Marshall Wace’s Select Medical SEM Stock Holding History

Marshall Wace’s Portfolio SEM Stock Details SEM Fund Activity

Bought

Maintained

Sold

Quarter	Market Value	Status	Shares	Change in Stake	Trade Value	Portfolio Weight	Portfolio Position
2026 Q2	$472K	Buy	+28,591	New	+$471K	﹤0.01%	2548
2026 Q1	–	Sell	-24,000	Closed	-$356K	–	3633
2025 Q4	$356K	Buy	+24,000	New	+$339K	﹤0.01%	2386
2025 Q3	–	Sell	-134,832	Closed	-$2.05M	–	3348
2025 Q2	$2.05M	Buy	134,832 +99,639	+283%	+$1.55M	﹤0.01%	1558
2025 Q1	$588K	Buy	+35,193	New	+$648K	﹤0.01%	2020
2024 Q2	–	Sell	-521,107	Closed	-$8.47M	–	2911
2024 Q1	$8.47M	Sell	521,107 -460,422	-47%	-$6.74M	0.01%	802
2023 Q4	$12.4M	Buy	981,529 +185,769	+23%	+$2.34M	0.02%	623
2023 Q3	$10.8M	Buy	795,760 +468,909	+143%	+$7.24M	0.02%	627
2023 Q2	$5.61M	Buy	+326,851	New	+$5.06M	0.01%	965
2021 Q3	–	Sell	-85,679	Closed	-$1.95M	–	3376
2021 Q2	$1.95M	Sell	85,679 -380,266	-82%	-$7.89M	0.01%	1442
2021 Q1	$8.56M	Buy	+465,945	New	+$7.64M	0.04%	540
2020 Q4	–	Sell	-84,676	Closed	-$950K	–	2139
2020 Q3	$950K	Buy	+84,676	New	+$834K	0.01%	1044
2019 Q4	–	Sell	-1,158,898	Closed	-$10.3M	–	2020
2019 Q3	$10.3M	Sell	1,158,898 -665,255	-36%	-$5.82M	0.08%	288
2019 Q2	$15.6M	Sell	1,824,153 -402,962	-18%	-$3.18M	0.13%	188
2019 Q1	$16.9M	Buy	2,227,115 +420,642	+23%	+$3.38M	0.16%	159
2018 Q4	$14.9M	Buy	+1,806,473	New	+$17.3M	0.15%	162
2016 Q3	–	Sell	-2,018,311	Closed	-$11.8M	–	1116
2016 Q2	$11.8M	Buy	2,018,311 +259,996	+15%	+$1.72M	0.1%	220
2016 Q1	$11.2M	Buy	1,758,315 +630,660	+56%	+$3.38M	0.11%	200
2015 Q4	$7.24M	Buy	+1,127,655	New	+$7.05M	0.07%	301
2015 Q3	–	Sell	-110,580	Closed	-$965K	–	1039
2015 Q2	$965K	Buy	+110,580	New	+$929K	0.01%	604
2014 Q4	–	Sell	-163,053	Closed	-$1.06M	–	946
2014 Q3	$1.06M	Sell	163,053 -2,873	-2%	-$22.2K	0.02%	546
2014 Q2	$1.4M	Buy	165,926 +47,239	+40%	+$366K	0.02%	452
2014 Q1	$796K	Buy	+118,687	New	+$720K	0.01%	522

Other funds holding SEM

BlackRock New York $6.73T AUM 46.02% 1-Year Est. Return

Verition Fund Management Greenwich, Connecticut $19.7B AUM 39.39% 1-Year Est. Return

GCL

Glazer Capital LLC New York $4.07B AUM 78.71% 1-Year Est. Return

Dimensional Fund Advisors Austin, Texas $552B AUM 44.19% 1-Year Est. Return

Two Sigma Investments New York $138B AUM 41.87% 1-Year Est. Return

Wells Fargo San Francisco, California $617B AUM 30.33% 1-Year Est. Return

AQR Arbitrage Greenwich, Connecticut $7.02B AUM 31.58% 1-Year Est. Return

Millennium Management New York $276B AUM 44.8% 1-Year Est. Return

DAM

Decagon Asset Management London, United Kingdom $525M AUM 50.51% 1-Year Est. Return

PAMP

Polar Asset Management Partners Toronto, Ontario, Canada $6.07B AUM 34.81% 1-Year Est. Return

Marshall Wace's SEM Position: Q2 2026 in Review

Marshall Wace opened a new position in Select Medical (SEM) in Q2 2026: 28,591 shares worth $472K. The stake represents ﹤0.01% of the portfolio and ranks #2548 among its holdings. This is a return to the name: Marshall Wace previously reported a position in SEM as recently as Q4 2025.

Marshall Wace first reported a position in SEM in Q1 2014 and has held it in 22 quarters since. The position peaked at $16.9M in Q1 2019. 238 funds tracked by Wall St. Rank hold SEM as of Q2 2026.

Marshall Wace held 28,591 shares of Select Medical worth $472K as of Q2 2026.
Select Medical was a new Marshall Wace position in Q2 2026.
Select Medical made up ﹤0.01% of Marshall Wace's portfolio in Q2 2026, its #2548 holding.
Marshall Wace first reported a position in Select Medical in Q1 2014 and has held it in 22 quarters since.
Marshall Wace's Select Medical position peaked at $16.9M in Q1 2019.
238 funds tracked by Wall St. Rank held Select Medical as of Q2 2026.

Based on Marshall Wace's 13F filing for Q2 2026, filed 13 Aug 2026.