Ken Griffin’s Citadel and Steve Cohen’s Point72 Asset Management posted gains last month as multistrategy hedge funds capitalized on a rebound in markets. Citadel rose 3.6 percent in its Wellington hedge fund and Point72 jumped about 3 percent, according to people familiar with the matter. Balyasny Asset Management, run by Dmitry Balyasny, saw its Atlas Enhanced Fund jump 3.4 percent, rebounding from a 7.1 percent loss last year. Multistrategy funds, which trade across assets from company stocks and bonds to currencies and interest rates, took advantage of a stronger trading environment, pivoting from last quarter’s market tumult.