SEI Investments Company
US ˙ NasdaqGS ˙ US7841171033

SecuritySEIC / SEI Investments Company
InstitutionInterval Partners, LP
Latest Disclosed Ownership136,227 shares
Latest Disclosed Value $ 10,689,733
Interval Partners, LP ownership in SEIC / SEI Investments Company

On May 15, 2026 - Interval Partners, LP filed a 13F-HR form disclosing ownership of 136,227 shares of SEI Investments Company (US:SEIC) valued at $10,689,733 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 17, 2026 disclosing 184,896 shares of SEI Investments Company. This represents a change in shares of -26.32% during the quarter. The current value of the position is $11,853,111 USD.

Interval Partners, LP 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.

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 136,227 -48,669 -26.32 10,690 -29.52 0.2800
2026-02-17 2025-12-31 13F SEI INVTS COM 784117103 184,896 -19,018 -9.33 15,165 -12.35 0.2715
2025-11-14 2025-09-30 13F SEI INVTS COM 784117103 203,914 -25,839 -11.25 17,302 -16.19 0.2824
2025-08-14 2025-06-30 13F SEI INVTS COM 784117103 229,753 -22,438 -8.90 20,646 5.46 0.3502
2025-05-15 2025-03-31 13F SEI INVTS COM 784117103 252,191 52,718 26.43 19,578 18.99 0.4106
2025-02-14 2024-12-31 13F SEI INVTS COM 784117103 199,473 -41,769 -17.31 16,453 -1.43 0.3230
2024-11-14 2024-09-30 13F SEI INVTS COM 784117103 241,242 41,012 20.48 16,692 28.87 0.3749
2024-08-14 2024-06-30 13F SEI INVTS COM 784117103 200,230 -804 -0.40 12,953 -10.39 0.2823
2024-05-15 2024-03-31 13F SEI INVTS COM 784117103 201,034 18,787 10.31 14,454 24.81 0.4050
2024-02-14 2023-12-31 13F SEI INVTS COM 784117103 182,247 4,865 2.74 11,582 8.41 0.3305
2023-11-14 2023-09-30 13F SEI INVTS COM 784117103 177,382 167,368 1,671.34 10,684 1,689.45 0.3212
2023-08-14 2023-06-30 13F SEI INVTS COM 784117103 10,014 -117,000 -92.12 597 -91.83 0.0215
2023-05-15 2023-03-31 13F SEI INVTS COM 784117103 127,014 117,315 1,209.56 7,310 1,193.63 0.2899
2023-02-14 2022-12-31 13F SEI INVTS COM 784117103 9,699 -600 -5.83 565 11.88 0.0336
2022-11-14 2022-09-30 13F SEI INVTS COM 784117103 10,299 0 0.00 505 -9.17 0.0223
2022-08-15 2022-06-30 13F SEI INVTS COM 784117103 10,299 241 2.40 556 -8.25 0.0287
2022-05-16 2022-03-31 13F SEI INVTS COM 784117103 10,058 -21,591 -68.22 606 -68.58 0.0295
2022-02-14 2021-12-31 13F SEI INVTS COM 784117103 31,649 -15,628 -33.06 1,929 -31.21 0.0824
2021-11-15 2021-09-30 13F SEI INVTS COM 784117103 47,277 9,842 26.29 2,804 20.86 0.1134
2021-08-16 2021-06-30 13F SEI INVTS COM 784117103 37,435 -97,849 -72.33 2,320 -71.85 0.0958
2021-05-17 2021-03-31 13F SEI INVTS COM 784117103 135,284 14,381 11.89 8,243 18.64 0.3183
2021-02-25 2020-12-31 13F/A-1 SEI INVTS COM 784117103 120,903 54,778 82.84 6,948 107.16 0.2916
2021-02-16 2020-12-31 13F SEI INVTS COM 784117103 125,329 59,204 6,218 260,871.1704
2020-11-16 2020-09-30 13F SEI INVTS COM 784117103 66,125 66,125 3,354 0.1886
2018-02-14 2017-12-31 13F SEI INVESTMENTS COM 784117103 0 -41,365 -100.00 0 -100.00
2017-11-14 2017-09-30 13F SEI INVESTMENTS COM 784117103 41,365 -4,635 -10.08 2,526 2.10 0.1151
2017-08-14 2017-06-30 13F SEI INVESTMENTS COM 784117103 46,000 46,000 2,474 0.1081
2016-05-16 2016-03-31 13F SEI INVESTMENTS COM 784117103 0 -46,056 -100.00 0 -100.00
2016-02-16 2015-12-31 13F SEI INVESTMENTS COM 784117103 46,056 -6,987 -13.17 2,413 -5.67 0.2282
2015-11-13 2015-09-30 13F SEI INVESTMENTS COM 784117103 53,043 -59,916 -53.04 2,558 -53.81 0.3253
2015-08-14 2015-06-30 13F SEI INVESTMENTS COM 784117103 112,959 2,426 2.19 5,538 13.65 0.5935
2015-05-15 2015-03-31 13F SEI INVESTMENTS COM 784117103 110,533 3,059 2.85 4,873 13.25 0.6109
2015-02-17 2014-12-31 13F SEI INVESTMENTS COM 784117103 107,474 -5,126 -4.55 4,303 5.67 0.6509
2014-11-14 2014-09-30 13F SEI INVESTMENTS COM 784117103 112,600 38,600 52.16 4,072 67.92 0.8526
2014-08-14 2014-06-30 13F SEI INVESTMENTS COM 784117103 74,000 74,000 2,425 0.5583
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
(%)
2026-05-15 2026-03-31 13F SEI INVTS COM Put 36,600 2,872 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.