Shares of Coherent Inc. /zigman2/quotes/210489432/composite COHR -0.49% rose 0.8% in premarket trading Tuesday, after the laser technology company after Lumentum Holdings Inc. /zigman2/quotes/204419752/composite LITE +0.99% proposed a higher buyout bid, which would top the latest unsolicited bid from II-VI Inc. /zigman2/quotes/202572630/composite IIVI +1.11% , which Coherent deemed was "superior" to the previously agreed upon bid from Lumentum. Shares of Lumentum dropped 1.9% ahead of the open, while II-VI stock inched up 0.1%. Under terms of the revised bid, Coherent shareholders will get $230 in cash and 0.6724 Lumentum shares for each Coherent share they own. Based on Monday's closing prices, the bid terms values Coherent shares at $287.50 each. That implies a $7.03 billion market capitalization for Coherent. The latest bid from II-VI valued Coherent stock at $286.785 each, and implied a market cap of $7.01 billion. Coherent said it will review Lumentum's new bid in comparison with II-VI's bid. Coherent's stock has soared 72.3% year to date through Monday, while Lumentum shares have shed 9.8% and the S&P 500 /zigman2/quotes/210599714/realtime SPX +0.08% has gained 4.9%.