Rita A Karachun
Insider
First SEC filing: June 9, 2026 · Latest: June 9, 2026
Insider at
Insider transactions
0 buys (P)
0 sells (S)
Net: $0
Price change vs current quote, split-adjusted for corporate actions since the filing — not benchmarked, not annualized, not size-weighted
| Date | Ticker | Code | Shares | Price | Value | Owned after | Δ own | A/D | vs now |
|---|---|---|---|---|---|---|---|---|---|
| June 5, 2026 | CHRS | A | 30,000 | · | · | 30,000 Direct | · | Acquired | (price as of 2026-10-06) |
| June 5, 2026 | CHRS | A | 60,000 | · | · | 60,000 Direct | · | Acquired | (price as of 2026-10-06) |
| June 12, 2025 | CHRS | A | 112,000 | · | · | 112,000 Direct | · | Acquired | (price as of 2026-10-06) |
| June 4, 2024 | CHRS | A | 168,000 | · | · | 168,000 Direct | · | Acquired | (price as of 2026-10-06) |
| May 4, 2023 | MRK | M | 15,875 | · | · | 0 Direct | -100.00% | Disposed | (price as of 2026-10-06) |
| May 4, 2023 | MRK | M | 949 | · | · | 951 Direct | -49.95% | Disposed | (price as of 2026-10-06) |
| May 4, 2023 | MRK | S | 15,875 | $117.53 | $1,865,789 | 45,710 Direct | -25.78% | Disposed | 20.8% (price as of 2026-10-06) |
| May 4, 2023 | MRK | M | 15,875 | $62.07 | $985,361 | 61,585 Direct | +34.73% | Acquired | 128.7% (price as of 2026-10-06) |
| May 4, 2023 | MRK | F | 326 | $118.22 | $38,540 | 45,710 Direct | -0.71% | Disposed | 20.1% (price as of 2026-10-06) |
| May 4, 2023 | MRK | M | 949 | $118.22 | $112,191 | 46,036 Direct | +2.10% | Acquired | 20.1% (price as of 2026-10-06) |
| May 3, 2023 | MRK | M | 803 | · | · | 1,608 Direct | -33.31% | Disposed | (price as of 2026-10-06) |
| May 3, 2023 | MRK | F | 276 | $117.89 | $32,538 | 45,087 Direct | -0.61% | Disposed | 20.4% (price as of 2026-10-06) |
| May 3, 2023 | MRK | M | 803 | $117.89 | $94,666 | 45,363 Direct | +1.80% | Acquired | 20.4% (price as of 2026-10-06) |
| May 2, 2023 | MRK | A | 1,781 | · | · | 1,781 Direct | · | Acquired | (price as of 2026-10-06) |
| May 2, 2023 | MRK | A | 9,682 | · | · | 9,682 Direct | · | Acquired | (price as of 2026-10-06) |
| May 1, 2023 | MRK | M | 930 | · | · | 0 Direct | -100.00% | Disposed | (price as of 2026-10-06) |
| May 1, 2023 | MRK | F | 319 | $115.47 | $36,835 | 44,560 Direct | -0.71% | Disposed | 22.9% (price as of 2026-10-06) |
| May 1, 2023 | MRK | M | 930 | $115.47 | $107,387 | 44,879 Direct | +2.12% | Acquired | 22.9% (price as of 2026-10-06) |
| Jan. 23, 2023 | MRK | A | 2,846 | $109.88 | $312,718 | 43,949 Direct | +6.92% | Acquired | 29.2% (price as of 2026-10-06) |
| Oct. 28, 2022 | MRK | M | 15,000 | · | · | 15,875 Direct | -48.58% | Disposed | (price as of 2026-10-06) |
| Oct. 28, 2022 | MRK | M | 16,997 | · | · | 0 Direct | -100.00% | Disposed | (price as of 2026-10-06) |
| Oct. 28, 2022 | MRK | S | 31,997 | $100.34 | $3,210,579 | 41,103 Direct | -43.77% | Disposed | 41.5% (price as of 2026-10-06) |
| Oct. 28, 2022 | MRK | M | 15,000 | · | · | 73,100 Direct | +25.82% | Acquired | (price as of 2026-10-06) |
| Oct. 28, 2022 | MRK | M | 16,997 | · | · | 58,100 Direct | +41.35% | Acquired | (price as of 2026-10-06) |
| May 4, 2022 | MRK | M | 949 | $87.10 | $82,658 | 41,429 Direct | +2.34% | Acquired | 63.0% (price as of 2026-10-06) |
| May 4, 2022 | MRK | F | 326 | $87.10 | $28,395 | 41,103 Direct | -0.79% | Disposed | 63.0% (price as of 2026-10-06) |
| May 4, 2022 | MRK | M | 949 | · | · | 1,900 Direct | -33.31% | Disposed | (price as of 2026-10-06) |
| May 3, 2022 | MRK | A | 13,592 | · | · | 13,592 Direct | · | Acquired | (price as of 2026-10-06) |
| May 3, 2022 | MRK | A | 2,411 | · | · | 2,411 Direct | · | Acquired | (price as of 2026-10-06) |
| May 3, 2022 | MRK | M | 902 | · | · | 0 Direct | -100.00% | Disposed | (price as of 2026-10-06) |
| May 3, 2022 | MRK | F | 309 | $87.65 | $27,084 | 40,480 Direct | -0.76% | Disposed | 61.9% (price as of 2026-10-06) |
| May 3, 2022 | MRK | M | 902 | $87.65 | $79,060 | 40,789 Direct | +2.26% | Acquired | 61.9% (price as of 2026-10-06) |
| May 1, 2022 | MRK | F | 318 | $88.69 | $28,203 | 39,887 Direct | -0.79% | Disposed | 60.0% (price as of 2026-10-06) |
| May 1, 2022 | MRK | M | 928 | · | · | 930 Direct | -49.95% | Disposed | (price as of 2026-10-06) |
| May 1, 2022 | MRK | M | 928 | $88.69 | $82,304 | 40,205 Direct | +2.36% | Acquired | 60.0% (price as of 2026-10-06) |
| Feb. 24, 2022 | MRK | A | 3,478 | $73.51 | $255,668 | 39,277 Direct | +9.72% | Acquired | 93.1% (price as of 2026-10-06) |
| Nov. 3, 2021 | MRK | M | 25,000 | · | · | 16,997 Direct | -59.53% | Disposed | (price as of 2026-10-06) |
| Nov. 3, 2021 | MRK | S | 25,000 | $88.45 | $2,211,250 | 35,799 Direct | -41.12% | Disposed | 60.5% (price as of 2026-10-06) |
| Nov. 3, 2021 | MRK | M | 25,000 | · | · | 60,799 Direct | +69.83% | Acquired | (price as of 2026-10-06) |
| May 4, 2021 | MRK | M | 1,212 | · | · | 0 Direct | -100.00% | Disposed | (price as of 2026-10-06) |
| May 4, 2021 | MRK | A | 2,764 | · | · | 2,764 Direct | · | Acquired | (price as of 2026-10-06) |
| May 4, 2021 | MRK | A | 21,429 | · | · | 21,429 Direct | · | Acquired | (price as of 2026-10-06) |
| May 4, 2021 | MRK | F | 416 | $75.98 | $31,608 | 35,799 Direct | -1.15% | Disposed | 95.8% (price as of 2026-10-06) |
| May 4, 2021 | MRK | M | 1,212 | $75.98 | $92,088 | 36,215 Direct | +3.46% | Acquired | 95.8% (price as of 2026-10-06) |
| May 3, 2021 | MRK | M | 875 | · | · | 875 Direct | -50.00% | Disposed | (price as of 2026-10-06) |
| May 3, 2021 | MRK | F | 300 | $74.50 | $22,350 | 35,003 Direct | -0.85% | Disposed | 99.7% (price as of 2026-10-06) |
| May 3, 2021 | MRK | M | 875 | $74.50 | $65,188 | 35,303 Direct | +2.54% | Acquired | 99.7% (price as of 2026-10-06) |
| May 1, 2021 | MRK | M | 901 | · | · | 1,803 Direct | -33.32% | Disposed | (price as of 2026-10-06) |
| May 1, 2021 | MRK | F | 309 | $74.50 | $23,020 | 34,428 Direct | -0.89% | Disposed | 99.7% (price as of 2026-10-06) |
| May 1, 2021 | MRK | M | 901 | $74.50 | $67,124 | 34,737 Direct | +2.66% | Acquired | 99.7% (price as of 2026-10-06) |
| Feb. 26, 2021 | MRK | A | 6,052 | $72.62 | $439,496 | 33,836 Direct | +21.78% | Acquired | 104.8% (price as of 2026-10-06) |
| May 5, 2020 | MRK | M | 3,283 | · | · | 0 Direct | -100.00% | Disposed | (price as of 2026-10-06) |
| May 5, 2020 | MRK | F | 1,617 | $76.86 | $124,283 | 27,784 Direct | -5.50% | Disposed | 93.5% (price as of 2026-10-06) |
| May 5, 2020 | MRK | M | 3,283 | $76.86 | $252,331 | 29,401 Direct | +12.57% | Acquired | 93.5% (price as of 2026-10-06) |
| May 4, 2020 | MRK | M | 1,212 | · | · | 1,212 Direct | -50.00% | Disposed | (price as of 2026-10-06) |
| May 4, 2020 | MRK | F | 597 | $77.67 | $46,369 | 26,118 Direct | -2.23% | Disposed | 91.5% (price as of 2026-10-06) |
| May 4, 2020 | MRK | M | 1,212 | $77.67 | $94,136 | 26,715 Direct | +4.75% | Acquired | 91.5% (price as of 2026-10-06) |
| May 3, 2020 | MRK | M | 875 | · | · | 1,750 Direct | -33.33% | Disposed | (price as of 2026-10-06) |
| May 3, 2020 | MRK | F | 431 | $77.67 | $33,476 | 25,503 Direct | -1.66% | Disposed | 91.5% (price as of 2026-10-06) |
| May 3, 2020 | MRK | M | 875 | $77.67 | $67,961 | 25,934 Direct | +3.49% | Acquired | 91.5% (price as of 2026-10-06) |
| May 1, 2020 | MRK | A | 2,704 | · | · | 2,704 Direct | · | Acquired | (price as of 2026-10-06) |
| May 1, 2020 | MRK | A | 21,144 | · | · | 21,144 Direct | · | Acquired | (price as of 2026-10-06) |
| Feb. 28, 2020 | MRK | A | 4,269 | $76.56 | $326,835 | 25,059 Direct | +20.53% | Acquired | 94.3% (price as of 2026-10-06) |
| May 10, 2019 | MRK | F | 1,622 | $78.33 | $127,051 | 20,790 Direct | -7.24% | Disposed | 89.9% (price as of 2026-10-06) |
| May 10, 2019 | MRK | M | 3,292 | $78.33 | $257,862 | 0 Direct | -100.00% | Disposed | 89.9% (price as of 2026-10-06) |
| May 10, 2019 | MRK | M | 3,292 | · | · | 22,412 Direct | +17.22% | Acquired | (price as of 2026-10-06) |
| May 4, 2019 | MRK | M | 1,212 | $80.00 | $96,960 | 2,424 Direct | -33.33% | Disposed | 85.9% (price as of 2026-10-06) |
| May 4, 2019 | MRK | F | 597 | $80.00 | $47,760 | 19,120 Direct | -3.03% | Disposed | 85.9% (price as of 2026-10-06) |
| May 4, 2019 | MRK | M | 1,212 | · | · | 19,717 Direct | +6.55% | Acquired | (price as of 2026-10-06) |
| May 3, 2019 | MRK | A | 2,625 | · | · | 2,625 Direct | · | Acquired | (price as of 2026-10-06) |
| May 3, 2019 | MRK | A | 19,759 | · | · | 19,759 Direct | · | Acquired | (price as of 2026-10-06) |
| Feb. 25, 2019 | MRK | A | 2,330 | $80.38 | $187,285 | 18,505 Direct | +14.40% | Acquired | 85.1% (price as of 2026-10-06) |
| Feb. 14, 2019 | MRK | M | 37,152 | $59.86 | $2,223,919 | 53,327 Direct | +229.69% | Acquired | 148.5% (price as of 2026-10-06) |
| Feb. 14, 2019 | MRK | M | 27,510 | $58.22 | $1,601,632 | 80,837 Direct | +51.59% | Acquired | 155.5% (price as of 2026-10-06) |
| Feb. 14, 2019 | MRK | S | 64,662 | $78.96 | $5,105,712 | 16,175 Direct | -79.99% | Disposed | 88.4% (price as of 2026-10-06) |
| Feb. 14, 2019 | MRK | M | 37,152 | · | · | 0 Direct | -100.00% | Disposed | (price as of 2026-10-06) |
| Feb. 14, 2019 | MRK | M | 27,510 | · | · | 0 Direct | -100.00% | Disposed | (price as of 2026-10-06) |
| Aug. 2, 2018 | MRK | S | 5,000 | $65.01 | $325,050 | 16,175 Direct | -23.61% | Disposed | 128.8% (price as of 2026-10-06) |
| May 4, 2018 | MRK | A | 3,636 | · | · | 3,636 Direct | · | Acquired | (price as of 2026-10-06) |
| May 4, 2018 | MRK | A | 25,617 | · | · | 25,617 Direct | · | Acquired | (price as of 2026-10-06) |
| May 1, 2018 | MRK | M | 3,007 | · | · | 22,205 Direct | +15.66% | Acquired | (price as of 2026-10-06) |
| May 1, 2018 | MRK | F | 1,030 | $58.87 | $60,636 | 21,175 Direct | -4.64% | Disposed | 152.7% (price as of 2026-10-06) |
| May 1, 2018 | MRK | M | 3,007 | $58.87 | $177,022 | 0 Direct | -100.00% | Disposed | 152.7% (price as of 2026-10-06) |
| Feb. 27, 2018 | MRK | A | 3,090 | $54.72 | $169,085 | 19,198 Direct | +19.18% | Acquired | 171.8% (price as of 2026-10-06) |
| May 9, 2017 | MRK | M | 2,576 | · | · | 17,068 Direct | +17.78% | Acquired | (price as of 2026-10-06) |
| May 9, 2017 | MRK | F | 960 | $64.01 | $61,450 | 16,108 Direct | -5.62% | Disposed | 132.4% (price as of 2026-10-06) |
| May 9, 2017 | MRK | M | 2,576 | $64.01 | $164,890 | 0 Direct | -100.00% | Disposed | 132.4% (price as of 2026-10-06) |
| May 5, 2017 | MRK | A | 3,283 | · | · | 3,283 Direct | · | Acquired | (price as of 2026-10-06) |
| May 5, 2017 | MRK | A | 29,957 | · | · | 29,957 Direct | · | Acquired | (price as of 2026-10-06) |
| Feb. 27, 2017 | MRK | A | 2,797 | $65.85 | $184,182 | 14,472 Direct | +23.96% | Acquired | 125.9% (price as of 2026-10-06) |
| Feb. 14, 2017 | MRK | S | 2,954 | $64.73 | $191,212 | 11,675 Direct | -20.19% | Disposed | 129.8% (price as of 2026-10-06) |
| May 10, 2016 | MRK | A | 40,747 | · | · | 40,747 Direct | · | Acquired | (price as of 2026-10-06) |
| May 10, 2016 | MRK | A | 3,292 | · | · | 3,292 Direct | · | Acquired | (price as of 2026-10-06) |
| May 6, 2016 | MRK | M | 2,001 | $54.09 | $108,234 | 0 Direct | -100.00% | Disposed | 175.0% (price as of 2026-10-06) |
| May 6, 2016 | MRK | F | 746 | $54.09 | $40,351 | 14,629 Direct | -4.85% | Disposed | 175.0% (price as of 2026-10-06) |
| May 6, 2016 | MRK | M | 2,001 | · | · | 15,375 Direct | +14.96% | Acquired | (price as of 2026-10-06) |
| May 2, 2015 | MRK | M | 4,709 | $59.86 | $281,881 | 0 Direct | -100.00% | Disposed | 148.5% (price as of 2026-10-06) |
| May 2, 2015 | MRK | F | 1,755 | $59.86 | $105,054 | 13,374 Direct | -11.60% | Disposed | 148.5% (price as of 2026-10-06) |
| May 1, 2015 | MRK | A | 37,152 | · | · | 37,152 Direct | · | Acquired | (price as of 2026-10-06) |
| May 1, 2015 | MRK | A | 3,007 | · | · | 3,007 Direct | · | Acquired | (price as of 2026-10-06) |
Showing latest 100 of 106 transactions
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 5, 2026 | CHRS | Stock Option (Right to Buy) | Common Stock | $1.45 | June 5, 2036 | 60,000 | Acquired |
| June 12, 2025 | CHRS | Stock Option (Right to Buy) | Common Stock | $0.79 | June 12, 2035 | 112,000 | Acquired |
| June 4, 2024 | CHRS | Stock Option (Right to Buy) | Common Stock | $1.78 | June 4, 2034 | 168,000 | Acquired |
| May 4, 2023 | MRK | Stock Option (Right to Buy) | Common Stock | $62.07 | May 4, 2027 | 15,875 | Disposed |
| May 4, 2023 | MRK | Restricted Stock Unit | Common Stock | · | May 4, 2024 | 949 | Disposed |
| May 3, 2023 | MRK | Restricted Stock Unit | Common Stock | · | May 3, 2025 | 803 | Disposed |
| May 2, 2023 | MRK | Restricted Stock Unit | Common Stock | · | May 2, 2026 | 1,781 | Acquired |
| May 2, 2023 | MRK | Stock Option (Right to Buy) | Common Stock | $117.89 | May 1, 2033 | 9,682 | Acquired |
| May 1, 2023 | MRK | Restricted Stock Unit | Common Stock | · | May 1, 2023 | 930 | Disposed |
| Oct. 28, 2022 | MRK | Stock Option (Right to Buy) | Common Stock | · | May 4, 2027 | 15,000 | Disposed |
| Oct. 28, 2022 | MRK | Stock Option (Right to Buy) | Common Stock | $53.06 | May 9, 2026 | 16,997 | Disposed |
| May 4, 2022 | MRK | Restricted Stock Unit | Common Stock | · | May 4, 2024 | 949 | Disposed |
| May 3, 2022 | MRK | Stock Option (Right to Buy) | Common Stock | $87.10 | May 2, 2032 | 13,592 | Acquired |
| May 3, 2022 | MRK | Restricted Stock Unit | Common Stock | · | May 3, 2025 | 2,411 | Acquired |
| May 3, 2022 | MRK | Restricted Stock Unit | Common Stock | · | May 3, 2022 | 902 | Disposed |
| May 1, 2022 | MRK | Restricted Stock Unit | Common Stock | · | May 1, 2023 | 928 | Disposed |
| Nov. 3, 2021 | MRK | Stock Option (Right to Buy) | Common Stock | · | May 9, 2026 | 25,000 | Disposed |
| May 4, 2021 | MRK | Restricted Stock Unit | Common Stock | · | May 4, 2021 | 1,212 | Disposed |
| May 4, 2021 | MRK | Restricted Stock Unit | Common Stock | · | May 4, 2024 | 2,764 | Acquired |
| May 4, 2021 | MRK | Stock Option (Right to Buy) | Common Stock | $75.99 | May 3, 2031 | 21,429 | Acquired |
| May 3, 2021 | MRK | Restricted Stock Unit | Common Stock | · | May 3, 2022 | 875 | Disposed |
| May 1, 2021 | MRK | Restricted Stock Unit | Common Stock | · | May 1, 2023 | 901 | Disposed |
| May 5, 2020 | MRK | Restricted Stock Unit | Common Stock | · | May 5, 2020 | 3,283 | Disposed |
| May 4, 2020 | MRK | Restricted Stock Unit | Common Stock | · | May 4, 2021 | 1,212 | Disposed |
| May 3, 2020 | MRK | Restricted Stock Unit | Common Stock | · | May 3, 2022 | 875 | Disposed |
| May 1, 2020 | MRK | Restricted Stock Unit | Common Stock | · | May 1, 2023 | 2,704 | Acquired |
| May 1, 2020 | MRK | Stock Option (Right to Buy) | Common Stock | $77.67 | April 30, 2030 | 21,144 | Acquired |
| May 10, 2019 | MRK | Restricted Stock Unit | Common Stock | · | May 10, 2019 | 3,292 | Disposed |
| May 4, 2019 | MRK | Restricted Stock Unit | Common Stock | · | May 4, 2021 | 1,212 | Disposed |
| May 3, 2019 | MRK | Restricted Stock Unit | Common Stock | · | May 3, 2022 | 2,625 | Acquired |
| May 3, 2019 | MRK | Stock Option (right to buy) | Common Stock | $80.00 | May 2, 2029 | 19,759 | Acquired |
| Feb. 14, 2019 | MRK | Stock Option (right to buy) | Common Stock | $59.86 | April 30, 2025 | 37,152 | Disposed |
| Feb. 14, 2019 | MRK | Stock Option (right to buy) | Common Stock | $58.22 | May 8, 2024 | 27,510 | Disposed |
| May 4, 2018 | MRK | Restricted Stock Unit | Common Stock | · | May 4, 2021 | 3,636 | Acquired |
| May 4, 2018 | MRK | Stock Option (right to buy) | Common Stock | $57.75 | May 3, 2028 | 25,617 | Acquired |
| May 1, 2018 | MRK | Restricted Stock Unit | Common Stock | · | May 1, 2018 | 3,007 | Disposed |
| May 9, 2017 | MRK | Restricted Stock Unit | Common Stock | · | May 9, 2017 | 2,576 | Disposed |
| May 5, 2017 | MRK | Restricted Stock Unit | Common Stock | · | May 5, 2020 | 3,283 | Acquired |
| May 5, 2017 | MRK | Stock Option (right to buy) | Common Stock | $63.97 | May 4, 2027 | 29,957 | Acquired |
| May 10, 2016 | MRK | Stock Option (right to buy) | Common Stock | $54.68 | May 9, 2026 | 40,747 | Acquired |
| May 10, 2016 | MRK | Restricted Stock Unit | Common Stock | · | May 10, 2019 | 3,292 | Acquired |
| May 6, 2016 | MRK | Restricted Stock Unit | Common Stock | · | May 6, 2016 | 2,001 | Disposed |
| May 2, 2015 | MRK | Restricted Stock Unit | Common Stock | · | May 2, 2015 | 4,709 | Disposed |
| May 1, 2015 | MRK | Stock Option (right to buy) | Common Stock | $59.86 | April 30, 2025 | 37,152 | Acquired |
| May 1, 2015 | MRK | Restricted Stock Unit | Common Stock | · | May 1, 2018 | 3,007 | Acquired |
| May 9, 2014 | MRK | Stock Option (right to buy) | Common Stock | $58.22 | May 8, 2024 | 27,510 | Acquired |
| May 9, 2014 | MRK | Restricted Stock Unit | Common Stock | · | May 9, 2017 | 2,576 | Acquired |
| May 4, 2014 | MRK | Restricted Stock Unit | Common Stock | · | May 4, 2014 | 4,240 | Disposed |
Exercise/conversion price is blank when not applicable (e.g. RSUs).
Initial ownership (Form 3) 4 holdings
Securities held when first becoming an insider, per SEC Form 3.