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 Q2	$667K	Buy	46,651 +18,126	+64%	+$202K	﹤0.01%	7387
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 $6.73T AUM 46.02% 1-Year Est. Return

MCO

MAK Capital One New York $714M AUM 68.07% 1-Year Est. Return

Vanguard Capital Management Malvern, Pennsylvania $4.68T AUM

PGCM

Prescott Group Capital Management Tulsa, Oklahoma $1.16B AUM 53.61% 1-Year Est. Return

Diamond Hill Capital Management Columbus, Ohio $12.5B AUM 7.49% 1-Year Est. Return

KCM

Kennedy Capital Management St Louis, Missouri $5.65B AUM 61.31% 1-Year Est. Return

PCM

Potomac Capital Management New York $147M AUM

Geode Capital Management Boston, Massachusetts $1.88T AUM 44.46% 1-Year Est. Return

Heartland Advisors Milwaukee, Wisconsin $2.25B AUM 44.61% 1-Year Est. Return

State Street Boston, Massachusetts $3.37T AUM 44.26% 1-Year Est. Return

Jane Street's PESI Position: Q2 2026 in Review

Jane Street increased its Perma-Fix Environmental Services (PESI) stake by 64% in Q2 2026, buying an estimated $202K and bringing the position to 46,651 shares worth $667K. The position accounts for ﹤0.01% of the portfolio, ranked #7387.

Jane Street first reported a position in PESI in Q2 2013 and has held it in 10 quarters since. The position peaked at $1.82M in Q4 2025. 89 funds tracked by Wall St. Rank hold PESI as of Q2 2026.

Jane Street held 46,651 shares of Perma-Fix Environmental Services worth $667K as of Q2 2026.
Jane Street bought 18,126 Perma-Fix Environmental Services shares in Q2 2026, an estimated $202K.
Perma-Fix Environmental Services made up ﹤0.01% of Jane Street's portfolio in Q2 2026, its #7387 holding.
Jane Street first reported a position in Perma-Fix Environmental Services in Q2 2013 and has held it in 10 quarters since.
Jane Street's Perma-Fix Environmental Services position peaked at $1.82M in Q4 2025.
89 funds tracked by Wall St. Rank held Perma-Fix Environmental Services as of Q2 2026.

Based on Jane Street's 13F filing for Q2 2026, filed 14 Aug 2026.