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Stock Repurchase Program | 12 Months Ended
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Dec. 31, 2017
Stock Repurchase Program | S. STOCK REPURCHASE PROGRAM In January 2015, Teradyne’s Board of Directors cancelled the November 2010 stock repurchase program and authorized a new stock repurchase program for up to $500 million of common stock. In 2015, Teradyne repurchased 15.6 million shares of common stock at an average price of $19.20, for a total cost of $300 million. In 2016, Teradyne repurchased 6.8 million shares of common stock at an average price of $21.39, for a total cost of $146 million. The cumulative repurchases as of December 31, 2016 totaled 22.5 million shares of common stock for $446 million at an average price per share of $19.87. In December 2016, Teradyne’s Board of Directors cancelled the January 2015 stock repurchase program and approved a new $500 million share repurchase authorization which commenced on January 1, 2017. The cumulative repurchases as of December 31, 2017 totaled 5.8 million shares of common stock for $200 million at an average price per share of $34.30.

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