Select Medical Holdings Corporation
US ˙ NYSE ˙ US81619Q1058

SecuritySEM / Select Medical Holdings Corporation
InstitutionMarshall Wace, Llp
Latest Disclosed Ownership0 shares
Latest Disclosed Value $ 0
Marshall Wace, Llp closes position in SEM / Select Medical Holdings Corporation

On May 14, 2026 - Marshall Wace, Llp filed a 13F-HR form disclosing ownership of 0 shares of Select Medical Holdings Corporation (US:SEM) valued at $0 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 13, 2026 disclosing 24,000 shares of Select Medical Holdings Corporation. The current value of the position is $0 USD.

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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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)
2026-05-14 2026-03-31 13F SELECT MEDICAL COMMON STOCK 81619Q105 0 -100.00 0
2026-02-13 2025-12-31 13F SELECT MEDICAL COMMON STOCK 81619Q105 24,000 356
2025-11-13 2025-09-30 13F SELECT MEDICAL COMMON STOCK 81619Q105 0 -100.00 0
2025-08-13 2025-06-30 13F SELECT MEDICAL COMMON STOCK 81619Q105 134,832 99,639 283.12 2,047 248.55 0.0023
2025-05-15 2025-03-31 13F SELECT MEDICAL COMMON STOCK 81619Q105 35,193 35,193 588 0.0007
2024-08-14 2024-06-30 13F SELECT MEDICAL COMMON STOCK 81619Q105 0 -280,769 -100.00 0 -100.00
2024-05-15 2024-03-31 13F SELECT MEDICAL COMMON STOCK 81619Q105 280,769 -248,072 -46.91 8,465 -31.88 0.0129
2024-02-14 2023-12-31 13F SELECT MEDICAL COMMON STOCK 81619Q105 528,841 100,091 23.34 12,428 14.70 0.0210
2023-11-14 2023-09-30 13F SELECT MEDICAL COMMON STOCK 81619Q105 428,750 252,645 143.46 10,835 93.12 0.0219
2023-08-14 2023-06-30 13F SELECT MEDICAL COMMON STOCK 81619Q105 176,105 176,105 5,611 0.0110
2021-11-15 2021-09-30 13F SELECT MEDICAL COMMON STOCK 81619Q105 0 -46,163 -100.00 0 -100.00
2021-08-13 2021-06-30 13F SELECT MEDICAL COMMON STOCK 81619Q105 46,163 -204,885 -81.61 1,951 -77.21 0.0095
2021-05-17 2021-03-31 13F SELECT MEDICAL COMMON STOCK 81619Q105 251,048 251,048 443.83 8,561 338.80 0.0393
2021-02-16 2020-12-31 13F SELECT MEDICAL COMMON STOCK 81619Q105 0 -45,623 -100.00 0 -100.00
2020-11-16 2020-09-30 13F SELECT MEDICAL COMMON STOCK 81619Q105 45,623 45,623 950 0.0061
2020-02-14 2019-12-31 13F SELECT MEDICAL COMMON STOCK 81619Q105 0 -624,406 -100.00 0 -100.00
2019-11-14 2019-09-30 13F SELECT MEDICAL COMMON STOCK 81619Q105 624,406 -358,435 -36.47 10,347 -33.66 0.0813
2019-08-14 2019-06-30 13F SELECT MEDICAL COMMON STOCK 81619Q105 982,841 -217,113 -18.09 15,598 -7.74 0.1283
2019-05-29 2019-03-31 13F/A-1 SELECT MEDICAL COMMON STOCK 81619Q105 1,199,954 226,639 23.29 16,907 13.15 0.1589
2019-05-14 2019-03-31 13F SELECT MEDICAL COMMON STOCK 81619Q105 1,199,954 226,639 16,907
2019-02-14 2018-12-31 13F SELECT MEDICAL COMMON STOCK 81619Q105 973,315 973,315 -18.89 14,942 -11.62 0.1525
2016-11-10 2016-09-30 13F SELECT MEDICAL COMMON STOCK 81619Q105 0 -1,087,452 -100.00 0 -100.00
2016-08-12 2016-06-30 13F SELECT MEDICAL COMMON STOCK 81619Q105 1,087,452 140,084 14.79 11,821 5.66 0.0994
2016-05-13 2016-03-31 13F SELECT MEDICAL COMMON STOCK 81619Q105 947,368 339,795 55.93 11,188 54.62 0.1078
2016-02-10 2015-12-31 13F SELECT MEDICAL COMMON STOCK 81619Q105 607,573 607,573 -35.87 7,236 -35.32 0.0679
2015-11-12 2015-09-30 13F SELECT MEDICAL COMMON STOCK 81619Q105 0 -59,580 -100.00 0 -100.00
2015-08-14 2015-06-30 13F SELECT MEDICAL COMMON STOCK 81619Q105 59,580 59,580 0.00 965 0.0126
2015-02-17 2014-12-31 13F SELECT MEDICAL COMMON STOCK 81619Q105 0 -87,852 -100.00 0 -100.00
2014-11-13 2014-09-30 13F SELECT MEDICAL COMMON STOCK 81619Q105 87,852 -1,548 -1.73 1,057 -24.23 0.0152
2014-08-14 2014-06-30 13F SELECT MEDICAL COMMON STOCK 81619Q105 89,400 25,452 39.80 1,395 75.25 0.0205
2014-05-14 2014-03-31 13F SELECT MEDICAL COMMON STOCK 81619Q105 63,948 63,948 796 0.0145
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.