Check out which companies are making headlines before the bell:
Apple — Cybersecurity firm Palo Alto Networks said hackers executed the first-ever ransomware attack against users of the company's Macintosh computers this weekend.
Mentor Graphics — Investor Carl Icahn cut his stake in the maker of electronic hardware and software design solutions.
Walt Disney — Disney's "Zootopia" topped the weekend box office, garnering $73.7 million in North American ticket sales. That marks the company's fourth biggest March opening weekend on record.
Amazon.com — Amazon will restore the encryption feature on its Fire tablets, reversing an earlier decision to remove the security option. The move follows criticism from customers and others.
Yahoo — Yahoo will face an increasing battle with activist investor Starboard Value, according to Reuters, which said Starboard will push for control of the board in talks scheduled for this week. (Disclosure: CNBC has a content-sharing partnership withYahoo's finance site.)
AT&T — AT&T is in the midst of a rate dispute with Spanish language channel Univision, which has resulted in the channel being blacked out for customers of AT&T's U-Verse pay-TV service.
United Continental — The airline's Chief Executive Officer Oscar Munoz will return to his job from medical leave March 14, after recovering from a heart transplant operation.
Seagate Technology — Seagate employees were hit by a phishing attack that exposed their W-2 information. The disk drive maker said it immediately informed the Internal Revenue Service of the issue and is giving employees two-year memberships in Experian's ProtectMyID service.
Reynolds American — Reynolds may be the target of a takeover attempt by British American Tobacco, according to the Sunday Telegraph. BAT already owns a stake in the tobacco producer.
UBS — The bank has won the business of miner BHP Billiton from Bank of America, and poached Coca-Cola from JPMorgan Chase, according to a report in London's Sunday Times.
Marvell Technology — Marvell is open to selling itself, according to a report in the New York Post, with Avago Technologies mentioned as a possible buyer.
DuPont — BASF is considering a bid for DuPont, according to Bloomberg. DuPont already has an agreement in place to merge with Dow Chemical.
Dunkin' Brands — The stock was downgraded to "neutral" from "buy" at Guggeheim, with the firm seeing fewer potential upside drivers for earnings in the near term.
GlaxoSmithKline — The drug maker said its already approved Nucala asthma drug maintained its safety and effectiveness profiles over longer terms than had been previously studied.
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