Atom Investors’s Select Medical SEM Stock Holding History

Atom Investors’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	$459K	Sell	27,779 -108,636	-80%	-$1.79M	0.04%	580
2026 Q1	$2.22M	Sell	136,415 -117,277	-46%	-$1.84M	0.16%	218
2025 Q4	$3.77M	Buy	253,692 +185,184	+270%	+$2.62M	0.3%	116
2025 Q3	$880K	Buy	+68,508	New	+$913K	0.07%	271
2024 Q3	–	Sell	-12,287	Closed	-$232K	–	589
2024 Q2	$232K	Buy	+12,287	New	+$210K	0.02%	408
2023 Q4	–	Sell	-37,341	Closed	-$508K	–	539
2023 Q3	$508K	Buy	+37,341	New	+$577K	0.12%	226
2021 Q4	–	Sell	-23,690	Closed	-$462K	–	385
2021 Q3	$462K	Buy	+23,690	New	+$470K	0.04%	206
2021 Q2	–	Sell	-22,524	Closed	-$414K	–	322
2021 Q1	$414K	Buy	22,524 +5,516	+32%	+$90.4K	0.07%	165
2020 Q4	$253K	Buy	+17,008	New	+$222K	0.03%	289
2019 Q1	–	Sell	-95,398	Closed	-$789K	–	688
2018 Q4	$789K	Buy	+95,398	New	+$913K	0.08%	375

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

Atom Investors's SEM Position: Q2 2026 in Review

Atom Investors reduced its Select Medical (SEM) stake by 80% in Q2 2026, selling an estimated $1.79M and leaving 27,779 shares worth $459K. The position accounts for 0.04% of the portfolio, ranked #580.

Atom Investors first reported a position in SEM in Q4 2018 and has held it in 10 quarters since. The position peaked at $3.77M in Q4 2025. 238 funds tracked by Wall St. Rank hold SEM as of Q2 2026.

Atom Investors held 27,779 shares of Select Medical worth $459K as of Q2 2026.
Atom Investors sold 108,636 Select Medical shares in Q2 2026, an estimated $1.79M.
Select Medical made up 0.04% of Atom Investors's portfolio in Q2 2026, its #580 holding.
Atom Investors first reported a position in Select Medical in Q4 2018 and has held it in 10 quarters since.
Atom Investors's Select Medical position peaked at $3.77M in Q4 2025.
238 funds tracked by Wall St. Rank held Select Medical as of Q2 2026.

Based on Atom Investors's 13F filing for Q2 2026, filed 14 Aug 2026.