LIVE FROM THE DATABASETRANSACTIONS 362,430COMPANIES 5,763LATEST TRADE Oct 16UPDATED Oct 17, 12:31 AM
SEICCIK 0000350894

SEI INVESTMENTS CO

110 transactions by 14 insiders, from November 17, 2025 to September 30, 2026.

Transactions
11014 insiders
Bought · P
Nonenobody bought on the open market
Sold · S
$48.1Mopen market
Net
−$48.1Mnet selling

Officers and directors

People inside the company. What they do with their own shares is the reason this data exists.

InsiderTradesPlannedBoughtSold
Mark Andrew WarnerOfficer20——$2.2M
Ryan HickeCEO19——$11.1M
Sanjay SharmaOfficer11——$4.2M
Kathryn McCarthyDir10——$1.9M
Philip McCabeOfficer9——$4.5M
Michael PetersonPres9——$7.6M
William DoranDir6——$1.0M
Carl GuarinoDir5——$1.0M
Sean DenhamCFO3———
Carmen RomeoDir3——$549K
Sneha S. ShahOfficer1———
Jonathan BrassingtonDir1———
Michael LanePres1——$247K

Large holders and funds

Holders above 10%, often funds. They file the same form, but they trade for portfolio reasons, not because of what they know.

InsiderTradesPlannedBoughtSold
Alfred P. West Jr.Other12——$13.5M

All transactions

110 in total, newest filings first.

InsiderDateCodeSharesPriceValue
Alfred P. West Jr.OtherSep 30S5,483$103.16$566K
Alfred P. West Jr.OtherSep 29S28,394$103.40$2.9M
Michael LanePresSep 22S2,400$102.78$247K
Ryan HickeCEODERIVSep 3M20,000——
Ryan HickeCEODERIVSep 3M17,500——
Ryan HickeCEOSep 3S37,500$110.71$4.2M
Ryan HickeCEOSep 3M20,000$64.43$1.3M
Ryan HickeCEOSep 3M17,500$48.47$848K
Carmen RomeoDirDERIVSep 1M5,000——
Carmen RomeoDirSep 1S5,000$109.70$549K
Carmen RomeoDirSep 1M5,000$49.63$248K
Michael PetersonPresDERIVAug 28M37,500——
Michael PetersonPresAug 28S37,500$111.51$4.2M
Michael PetersonPresAug 28M37,500$56.54$2.1M
Philip McCabeOfficerDERIVAug 5M5,043——
Philip McCabeOfficerDERIVAug 4M15,000——
Philip McCabeOfficerDERIVAug 4M9,957——
Philip McCabeOfficerAug 5S5,043$105.50$532K
Philip McCabeOfficerAug 5M5,043$49.63$250K
Philip McCabeOfficerAug 4S24,957$105.04$2.6M
Philip McCabeOfficerAug 4M15,000$49.63$744K
Philip McCabeOfficerAug 4M9,957$49.63$494K
Kathryn McCarthyDirDERIVAug 3M5,000——
Kathryn McCarthyDirDERIVAug 3M5,000——
Kathryn McCarthyDirAug 3S10,000$103.54$1.0M
Kathryn McCarthyDirAug 3M5,000$71.12$356K
Kathryn McCarthyDirAug 3M5,000$71.12$356K
Mark Andrew WarnerOfficerDERIVJul 28M5,000——
Mark Andrew WarnerOfficerDERIVJul 28M5,000——
Mark Andrew WarnerOfficerDERIVJul 28M2,500——
Mark Andrew WarnerOfficerDERIVJul 28M2,500——
Mark Andrew WarnerOfficerJul 28S7,400$102.97$762K
Mark Andrew WarnerOfficerJul 28S5,300$102.01$541K
Mark Andrew WarnerOfficerJul 28S2,300$101.11$233K
Mark Andrew WarnerOfficerJul 28M5,000$56.54$283K
Mark Andrew WarnerOfficerJul 28M5,000$56.54$283K
Mark Andrew WarnerOfficerJul 28M2,500$64.43$161K
Mark Andrew WarnerOfficerJul 28M2,500$64.43$161K
Michael PetersonPresDERIVJul 28M25,000——
Michael PetersonPresJul 28S25,000$102.05$2.6M
Michael PetersonPresJul 28M25,000$55.73$1.4M
Carl GuarinoDirDERIVJul 28M5,000——
Carl GuarinoDirDERIVJul 28M5,000——
Carl GuarinoDirJul 28S10,000$103.20$1.0M
Carl GuarinoDirJul 28M5,000$49.63$248K
Carl GuarinoDirJul 28M5,000$49.63$248K
Sanjay SharmaOfficerDERIVJul 24M10,000——
Sanjay SharmaOfficerDERIVJul 24M10,000——
Sanjay SharmaOfficerJul 24S20,000$99.33$2.0M
Sanjay SharmaOfficerJul 24M10,000$71.12$711K
Sanjay SharmaOfficerJul 24M10,000$71.12$711K
Sneha S. ShahOfficerJul 24F3,746$96.73$362K
Alfred P. West Jr.OtherJun 29S1,680$88.09$148K
Alfred P. West Jr.OtherJun 29S5,652$87.18$493K
Alfred P. West Jr.OtherJun 26S3,838$87.67$336K
Alfred P. West Jr.OtherJun 26S46,162$87.21$4.0M
William DoranDirJun 9S5,000$90.50$453K
Kathryn McCarthyDirDERIVMay 4M5,000——
Kathryn McCarthyDirDERIVMay 4M5,000——
Kathryn McCarthyDirMay 4S10,000$91.07$911K
Kathryn McCarthyDirMay 4M5,000$49.63$248K
Kathryn McCarthyDirMay 4M5,000$49.63$248K
Mark Andrew WarnerOfficerDERIVApr 28M2,000——
Mark Andrew WarnerOfficerDERIVApr 28M2,000——
Mark Andrew WarnerOfficerApr 28S4,000$91.16$365K
Mark Andrew WarnerOfficerApr 28M4,000$48.47$194K
Philip McCabeOfficerApr 23S15,000$91.82$1.4M
Sanjay SharmaOfficerDERIVApr 23M12,500——
Sanjay SharmaOfficerDERIVApr 23M12,500——
Sanjay SharmaOfficerApr 23S1,559$90.73$141K
Sanjay SharmaOfficerApr 23S23,441$90.08$2.1M
Sanjay SharmaOfficerApr 23M12,500$49.63$620K
Sanjay SharmaOfficerApr 23M12,500$49.63$620K
Michael PetersonPresDERIVApr 23M10,000——
Michael PetersonPresApr 23S10,000$90.00$900K
Michael PetersonPresApr 23M10,000$48.47$485K
Ryan HickeCEOMar 31F4,349$77.21$336K
Sean DenhamCFOMar 18F7,673$78.77$604K
Alfred P. West Jr.OtherMar 11S1,371$79.94$110K
Alfred P. West Jr.OtherMar 11S6,076$79.11$481K
Alfred P. West Jr.OtherMar 10S29,431$80.47$2.4M
Alfred P. West Jr.OtherMar 10S25,391$79.97$2.0M
Alfred P. West Jr.OtherMar 10S178$78.88$14K
Mark Andrew WarnerOtherDERIVFeb 25M2,000——
Mark Andrew WarnerOtherDERIVFeb 25M2,000——
Mark Andrew WarnerOtherFeb 25S4,000$81.74$327K
Mark Andrew WarnerOtherFeb 25A2,000$71.12$142K
Mark Andrew WarnerOtherFeb 25A2,000$71.12$142K
Ryan HickeCEODERIVJan 29M17,500——
Ryan HickeCEODERIVJan 29M20,000——
Ryan HickeCEODERIVJan 29M17,500——
Ryan HickeCEODERIVJan 29M12,500——
Ryan HickeCEODERIVJan 29M12,500——
Ryan HickeCEOJan 29S13,054$88.06$1.1M
Ryan HickeCEOJan 29S49,937$87.39$4.4M
Ryan HickeCEOJan 29S17,009$86.75$1.5M
Ryan HickeCEOJan 29M17,500$56.54$989K
Ryan HickeCEOJan 29M20,000$64.43$1.3M
Ryan HickeCEOJan 29M17,500$48.47$848K
Ryan HickeCEOJan 29M12,500$71.12$889K
Ryan HickeCEOJan 29M12,500$71.12$889K
Alfred P. West Jr.OtherJan 1F3,482$82.02$286K
William DoranDirDec 22S7,000$83.85$587K
Jonathan BrassingtonDirDec 12A2,266——
Sean DenhamCFODERIVDec 12A49,000——
Sean DenhamCFODec 12A13,254——
William DoranDirDec 12A2,266——
William DoranDirDERIVNov 17M5,000——
William DoranDirDERIVNov 17M5,000——
William DoranDirNov 17M10,000$53.34$533K