THE OFFER: ASML Holding NV, the Dutch chip-making equipment supplier, bid $2.55 billion for California company Cymer Inc.
THE TARGET: Cymer's technology makes focused beams of light. Its shares rocketed higher Wednesday.
THE ACQUIRER: ASML uses such beams in machines to trace out the circuits of computer chips. Its customers include Intel, Samsung and Taiwan Semiconductor Manufacturing, all of whom own stakes in ASML.