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MILLENNIUM MANAGEMENT LLC

Position in SEIC — Sei Investments Co

CIK 1273087 NEW YORK, NY

Position in SEIC

as of Jun 30, 2026 · filed Aug 14, 2026
Position Value
$23,349,893
+$14,030,404 QoQ
Shares Held
266,217
+124.2% QoQ
Ownership
0.222%
of shares outstanding
% of Portfolio
0.02%
of 13F equity value
Holder Rank
#51
of 569 holders
Holding Since
Mar 2020
25 quarters on record
Voting authority Sole 100% Shared 0% None 0%

Common Shares in SEIC Over Time

Shares Held

Position Value (USD)

Derivatives in SEIC

reported options exposure · as of Mar 31, 2022
CallValue
$0
CallShares
0
PutValue
$7,225,200
PutShares
120,000

Notional value of option positions as reported on Form 13F. Calls and puts are disclosed separately and do not net against the common-share stake above.

Position in Asset Management

Financial Services · as of Jun 30, 2026

MILLENNIUM MANAGEMENT LLC holds $3,052,785,682 across 93 Asset Management names. SEIC ranks #20 (0.8% of the industry book) .

# Ticker Company Shares Value (USD) Open
7
3,414,602 $177,388,573

All Filings in SEIC

Export CSV
26 filing rows on record
Report Date Value (USD) Shares
2026-06-30 $23,349,893 266,217
2026-03-31 $9,319,489 118,765
2025-12-31 $30,481,502 371,635
2025-09-30 $55,635,211 655,689
2025-06-30 $52,247,659 581,434
2025-03-31 $60,832,342 783,619
2024-12-31 $14,711,710 178,367
2024-09-30 $28,362,849 409,927
2024-06-30 $12,445,579 192,388
2024-03-31 $20,650,542 287,212
2023-12-31 $36,572,071 575,485
2023-09-30 $34,104,996 566,246
2023-06-30 $47,313,895 793,591
2023-03-31 $2,578,873 44,811
2022-09-30 $644,026 13,130
2022-06-30 $39,005,681 722,060
2022-03-31 $37,061,241 615,533
2022-03-31 $7,225,200 120,000
2021-12-31 $60,678,018 995,701
2021-09-30 $45,872,048 773,559
2021-06-30 $21,375,250 344,929
2021-03-31 $16,275,195 267,113
2020-12-31 $42,037,178 731,463
2020-09-30 $17,011,031 335,391
2020-06-30 $22,754,297 413,865
2020-03-31 $29,768,259 642,388