Check out the companies making headlines after the bell:
Shares of Teva Pharmaceutical gained 4 percent in the extended session after a regulatory filing from Berkshire Hathaway published Tuesday revealed it has nearly doubled its stake in the company during the first quarter.
Warren Buffett's Berkshire also reported a larger stake in Monsanto. Shares of the agricultural product giant gained modestly in after-hours trade.
Hedge fund manager Stanley Druckenmiller's firm also initiated positions in a number of semiconductor stocks including Intel, Micron Technology and Qualcomm, according to a regulatory filing released Tuesday.
Shares of Micron rose slightly in late trading, while Intel and Qualcomm stocks were little changed.
Party City stock dropped 2 percent post-market after announcing a secondary offering of 12 million shares of common stock.
Arbor Realty Trust shares plunged 5 percent in after-hours trading after the mortgage lender announced a public offering of common stock.