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Nasdaq · CIK 0000350894

SEIC SEI INVESTMENTS CO

Insider trading from SEC Form 4. Last filing 12 d ago. Close $104.70 on Oct 9, 2026, +40% from the 52-week low and -6% from the high.

SEI INVESTMENTS CO (SEIC) has 78 SEC Form 4 filings on file from 13 insiders, the latest filed on Oct 1, 2026. In the last 90 days insiders made 0 open-market buys worth $0 and 5 open-market sells worth $13M, net -$13M.

35 open-market trades have been scored at SEIC. The newest: Alfred P West Jr (Executive Chairman) sold $3.5M of stock on Sep 29, 2026, filed Oct 1, 2026, scored 41 (moderate). The largest of the 35 shown: Alfred P West Jr (Executive Chairman) sold $13M on Dec 13, 2024, scored 45 (moderate). 2 insiders sold within 14 days of each other around Sep 29, 2026.

SEIC closed at $104.70 on Oct 9, 2026, 40% above its 52-week low and 6% below its 52-week high.

25 Form 144 notices of planned sales are on file, the latest filed Sep 29, 2025.

Last 90 days

Net insider value
-$13M
more sold than bought
Buys
0
$0 by 0 insiders
Sells
5
$13M by 5 insiders
Insiders on file
13
with a Form 4 at this company

Price and insider trades, last year

SEICOct 9, 2026 · close 104.70

Daily candles, adjusted for splits and dividends. Green arrows are insider buys, red are sells, sized by value. Click a marked bar to open the signal.Charts by TradingView Lightweight Charts™

Signals

Open-market buys and sells at SEI INVESTMENTS CO, scored.

ScoreInsiderValueHoldingsPrice contextFiled
41ModerateAlfred P West Jr
Executive Chairman
sell
$3.5M
33,877 shares
-0%+38% from low-7% from high
36WeakMichael Lane
Executive Vice President
sell
$247k
2,400 shares
-6%+39% from low-7% from high
55ModerateRyan Hicke
Chief Executive Officer
sell
$4.2M
37,500 shares
-16%+49% from low-0% from high
34WeakCarmen Romeo
director
sell
$549k
5,000 shares
-0%+47% from low-2% from high
60NotableMichael Peterson
Executive Vice President
sell
$4.2M
37,500 shares
-65%+49% from low0% from high
32WeakWilliam Doran
director
sell
$453k
5,000 shares
-1%+21% from low-3% from high
41ModerateAlfred P West Jr
Executive Chairman
sell
$5.0M
62,447 shares
-1%+22% from low-14% from high
36WeakMark Andrew Warner
other
sell
$327k
4,000 shares
-81%+25% from low-12% from high
45ModerateRyan Hicke
CHIEF EXECUTIVE OFFICER
sell
$7.0M
80,000 shares
-29%+34% from low-6% from high
34WeakWilliam Doran
director
sell
$587k
7,000 shares
-1%+28% from low-10% from high
38WeakPhilip McCabe
See Remarks
sell
$973k
12,000 shares
-16%+23% from low-13% from high
38WeakAlfred P West Jr
Executive Chairman
sell
$2.0M
24,770 shares
-0%+23% from low-14% from high
53ModerateMichael Peterson
EXECUTIVE VICE PRESIDENT
sell
$2.1M
25,000 shares
-65%+27% from low-11% from high
24WeakCarmen Romeo
director
sell
$420k
5,000 shares
-0%+26% from low-11% from high
36WeakKathryn McCarthy
director
sell
$857k
10,000 shares
-12%+29% from low-9% from high
41ModerateCarl Guarino
director
sell
$864k
10,000 shares
-38%+30% from low-8% from high
48ModerateRyan Hicke
CHIEF EXECUTIVE OFFICER
sell
$3.1M
35,000 shares
-17%+35% from low-6% from high
45ModerateMichael Peterson
EXECUTIVE VICE PRESIDENT
sell
$628k
7,089 shares
-34%+33% from low-7% from high
22WeakMichael Peterson
EXECUTIVE VICE PRESIDENT
sell
$61k
684 shares
-5%+34% from low-6% from high
34WeakMichael Peterson
EXECUTIVE VICE PRESIDENT
sell
$418k
4,727 shares
-26%+35% from low-6% from high
38WeakMark Andrew Warner
other
sell
$444k
5,000 shares
-79%+35% from low-6% from high
60NotableAlfred P West Jr
Executive Chairman
sell
$12M
141,126 shares
-2%+29% from low-1% from high
55ModerateRyan Hicke
CHIEF EXECUTIVE OFFICER
sell
$1.8M
21,000 shares
-11%+27% from low-4% from high
60NotableMichael Peterson
EXECUTIVE VICE PRESIDENT
sell
$4.2M
50,000 shares
-79%+29% from low-2% from high
50ModerateSanjay Sharma
See Remarks*
sell
$1.7M
20,000 shares
-46%+27% from low-4% from high
45ModerateAlfred P West Jr
Executive Chairman
sell
$13M
146,200 shares
-2%-
38WeakAlfred P West Jr
Executive Chairman
sell
$2.1M
24,994 shares
-0%-
39WeakWilliam Doran
director
sell
$409k
5,000 shares
-1%-
60NotableAlfred P West Jr
Executive Chairman
sell
$11M
137,099 shares
-2%-
57ModerateMichael Peterson
EXECUTIVE VICE PRESIDENT
sell
$791k
10,000 shares
-61%-
31WeakCarmen Romeo
director
sell
$398k
5,000 shares
-0%-
44ModerateCarl Guarino
director
sell
$573k
7,564 shares
-35%-
46ModerateRyan Hicke
Chief Executive Officer
sell
$749k
10,000 shares
-6%-
42ModeratePhilip McCabe
EVP - Head of Investment Mgmt
sell
$797k
10,500 shares
-19%-
60NotableMichael Peterson
EVP and General Counsel
sell
$1.9M
25,000 shares
-79%-

Planned sales

Form 144 notices filed before a sale of restricted or control stock, newest first. The sale itself usually reaches a Form 4 within days. All planned sales

FiledSellerSharesValueSale datePast 3 months
Sep 29, 2025 MCCARTHY KATHRYN
Director
10,000
0.01% of outstanding
$857kSep 29, 2025none
Sep 23, 2025 GUARINO CARL
Director
10,000
0.01% of outstanding
$864kSep 23, 2025none
Sep 22, 2025 MILLER STEPHANIE D.
Former Director
7,500
0.01% of outstanding
$647kSep 22, 2025none
Aug 19, 2025 Hicke Ryan
Officer
35,000
0.03% of outstanding
$3.1MAug 19, 2025none
Jul 31, 2025 Peterson Michael
Officer
12,500
0.01% of outstanding
$1.1MJul 31, 2025$4.2M
Jul 29, 2025 Warner Mark Andrew
Officer
5,000
0.00% of outstanding
$444kJul 29, 2025none
May 28, 2025 Alfred P. West, Jr.
Executive Chairman
151,000
0.12% of outstanding
$13MMay 28, 2025$12M
May 15, 2025 Peterson Michael
Officer
50,000
0.04% of outstanding
$4.2MMay 15, 2025none
May 14, 2025 Hicke Ryan
Officer
21,000
0.02% of outstanding
$1.8MMay 14, 2025none
May 14, 2025 Sharma Sanjay
Officer
20,000
0.02% of outstanding
$1.7MMay 14, 2025none
Mar 3, 2025 Warner Mark Andrew
Officer
5,000
0.00% of outstanding
$402kMar 3, 2025none
Mar 3, 2025 Alfred Paul West Jr
Affiliate
160,000
0.13% of outstanding
$13MMar 3, 2025$13M
Dec 13, 2024 Alfred Paul West Jr
Affiliate
150,000
0.12% of outstanding
$13MDec 13, 2024$16M
Dec 12, 2024 KLAUDER PAUL
Former Affiliate
12,500
0.01% of outstanding
$1.1MDec 12, 2024$2.1M
Dec 6, 2024 WEST ALFRED P JR
Officer, Director
5,984
0.00% of outstanding
$504kDec 6, 2024$13M
Dec 4, 2024 WEST ALFRED P JR
Officer, Director
19,010
0.01% of outstanding
$1.6MDec 4, 2024$11M
Nov 26, 2024 William M Doran
Director
5,000
0.00% of outstanding
$409kNov 26, 2024none
Nov 7, 2024 Alfred Paul West Jr
Affiliate
155,000
0.12% of outstanding
$12MNov 7, 2024$12M
Nov 6, 2024 Peterson Michael
Officer
10,000
0.01% of outstanding
$791kNov 6, 2024$1.9M
Nov 6, 2024 ROMEO CARMEN
Director
5,000
0.00% of outstanding
$398kNov 6, 2024none
Oct 28, 2024 GUARINO CARL
Director
7,564
0.01% of outstanding
$573kOct 28, 2024none
Oct 28, 2024 KLAUDER PAUL
Officer
27,500
0.02% of outstanding
$2.1MOct 28, 2024none
Oct 28, 2024 McCabe Philip
Officer
10,500
0.01% of outstanding
$797kOct 28, 2024none
Oct 25, 2024 Hicke Ryan
Officer
10,000
0.01% of outstanding
$749kOct 25, 2024none
Oct 25, 2024 Peterson Michael
Officer
25,000
0.02% of outstanding
$1.9MOct 25, 2024none

Transactions

The newest 50 of 188 rows filed, every code.

DateInsiderTransactionSharesPriceValueHoldings afterFiled
Sep 29, 2026Alfred P West Jr
Executive Chairman
SOpen-market sale
Common Stock
-28,394$103.40$2.9M6,790,05712 d ago
Sep 30, 2026Alfred P West Jr
Executive Chairman
SOpen-market sale
Common Stock
-5,483$103.16$566k6,784,57412 d ago
Sep 22, 2026Michael Lane
Executive Vice President
SOpen-market sale
Common Stock
-2,400$102.78$247k39,58119 d ago
Sep 3, 2026Ryan Hicke
Chief Executive Officer
MOption exercise
Common Stock
+17,500$48.47$848k210,31535 d ago
Sep 3, 2026Ryan Hicke
Chief Executive Officer
MOption exercise
Common Stock
+20,000$64.43$1.3M230,31535 d ago
Sep 3, 2026Ryan Hicke
Chief Executive Officer
SOpen-market sale
Common Stock
-37,500$110.71$4.2M192,81535 d ago
Sep 3, 2026Ryan Hicke
Chief Executive Officer
MOption exercise
Option to Purchase Common Stockderivative
-17,500--035 d ago
Sep 3, 2026Ryan Hicke
Chief Executive Officer
MOption exercise
Option to Purchase Common Stockderivative
-20,000--035 d ago
Sep 1, 2026Carmen Romeo
director
MOption exercise
Common Stock
+5,000$49.63$248k1,565,29340 d ago
Sep 1, 2026Carmen Romeo
director
SOpen-market sale
Common Stock
-5,000$109.70$549k1,560,29340 d ago
Sep 1, 2026Carmen Romeo
director
MOption exercise
Option to Purchase Common Stockderivative
-5,000--040 d ago
Aug 28, 2026Michael Peterson
Executive Vice President
MOption exercise
Common Stock
+37,500$56.54$2.1M57,64842 d ago
Aug 28, 2026Michael Peterson
Executive Vice President
SOpen-market sale
Common Stock
-37,500$111.51$4.2M20,14842 d ago
Aug 28, 2026Michael Peterson
Executive Vice President
MOption exercise
Option to Purchase Common Stockderivative
-37,500--042 d ago
Jun 9, 2026William Doran
director
SOpen-market sale
Common Stock
-5,000$90.50$453k618,802Jun 11, 2026
Mar 18, 2026Sean Denham
Executive VP, CFO, COO
FTax withholding
Common Stock
-7,673$78.77$604k57,758Mar 19, 2026
Mar 10, 2026Alfred P West Jr
Executive Chairman
SOpen-market sale
Common Stock
-178$78.88$14k6,938,052Mar 12, 2026
Mar 10, 2026Alfred P West Jr
Executive Chairman
SOpen-market sale
Common Stock
-25,391$79.97$2.0M6,912,661Mar 12, 2026
Mar 10, 2026Alfred P West Jr
Executive Chairman
SOpen-market sale
Common Stock
-29,431$80.47$2.4M6,883,230Mar 12, 2026
Mar 11, 2026Alfred P West Jr
Executive Chairman
SOpen-market sale
Common Stock
-6,076$79.11$481k6,877,154Mar 12, 2026
Mar 11, 2026Alfred P West Jr
Executive Chairman
SOpen-market sale
Common Stock
-1,371$79.94$110k6,875,783Mar 12, 2026
Feb 25, 2026Mark Andrew Warner
other
AGrant or award
Common Stock
+2,000$71.12$142k2,921Feb 26, 2026
Feb 25, 2026Mark Andrew Warner
other
AGrant or award
Common Stock
+2,000$71.12$142k4,921Feb 26, 2026
Feb 25, 2026Mark Andrew Warner
other
SOpen-market sale
Common Stock
-4,000$81.74$327k921Feb 26, 2026
Feb 25, 2026Mark Andrew Warner
other
MOption exercise
STOCK OPTION RIGHT TO PURCHASEderivative
-2,000--0Feb 26, 2026
Feb 25, 2026Mark Andrew Warner
other
MOption exercise
STOCK OPTION RIGHT TO PURCHASEderivative
-2,000--0Feb 26, 2026
Jan 29, 2026Ryan Hicke
CHIEF EXECUTIVE OFFICER
MOption exercise
Common Stock
+12,500$71.12$889k209,664Feb 2, 2026
Jan 29, 2026Ryan Hicke
CHIEF EXECUTIVE OFFICER
MOption exercise
Common Stock
+12,500$71.12$889k222,164Feb 2, 2026
Jan 29, 2026Ryan Hicke
CHIEF EXECUTIVE OFFICER
MOption exercise
Common Stock
+17,500$48.47$848k239,664Feb 2, 2026
Jan 29, 2026Ryan Hicke
CHIEF EXECUTIVE OFFICER
MOption exercise
Common Stock
+20,000$64.43$1.3M259,664Feb 2, 2026
Jan 29, 2026Ryan Hicke
CHIEF EXECUTIVE OFFICER
MOption exercise
Common Stock
+17,500$56.54$989k277,164Feb 2, 2026
Jan 29, 2026Ryan Hicke
CHIEF EXECUTIVE OFFICER
SOpen-market sale
Common Stock
-17,009$86.75$1.5M260,155Feb 2, 2026
Jan 29, 2026Ryan Hicke
CHIEF EXECUTIVE OFFICER
SOpen-market sale
Common Stock
-49,937$87.39$4.4M210,218Feb 2, 2026
Jan 29, 2026Ryan Hicke
CHIEF EXECUTIVE OFFICER
SOpen-market sale
Common Stock
-13,054$88.06$1.1M197,164Feb 2, 2026
Jan 29, 2026Ryan Hicke
CHIEF EXECUTIVE OFFICER
MOption exercise
Option to Purchase Common Stockderivative
-12,500--0Feb 2, 2026
Jan 29, 2026Ryan Hicke
CHIEF EXECUTIVE OFFICER
MOption exercise
Option to Purchase Common Stockderivative
-12,500--0Feb 2, 2026
Jan 29, 2026Ryan Hicke
CHIEF EXECUTIVE OFFICER
MOption exercise
Option to Purchase Common Stockderivative
-17,500--0Feb 2, 2026
Jan 29, 2026Ryan Hicke
CHIEF EXECUTIVE OFFICER
MOption exercise
Option to Purchase Common Stockderivative
-20,000--0Feb 2, 2026
Jan 29, 2026Ryan Hicke
CHIEF EXECUTIVE OFFICER
MOption exercise
Option to Purchase Common Stockderivative
-17,500--57,500Feb 2, 2026
Jan 1, 2026Alfred P West Jr
Executive Chairman
FTax withholding
Common Stock
-3,482$82.02$286k6,938,230Jan 2, 2026
Dec 30, 2025Carmen Romeo
director
GGift
COMMON STOCK
-15,500$0.00$01,560,293Dec 30, 2025
Dec 5, 2025Alfred P West Jr
Executive Chairman
FTax withholding
Common Stock
-1,100$81.25$89k6,941,712Dec 29, 2025
Dec 5, 2025Mark Andrew Warner
other
FTax withholding
Common Stock
-379$81.25$31k921Dec 29, 2025
Dec 5, 2025Michael Peterson
EXECUTIVE VICE PRESIDENT
FTax withholding
Common Stock
-1,063$81.25$86k20,148Dec 29, 2025
Dec 5, 2025Philip McCabe
See Remarks
FTax withholding
Common Stock
-1,094$81.25$89k69,884Dec 29, 2025
Dec 5, 2025Kathryn McCarthy
director
FTax withholding
Common Stock
-24$81.25$1,95077,883Dec 29, 2025
Dec 22, 2025William Doran
director
SOpen-market sale
Common Stock
-7,000$83.85$587k623,802Dec 23, 2025
Dec 12, 2025Jonathan Brassington
director
AGrant or award
Common Stock
+2,266--6,207Dec 16, 2025
Dec 12, 2025William Doran
director
AGrant or award
Common Stock
+2,266--630,802Dec 16, 2025
Dec 12, 2025Sean Denham
Executive Vice President, CFO
AGrant or award
Common Stock
+13,254--65,431Dec 16, 2025
50 of 188 rows shown.

Insiders

Everyone who has filed a Form 4 here.

Questions about SEIC

Answered from the filings on this page, as of the latest one.

Are insiders buying SEIC?

As of Oct 1, 2026, SEC Form 4 filings show 0 open-market buys worth $0 by 0 insiders and 5 open-market sells worth $13M by 5 insiders at SEI INVESTMENTS CO in the last 90 days, net -$13M. Only purchases (code P) and sales (code S) count; grants, option exercises and tax withholding do not.

Who was the last insider to trade SEIC on the open market?

Alfred P West Jr (Executive Chairman) sold $3.5M of SEIC on Sep 29, 2026 and filed the Form 4 on Oct 1, 2026. InsiderTell scored 41 (moderate), with 2 insiders on the same side within 14 days.

How many insiders file Form 4 at SEI INVESTMENTS CO?

13 people have filed a Form 4 at SEI INVESTMENTS CO, among them Jonathan Brassington (director), William Doran (director), Sean Denham (Executive VP, CFO, COO). Officers, directors and holders of more than 10% of a share class must report their trades within two business days.

Not investment advice. Scores and forward returns are decision support built from public SEC filings and past prices; they describe what happened after comparable filings, not what will happen after this one. Do your own research and size your risk.

SEIC insider trading: SEI INVESTMENTS CO | InsiderTell