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Notice of Proposed Sale · 144

SEI Investments Company

SEICNASDAQEQUITYCurrent

Notice of Proposed Sale

Filed Sep 29, 2026Accepted Sep 29, 2026, 4:10 PM EDTFiling CIK 1059374Accession 0001968582-26-001019
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Structured filing — 144

primary_doc.xml

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Notice of proposed sale. The proposed amounts below do not establish that a sale occurred.

Proposed-sale notice

Issuer
SEI Investments Company
Issuer CIK
0000350894
SEC file number
000-10200
Phone
610-676-1000
Person for whose account securities are to be sold
Alfred P. West, Jr.
Relationships to issuer
Affiliate
Street
1 Freedom Valley Drive
City
Oaks
State / country code
PA
Postal code
19456

Securities proposed for sale

Securities proposed for sale · 1 reported row
SecurityProposed unitsAggregate market valueUnits outstandingApproximate sale dateExchangeBroker / market maker
Common Stock35,0003,668,700120,019,18209/29/2026NASDAQJ.P. Morgan Securities LLC

Broker / market maker — proposed row 1, entry 1

Name
J.P. Morgan Securities LLC
Street
270 Park Avenue, 10th Floor
City
New York
State / country code
NY
Postal code
10017

Acquisition of securities to be sold

Acquisition of securities to be sold · 1 reported row
SecurityAcquiredNature of acquisitionAcquired fromAmount acquiredGift transactionPayment dateNature of payment
Common Stock11/01/2019Private TransactionIssuer35,000N11/01/2019N/A

Sales reported in the preceding three months

Sales reported in the preceding three months · 2 reported rows
SellerSecuritySale dateAmount soldGross proceeds
Alfred P. West JrCommon06/28/202650,0004,359,685.13
Alfred P. West JrCommon06/29/20267,332640,741.28

Seller — prior-sale row 1, entry 1

Name
Alfred P. West Jr
Street
Care of SEI Investments Company
Street (continued)
1 Freedom Valley Drive
City
Oaks
State / country code
PA
Postal code
19456

Seller — prior-sale row 2, entry 1

Name
Alfred P. West Jr
Street
Care of SEI Investments Company
Street (continued)
1 Freedom Valley Drive
City
Oaks
State / country code
PA
Postal code
19456

Prior-sale reporting

Nothing to report for the preceding three months
N

Notice signature

Notice date
09/29/2026
Signed
J.P. Morgan Securities LLC as agent and attorney-in-fact for Alfred P. West, Jr.

Company context

Current securities

Recent company filings

  1. 144 filingSep 22, 2026
  2. 144 filingSep 3, 2026
  3. 144 filingSep 1, 2026
  4. 4 filingSep 1, 2026
  5. 144 filingAug 28, 2026

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