The current institutional shareholding score of Perma-Fix Environmental Services Inc is 5.00, ranking 98 out of 161 in the Professional & Commercial Services industry. The latest institutional shareholding proportion is 62.67%, representing a quarter-over-quarter increase of 22.82%. The largest institutional shareholder is Bill Nygren | OAKMX, holding a total of 394.00K shares, representing 1.92% of shares outstanding, with 62.13% decrease in holdings.