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SEIC — SEI INVESTMENTS CO

Financials · Security Brokers, Dealers & Flotation Companies · Nasdaq

CIK 0000350894 · FYE 1231 · All Form 4 filings on EDGAR ↗

Formerly: SEI CORP (until 2004-08-05)

1Insiders filing

3Transactions

+$2.1MReported buys

−$4.2MReported sells

0Cluster events

Window in data: 2026-08-28 → 2026-08-28 · Data as of 2026-09-02

Insiders

Insider	Role	Txns	Reported value
Peterson Michael	Executive Vice President	3	$6.3M

Transaction history

Filing date	Trade date	Ticker	Insider	Type	Shares	Price	Value	Cluster
2026-09-01	2026-08-28	SEIC	Peterson Michael Executive Vice President	M routine	37,500	$56.54	+$2.1M	—
2026-09-01	2026-08-28	SEIC	Peterson Michael Executive Vice President	S	37,500	$111.51	−$4.2M	—
2026-09-01	2026-08-28	SEIC	Peterson Michael Executive Vice President	M routine	37,500	—	—	—

Known data limitations

Form 4 lag: insiders have 2 business days to file after a trade (weekends and holidays extend this), and this site re-ingests once daily — a transaction can appear here roughly three business days after it happened.
13F lag: quarterly 13F-HR holdings cover the prior quarter-end and are due 45 days after it — every institutional position shown here is at least 45 days old by construction, often more.
CUSIP→ticker gaps: 13F positions are reported by CUSIP; some holdings cannot be matched to a current ticker (delistings, corporate actions, thin metadata) and appear without one or are omitted from ticker-level views.
EDGAR timing variability: institutions file at different hours and days within their windows; amended filings (4/A, 13F-HR/A) can restate earlier periods, so historical aggregates may change between batches.

Insider Atlas is a descriptive research site, not investment advice — see the methodology for the full provenance chain.