Two years after insider trading allegations hit hedge fund Diamondback Capital Management, the Stamford, Connecticut–based investment firm is set to shutter its operations after clients sought to withdraw $526 million in capital.

Diamondback cofounders Richard Schimel and Larry Sapanski wrote a letter to investors informing them of their decision to close the fund and return cash over the next month. The New York Times reports that the $520 million in redemptions amounted to 26 percent of Diamondback’s assets.