Christine E Seidman
CIK 1805745 · View on SEC EDGAR ↗
Insider
First SEC filing: March 18, 2020 · Latest: April 1, 2026
On this page
Insider at
Insider transactions
0 buys (P)
0 sells (S)
Net:
$0
+ 34 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 |
|---|---|---|---|---|---|---|---|---|---|
| June 30, 2026 | MRK | A | 63 | $128.50 | $8,096 | 21,291 Direct | +0.30% | Acquired | 17.0% (price as of 2026-08-20) |
| May 29, 2026 | MRK | A | 1,853 | $118.72 | $219,988 | 21,228 Direct | +9.56% | Acquired | 26.7% (price as of 2026-08-20) |
| March 31, 2026 | MRK | A | 68 | $120.29 | $8,180 | 19,238 Direct | +0.35% | Acquired | 25.0% (price as of 2026-08-20) |
| Dec. 31, 2025 | MRK | A | 77 | $105.26 | $8,105 | 19,026 Direct | +0.41% | Acquired | 42.9% (price as of 2026-08-20) |
| Sept. 30, 2025 | MRK | A | 97 | $83.93 | $8,141 | 18,776 Direct | +0.52% | Acquired | 79.2% (price as of 2026-08-20) |
| June 30, 2025 | MRK | A | 103 | $79.16 | $8,153 | 18,496 Direct | +0.56% | Acquired | 90.0% (price as of 2026-08-20) |
| May 30, 2025 | MRK | A | 2,863 | $76.84 | $219,993 | 18,393 Direct | +18.44% | Acquired | 95.7% (price as of 2026-08-20) |
| March 31, 2025 | MRK | A | 91 | $89.76 | $8,168 | 15,378 Direct | +0.60% | Acquired | 67.6% (price as of 2026-08-20) |
| Dec. 31, 2024 | MRK | A | 82 | $99.48 | $8,157 | 15,165 Direct | +0.54% | Acquired | 51.2% (price as of 2026-08-20) |
| Sept. 30, 2024 | MRK | A | 72 | $113.56 | $8,176 | 14,977 Direct | +0.48% | Acquired | 32.4% (price as of 2026-08-20) |
| June 28, 2024 | MRK | A | 66 | $123.80 | $8,171 | 14,816 Direct | +0.45% | Acquired | 21.5% (price as of 2026-08-20) |
| May 31, 2024 | MRK | A | 1,752 | $125.54 | $219,946 | 14,750 Direct | +13.48% | Acquired | 19.8% (price as of 2026-08-20) |
| March 28, 2024 | MRK | A | 62 | $131.95 | $8,181 | 12,920 Direct | +0.48% | Acquired | 14.0% (price as of 2026-08-20) |
| Dec. 29, 2023 | MRK | A | 75 | $109.02 | $8,176 | 12,775 Direct | +0.59% | Acquired | 38.0% (price as of 2026-08-20) |
| Sept. 29, 2023 | MRK | A | 79 | $102.95 | $8,133 | 12,613 Direct | +0.63% | Acquired | 46.1% (price as of 2026-08-20) |
| June 30, 2023 | MRK | A | 70 | $115.39 | $8,077 | 12,451 Direct | +0.57% | Acquired | 30.3% (price as of 2026-08-20) |
| May 26, 2023 | MRK | A | 1,981 | $111.07 | $220,030 | 12,381 Direct | +19.05% | Acquired | 35.4% (price as of 2026-08-20) |
| March 31, 2023 | MRK | A | 76 | $106.39 | $8,086 | 10,340 Direct | +0.74% | Acquired | 41.4% (price as of 2026-08-20) |
| Dec. 30, 2022 | MRK | A | 73 | $110.95 | $8,099 | 10,193 Direct | +0.72% | Acquired | 35.6% (price as of 2026-08-20) |
| Sept. 30, 2022 | MRK | A | 94 | $86.12 | $8,095 | 10,039 Direct | +0.95% | Acquired | 74.6% (price as of 2026-08-20) |
| June 30, 2022 | MRK | A | 89 | $91.17 | $8,114 | 9,872 Direct | +0.91% | Acquired | 65.0% (price as of 2026-08-20) |
| May 27, 2022 | MRK | A | 2,364 | $93.08 | $220,041 | 9,783 Direct | +31.86% | Acquired | 61.6% (price as of 2026-08-20) |
| March 31, 2022 | MRK | A | 198 | $82.05 | $16,246 | 7,362 Direct | +2.76% | Acquired | 83.3% (price as of 2026-08-20) |
| Dec. 31, 2021 | MRK | A | 212 | $76.64 | $16,248 | 7,105 Direct | +3.08% | Acquired | 96.2% (price as of 2026-08-20) |
| Sept. 30, 2021 | MRK | A | 216 | $75.11 | $16,224 | 6,840 Direct | +3.26% | Acquired | 100.2% (price as of 2026-08-20) |
| June 30, 2021 | MRK | A | 209 | $77.77 | $16,254 | 6,571 Direct | +3.29% | Acquired | 93.4% (price as of 2026-08-20) |
| May 28, 2021 | MRK | A | 2,635 | $75.89 | $199,970 | 6,173 Direct | +74.48% | Acquired | 107.7% (price as of 2026-08-20) |
| March 31, 2021 | MRK | A | 211 | $77.09 | $16,266 | 3,510 Direct | +6.40% | Acquired | 104.5% (price as of 2026-08-20) |
| Dec. 31, 2020 | MRK | A | 199 | $81.80 | $16,278 | 3,275 Direct | +6.47% | Acquired | 92.7% (price as of 2026-08-20) |
| Sept. 30, 2020 | MRK | A | 196 | $82.95 | $16,258 | 3,054 Direct | +6.86% | Acquired | 90.0% (price as of 2026-08-20) |
| June 30, 2020 | MRK | A | 210 | $77.33 | $16,239 | 2,838 Direct | +7.99% | Acquired | 103.8% (price as of 2026-08-20) |
| May 29, 2020 | MRK | A | 2,478 | $80.72 | $200,024 | 2,628 Direct | +1652.00% | Acquired | 95.3% (price as of 2026-08-20) |
| March 31, 2020 | MRK | A | 36 | $76.94 | $2,770 | 150 Direct | +31.58% | Acquired | 104.9% (price as of 2026-08-20) |
| March 16, 2020 | MRK | A | 114 | $69.92 | $7,971 | 114 Direct | — | Acquired | 125.4% (price as of 2026-08-20) |
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 |
|---|---|---|---|---|---|---|---|
| June 30, 2026 | MRK | Phantom Stock | Common Stock (63) | — | — | 63 | Acquired |
| May 29, 2026 | MRK | Phantom Stock | Common Stock (1,853) | — | — | 1,853 | Acquired |
| March 31, 2026 | MRK | Phantom Stock | Common Stock (68) | — | — | 68 | Acquired |
| Dec. 31, 2025 | MRK | Phantom Stock | Common Stock (77) | — | — | 77 | Acquired |
| Sept. 30, 2025 | MRK | Phantom Stock | Common Stock (97) | — | — | 97 | Acquired |
| June 30, 2025 | MRK | Phantom Stock | Common Stock (103) | — | — | 103 | Acquired |
| May 30, 2025 | MRK | Phantom Stock | Common Stock (2,863) | — | — | 2,863 | Acquired |
| March 31, 2025 | MRK | Phantom Stock | Common Stock (91) | — | — | 91 | Acquired |
| Dec. 31, 2024 | MRK | Phantom Stock | Common Stock (82) | — | — | 82 | Acquired |
| Sept. 30, 2024 | MRK | Phantom Stock | Common Stock (72) | — | — | 72 | Acquired |
| June 28, 2024 | MRK | Phantom Stock | Common Stock (66) | — | — | 66 | Acquired |
| May 31, 2024 | MRK | Phantom Stock | Common Stock (1,752) | — | — | 1,752 | Acquired |
| March 28, 2024 | MRK | Phantom Stock | Common Stock (62) | — | — | 62 | Acquired |
| Dec. 29, 2023 | MRK | Phantom Stock | Common Stock (75) | — | — | 75 | Acquired |
| Sept. 29, 2023 | MRK | Phantom Stock | Common Stock (79) | — | — | 79 | Acquired |
| June 30, 2023 | MRK | Phantom Stock | Common Stock (70) | — | — | 70 | Acquired |
| May 26, 2023 | MRK | Phantom Stock | Common Stock (1,981) | — | — | 1,981 | Acquired |
| March 31, 2023 | MRK | Phantom Stock | Common Stock (76) | — | — | 76 | Acquired |
| Dec. 30, 2022 | MRK | Phantom Stock | Common Stock (73) | — | — | 73 | Acquired |
| Sept. 30, 2022 | MRK | Phantom Stock | Common Stock (94) | — | — | 94 | Acquired |
| June 30, 2022 | MRK | Phantom Stock | Common Stock (89) | — | — | 89 | Acquired |
| May 27, 2022 | MRK | Phantom Stock | Common Stock (2,364) | — | — | 2,364 | Acquired |
| March 31, 2022 | MRK | Phantom Stock | Common Stock (198) | — | — | 198 | Acquired |
| Dec. 31, 2021 | MRK | Phantom Stock | Common Stock (212) | — | — | 212 | Acquired |
| Sept. 30, 2021 | MRK | Phantom Stock | Common Stock (216) | — | — | 216 | Acquired |
| June 30, 2021 | MRK | Phantom Stock | Common Stock (209) | — | — | 209 | Acquired |
| May 28, 2021 | MRK | Phantom Stock | Common Stock (2,635) | — | — | 2,635 | Acquired |
| March 31, 2021 | MRK | Phantom Stock | Common Stock (211) | — | — | 211 | Acquired |
| Dec. 31, 2020 | MRK | Phantom Stock | Common Stock (199) | — | — | 199 | Acquired |
| Sept. 30, 2020 | MRK | Phantom Stock | Common Stock (196) | — | — | 196 | Acquired |
| June 30, 2020 | MRK | Phantom Stock | Common Stock (210) | — | — | 210 | Acquired |
| May 29, 2020 | MRK | Phantom Stock | Common Stock (2,478) | — | — | 2,478 | Acquired |
| March 31, 2020 | MRK | Phantom Stock | Common Stock (36) | — | — | 36 | Acquired |
| March 16, 2020 | MRK | Phantom Stock | Common Stock (114) | — | — | 114 | Acquired |
Exercise/conversion price is blank when not applicable (e.g. RSUs).
Initial ownership (Form 3) 1 holding
Securities held when first becoming an insider, per SEC Form 3.
| Date | Ticker | Security | Shares | Ownership |
|---|---|---|---|---|
| March 18, 2020 | MRK | Common Stock | 100 | Direct |