Lumentum Holdings Inc. /zigman2/quotes/204419752/composite LITE -0.59% said Monday it received notice from laser technology company Coherent Inc. /zigman2/quotes/210489432/composite COHR +1.26% , which Lumentum has entered into an agreement to acquire, that the unsolicited buyout bid it received from II-VI Inc. /zigman2/quotes/202572630/composite IIVI -2.43% was "superior." Lumentum said it will review the II-VI bid, and will have four days to match the rival bid. if the Lumentum-Coherent merger agreement is terminated, Coherent will be required to pay a $217.6 million termination fee. On Feb. 12, II-VI made a $260-per-share cash-and-stock bid to buy Coherent, valuing the company at the time at $6.36 billion, while the cash-and-stock merger agreement with Lumentum announced on Jan. 19 was valued at $5.7 billion. Lumentum's stock gained 0.1% in premarket trading while Coherent's stock rallied 4.4% and II-VI share shed 2.8%. Meanwhile, futures /zigman2/quotes/209948968/delayed ES00 -0.46% for the S&P 500 /zigman2/quotes/210599714/realtime SPX -0.54% fell 0.5%.