Synopsys, a semiconductor software maker, announced a two-for-one stock split Wednesday. Investors of record as of Sept. 2 will receive one share of Synopsys common stock for every share they hold. Shares of Synopsys will be distributed on Sept. 23. The company, based in Mountain View, Calif., develops electronic design automation software for semiconductor design. The company's stock closed down 81 cents, or 1.17 percent, at $68.19 at the end of the regular trading session Wednesday.