William S. Johnson serves as Executive at CABOT MICROELECTRONICS CORP, where they oversee executive responsibilities. Since joining the company, William S. Johnson has executed 224 insider transactions totaling $27.2M, demonstrating a bearish approach to their equity position. Their most recent transaction on Nov 6, 2025 involved receiving (via award) 3,500 shares valued at $0.
William S. Johnson currently holds 46,700 shares of CABOT MICROELECTRONICS CORP (CCMP), valued at approximately $0. This represents their equity stake as Executive.
Based on SEC Form 4 filings, William S. Johnson has been a net seller of CCMP stock. They have purchased $0 and sold $27.2M worth of shares.
William S. Johnson's most recent insider trade was on Nov 6, 2025, when they sold 3,500 shares at $0.00 per share.
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| $N/A |
| Discretionary |
| Nov 10, 2022 | CTS | $0 | Award | 3,100 | $N/A | Discretionary |
| Nov 4, 2021 | CTS | $132.1K | Award | 3,600 | $36.69 | Discretionary |
| Nov 5, 2020 | CTS | $122.8K | Award | 4,200 | $29.23 | Discretionary |
| Nov 7, 2019 | CTS | $122.4K | Award | 4,400 | $27.81 | Discretionary |
| Nov 8, 2018 | CTS | $121.2K | Award | 4,200 | $28.85 | Discretionary |
| Jan 2, 2018 | CCMP | $179.2K | Payment | 1,859 | $96.41 | Discretionary |
| Dec 5, 2017 | CCMP | $105.3K | Payment | 1,138 | $92.57 | Discretionary |
| Dec 4, 2017 | CCMP | $91.0K | Payment | 985 | $92.42 | Discretionary |
| Dec 4, 2017 | CCMP | $92.1K | Payment | 997 | $92.42 | Discretionary |
| Dec 4, 2017 | CCMP | $77.0K | Payment | 833 | $92.42 | Discretionary |
| Nov 9, 2017 | CTS | $96.9K | Award | 3,700 | $26.20 | Discretionary |
| Oct 31, 2017 | CCMP | $1.7M | Sale | 17,594 | $96.38 | Discretionary |
| Oct 31, 2017 | CCMP | $574.3K | Option Exercise | 17,594 | $32.64 | Discretionary |
| Aug 2, 2017 | CCMP | $870.9K | Sale | 11,806 | $73.77 | Discretionary |
| Aug 2, 2017 | CCMP | $385.3K | Option Exercise | 11,806 | $32.64 | Discretionary |
| May 5, 2017 | CCMP | $1.5M | Sale | 18,930 | $78.08 | Discretionary |
| May 5, 2017 | CCMP | $528.9K | Option Exercise | 18,930 | $27.94 | Discretionary |
| Jan 3, 2017 | CCMP | $115.6K | Payment | 1,824 | $63.39 | Discretionary |
| Dec 13, 2016 | CCMP | $8.3K | Payment | 133 | $62.65 | Discretionary |
| Dec 5, 2016 | CCMP | $0 | Award | 9,700 | $N/A | Discretionary |
| Dec 5, 2016 | CCMP | $67.5K | Payment | 1,120 | $60.27 | Discretionary |
| Dec 5, 2016 | CCMP | $57.9K | Payment | 960 | $60.27 | Discretionary |
| Dec 5, 2016 | CCMP | $48.9K | Payment | 812 | $60.27 | Discretionary |
| Dec 5, 2016 | CCMP | $58.6K | Payment | 972 | $60.27 | Discretionary |
| Nov 10, 2016 | CTS | $110.0K | Award | 5,500 | $20.00 | Discretionary |
| Nov 1, 2016 | CCMP | $555.6K | Sale | 10,000 | $55.56 | Discretionary |
| Oct 31, 2016 | CCMP | $541.8K | Option Exercise | 18,931 | $28.62 | Discretionary |
| Oct 31, 2016 | CCMP | $1.0M | Sale | 18,931 | $54.67 | Discretionary |