Citadel Investment Group LLC, the $13 billion hedge-fund firm run by Kenneth Griffin, plans to allow clients to make withdrawals from its two largest funds after freezing them last year.

Citadel will decide each quarter whether to make payments from its Wellington and Kensington funds, Griffin said in an investor letter yesterday. Clients will be notified of amounts available for redemption.

In the letter, a copy of which was obtained by Bloomberg News, Griffin said the firm had “significantly” cut its holdings in hard-to-sell assets.

A record number of funds, including Citadel and Fortress Investment Group LLC, limited client withdrawals last year, angering investors who wanted to exit as the industry produced its worst annual performance on record. Citadel in December limited investor withdrawals and said redemptions may resume as early as March 31.