SEI投資公司
MX ˙ BMV ˙ US7841171033
SecurityMX:SEIC / SEI Investments Company
InstitutionMillennium Management Llc
ManagerIsrael Englander
Latest Disclosed Ownership118,765 shares
Latest Disclosed Value $ 9,319,490
Millennium Management Llc ownership in SEIC / SEI Investments Company

On May 15, 2026 - Millennium Management Llc filed a 13F-HR form disclosing ownership of 118,765 shares of SEI Investments Company (MX:SEIC) valued at $9,319,490 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 17, 2026 disclosing 371,635 shares of SEI Investments Company. This represents a change in shares of -68.04% during the quarter.

Millennium Management Llc has a history of taking positions in derivatives of the underlying security (SEIC) in the form of stock options.

Institutional Ownership: 13F and NPORT Filings

The Security and Class in the table below are shown exactly as filed by the investor. We do our best to track continuity of investments through acquisitions, and this will be reflected in the table as changes in names. In addition to descriptive data, performance of the investment is shown over time. To calculate quarterly performance, we first calculate cost basis of the shares purchased during the quarter, then use that to calculate gross profit. Quarterly return is Gross Profit / Starting Portfolio value.

Note that cost basis is calculated and stored in thousands, so small quarterly changes in shares frequently result in a cost basis of zero.

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Institutional Put/Call Ratios
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In addition to reporting standard equity and debt issues, institutions with more than 100MM assets under management must also disclose their put and call option holdings. Since put options generally indicate negative sentiment, and call options indicate positive sentiment, we can get a sense of the overall institutional sentiment by plotting the ratio of puts to calls. The chart to the right plots the historical put/call ratio for this instrument.

Using Put/Call Ratio as an indicator of investor sentiment overcomes one of the key deficiencies of using total institutional ownership, which is that a significant amount of assets under management are invested passively to track indices. Passively-managed funds do not typically buy options, so the put/call ratio indicator more closely tracks the sentiment of actively-managed funds.

MX:SEIC / SEI Investments Company Historical Put/Call Ratio
Disclosed Equity Positions (from 13F/NPORT Filings)
File
Date
Effective
Date
Form Security Class ID Avg Price
Paid (Est)
Reported
Shares
ΔShares ΔShares
(%)
Reported
Value
(x1000)
ΔValue
(%)
Alloc
(%)
ΔAlloc ΔAlloc (%) Cost Basis
(x1000)
Unrealized
Gain/Loss
(x1000)
2026-05-15 2026-03-31 13F SEI INVTS COM 784117103 118,765 -252,870 -68.04 9,319 -69.43 0.0039
2026-02-17 2025-12-31 13F SEI INVTS COM 784117103 371,635 -284,054 -43.32 30,482 -45.21 0.0128
2025-11-14 2025-09-30 13F SEI INVTS COM 784117103 655,689 74,255 12.77 55,635 6.48 0.0237
2025-08-14 2025-06-30 13F SEI INVTS COM 784117103 581,434 -202,185 -25.80 52,248 -14.11 0.0252
2025-05-15 2025-03-31 13F SEI INVTS COM 784117103 783,619 605,252 339.33 60,832 313.51 0.0324
2025-02-14 2024-12-31 13F SEI INVTS COM 784117103 178,367 -231,560 -56.49 14,712 -48.13 0.0072
2024-11-14 2024-09-30 13F SEI INVTS COM 784117103 409,927 217,539 113.07 28,363 127.90 0.0134
2024-08-14 2024-06-30 13F SEI INVTS COM 784117103 192,388 -94,824 -33.02 12,446 -39.73 0.0058
2024-05-15 2024-03-31 13F SEI INVTS COM 784117103 287,212 -288,273 -50.09 20,651 -43.54 0.0088
2024-02-14 2023-12-31 13F SEI INVTS COM 784117103 575,485 9,239 1.63 36,572 7.24 0.0158
2023-11-14 2023-09-30 13F SEI INVTS COM 784117103 566,246 -227,345 -28.65 34,105 -27.92 0.0172
2023-08-14 2023-06-30 13F SEI INVTS COM 784117103 793,591 748,780 1,670.97 47,314 1,734.55 0.0233
2023-05-15 2023-03-31 13F SEI INVTS COM 784117103 44,811 44,811 2,579 0.0015
2023-02-14 2022-12-31 13F SEI INVTS COM 784117103 0 -13,130 -100.00 0 -100.00
2022-11-14 2022-09-30 13F SEI INVTS COM 784117103 13,130 -708,930 -98.18 644 -98.35 0.0004
2022-08-15 2022-06-30 13F SEI INVTS COM 784117103 722,060 106,527 17.31 39,006 5.25 0.0242
2022-05-16 2022-03-31 13F SEI INVTS COM 784117103 615,533 -380,168 -38.18 37,061 -38.92 0.0196
2022-02-14 2021-12-31 13F SEI INVTS COM 784117103 995,701 222,142 28.72 60,678 32.28 0.0308
2021-11-15 2021-09-30 13F SEI INVTS COM 784117103 773,559 428,630 124.27 45,872 114.61 0.0275
2021-08-16 2021-06-30 13F SEI INVTS COM 784117103 344,929 77,816 29.13 21,375 31.34 0.0131
2021-05-17 2021-03-31 13F SEI INVTS COM 784117103 267,113 -464,350 -63.48 16,275 -61.28 0.0116
2021-02-16 2020-12-31 13F SEI INVTS COM 784117103 731,463 396,072 118.09 42,037 147.12 0.0304
2020-11-16 2020-09-30 13F SEI INVTS COM 784117103 335,391 -78,474 -18.96 17,011 -25.24 0.0209
2020-08-14 2020-06-30 13F SEI INVTS COM 784117103 413,865 -228,523 -35.57 22,754 -23.56 0.0312
2020-05-14 2020-03-31 13F SEI INVESTMENTS COM 784117103 642,388 642,388 29,768 0.0669
2020-02-14 2019-12-31 13F SEI INVESTMENTS COM 784117103 0 -313,752 -100.00 0 -100.00
2019-11-14 2019-09-30 13F SEI INVESTMENTS COM 784117103 313,752 60,043 23.67 18,591 30.62 0.0294
2019-08-15 2019-06-30 13F/A-1 SEI INVESTMENTS COM 784117103 253,709 -832,733 -76.65 14,233 -74.93 0.0214
2019-08-14 2019-06-30 13F UMPQUA HLDGS COM 784117103 204,317 -882,125 3,390
2019-05-14 2019-03-31 13F SEI INVESTMENTS COM 784117103 1,086,442 -189,372 -14.84 56,767 -3.69 0.0850
2019-02-15 2018-12-31 13F/A-1 SEI INVESTMENTS COM 784117103 1,275,814 560,833 78.44 58,943 34.93 0.0919
2019-02-14 2018-12-31 13F SEI INVESTMENTS COM 784117103 1,275,814 58,943
2018-11-14 2018-09-30 13F SEI INVESTMENTS COM 784117103 714,981 -122,763 -14.65 43,685 -16.59 0.0535
2018-08-14 2018-06-30 13F SEI INVESTMENTS COM 784117103 837,744 441,285 111.31 52,376 76.36 0.0683
2018-05-15 2018-03-31 13F SEI INVESTMENTS COM 784117103 396,459 396,459 29,699 0.0396
2018-02-14 2017-12-31 13F SEI INVESTMENTS COM 784117103 0 -51,970 -100.00 0 -100.00
2017-11-14 2017-09-30 13F SEI INVESTMENTS COM 784117103 51,970 -537,664 -91.19 3,173 -89.99 0.0048
2017-08-14 2017-06-30 13F SEI INVESTMENTS COM 784117103 589,634 248,113 72.65 31,711 84.09 0.0566
2017-05-15 2017-03-31 13F SEI INVESTMENTS COM 784117103 341,521 10,847 3.28 17,226 5.54 0.0316
2017-02-14 2016-12-31 13F SEI INVESTMENTS COM 784117103 330,674 -171,690 -34.18 16,322 -28.77 0.0342
2016-11-14 2016-09-30 13F SEI INVESTMENTS COM 784117103 502,364 -100,744 -16.70 22,913 -21.03 0.0384
2016-08-15 2016-06-30 13F SEI INVESTMENTS COM 784117103 603,108 561,569 1,351.91 29,016 1,522.82 0.0664
2016-05-16 2016-03-31 13F SEI INVESTMENTS COM 784117103 41,539 35,437 580.74 1,788 458.75 0.0045
2016-02-16 2015-12-31 13F SEI INVESTMENTS COM 784117103 6,102 -74,757 -92.45 320 -91.79 0.0007
2015-11-16 2015-09-30 13F SEI INVESTMENTS COM 784117103 80,859 70,013 645.52 3,900 633.08 0.0076
2015-08-14 2015-06-30 13F SEI INVESTMENTS COM 784117103 10,846 -408,642 -97.41 532 -97.12 0.0010
2015-05-15 2015-03-31 13F SEI INVESTMENTS COM 784117103 419,488 -87,878 -17.32 18,495 -8.96 0.0344
2015-02-17 2014-12-31 13F SEI INVESTMENTS COM 784117103 507,366 -11,307 -2.18 20,315 8.32 0.0430
2014-11-14 2014-09-30 13F SEI INVESTMENTS COM 784117103 518,673 -239,575 -31.60 18,755 -24.52 0.0474
2014-08-14 2014-06-30 13F SEI INVESTMENTS COM 784117103 758,248 -341,643 -31.06 24,848 -32.78 0.0688
2014-05-15 2014-03-31 13F SEI INVESTMENTS COM 784117103 1,099,891 680,901 162.51 36,967 154.03 0.1071
2014-02-14 2013-12-31 13F SEI INVESTMENTS COM 784117103 418,990 147,176 54.15 14,552 73.20 0.0459
2013-11-14 2013-09-30 13F SEI INVESTMENTS COM 784117103 271,814 -147,969 -35.25 8,402 -29.60 0.0271
2013-08-14 2013-06-30 13F SEI INVESTMENTS COM 784117103 419,783 419,783 11,934 0.0366
Disclosed Put Options
File
Date
Effective
Date
Form Security Class ID Opt Avg Share Price Shares ΔShares
(%)
Value
(x1000)
ΔValue
(%)
Prior Allocation
(%)
Allocation
(%)
ΔAllocation
(%)
Cost Basis
(x1000)
Profit
(x1000)
Return
(%)
2022-08-15 2022-06-30 13F SEI INVTS COM Put 0 -100.00 0 -100.00 n/a n/a n/a
2022-05-16 2022-03-31 13F SEI INVTS COM Put 120,000 7,225 n/a n/a n/a
Legend
Shares
The total number of shares held by the institution at the end of the reporting period (the effective date). This is provided in the filing.
Value
The total value of the shares as of the effective date. This is provided in the filing.
Avg. Share Price
The weighted average share price of the shares held by the institution. We use FIFO accounting to determine this price
Class
This is the security class as indicated by the filer. There are a variety of values for this field. Common values include "EC" = equity common, "EP" - equity preferred
Allocation (%)
The percent of the institution's portfolio that this position represents. This is provided in NPORT filings. For 13F filings, we calculate it.
Change in Allocation
The change in allocation from the prior reporting period. This is calculated as current allocation - prior allocation.
Change in Allocation (%)
The percent change in allocation from the prior reporting period. This is calculated as (current allocation - prior allocation) / prior allocation.
Cost Basis
The total cost of the shares held. This is calculated as reported shares * avg. share price
Unrealized Gain/Loss
This is the market value of the position as of the effective date minus the cost basis.