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Explanation of Responses:
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(
1)
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Shares were transferred by gift by reporting person to himself as trustee of a family trust.
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(
2)
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Shares are held by reporting person as trustee of a family trust.
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(
3)
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Shares were transferred by gift by reporting person to himself and his spouse as trustees of a family trust.
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(
4)
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Shares are held by reporting person and his spouse as trustees of a family trust.
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(
5)
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On April 29, 2016, pursuant to the Agreement and Plan of Merger between the issuer, MKS Instruments, Inc. ("MKS") and MKS' wholly owned subsidiary, PSI Equipment, Inc. ("Merger Sub"), dated February 22, 2016 (the "Merger Agreement"), Merger Sub merged with and into the issuer (the "Merger"), with the issuer surviving the Merger as a wholly owned subsidiary of MKS. Pursuant to the Merger Agreement, at the effective time of the Merger, the shares were automatically converted into a right to receive $23.00 per share in cash.
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(
6)
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Shares had been held by reporting person as trustee of a family trust.
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(
7)
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Shares had been held by reporting person and his spouse as trustees of a family trust.
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(
8)
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Restricted stock units representing the right to receive a total of 5,550 shares of the issuer's common stock, which vest on March 31, 2017, were assumed by MKS in connection with the Merger and were converted into restricted stock units representing the right to receive a total of 3,407 shares of MKS' common stock.
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(
9)
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Restricted stock units representing the right to receive a total of 9,220 shares of the issuer's common stock, which vest in two equal installments on March 31, 2017 and March 31, 2018, were assumed by MKS in connection with the Merger and were converted into restricted stock units representing the right to receive a total of 5,660 shares of MKS' common stock.
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(
10)
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Stock appreciation right, which became fully vested on March 31, 2013, was assumed by MKS in connection with the Merger and was converted into a stock appreciation right with respect to a total of 6,731 shares of MKS' common stock having a base value of $20.32 per share.
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(
11)
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Stock appreciation right, which became fully vested on March 31, 2014, was assumed by MKS in connection with the Merger and was converted into a stock appreciation right with respect to a total of 4,843 shares of MKS' common stock having a base value of $27.79 per share.
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(
12)
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Stock appreciation right, which became fully vested on March 31, 2015, was assumed by MKS in connection with the Merger and was converted into a stock appreciation right with respect to a total of 6,814 shares of MKS' common stock having a base value of $27.89 per share.
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(
13)
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Stock appreciation right, which became fully vested on March 31, 2016, was assumed by MKS in connection with the Merger and was converted into a stock appreciation right with respect to a total of 11,897 shares of MKS' common stock having a base value of $22.39 per share.
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(
14)
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Stock appreciation right, which vests in equal 1/3rd installments on March 31, 2015, 2016 and 2017, was assumed by MKS in connection with the Merger and was converted into a stock appreciation right with respect to a total of 10,221 shares of MKS' common stock having a base value of $29.80 per share.
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(
15)
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Stock appreciation right, which vests in equal 1/3rd installments on March 31, 2016, 2017 and 2018, was assumed by MKS in connection with the Merger and was converted into a stock appreciation right with respect to a total of 8,490 shares of MKS' common stock having a base value of $31.13 per share.
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