X0306 4 2015-01-30 1 0000840883 BTU INTERNATIONAL INC BTUI 0001223907 WANSEM PAUL J VAN DER 597 LOWELL ROAD CONCORD MA 01742 1 1 1 0 Chairman, President and CEO Common Stock 2015-01-30 4 M 0 2500 A 1024900 D Common Stock 2015-01-30 4 D 0 1024900 D 0 D Common Stock 2015-01-30 4 D 0 365000 D 0 I By Family LTP Common Stock 2015-01-30 4 D 0 115000 D 0 I By wife Common Stock 2015-01-30 4 D 0 90344 D 0 I By Family Trust RSU 0.00 2015-01-30 4 D 0 2500 0.00 D 2021-04-28 Common Stock 2500 0 D Options (right to buy) 10.05 2015-01-30 4 D 0 66000 D 2015-05-16 Common Stock 66000 0 D Options (right to buy) 5.01 2015-01-30 4 D 0 33000 D 2015-10-31 Common Stock 33000 0 D Options (right to buy) 3.00 2015-01-30 4 D 0 33000 D 2016-05-15 Common Stock 33000 0 D Options (right to buy) 5.79 2015-01-30 4 D 0 50000 D 2016-10-26 Common Stock 50000 0 D Options (right to buy) 5.38 2015-01-30 4 D 0 35000 D 2017-05-21 Common Stock 35000 0 D Options (right to buy) 6.99 2015-01-30 4 D 0 35000 D 2017-11-01 Common Stock 35000 0 D Options (right to buy) 9.04 2015-01-30 4 D 0 21000 D 2018-05-20 Common Stock 21000 0 D Options (right to buy) 3.56 2015-01-30 4 D 0 21000 D 2018-11-03 Common Stock 21000 0 D Options (right to buy) 3.03 2015-01-30 4 D 0 25000 D 2019-06-04 Common Stock 25000 0 D Options (right to buy) 2.00 2015-01-30 4 D 0 25000 D 2019-11-05 Common Stock 25000 0 D Options (right to buy) 2.35 2015-01-30 4 D 0 12500 D 2020-06-03 Common Stock 12500 0 D Options (right to buy) 3.27 2015-01-30 4 D 0 18000 D 2020-11-04 Common Stock 18000 0 D The restricted stock units convert into common stock on a one-to-one basis. Disposed of pursuant to merger agreement between issuer and Amtech Systems, Inc., in exchange on a per share basis for .3291 shares of Amtech common stock having a market value of $8.20 per share on the effective date of the merger. Mr. van der Wansem disclaims beneficial ownership of the shares held by the Partnership except to the extent of his pecuniary interest Mr. van der Wansem disclaims beneficial ownership in shares held by his wife. Mr. van der Wansem disclaims any beneficial ownership in shares held by the 1981 Van der Wansem Family Trust The restricted stock units were accelerated as a result of the merger. This option which is fully vested, was assumed by Amtech Systems, Inc., in the merger and converted into an option to purchase 21,720 shares of Amtech common stock for $30.54 per share. This option which is fully vested, was assumed by Amtech Systems, Inc., in the merger and converted into an option to purchase 10,860 shares of Amtech common stock for $15.23 per share. This option which is fully vested, was assumed by Amtech Systems, Inc., in the merger and converted into an option to purchase 10,860 shares of Amtech common stock for $12.34 per share. This option which is fully vested, was assumed by Amtech Systems, Inc., in the merger and converted into an option to purchase 16,455 shares of Amtech common stock for $17.60 per share. This option which is fully vested, was assumed by Amtech Systems, Inc., in the merger and converted into an option to purchase 11,518 shares of Amtech common stock for $16.35 per share This option which is fully vested, was assumed by Amtech Systems, Inc., in the merger and converted into an option to purchase 11,518 shares of Amtech common stock for $21.24 per share. This option which is fully vested, was assumed by Amtech Systems, Inc., in the merger and converted into an option to purchase 6,911 shares of Amtech common stock for $27.47 per share This option which is fully vested, was assumed by Amtech Systems, Inc., in the merger and converted into an option to purchase 6,911 shares of Amtech common stock for $10.82 per share. This option which is fully vested, was assumed by Amtech Systems, Inc., in the merger and converted into an option to purchase 8,227 shares of Amtech common stock for $9.21 per share. This option which is fully vested, was assumed by Amtech Systems, Inc., in the merger and converted into an option to purchase 8227 shares of Amtech common stock for $6.08 per share. This option which is fully vested, was assumed by Amtech Systems, Inc., in the merger and converted into an option to purchase 4,113 shares of Amtech common stock for $7.14 per share. This option which is fully vested, was assumed by Amtech Systems, Inc., in the merger and converted into an option to purchase 5,923 shares of Amtech common stock for $9.94 per share. /S/ Peter J. Tallian attorney in fact 2015-02-02