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3 trades on hedge-fund holdings

After closely followed hedge funds disclosed their holdings on Friday, one purchase in particular looked "really interesting" to "Fast Money" trader Dan Nathan.

David Einhorn's Greenlight Capital increased its stake in struggling chipmaker Micron by more than 10 percent after trimming its position in some recent quarters. Mircron has shed more than 50 percent of its value this year.

Hertz—a stock in which Einhorn holds more than 5 million shares—also looks ripe for a possible move after dipping more than 25 percent this year, trader Guy Adami added.

"Hertz might be the most interesting for a trade," he said.

Read MoreBuffett's Berkshire teases new purchase in filing

Adami contended that Twitter is "extraordinarily valuable" even though its stock has been battered amid leadership and growth uncertainty. He also noted that Facebook endured struggles in its early years as a public company before becoming a Wall Street darling.

Disclosures:

Dan Nathan

Dan is long QQQ sept put, JOY sept calls, TWTR, TWTR sept call spreads, BA sept put spread, COST aug put spread, TJX aug put, SLB aug 28th put spread, MSFT Aug / Nov put spread, GOOGL Sept put spread.

Guy Adami

Guy Adami is long CELG, EXAS, INTC, Guy Adami's wife, Linda Snow, works at Merck.