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Who owns Perma FIX Environmental Services (PESI) stock

87 funds reported Perma FIX Environmental Services (PESI) shares in their latest 13F filings, worth $142M in all. The largest holder is BlackRock ($17.9M). Last quarter 46 funds added to their stakes and 23 cut them.

Largest holders of PESI (13F)Largest holders of PESI (13F)BlackRock$17.9MMAK Capital One LLC$14.8MVanguard Group$12.2MVanguard Capital Management LLC$11.6MDiamond Hill Capital Management$9.2MKennedy Capital Management LLC$8.7MPotomac Capital Management$6.8MGeode Capital Management, LLC$6.5MHeartland Advisors$5.7MState Street$5.0M

Largest holders (13F)

FundSharesValueChangeQuarter
BlackRock1,252,756$17.9Mincrease2026-06-30
MAK Capital One LLC1,032,958$14.8Mincrease2026-06-30
Vanguard Group968,107$12.2Mincrease2025-12-31
Vanguard Capital Management LLC811,743$11.6Mincrease2026-06-30
Diamond Hill Capital Management642,533$9.2Mincrease2026-06-30
Kennedy Capital Management LLC610,903$8.7Mnew2026-06-30
Potomac Capital Management477,000$6.8Mincrease2026-06-30
Geode Capital Management, LLC455,156$6.5Mincrease2026-06-30
Heartland Advisors400,000$5.7Munchanged2026-06-30
State Street349,744$5.0Mincrease2026-06-30
Prescott Group Capital Management, L.L.C.180,492$2.8Mdecrease2026-09-30
Dimensional Fund Advisors LP191,063$2.7Mincrease2026-06-30
Goldman Sachs Group162,755$2.3Mincrease2026-06-30
Susquehanna International Group, LLP156,934$2.2Mincrease2026-06-30
Citadel Advisors LLC152,626$2.2Mincrease2026-06-30

Perma FIX Environmental Services' latest quarter

Perma FIX Environmental Services, Q3 2026: revenue $17.9M (+3% year over year), operating margin -20.4%, net loss $3.5M, operating cash flow −$2.0M. The chart follows the revenue to costs, profit and cash.

Questions

Who owns the most PESI stock?

By the latest 13F filings: BlackRock ($17.9M); MAK Capital One LLC ($14.8M); Vanguard Group ($12.2M); Vanguard Capital Management LLC ($11.6M); Diamond Hill Capital Management ($9.2M).

What is the short interest in PESI?

3,532,643 shares were sold short at the 2026-10-15 settlement, 10.27% of the float.

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Updated Nov 8, 2026. Read automatically from SEC filings and public data; errors are possible. Not investment advice.