Check out which companies are making headlines after the bell Monday:
CF Industries - Shares climbed 1.3 percent after The Mosaic Co. said it had completed its acquisition of the company's phosphate business for $1.2 billion in cash, along with $200 million to fund its asset retirement obligation escrow.
Towerstream - Shares fell 4.2 percent in extended-hours trading after the Wi-Fi provider posted fourth-quarter results beneath analyst expectations.
Oxygen Biotherapeutics - Shares of the specialty pharmaceutical company fell 7.6 percent in extended-hours trading after it issued a press release announcing its intention to start a public offering of its common stock.
Galena Biopharma - Shares rallied 10 percent in after-hours trading after the company that specializes in oncology treatments reported quarterly results.
—By CNBC's Kate Gibson.
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