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SEIC · Sei Investments Co

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$110.75 +1.22 (+1.11%) At close · Aug 24
Market Cap
$13.29B
Shares
120.02M

Institutional ownership from SEC Form 13F filings. Investment managers with more than $100 million in U.S. equities must disclose their positions every quarter, within 45 days of quarter-end, so the holdings shown can lag the market by up to a quarter.

Holders: 571
Total Value: $7,947,894,467
Total Shares: 90,622,024

Institutional Ownership Trend

26 quarters

Holder Concentration

Across 571 13F filers · Δ vs Mar 31, 2026
Top Holder
11.0%
Sep 2023 → Jun 2026 · range 11.0% – 14.3%
−1.0 pts
Top 5
37.0%
Sep 2023 → Jun 2026 · range 37.0% – 51.0%
−3.0 pts
Top 10
54.2%
Sep 2023 → Jun 2026 · range 54.0% – 62.9%
+0.1 pts
HHI
399
Sep 2023 → Jun 2026 · range 399 – 624
Broadly held−33

Quarterly Activity

vs Mar 31, 2026
New
85
Increased
170
Decreased
221
Sold Out
73
Unchanged
95
Holder count: +12
Institutional value: +19.6%
Shares held: +7.0%

Top Buyers

vs Mar 31, 2026
Institution Added Now Holds Open

Top Sellers

vs Mar 31, 2026
Institution Sold Now Holds Open

Top New Positions

vs Mar 31, 2026
Institution Acquired Value (USD) Open

Top Sold-Out Positions

vs Mar 31, 2026
Institution Previously Held Last Value (USD) Open
Showing 100 of 578
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Holder Value (USD) % of 13F Shares Open
Key facts CIK 350894 CUSIP 784117103 13F (30d) 490 filings 455 filers Visit website Investor relations