Robert W. Mcmahon
CIK 1608730 · View on SEC EDGAR ↗
Insider
First SEC filing: June 5, 2026 · Latest: June 5, 2026
On this page
Insider at
Insider transactions
0 buys (P)
0 sells (S)
Net:
$0
+ 67 non-open-market transactions below
last 12 months, based on the transactions shown below
Price change vs current quote, split-adjusted for corporate actions since the filing — not benchmarked, not annualized, not size-weighted
No open-market trades on record; showing all filings.
| Date | Ticker | Code | Shares | Price | Value | Owned after | Δ own | A/D | vs now |
|---|---|---|---|---|---|---|---|---|---|
| Aug. 11, 2026 | WST | M | 794 | — | — | 3,775 Direct | +26.64% | Acquired | (price as of 2026-08-19) |
| Aug. 11, 2026 | WST | F | 346 | $351.37 | $121,574 | 3,429 Direct | -9.17% | Disposed | 1.1% (price as of 2026-08-19) |
| Aug. 11, 2026 | WST | M | 6,355 | — | — | 9,784 Direct | +185.33% | Acquired | (price as of 2026-08-19) |
| Aug. 11, 2026 | WST | F | 2,764 | $351.37 | $971,187 | 7,021 Direct | -28.25% | Disposed | 1.1% (price as of 2026-08-19) |
| Aug. 11, 2026 | WST | M | 6,355 | — | — | 2,119 Direct | -74.99% | Disposed | (price as of 2026-08-19) |
| Aug. 11, 2026 | WST | M | 794 | — | — | 2,383 Direct | -24.99% | Disposed | (price as of 2026-08-19) |
| June 3, 2026 | OSUR | A | 46,106 | — | — | 123,137 | — | — | (price as of 2026-08-19) |
| March 1, 2026 | WST | A | 7,337 | — | — | 7,337 Direct | — | Acquired | (price as of 2026-08-19) |
| March 1, 2026 | WST | A | 3,082 | — | — | 3,082 Direct | — | Acquired | (price as of 2026-08-19) |
| Feb. 11, 2026 | WST | M | 4,231 | — | — | 8,462 Direct | -33.33% | Disposed | (price as of 2026-08-19) |
| Feb. 11, 2026 | WST | F | 1,250 | $246.16 | $307,700 | 2,980 Direct | -29.55% | Disposed | 44.3% (price as of 2026-08-19) |
| Feb. 11, 2026 | WST | M | 4,231 | — | — | 4,231 Direct | — | Acquired | (price as of 2026-08-19) |
| Aug. 11, 2025 | WST | A | 7,137 | $240.33 | $1,715,235 | 7,137 Direct | — | Acquired | 47.8% (price as of 2026-08-19) |
| Aug. 11, 2025 | WST | A | 7,647 | $240.33 | $1,837,804 | 7,647 Direct | — | Acquired | 47.8% (price as of 2026-08-19) |
| Aug. 11, 2025 | WST | A | 3,168 | — | — | 3,168 Direct | — | Acquired | (price as of 2026-08-19) |
| Aug. 11, 2025 | WST | A | 12,670 | — | — | 12,670 Direct | — | Acquired | (price as of 2026-08-19) |
| July 31, 2025 | OSUR | F | 7,317 | $3.20 | $23,414 | 99,919 Direct | -6.82% | Disposed | 18.9% (price as of 2026-08-19) |
| May 22, 2025 | A | F | 3,499 | $109.68 | $383,770 | 168,754 Direct | -2.03% | Disposed | 40.8% (price as of 2026-08-19) |
| May 14, 2025 | OSUR | A | 71,017 | — | — | 107,236 Direct | +196.08% | Acquired | (price as of 2026-08-19) |
| May 13, 2025 | OSUR | F | 6,427 | $2.65 | $17,032 | 36,219 Direct | -15.07% | Disposed | 43.6% (price as of 2026-08-19) |
| March 5, 2025 | A | A | 5,385 | $126.51 | $681,256 | 172,191 Direct | +3.23% | Acquired | 22.0% (price as of 2026-08-19) |
| Nov. 27, 2024 | A | A | 18,544 | $138.14 | $2,561,668 | 18,544 Direct | — | Acquired | 11.8% (price as of 2026-08-19) |
| Nov. 27, 2024 | A | A | 6,423 | $138.14 | $887,273 | 166,763 Direct | +4.01% | Acquired | 11.8% (price as of 2026-08-19) |
| Nov. 22, 2024 | A | F | 5,775 | $133.84 | $772,926 | 160,340 Direct | -3.48% | Disposed | 15.4% (price as of 2026-08-19) |
| Nov. 19, 2024 | A | F | 2,196 | $125.69 | $276,015 | 166,115 Direct | -1.30% | Disposed | 22.8% (price as of 2026-08-19) |
| Nov. 19, 2024 | A | A | 7,835 | $125.69 | $984,781 | 168,311 Direct | +4.88% | Acquired | 22.8% (price as of 2026-08-19) |
| Nov. 15, 2024 | A | F | 1,295 | $127.07 | $164,556 | 160,476 Direct | -0.80% | Disposed | 21.5% (price as of 2026-08-19) |
| May 14, 2024 | OSUR | A | 19,943 | — | — | 42,646 Direct | +87.84% | Acquired | (price as of 2026-08-19) |
| Nov. 22, 2023 | A | A | 20,734 | $123.99 | $2,570,809 | 20,734 Direct | — | Acquired | 24.5% (price as of 2026-08-19) |
| Nov. 22, 2023 | A | A | 29,641 | $123.99 | $3,675,188 | 161,991 Direct | +22.40% | Acquired | 24.5% (price as of 2026-08-19) |
| Nov. 22, 2023 | A | A | 7,312 | $123.99 | $906,615 | 132,350 Direct | +5.85% | Acquired | 24.5% (price as of 2026-08-19) |
| Nov. 17, 2023 | A | F | 2,429 | $113.15 | $274,841 | 125,038 Direct | -1.91% | Disposed | 36.5% (price as of 2026-08-19) |
| Nov. 16, 2023 | A | F | 504 | $114.19 | $57,552 | 127,467 Direct | -0.39% | Disposed | 35.2% (price as of 2026-08-19) |
| Nov. 15, 2023 | A | F | 664 | $113.60 | $75,430 | 127,971 Direct | -0.52% | Disposed | 35.9% (price as of 2026-08-19) |
| Nov. 14, 2023 | A | F | 4,640 | $111.61 | $517,870 | 128,243 Direct | -3.49% | Disposed | 38.3% (price as of 2026-08-19) |
| Nov. 14, 2023 | A | A | 16,687 | $111.61 | $1,862,436 | 132,883 Direct | +14.36% | Acquired | 38.3% (price as of 2026-08-19) |
| Nov. 14, 2023 | A | F | 4,248 | $111.61 | $474,119 | 128,635 Direct | -3.20% | Disposed | 38.3% (price as of 2026-08-19) |
| Nov. 14, 2023 | A | A | 16,687 | $111.61 | $1,862,436 | 132,883 Direct | +14.36% | Acquired | 38.3% (price as of 2026-08-19) |
| July 31, 2023 | OSUR | A | 22,703 | — | — | 22,703 Direct | — | Acquired | (price as of 2026-08-19) |
| Nov. 18, 2022 | A | F | 1,750 | $146.19 | $255,832 | 116,057 Direct | -1.49% | Disposed | 5.6% (price as of 2026-08-19) |
| Nov. 17, 2022 | A | F | 679 | $144.44 | $98,075 | 117,807 Direct | -0.57% | Disposed | 6.9% (price as of 2026-08-19) |
| Nov. 16, 2022 | A | F | 504 | $147.12 | $74,148 | 118,486 Direct | -0.42% | Disposed | 4.9% (price as of 2026-08-19) |
| Nov. 15, 2022 | A | A | 15,661 | $148.00 | $2,317,828 | 15,661 Direct | — | Acquired | 4.3% (price as of 2026-08-19) |
| Nov. 15, 2022 | A | F | 11,380 | $148.00 | $1,684,240 | 118,990 Direct | -8.73% | Disposed | 4.3% (price as of 2026-08-19) |
| Nov. 15, 2022 | A | A | 32,134 | $148.00 | $4,755,832 | 130,370 Direct | +32.71% | Acquired | 4.3% (price as of 2026-08-19) |
| Nov. 15, 2022 | A | A | 5,359 | $148.00 | $793,132 | 98,236 Direct | +5.77% | Acquired | 4.3% (price as of 2026-08-19) |
| Nov. 11, 2022 | A | F | 1,860 | $148.31 | $275,857 | 92,877 Direct | -1.96% | Disposed | 4.1% (price as of 2026-08-19) |
| Aug. 3, 2022 | A | F | 2,303 | $134.56 | $309,892 | 94,721 Direct | -2.37% | Disposed | 14.7% (price as of 2026-08-19) |
| Nov. 19, 2021 | A | F | 1,751 | $164.30 | $287,689 | 96,977 Direct | -1.77% | Disposed | -6.0% (price as of 2026-08-19) |
| Nov. 17, 2021 | A | F | 678 | $161.54 | $109,524 | 98,728 Direct | -0.68% | Disposed | -4.4% (price as of 2026-08-19) |
| Nov. 16, 2021 | A | A | 15,613 | $161.39 | $2,519,782 | 15,613 Direct | — | Acquired | -4.3% (price as of 2026-08-19) |
| Nov. 16, 2021 | A | F | 11,196 | $161.39 | $1,806,922 | 99,406 Direct | -10.12% | Disposed | -4.3% (price as of 2026-08-19) |
| Nov. 16, 2021 | A | A | 31,615 | $161.39 | $5,102,345 | 110,602 Direct | +40.03% | Acquired | -4.3% (price as of 2026-08-19) |
| Nov. 16, 2021 | A | A | 4,060 | $161.39 | $655,243 | 78,987 Direct | +5.42% | Acquired | -4.3% (price as of 2026-08-19) |
| Nov. 12, 2021 | A | F | 1,869 | $160.88 | $300,685 | 74,927 Direct | -2.43% | Disposed | -4.0% (price as of 2026-08-19) |
| Aug. 3, 2021 | A | F | 2,327 | $153.86 | $358,032 | 76,796 Direct | -2.94% | Disposed | 0.4% (price as of 2026-08-19) |
| Nov. 19, 2020 | A | F | 1,751 | $108.68 | $190,299 | 79,123 Direct | -2.17% | Disposed | 42.1% (price as of 2026-08-19) |
| Nov. 17, 2020 | A | A | 22,898 | — | — | 22,898 Direct | — | Acquired | (price as of 2026-08-19) |
| Nov. 17, 2020 | A | F | 27,019 | $109.86 | $2,968,307 | 80,874 Direct | -25.04% | Disposed | 40.5% (price as of 2026-08-19) |
| Nov. 17, 2020 | A | A | 54,494 | $109.86 | $5,986,711 | 107,893 Direct | +102.05% | Acquired | 40.5% (price as of 2026-08-19) |
| Nov. 17, 2020 | A | A | 5,470 | $109.86 | $600,934 | 53,399 Direct | +11.41% | Acquired | 40.5% (price as of 2026-08-19) |
| Nov. 13, 2020 | A | F | 1,427 | $110.17 | $157,213 | 47,929 Direct | -2.89% | Disposed | 40.1% (price as of 2026-08-19) |
| Aug. 3, 2020 | A | F | 2,303 | $99.09 | $228,204 | 49,356 Direct | -4.46% | Disposed | 55.8% (price as of 2026-08-19) |
| Nov. 19, 2019 | A | A | 14,122 | $79.29 | $1,119,733 | 51,659 Direct | +37.62% | Acquired | 94.7% (price as of 2026-08-19) |
| Nov. 13, 2019 | A | F | 1,869 | $77.16 | $144,212 | 37,537 Direct | -4.74% | Disposed | 100.1% (price as of 2026-08-19) |
| Aug. 2, 2019 | A | F | 2,303 | $68.08 | $156,788 | 39,406 Direct | -5.52% | Disposed | 126.8% (price as of 2026-08-19) |
| Nov. 13, 2018 | A | A | 15,074 | $64.34 | $969,861 | 41,709 Direct | +56.59% | Acquired | 140.0% (price as of 2026-08-19) |
P = Open-market purchase · S = Sale · A = Grant/award · M = Option exercise · G = Gift · F = Tax withholding
Insider transactions are not a recommendation; sales are often driven by liquidity or tax reasons.
Derivative holdings (Form 4 Table II)
Options, RSUs and convertible securities reported on Form 4 Table II.
| Date | Ticker | Security | Underlying | Exercise price | Expiration | Shares | A/D |
|---|---|---|---|---|---|---|---|
| Aug. 11, 2026 | WST | Rst. Stock Unit | Common Stock (6,355) | — | — | 6,355 | Disposed |
| Aug. 11, 2026 | WST | Rst. Stock Unit | Common Stock (794) | — | — | 794 | Disposed |
| March 1, 2026 | WST | Stock Option (Right to Buy) | Common Stock (7,337) | $254.34 | March 1, 2036 | 7,337 | Acquired |
| March 1, 2026 | WST | Rst. Stock Unit | Common Stock (3,082) | — | — | 3,082 | Acquired |
| Feb. 11, 2026 | WST | Rst. Stock Unit | Common Stock (4,231) | — | — | 4,231 | Disposed |
| Aug. 11, 2025 | WST | Stock Option (Right to Buy) | Common Stock (7,137) | $240.33 | Aug. 11, 2035 | 7,137 | Acquired |
| Aug. 11, 2025 | WST | Stock Option (Right to Buy) | Common Stock (7,647) | $240.33 | Aug. 11, 2035 | 7,647 | Acquired |
| Aug. 11, 2025 | WST | Rst. Stock Unit | Common Stock (3,168) | $0.00 | — | 3,168 | Acquired |
| Aug. 11, 2025 | WST | Rst. Stock Unit | Common Stock (12,670) | $0.00 | — | 12,670 | Acquired |
| Nov. 27, 2024 | A | Employee Stock Option (Right to Buy) [F2] | Common Stock (18,544) | $138.14 | Nov. 27, 2034 | 18,544 | Acquired |
| Nov. 22, 2023 | A | Employee Stock Option (Right to Buy) [F3] | Common Stock (20,734) | $123.99 | Nov. 22, 2033 | 20,734 | Acquired |
| Nov. 15, 2022 | A | Employee Stock Option (Right to Buy) [F4] | Common Stock (15,661) | $148.00 | Nov. 15, 2032 | 15,661 | Acquired |
| Nov. 16, 2021 | A | Employee Stock Option (Right to Buy) [F4] | Common Stock (15,613) | $161.39 | Nov. 16, 2031 | 15,613 | Acquired |
| Nov. 17, 2020 | A | Employee Stock Option (Right-to-Buy) [F4] | Common Stock (22,898) | $109.86 | Nov. 17, 2030 | 22,898 | Acquired |
Exercise/conversion price is blank when not applicable (e.g. RSUs).
Initial ownership (Form 3) 5 holdings
Securities held when first becoming an insider, per SEC Form 3.
| Date | Ticker | Security | Shares | Ownership |
|---|---|---|---|---|
| Aug. 12, 2025 | WST | Rst. Stock Unit→ Common Stock (3,168) | 3,168 | Direct |
| Aug. 12, 2025 | WST | Rst. Stock Unit→ Common Stock (12,670) | 12,670 | Direct |
| Aug. 12, 2025 | WST | Stock Option (Right to Buy)→ Common Stock (7,647) | 7,647 | Direct |
| Aug. 12, 2025 | WST | Stock Option (Right to Buy)→ Common Stock (7,137) | 7,137 | Direct |
| Sept. 5, 2018 | A | Common Stock | — | Direct |