DJ Starboard Value Takes 10.7% Stake in Mellanox Technologies       
        By David Benoit
  Starboard Value LP has taken a 10.7% stake in      Mellanox Technologies Ltd., urging the company to improve its margins and      stock and explore a potential sale, a thesis in part helped by deal talks      at Marvell Technology Group Ltd., where Starboard has a seat.
  Starboard      believes Mellanox is spending too much on research and development and      other corporate expenses to try to grow revenue, sacrificing margins      compared with peers, according to people familiar with the matter. The      activist wants the company to improve its operations and potentially      explore a deal to boost the stock, it confirmed in a filing late Monday.
  A      spokeswoman for Mellanox wasn't immediately available for comment.
  Shares      of the company jumped 5.8% in after-hours trading after the Journal first      reported Starboard's stake and intentions.
  The New York activist      investor has a long record of successful semiconductor investments,      highlighted earlier Monday by Marvell's $6 billion deal for Cavium Inc.,      less than two years after Starboard arrived and the company promptly      ousted its founders. The deal helped send Marvell stock higher, and it has      now returned about 157% since before Starboard arrived in February 2016,      compared with roughly 127% from the iShares Semiconductor exchange-traded      fund.
  Mellanox's stock has dramatically underperformed the same ETF      in recent years. The Israel and Sunnyvale, Calif.,-based company has      returned about 12% in the past year but has lost 38% over the past five      years, both worse than the ETF's 54% and nearly 300% return.
  Marvell      recently approached Mellanox about a potential transaction but was      rebuffed, Starboard said in its filing, a response that helped inform      Starboard's belief that Mellanox was hostile to potential deals, according      to people familiar with the matter. Starboard's Peter Feld is on the board      of Marvell.
  No discussions are ongoing between the sides at this      time, and Mr. Feld has said he would recuse himself from anything that      could happen in the future, Starboard added.
  Mellanox, with a $2.6      billion market value as of Monday's close, specializes in technologies for      high-speed computing and is a leader in the InfiniBand systems that help      power supercomputers, as well as ethernet products. Its high-powered      products are used in the giant data centers that make cloud-computing      possible. Chief Executive Eyal Waldman was a co-founder of the company in      1999.
  Revenue since 2012 has soared, but it hasn't hit the bottom      line as much. In 2016, Mellanox recorded $857.5 million in revenue, up      from $500.3 million in 2012, but spending on research and sales and      marketing combined rose to $456 million from just under $200 million.
  Starboard      has long played in the semiconductors space -- this is the firm's 12th      stake of above 5% in a chip-related company -- and it has typically pushed      for both margin improvement and deal talks.
  That was the case for      Marvell, where the activist arrived as the stock had slumped amid an      accounting probe. Shortly afterward, Marvell's founders were ousted and      Starboard gained board seats that gave the firm a role in selecting the      next CEO. Monday's deal with Cavium is aimed at expanding Marvell's reach      and helping it compete with bigger semiconductors. Starboard is sitting on      investment gains of more than $440 million from that investment, according      to filings.
  The semiconductor space has been rife with deals,      including Broadcom Ltd.'s unsolicited $105 billion attempt to buy Qualcomm      Inc., which itself is trying to close a $39 billion deal to buy NXP      Semiconductors NV. The deals come as technology companies try to push      connectivity and ever-growing information feeds into everything from      phones to cars, trends that rely on powerful, chip-driven computing.
  Analysts      from Benchmark Capital initiated coverage on Mellanox at the end of      August, calling it a "ripe acquisition target for many companies." Though      it listed Marvell as the most "logical" buyer, it also included other      giant chip makers.
  Write to David Benoit at david.benoit@wsj.com
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