Jane Street’s Perma-Fix Environmental Services PESI Stock Holding History

Jane Street’s Portfolio PESI Stock Details PESI Fund Activity

Bought

Maintained

Sold

Quarter	Market Value	Status	Shares	Change in Stake	Trade Value	Portfolio Weight	Portfolio Position
2026 Q1	$305K	Sell	28,525 -115,714	-80%	-$1.59M	﹤0.01%	9202
2025 Q4	$1.82M	Buy	144,239 +86,038	+148%	+$1.1M	﹤0.01%	4987
2025 Q3	$588K	Buy	58,201 +36,142	+164%	+$399K	﹤0.01%	7505
2025 Q2	$232K	Buy	+22,059	New	+$203K	﹤0.01%	8305
2024 Q4	–	Sell	-12,159	Closed	-$149K	–	10264
2024 Q3	$149K	Buy	+12,159	New	+$130K	﹤0.01%	8820
2024 Q2	–	Sell	-20,103	Closed	-$239K	–	9984
2024 Q1	$239K	Buy	20,103 +8,580	+74%	+$74.1K	﹤0.01%	7918
2023 Q4	$90.6K	Buy	+11,523	New	+$97.4K	﹤0.01%	8619
2023 Q2	–	Sell	-30,669	Closed	-$361K	–	9353
2023 Q1	$361K	Buy	+30,669	New	+$200K	﹤0.01%	6878
2013 Q3	–	Sell	-2,340	Closed	-$4K	–	3009
2013 Q2	$4K	Buy	+2,340	New	+$8.22K	﹤0.01%	2608

Other funds holding PESI

BlackRock New York $5.72T AUM 30.48% 1-Year Est. Return

MCO

MAK Capital One New York $679M AUM 29.02% 1-Year Est. Return

PGCM

Prescott Group Capital Management Tulsa, Oklahoma $1B AUM 51.95% 1-Year Est. Return

VCM

Vanguard Capital Management Malvern, Pennsylvania $4.04T AUM

Geode Capital Management Boston, Massachusetts $1.61T AUM 30.72% 1-Year Est. Return

Heartland Advisors Milwaukee, Wisconsin $1.96B AUM 28.26% 1-Year Est. Return

Diamond Hill Capital Management Columbus, Ohio $16B AUM 4.15% 1-Year Est. Return

State Street Boston, Massachusetts $2.9T AUM 29.55% 1-Year Est. Return

PCM

Potomac Capital Management New York $115M AUM

Group One Trading Chicago, Illinois $52.2B AUM 104.56% 1-Year Est. Return

Jane Street's PESI Position: Q1 2026 in Review

Jane Street reduced its Perma-Fix Environmental Services (PESI) stake by 80% in Q1 2026, selling an estimated $1.59M and leaving 28,525 shares worth $305K. The position accounts for ﹤0.01% of the portfolio, ranked #9202.

Jane Street first reported a position in PESI in Q2 2013 and has held it in 9 quarters since. The position peaked at $1.82M in Q4 2025. 85 funds tracked by Wall St. Rank hold PESI as of Q1 2026.

Jane Street held 28,525 shares of Perma-Fix Environmental Services worth $305K as of Q1 2026.
Jane Street sold 115,714 Perma-Fix Environmental Services shares in Q1 2026, an estimated $1.59M.
Perma-Fix Environmental Services made up ﹤0.01% of Jane Street's portfolio in Q1 2026, its #9202 holding.
Jane Street first reported a position in Perma-Fix Environmental Services in Q2 2013 and has held it in 9 quarters since.
Jane Street's Perma-Fix Environmental Services position peaked at $1.82M in Q4 2025.
85 funds tracked by Wall St. Rank held Perma-Fix Environmental Services as of Q1 2026.

Based on Jane Street's 13F filing for Q1 2026, filed 12 May 2026.