE
[ ] 13F COMBINATION REPORT


REPORT SUMMARY:
Number of Other Included Managers: 0
Form 13F Information Table Entry Total: 213
Form 13f Information Table value Total: $9,206,098











                                                                  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
------------------------------ ---------------- --------- -------- -------- --- ---- ------- ------------ -------- -------- --------
                                                                                           
ACTUANT CORP CL A              CS               00508X203    21872   714300 SH       Sole     0                               714300
                                                               328    10700 SH       Defined  0                                10700
ALLEGHANY CORPORATION          CS               017175100   113312   286200 SH       Sole     0                               286200
                                                              3771     9523 SH       Defined  0                        8923      600
ALLIANT TECHSYSTEMS INC        CS               018804104     3795    52400 SH       Sole     0                                52400
                                                              4838    66800 SH       Defined  0                       56300    10500
AMERICAN INTL GROUP INC        CS               026874784   200633  5168300 SH       Sole     0                              5168300
                                                             22081   568800 SH       Defined  0                      558000    10800
AMETEK INC.                    CS               031100100      361     8325 SH       Defined  0                                 8325
ANALOG DEVICES INC             CS               032654105   163738  3522000 SH       Sole     0                              3522000
                                                              7104   152800 SH       Defined  0                      147100     5700
ANHEUSER-BUSCH INBEV SPN ADR   CS               03524A108   215068  2160400 SH       Sole     0                              2160400
                                                              5485    55100 SH       Defined  0                       55100
AON PLC                        CS               G0408V102   384326  6249200 SH       Sole     0                              6249200
                                                             39471   641800 SH       Defined  0                      627100    14700
APOLLO GROUP INC CL A          CS               037604105    21955  1262500 SH       Sole     0                              1262500
                                                             28290  1626800 SH       Defined  0                     1436200   190600
ARES COML REAL ESTATE CORP     CS               04013V108     4152   245412 SH       Defined  0                      245412
ARRIS GROUP INC                CS               04270V106    81915  4770800 SH       Sole     0                              4770800
                                                             16749   975500 SH       Defined  0                      841400   134100
ARROW ELECTRONICS INC.         CS               042735100    86139  2120600 SH       Sole     0                              2120600
                                                             88543  2179800 SH       Defined  0                     1865900   313900
ATWOOD OCEANICS INC.           CS               050095108    14564   277206 SH       Sole     0                               277206
                                                             15731   299411 SH       Defined  0                      254911    44500
AVNET INC                      CS               053807103    84418  2332000 SH       Sole     0                              2332000
                                                             97209  2685342 SH       Defined  0                     2300700   384642
AZZ INC                        CS               002474104       34      700 SH       Defined  0                                  700
BAKER HUGHES INC               CS               057224107    19899   428772 SH       Sole     0                               428772
                                                             22614   487255 SH       Defined  0                      405142    82113
BANK  OF NEW YORK MELLON       CS               064058100   125714  4491400 SH       Sole     0                              4491400
                                                              5724   204500 SH       Defined  0                      197000     7500
BANK OF AMERICA CORP           CS               060505104    46299  3801200 SH       Sole     0                              3801200
                                                              2239   183800 SH       Defined  0                      173300    10500
BIO-RAD LABORATORIES, INC.     CS               090572207    37939   301100 SH       Sole     0                               301100
                                                               693     5500 SH       Defined  0                                 5500
CABOT OIL & GAS CORP           CS               127097103     6802   100600 SH       Sole     0                               100600
                                                              7579   112100 SH       Defined  0                       97000    15100
CANADIAN NATURAL RESOURCES     CS               136385101   166321  5176500 SH       Sole     0                              5176500
                                                             15043   468200 SH       Defined  0                      459400     8800
CAREFUSION CORP                CS               14170T101   167756  4794400 SH       Sole     0                              4794400
                                                              7260   207500 SH       Defined  0                      200300     7200
CARMAX INC                     CS               143130102    68851  1651100 SH       Sole     0                              1651100
                                                              1284    30800 SH       Defined  0                                30800
CEC ENTERTAINMENT INC          CS               125137109       39     1200 SH       Defined  0                                 1200
CENTENE CORPORATION            CS               15135B101     6086   138200 SH       Sole     0                               138200
                                                              7694   174700 SH       Defined  0                      153900    20800
CHECK POINT SOFTWARE TECHNOLOG CS               M22465104   107842  2295000 SH       Sole     0                              2295000
                                                              4995   106300 SH       Defined  0                      100500     5800
CIMAREX ENERGY CO              CS               171798101    14032   186000 SH       Sole     0                               186000
                                                             19894   263700 SH       Defined  0                      218900    44800
CISCO SYSTEMS INC              CS               17275R102   229533 10977200 SH       Sole     0                             10977200
                                                             10095   482800 SH       Defined  0                      464200    18600
CIT GROUP INC.                 CS               125581801   119379  2745600 SH       Sole     0                              2745600
                                                             12735   292900 SH       Defined  0                      287500     5400
CITIGROUP INC                  CS               172967424    78805  1781300 SH       Sole     0                              1781300
                                                              3761    85013 SH       Defined  0                       82113     2900
CITIGROUP INC                  CS               172967904      345     7800 SH  CALL Defined  0                        7800
CITIZENS CMNTY BANCORP INC     CS               174903104      797   114160 SH       Defined  0                      114160
CLARCOR INC                    CS               179895107    28060   535700 SH       Sole     0                               535700
                                                               545    10400 SH       Defined  0                                10400
COPART INC.                    CS               217204106    51667  1507200 SH       Sole     0                              1507200
                                                               967    28200 SH       Defined  0                                28200
COVIDIEN PLC ORDS              CS               G2554F113   329139  4851700 SH       Sole     0                              4851700
                                                             33723   497100 SH       Defined  0                      489000     8100
CVS CAREMARK CORP              CS               126650100   374207  6805000 SH       Sole     0                              6805000
                                                             28628   520600 SH       Defined  0                      508600    12000
DEVRY INC                      CS               251893103    32226  1015000 SH       Sole     0                              1015000
                                                             45345  1428200 SH       Defined  0                     1269800   158400
DOLBY LABORATORIES INC         CS               25659T107       77     2300 SH       Defined  0                                 2300
DONALDSON CO INC               CS               257651109       62     1700 SH       Defined  0                                 1700
ENSCO PLC CL A                 CS               G3157S106    78756  1312600 SH       Sole     0                              1312600
                                                             68364  1139400 SH       Defined  0                     1013400   126000
ENZON PHARMACEUTICALS INC      CS               293904108     1443   379826 SH       Defined  0                      379826
FEDERATED INVESTORS INC-CL B   CS               314211103    13136   554943 SH       Sole     0                               554943
                                                             16157   682600 SH       Defined  0                      595700    86900
FIRST ADVANTAGE BANCORP        CS               31848L104     1184    92850 SH       Defined  0                       92850
FLIR SYSTEMS INC.              CS               302445101      117     4500 SH       Defined  0                                 4500
FMC TECHNOLOGIES INC           CS               30249U101    38970   716500 SH       Sole     0                               716500
                                                               593    10900 SH       Defined  0                                10900
FOOT LOCKER INC                CS               344849104    23365   682400 SH       Sole     0                               682400
                                                             28132   821600 SH       Defined  0                      710200   111400
FRANKLIN ELECTRIC CO INC       CS               353514102    32583   970600 SH       Sole     0                               970600
                                                               524    15600 SH       Defined  0                                15600
FRANKLIN FINANCIAL CORPORATION CS               35353C102     1124    61598 SH       Defined  0                       61598
GOOGLE INC.                    CS               38259P508   203272   256000 SH       Sole     0                               256000
                                                              9192    11576 SH       Defined  0                       11101      475
GRACO INC                      CS               384109104    43052   741900 SH       Sole     0                               741900
                                                               795    13700 SH       Defined  0                                13700
HEALTH NET INC                 CS               42222G108    76078  2658200 SH       Sole     0                              2658200
                                                              4594   160500 SH       Defined  0                      156500     4000
HEARTLAND EXPRESS, INC         CS               422347104    23573  1767100 SH       Sole     0                              1767100
                                                               311    23300 SH       Defined  0                                23300
HELIX ENERGY SOLUTIONS GRP     CS               42330P107      192     8400 SH       Defined  0                                 8400
HELMERICH & PAYNE INC          CS               423452101     9803   161500 SH       Sole     0                               161500
                                                             13008   214300 SH       Defined  0                      184100    30200
HERITAGE FINANCIAL CORP        CS               42722X106     3987   275000 SH       Defined  0                      275000
HEWLETT PACKARD COMPANY        CS               428236103    71325  2991800 SH       Sole     0                              2991800
                                                              9157   384100 SH       Defined  0                      378300     5800
HNI CORPORATION                CS               404251100    38249  1077733 SH       Sole     0                              1077733
                                                               685    19300 SH       Defined  0                                19300
HOME FEDERAL  BANCORP INC      CS               43710G105     1937   151290 SH       Defined  0                      151290
IDEX CORP.                     CS               45167R104    39846   745900 SH       Sole     0                               745900
                                                               855    16000 SH       Defined  0                                16000
INTEL CORPORATION              CS               458140100   112309  5140000 SH       Sole     0                              5140000
                                                              5181   237100 SH       Defined  0                      223700    13400
INTERDIGITAL INC               CS               45867G101    44035   920648 SH       Sole     0                               920648
                                                             52149  1090300 SH       Defined  0                      940900   149400
INTERPUBLIC GROUP COMPANIES IN CS               460690100   124206  9532300 SH       Sole     0                              9532300
                                                              5992   459900 SH       Defined  0                      444400    15500
ITT CORPORATION                CS               450911201    50486  1775800 SH       Sole     0                              1775800
                                                              3675   129263 SH       Defined  0                      126563     2700
JOHNSON & JOHNSON              CS               478160104   152461  1870000 SH       Sole     0                              1870000
                                                              6645    81500 SH       Defined  0                       78300     3200
KNIGHT TRANSPORTATION, INC     CS               499064103    24617  1529000 SH       Sole     0                              1529000
                                                               333    20700 SH       Defined  0                                20700
LANDAUER INC                   CS               51476K103      727    12900 SH       Sole     0                                12900
LIFE TECHNOLOGIES CORP.        CS               53217V109    37169   575098 SH       Sole     0                               575098
                                                               679    10500 SH       Defined  0                                10500
LOWE'S COS INC                 CS               548661107   118310  3120000 SH       Sole     0                              3120000
                                                              5442   143500 SH       Defined  0                      136700     6800
MAIDENFORM BRANDS INC          CS               560305104       14      800 SH       Defined  0                                  800
MANPOWERGROUP                  CS               56418H100    15116   266500 SH       Sole     0                               266500
                                                               425     7500 SH       Defined  0                                 7500
MAXIM INTEGRATED PRODUCTS      CS               57772K101    22313   683400 SH       Sole     0                               683400
                                                               300     9200 SH       Defined  0                                 9200
MICROCHIP TECHNOLOGY INC       CS               595017104    29910   813651 SH       Sole     0                               813651
                                                               408    11100 SH       Defined  0                                11100
MICROSOFT CORP                 CS               594918104   335166 11715000 SH       Sole     0                             11715000
                                                             35657  1246300 SH       Defined  0                     1214600    31700
NAUGATUCK VALLEY FINL CORP     CS               63906P107      172    24012 SH       Defined  0                       24012
NEWFIELD EXPLORATION CO        CS               651290108    24375  1087200 SH       Sole     0                              1087200
                                                             32220  1437100 SH       Defined  0                     1258700   178400
NOBLE CORPORATION              CS               H5833N103    39386  1032400 SH       Sole     0                              1032400
                                                              8656   226900 SH       Defined  0                      211100    15800
O'REILLY AUTOMOTIVE, INC.      CS               67103H107    81630   796000 SH       Sole     0                               796000
                                                              1241    12100 SH       Defined  0                                12100
OCCIDENTAL PETROLEUM CORP      CS               674599105   158229  2019000 SH       Sole     0                              2019000
                                                              6842    87300 SH       Defined  0                       82800     4500
OMNICARE INC                   CS               681904108   238049  5846000 SH       Sole     0                              5846000
                                                             28199   692500 SH       Defined  0                      681000    11500
ORACLE CORPORATION             CS               68389X105   199363  6164600 SH       Sole     0                              6164600
                                                              9214   284900 SH       Defined  0                      269300    15600
OSHKOSH CORP                   CS               688239201    53831  1266900 SH       Sole     0                              1266900
                                                             64988  1529500 SH       Defined  0                     1331400   198100
OWENS ILLINOIS INC             CS               690768403   154972  5815100 SH       Sole     0                              5815100
                                                              7177   269307 SH       Defined  0                      260007     9300
PARKWAY PROPERTIES INC         CS               70159Q104     6027   324900 SH       Defined  0                      324900
PATTERSON-UTI ENERGY INC       CS               703481101    19158   803600 SH       Sole     0                               803600
                                                             24944  1046318 SH       Defined  0                      926518   119800
PETSMART INC                   CS               716768106    26268   423000 SH       Sole     0                               423000
                                                               379     6100 SH       Defined  0                        6100
POAGE BANKSHARES INC           CS               730206109     1800   120404 SH       Defined  0                      120404
REGIS CORP                     CS               758932107     7514   413100 SH       Sole     0                               413100
                                                               333    18300 SH       Defined  0                       17900      400
RELIANCE STEEL & ALUMINUM      CS               759509102    18612   261508 SH       Sole     0                               261508
                                                             20874   293300 SH       Defined  0                      256000    37300
ROSETTA RESOURCES INC REG      CS               777779307    28719   603600 SH       Defined  0                      384500   219100
ROSETTA RESOURCES INC.         CS               777779109    68577  1441302 SH       Sole     0                              1441302
                                                             44535   936000 SH       Defined  0                      936000
ROWAN COMPANIES PLC            CS               G7665A101   142440  4028276 SH       Sole     0                              4028276
                                                            113209  3201600 SH       Defined  0                     2836000   365600
RUSH ENTERPRISES INC CL B      CS               781846308      750    36400 SH       Defined  0                       36400
SCANSOURCE, INC.               CS               806037107    42493  1505764 SH       Sole     0                              1505764
                                                               799    28300 SH       Defined  0                                28300
SIGMA-ALDRICH CORPORATION      CS               826552101      303     3900 SH       Defined  0                                 3900
SIGNET JEWELERS LIMITED        CS               G81276100    85948  1282800 SH       Sole     0                              1282800
                                                             21185   316200 SH       Defined  0                      259000    57200
SM ENERGY COMPANY              CS               78454L100    20247   341900 SH       Sole     0                               341900
                                                             30788   519900 SH       Defined  0                      410100   109800
SUNCOKE ENERGY PARTNERS L P    CS               86722Y101     4276   204600 SH       Defined  0                      204600
TE CONNECTIVITY LTD            CS               H84989104    31590   753400 SH       Sole     0                               753400
                                                              1359    32400 SH       Defined  0                       31600      800
THE TORO COMPANY               CS               891092108      226     4900 SH       Defined  0                                 4900
THERMO FISHER SCIENTIFIC INC   CS               883556102   282631  3695000 SH       Sole     0                              3695000
                                                             13064   170800 SH       Defined  0                      161100     9700
TIDEWATER INC                  CS               886423102      111     2200 SH       Defined  0                                 2200
TRACTOR SUPPLY COMPANY         CS               892356106       73      700 SH       Defined  0                                  700
TRAVELERS COS INC              CS               89417E109    58512   695000 SH       Sole     0                               695000
                                                              2652    31500 SH       Defined  0                       29700     1800
TRINITY INDUSTRIES INC         CS               896522109    16029   353600 SH       Sole     0                               353600
                                                             20584   454100 SH       Defined  0                      401100    53000
UNILEVER N V N Y SHS NEW       CS               904784709      381     9300 SH       Defined  0                        9300
VARIAN MEDICAL SYSTEM INC      CS               92220P105     6422    89200 SH       Sole     0                                89200
                                                                86     1200 SH       Defined  0                                 1200
VCA ANTECH INC                 CS               918194101    20941   891500 SH       Sole     0                               891500
                                                               381    16200 SH       Defined  0                                16200
VEECO INSTRS INC DEL COM       CS               922417100    12676   330700 SH       Sole     0                               330700
                                                             16060   419000 SH       Defined  0                      369100    49900
VODAFONE GROUP PLC-SP ADR      CS               92857W209   116399  4097100 SH       Sole     0                              4097100
                                                             11361   399900 SH       Defined  0                      399900
WABCO HOLDINGS INC             CS               92927K102    59260   839500 SH       Sole     0                               839500
                                                              1193    16900 SH       Defined  0                                16900
WABTEC  CORP                   CS               929740108      194     1900 SH       Defined  0                                 1900
WAL-MART STORES INC            CS               931142103    96905  1295000 SH       Sole     0                              1295000
                                                              4325    57800 SH       Defined  0                       55600     2200
WALGREEN CO                    CS               931422109   103704  2175000 SH       Sole     0                              2175000
                                                              4868   102100 SH       Defined  0                       97800     4300
WELLPOINT INC                  CS               94973V107   134116  2025000 SH       Sole     0                              2025000
                                                             15610   235700 SH       Defined  0                      232400     3300
WESTERN DIGITAL CORP.          CS               958102105    73866  1469100 SH       Sole     0                              1469100
                                                             95130  1892000 SH       Defined  0                     1671100   220900
WW GRAINGER, INC.              CS               384802104      315     1400 SH       Defined  0                                 1400
XEROX CORP                     CS               984121103    79410  9233700 SH       Sole     0                              9233700
                                                              3654   424900 SH       Defined  0                      405800    19100
ZEBRA TECHNOLOGIES CORP. CL A  CS               989207105    39368   835300 SH       Sole     0                               835300
                                                               614    13025 SH       Defined  0                                13025
PROLOGIS 6.75% SERIES S PFD.   PS               74340W400     3008   120000 SH       Sole     0                               120000
TESCO PLC SPONSORED ADR        AD               881575302      234    13400 SH       Defined  0                       13400
INTERDIGITAL INC CV            CV               458660AB3    20651 18500000 PRN      Defined  0                    18500000
NAVISTAR INTL CORP             CV               63934EAL2     9377  9193000 PRN      Sole     0                              9193000
                                                              2863  2807000 PRN      Defined  0                     2807000
BANK OF AMERICA CORP WT        WT               060505146      372    65277 SH       Defined  0                       65277
JPMORGAN CHASE & CO            WT               46634E114      142    10000 SH       Defined  0                       10000

S Report Summary 213 Data Records                        9,206,098