13F-HR 1 rorer13f.txt United States Securities and Exchange Commission Washington, DC 20549 Form 13F Form 13F Cover Page Report for the Calendar Year or Quarter Ended: 3/31/08 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: Rorer Asset Management, LLC Address: Eight Tower Bridge 161 Washington St., Suite 1500 Conshohocken, PA 19428 13F File Number: 028-03869 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 D. Leininger Title: Principal, Senior Equity Analyst, COO & CCO Phone: (484)530-4300 I AM SIGNING THIS REPORT AS REQUIRED BY THE SECURITIES EXCHANGE ACT OF 1934. Signature, Place and Date of Signing: /s/ Robert D. Leininger ------------------------------------ Robert D. Leininger Conshohocken, PA April 30, 2008 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).)

RORER ASSET MANAGEMENT, LLC 13F ~~HOLDINGS~~ REPORT AS -OF ~~MARCH~~March 31, ~~2007~~2008 TITLE VOTING AUTHORITY OF VALUE SH/ PUT/ INVESTMENT SOLE SHARED NONE NAME OF ISSUER CLASS CUSIP (X $1000) SHARES PRN CALL DISCRETION MANAGERS (A) (B) (C) ----------------------------------------------------------------------------------------------------------------------- ----------------------------------------------------------------------------------------------------------------------- ~~AFLAC~~AMPHENOL ~~INC~~CORP ~~COMMON~~NEW ~~001055102~~CL ~~$35,080.63 745,448 SH DEFINED 01 673,814 463 71,171 ADMINISTAFF INC COM~~ COMMON ~~007094105~~032095101 $1,~~306~~326.2406 3735,~~109~~599 SH DEFINED 01 35,~~989~~599 0 ~~1,120~~0 ~~AMERICAN~~ANADARKO ~~INTL~~PETE ~~GROUP~~CORP COMMON ~~026874107~~032511107 $~~30,108~~504.5624 ~~447~~8,~~903~~000 SH DEFINED 01 ~~404~~8,~~639~~000 ~~273~~0 ~~42,991~~0 ~~ANADARKO~~APACHE ~~PETE~~ CORP COMMON ~~032511107~~037411105 $~~343~~805.8439 86,~~000~~666 SH DEFINED 01 6,666 0 0 ~~8,000~~APOLLO ~~APACHE~~GROUP ~~CORP~~INC CL A COMMON ~~037411105~~037604105 $~~471~~1,513.2977 635,~~666~~041 SH DEFINED 01 35,041 0 0 ~~6,666~~ APPLE COMPUTER INC COMMON 037833100 $1417,~~513~~309.4953 ~~156~~141,~~206~~126 SH DEFINED 01 141,~~605~~094 9632 ~~14,505~~0 ~~ARRIS~~APPLIED ~~GROUP~~MATLS INC COMMON ~~04269Q100~~038222105 $116,~~977~~025.8258 ~~140~~757,~~470~~024 SH DEFINED 01 ~~137~~756,~~092~~802 222 0 ~~3,378~~ BANK OF ~~AMERICA~~NEW YORK MELL COMMON ~~060505104~~064058100 $3426,~~610~~655.2779 ~~678~~626,~~356~~699 SH DEFINED 01 ~~614~~626,~~249~~514 ~~420~~185 ~~63,687~~0 BAXTER INTL INC COMMON 071813109 $2612,~~366~~771.1151 ~~500~~221,~~589~~592 SH DEFINED 01 ~~452~~221,~~111~~535 ~~306~~57 ~~48,172~~0 ~~BEAR~~BE ~~STEARNS~~AEROSPACE ~~COS~~ INC COM COMMON ~~073902108~~073302101 $1,~~781~~068.8063 1130,~~851~~576 SH DEFINED 01 1130,~~534~~576 0 ~~317~~0 BUCYRUS INTL INC NEW COMMON 118759109 $2,~~339~~377.0839 4523,~~419~~388 SH DEFINED 01 4423,~~097~~388 0 ~~1,322~~0 ~~CVS~~C ~~CORP~~H ROBINSON WORLDWID COMMON ~~126650100~~12541W209 $271,~~536~~301.9803 ~~806~~23,~~589~~916 SH DEFINED 01 ~~729~~23,~~764~~916 ~~480~~0 ~~76,345~~0 ~~CATERPILLAR~~CVS ~~INC~~CORP COMMON ~~149123101~~126650100 $2623,~~125~~932.7520 ~~389~~577,~~762~~313 SH DEFINED 01 ~~349~~577,~~877~~150 ~~239~~163 ~~39,646~~0 ~~CHECKFREE~~CATERPILLAR ~~CORP~~INC ~~NEW CO~~ COMMON ~~162813109~~149123101 $229,~~262~~115.8615 61381,~~010~~267 SH DEFINED 01 59381,~~541~~159 108 0 ~~1,469~~CHEVRON ~~CHEVRONTEXACO~~CORPORATION ~~CORP.~~ COMMON 166764100 $2714,~~417~~164.2940 ~~370~~177,~~705~~339 SH DEFINED 01 ~~335~~177,~~880~~295 ~~231~~44 ~~34,594~~0 CISCO SYS INC COMMON 17275R102 $2221,~~983~~062.7072 ~~900~~828,~~268~~603 SH DEFINED 01 ~~814~~828,~~446~~354 ~~553~~249 ~~85,269~~0 ~~CITIGROUP INC. COMMON 172967101 $32,745.24 637,800 SH DEFINED 01 578,420 390 58,990~~ CITRIX SYS INC COM COMMON 177376100 $12,~~460~~528.1851 4587,~~588~~456 SH DEFINED 01 4487,~~209~~456 0 ~~1,379~~0 ~~COCA~~CLEVELAND ~~COLA~~CLIFFS COINC COMMON ~~191216100~~185896107 $291,~~260~~490.9820 ~~609~~12,~~603~~437 SH DEFINED 01 ~~553~~12,~~999~~437 ~~387~~0 ~~55,217~~0 ~~COMMUNITY~~COGNIZANT ~~HEALTH~~TECHNLGY ~~SYS~~SL COMMON ~~203668108~~192446102 $215,~~105~~309.9837 59497,~~744~~981 SH DEFINED 01 58497,~~271~~834 147 0 ~~1,473~~ CONSOL ENERGY INC COMMON 20854P109 $1,~~359~~141.0650 3416,~~732~~498 SH DEFINED 01 3316,~~683~~498 0 ~~1,049~~0 CORNING INC COMMON 219350105 $2826,~~716~~684.2617 1,~~262~~064,~~800~~126 SH DEFINED 01 1,~~140~~063,~~489~~808 ~~776~~318 ~~121,535~~0 ~~CYMER~~CYPRESS ~~INC~~SEMICONDUCTOR COMMON ~~232572107~~232806109 $1,~~483~~258.7939 3553,~~711~~299 SH DEFINED 01 3453,~~609~~299 0 ~~1,102~~0 DANAHER CORP SHS BEN COMMON 235851102 $1428,~~858~~655.5569 ~~207~~385,~~958~~541 SH DEFINED 01 ~~188~~385,~~208~~432 ~~126~~109 ~~19,624~~0 DEVON ENERGY CORP NEW COMMON 25179M103 $1921,~~038~~039.2640 ~~275~~217,~~039~~144 SH DEFINED 01 ~~248~~217,~~442~~087 ~~170~~57 ~~26,427~~0 WALT DISNEY CO. COMMON 254687106 $~~10,440~~222.7155 ~~303~~7,~~256~~092 SH DEFINED 01 ~~269~~7,~~932~~092 ~~215~~0 330 DRESSER-RAND GROUP IN COMMON 261608103 $1,~~109~~083.14 ~~ENSCO~~35,224 ~~INTL~~SH DEFINED 01 35,224 0 0 DRIL-QUIP INC COM COMMON ~~26874Q100~~262037104 $231,~~755~~118.8295 ~~436~~24,~~673~~079 SH DEFINED 01 ~~397~~24,~~556~~079 ~~242~~0 380 E M C CORP MASS COMMON 268648102 $17,~~875~~878.59 1,146,927 SH DEFINED 01 1,146,580 347 0 EBAY INC COM COMMON 278642103 $2516,~~016~~971.1789 ~~754~~538,~~621~~366 SH DEFINED 01 ~~682~~538,~~776~~208 ~~464~~158 ~~71,381~~0 ~~EMULEX~~ELECTRONIC ~~CORP~~ARTS ~~NEW~~COM COMMON ~~292475209~~285512109 $117,~~441~~081.8230 78337,~~831~~632 SH DEFINED 01 76337,~~018~~539 93 0 2EURONET WORLDWIDE INC COMMON 298736109 $939.73 48,~~813~~792 SH DEFINED 01 48,792 0 0 EXPRESS SCRIPTS INC C COMMON 302182100 $2120,~~649~~497.4299 ~~268~~322,~~205~~739 SH DEFINED 01 ~~244~~322,~~753~~643 ~~142~~96 ~~23,310~~0 ~~FIRST~~FISERV ~~MARBLEHEAD~~INC ~~CORP~~ COMMON ~~320771108~~337738108 $223,~~625~~224.2171 58476,~~481~~944 SH DEFINED 01 56476,~~798~~814 130 0 ~~1,683~~FREEPORT ~~FRONTIER~~MCMORAN ~~OIL~~COPP ~~CORP COM~~ COMMON ~~35914P105~~35671D857 $115,~~830~~236.8824 56172,~~093~~287 SH DEFINED 01 54172,~~600~~245 42 0 ~~1,493~~ GAMESTOP CORP CLASS A COMMON 36467W109 $1,~~326~~152.7446 4022,~~735~~287 SH DEFINED 01 3922,~~189~~287 0 ~~1,546~~0 ~~GENERAL~~G ~~ELEC~~A COP INC COMMON ~~369604103~~364760108 $3416,~~160~~351.3915 ~~966~~767,~~059~~282 SH DEFINED 01 ~~875~~767,~~538~~027 ~~605~~255 ~~89,916~~0 ~~HALLIBURTON~~GOLDMAN ~~COMPANY~~SACHS GROUP I COMMON ~~406216101~~38141G104 $3314,~~536~~083.6497 1107,~~056,598~~425 SH DEFINED 01 ~~954~~107,~~980~~403 ~~653~~22 ~~100,965~~0 ~~HEWLETT~~HALLIBURTON ~~PACKARD~~COMPANY COMMON ~~428236103~~406216101 $929,~~833~~680.5322 ~~244~~739,~~982~~758 SH DEFINED 01 ~~221~~739,~~560~~536 ~~150~~222 ~~23,272~~0 ~~HOME~~HARLEY ~~DEPOT~~DAVIDSON INC COMMON ~~437076102~~412822108 $207,~~114~~442.0019 ~~547~~181,~~453~~199 SH DEFINED 01 ~~495~~181,~~977~~154 ~~336~~45 ~~51,140~~0 ~~IAC~~HOLOGIC ~~INTERACTIVE~~INC ~~CORP~~ COMMON ~~44919P300~~436440101 $3010,~~331~~244.5413 ~~804~~291,~~329~~355 SH DEFINED 01 ~~732~~291,~~319~~271 ~~466~~84 ~~71,544~~0 ILLINOIS TOOL WORKS I COMMON 452308109 $1825,~~864~~690.0153 ~~365~~526,~~588~~775 SH DEFINED 01 ~~330~~526,~~531~~620 ~~224~~155 ~~34,833~~0 ~~INTUIT~~ION ~~INC~~GEOPHYSICAL ~~COM~~CORP COMMON ~~461202103~~462044108 $211,~~379~~022.2635 ~~781~~74,~~403~~083 SH DEFINED 01 ~~706~~74,~~688~~083 ~~480~~0 740 J.P. MORGAN CHASE & C COMMON 46625H100 $10,~~235~~887.21 242,713 SH DEFINED 01 242,647 66 0 JANUS CAP GROUP INC COMMON 47102X105 $21,~~325~~472.9036 ~~111~~63,~~234~~273 SH DEFINED 01 ~~107~~63,~~928~~273 0 ~~3,306~~0 JOHNSON & JOHNSON COMMON 478160104 $22,~~618~~990.8724 ~~375~~358,~~361~~707 SH DEFINED 01 ~~340~~358,~~919~~604 ~~217~~103 340 JONES LANG LASALLE IN COMMON 48020Q107 $722.05 9,~~225~~336 SH DEFINED 01 9,336 0 0 JOY GLOBAL INC COM COMMON 481165108 $24,843.40 385,704 SH DEFINED 01 385,595 109 0 KAYDON CORP COMMON 486587108 $21,~~482~~383.7888 5831,~~336~~516 SH DEFINED 01 5631,~~930~~516 0 ~~1,406~~0 L-3 COMMUNICATIONS COMMON 502424104 $~~36,662~~298.5783 ~~419~~2,~~147~~733 SH DEFINED 01 ~~381~~2,~~617~~733 ~~245~~0 ~~37,285~~0 ~~LINEAR~~LAM ~~TECHNOLOGY~~RESEARCH ~~COR~~CORP COM COMMON ~~535678106~~512807108 $~~36,197~~875.0432 122,~~145,811~~902 SH DEFINED 01 122,~~039,342~~902 ~~670~~0 ~~105,799~~0 ~~MBIA~~LAUDER ESTEE COS INC COMMON ~~55262C100~~518439104 $2510,~~930~~212.5040 ~~395~~214,~~946~~781 SH DEFINED 01 ~~362~~214,~~242~~725 ~~212~~56 ~~33,492~~0 ~~MSC~~LEGG ~~INDL~~MASON ~~DIRECT~~ INC CCOM COMMON ~~553530106~~524901105 $29,~~361~~756.8775 50173,~~597~~907 SH DEFINED 01 49173,~~090~~864 43 0 ~~1,507~~LINCOLN ~~MARSH~~NATL ~~MCLENNAN~~CORP IND COMMON ~~571748102~~534187109 $3411,~~309~~012.6544 1208,~~171,390~~761 SH DEFINED 01 1208,~~059,094~~707 ~~718~~54 ~~111,578~~0 ~~MEDTRONIC~~LINEAR ~~INC~~TECHNOLOGY COR COMMON ~~585055106~~535678106 $2425,~~760~~458.7554 ~~504~~800,~~699~~920 SH DEFINED 01 ~~456~~800,~~676~~693 ~~310~~227 ~~47,713~~0 ~~MERRILL~~LOWES ~~LYNCH &~~ CO. COMMON ~~590188108~~548661107 $308,~~227~~033.2021 ~~370~~300,~~117~~457 SH DEFINED 01 ~~336~~300,~~136~~372 ~~228~~85 ~~33,753~~0 ~~MOLEX~~MSC ~~INC~~INDL ~~CLASS~~DIRECT AINC C COMMON ~~608554200~~553530106 $1,~~313~~510.8740 5235,~~787~~749 SH DEFINED 01 5135,~~188~~749 0 ~~1,599~~0 ~~NEWFIELD~~MANPOWER ~~EXPL~~INC CO COMMON ~~651290108~~56418H100 $217,~~210~~460.3449 52310,~~993~~144 SH DEFINED 01 51310,~~708~~065 79 0 ~~1,285~~MCCORMICK ~~OFFICE~~& ~~DEPOT~~CO INC NO COMMON ~~676220106~~579780206 $21,~~448~~169.7781 6931,~~686~~642 SH DEFINED 01 6831,~~003~~642 0 ~~1,683~~0 ~~OPTIONSXPRESS~~MORGAN ~~HLDGS~~STANLEY I COMMON ~~684010101~~617446448 $~~809~~13,251.6400 34281,~~394~~877 SH DEFINED 01 33281,~~354~~801 76 0 ~~1,040~~NEW ~~OSHKOSH~~YORK ~~TRUCK~~CMNTY ~~CORP~~BANCOR CO COMMON ~~688239201~~649445103 $21,~~495~~164.7724 4763,~~090~~899 SH DEFINED 01 4563,~~922~~899 0 ~~1,168~~0 ~~PARKER~~NEWFIELD ~~HANNIFIN~~EXPL ~~CORP~~CO COMMON ~~701094104~~651290108 $21,~~804~~023.3018 3219,~~491~~360 SH DEFINED 01 3119,~~539~~360 0 ~~952~~0 ~~PEPSICO~~OPTIONSXPRESS ~~INC~~HLDGS I COMMON ~~713448108~~684010101 $301,~~176~~248.9601 ~~474~~60,~~767~~261 SH DEFINED 01 ~~430~~60,~~734~~261 ~~294~~0 ~~43,739~~0 ~~PETSMART~~OSHKOSH ~~INC~~TRUCK ~~COM~~CORP CO COMMON ~~716768106~~688239201 $~~707~~1,130.6219 2131,~~469~~152 SH DEFINED 01 2031,~~820~~152 0 ~~649~~0 ~~PHARMACEUTICAL~~PARKER ~~PROD~~HANNIFIN DCORP COMMON ~~717124101~~701094104 $1,~~398~~701.0021 4124,~~496~~559 SH DEFINED 01 4024,~~246~~559 0 10 PEPSICO INC COMMON 713448108 $293.64 4,~~250~~067 ~~PROASSURANCE~~SH ~~CORP~~DEFINED ~~COM~~01 4,067 0 0 PHARMACEUTICAL PROD D COMMON ~~74267C106~~717124101 $1,~~891~~504.0776 3635,~~971~~913 SH DEFINED 01 35,~~985~~913 0 ~~986~~0 ~~PROCTER~~PROASSURANCE &CORP ~~GAMBLE~~COM COMMON ~~742718109~~74267C106 $291,~~756~~440.3933 ~~471~~26,~~127~~757 SH DEFINED 01 ~~427~~26,~~264~~757 ~~291~~0 ~~43,572~~0 ~~QUEST~~PSYCHIATRIC ~~DIAGNOSTICS~~SOLUTIONS ~~INC~~ COMMON ~~74834L100~~74439H108 $151,~~131~~526.2403 ~~303~~44,~~404~~989 SH DEFINED 01 ~~274~~44,~~177~~989 ~~189~~0 ~~29,038~~0 ~~RESPIRONICS~~QUEST DIAGNOSTICS INC COMMON ~~761230101~~74834L100 $220,~~463~~721.6400 58449,~~672~~226 SH DEFINED 01 57449,~~079~~095 131 0 ~~1,593~~RELIANCE STSTL ~~JUDE~~& ~~MEDICAL~~ALUM ~~CENTE~~C COMMON ~~790849103~~759509102 $111,~~640~~393.4213 ~~309~~23,~~484~~273 SH DEFINED 01 ~~277~~23,~~709~~273 ~~188~~0 ~~31,587~~0 ~~SPRINT~~SEI CORP ~~COM~~ COMMON ~~852061100~~784117103 $171,~~686~~135.0439 ~~932~~45,~~808~~986 SH DEFINED 01 ~~818~~45,~~217~~986 ~~742~~0 ~~113,849~~0 ~~STAPLES~~ST JUDE MEDICAL INC COMMON ~~855030102~~790849103 $218,~~307~~468.1825 89417,~~287~~069 SH DEFINED 01 87416,~~129~~953 116 0 ~~2,158~~SOTHEBY TDHLDGS ~~AMERITRADE~~INC ~~HLDG~~CL CO COMMON ~~87236Y108~~835898107 $~~28,021~~987.5800 134,~~883,161~~140 SH DEFINED 01 134,~~724,865~~140 ~~984~~0 ~~157,312~~0 ~~TARGET~~SYNAPTICS ~~CORP~~INC COM COMMON ~~87612E106~~87157D109 $~~25,418~~887.2019 ~~428~~37,~~917~~152 SH DEFINED 01 ~~389~~37,~~088~~152 ~~267~~0 ~~39,562~~0 ~~THERMO~~TD ~~FISHER~~AMERITRADE ~~SCIENTI~~HLDG CO COMMON ~~883556102~~87236Y108 $2217,~~605~~719.1603 ~~483~~990,~~530~~983 SH DEFINED 01 ~~440~~990,~~476~~712 ~~264~~271 ~~42,790~~0 ~~THOMAS~~TARGET ~~& BETTS~~ CORP COMMON ~~884315102~~87612E106 $216,~~359~~386.4222 48319,~~329~~364 SH DEFINED 01 47319,~~165~~273 91 0 ~~1,164~~TEREX ~~TIME~~CORP ~~WARNER~~NEW COM COMMON ~~887317105~~880779103 $2318,~~385~~219.3982 1294,~~185,915~~698 SH DEFINED 01 1294,~~072,947~~624 ~~743~~74 ~~112,225~~0 ~~TRAVELERS~~THERMO ~~COMPANIES~~FISHER ISCIENTI COMMON ~~89417E109~~883556102 $3017,~~732~~924.4164 ~~593~~315,~~641~~485 SH DEFINED 01 ~~536~~315,~~111~~395 ~~364~~90 ~~57,166~~0 ~~UCBH~~TIFFANY ~~HLDGS~~& ~~INC~~CO NEW COM COMMON ~~90262T308~~886547108 $~~2,499~~932.3407 ~~134~~22,~~229~~277 SH DEFINED 01 ~~130~~22,~~983~~277 0 ~~3,246~~0 ~~UAP~~VALERO ~~HLDG~~ENERGY CORP ~~COM~~CO COMMON ~~903441103~~91913Y100 $~~925~~15,247.6648 35305,~~809~~306 SH DEFINED 01 34305,~~729~~222 84 0 ~~1,080~~WAL ~~UNITED~~MART ~~PARCEL~~STORES ~~SVC~~ INC COMMON ~~911312106~~931142103 $1324,~~452~~858.9335 ~~191~~469,~~910~~334 SH DEFINED 01 ~~171~~469,~~045~~194 ~~137~~140 ~~20,728~~0 ~~VALERO~~ZIMMER ~~ENERGY~~HLDGS ~~CORP~~INC CO COMMON ~~91913Y100~~98956P102 $3016,~~995~~571.5694 ~~480~~222,~~632~~085 SH DEFINED 01 ~~435~~222,~~325~~026 ~~298~~59 ~~45,009~~0 ~~VARIAN~~FOSTER ~~MED~~WHEELER ~~SYS~~LTD ~~INC~~SH COMMON ~~92220P105~~G36535139 $212,~~588~~490.7605 54220,~~283~~602 SH DEFINED 01 52220,~~940~~549 53 0 ~~1,343~~NABORS ~~WYETH~~INDUSTRIES LTD COMMON ~~983024100~~G6359F103 $3018,~~073~~043.7882 ~~601~~511,~~117~~413 SH DEFINED 01 ~~543~~511,~~654~~280 ~~372~~133 ~~57,091~~0 ~~ZENITH~~TRANSOCEAN ~~NATL~~INC ~~INS~~COM ~~CORP~~NE COMMON ~~989390109~~G90073100 $~~824~~18,923.3444 17159,~~439~~648 SH DEFINED 01 16159,~~916~~609 39 0 ~~523~~TYCO ~~ZIMMER~~INTERNATIONAL ~~HLDGS~~LT ~~INC~~ COMMON ~~98956P102~~G9143X208 $1418,~~479~~383.5930 ~~169~~407,~~527~~671 SH DEFINED 01 ~~153~~407,~~069~~553 ~~104~~118 ~~16,354~~0 --------------------- ------------------------ --------------------- ------------------------ TOTALS: $1899,~~214,040~~624.6170 2921,~~178~~060,~~636~~668 2621,~~514~~055,~~544~~031 165,~~724~~637 ~~2,647,368~~0 =====================~~===========~~ ========================~~========~~

FORM 13F SUMMARY PAGE Number of Other Included Managers: 2 Form 13F Information Table Entry Total: 85 Form 13F Information Table Value Total: $899,625 List of Other Included Managers: Provide a numbered list of the name(s) and 13F file number(s) of all institutional investment managers with respect to which this report is filed, other than the manager filing this report. No. 13F File Number Name ------------------- ---- 1 28-3326 Managers Investment Group LLC 2 28-04975 Affiliated Managers Group, Inc.

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