Rita A Karachun

Insider

First SEC filing: June 9, 2026 · Latest: June 9, 2026

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Insider at Companies where this person is a reporting insider.
Insider transactions Every share this person bought or sold, from Form 4 filings.
Derivatives Options and other derivative holdings reported by this person.
Initial holdings The stakes this person held when they first started reporting.

Insider at

Insider transactions

0 buys (P) 0 sells (S) Net: $0 + 94 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

94 other filings hidden

Date	Ticker	Code	Shares	Price	Value	Owned after	Δ own	A/D	vs now
June 5, 2026	CHRS	A	30,000	—	—	30,000	—	—	(price as of 2026-08-21)
May 4, 2023	MRK	M	15,875	—	—	0 Direct	-100.00%	Disposed	(price as of 2026-08-21)
May 4, 2023	MRK	M	949	—	—	951 Direct	-49.95%	Disposed	(price as of 2026-08-21)
May 4, 2023	MRK	S	15,875	$117.53	$1,865,789	45,710 Direct	-25.78%	Disposed	29.0% (price as of 2026-08-21)
May 4, 2023	MRK	M	15,875	$62.07	$985,361	61,585 Direct	+34.73%	Acquired	144.3% (price as of 2026-08-21)
May 4, 2023	MRK	F	326	$118.22	$38,540	45,710 Direct	-0.71%	Disposed	28.3% (price as of 2026-08-21)
May 4, 2023	MRK	M	949	$118.22	$112,191	46,036 Direct	+2.10%	Acquired	28.3% (price as of 2026-08-21)
May 3, 2023	MRK	M	803	—	—	1,608 Direct	-33.31%	Disposed	(price as of 2026-08-21)
May 3, 2023	MRK	F	276	$117.89	$32,538	45,087 Direct	-0.61%	Disposed	28.6% (price as of 2026-08-21)
May 3, 2023	MRK	M	803	$117.89	$94,666	45,363 Direct	+1.80%	Acquired	28.6% (price as of 2026-08-21)
May 2, 2023	MRK	A	1,781	—	—	1,781 Direct	—	Acquired	(price as of 2026-08-21)
May 2, 2023	MRK	A	9,682	—	—	9,682 Direct	—	Acquired	(price as of 2026-08-21)
May 1, 2023	MRK	M	930	—	—	0 Direct	-100.00%	Disposed	(price as of 2026-08-21)
May 1, 2023	MRK	F	319	$115.47	$36,835	44,560 Direct	-0.71%	Disposed	31.3% (price as of 2026-08-21)
May 1, 2023	MRK	M	930	$115.47	$107,387	44,879 Direct	+2.12%	Acquired	31.3% (price as of 2026-08-21)
Jan. 23, 2023	MRK	A	2,846	$109.88	$312,718	43,949 Direct	+6.92%	Acquired	38.0% (price as of 2026-08-21)
Oct. 28, 2022	MRK	M	15,000	—	—	15,875 Direct	-48.58%	Disposed	(price as of 2026-08-21)
Oct. 28, 2022	MRK	M	16,997	—	—	0 Direct	-100.00%	Disposed	(price as of 2026-08-21)
Oct. 28, 2022	MRK	S	31,997	$100.34	$3,210,579	41,103 Direct	-43.77%	Disposed	51.1% (price as of 2026-08-21)
Oct. 28, 2022	MRK	M	15,000	—	—	73,100 Direct	+25.82%	Acquired	(price as of 2026-08-21)
Oct. 28, 2022	MRK	M	16,997	—	—	58,100 Direct	+41.35%	Acquired	(price as of 2026-08-21)
May 4, 2022	MRK	M	949	$87.10	$82,658	41,429 Direct	+2.34%	Acquired	74.1% (price as of 2026-08-21)
May 4, 2022	MRK	F	326	$87.10	$28,395	41,103 Direct	-0.79%	Disposed	74.1% (price as of 2026-08-21)
May 4, 2022	MRK	M	949	—	—	1,900 Direct	-33.31%	Disposed	(price as of 2026-08-21)
May 3, 2022	MRK	A	13,592	—	—	13,592 Direct	—	Acquired	(price as of 2026-08-21)
May 3, 2022	MRK	A	2,411	—	—	2,411 Direct	—	Acquired	(price as of 2026-08-21)
May 3, 2022	MRK	M	902	—	—	0 Direct	-100.00%	Disposed	(price as of 2026-08-21)
May 3, 2022	MRK	F	309	$87.65	$27,084	40,480 Direct	-0.76%	Disposed	73.0% (price as of 2026-08-21)
May 3, 2022	MRK	M	902	$87.65	$79,060	40,789 Direct	+2.26%	Acquired	73.0% (price as of 2026-08-21)
May 1, 2022	MRK	F	318	$88.69	$28,203	39,887 Direct	-0.79%	Disposed	71.0% (price as of 2026-08-21)
May 1, 2022	MRK	M	928	—	—	930 Direct	-49.95%	Disposed	(price as of 2026-08-21)
May 1, 2022	MRK	M	928	$88.69	$82,304	40,205 Direct	+2.36%	Acquired	71.0% (price as of 2026-08-21)
Feb. 24, 2022	MRK	A	3,478	$73.51	$255,668	39,277 Direct	+9.72%	Acquired	106.3% (price as of 2026-08-21)
Nov. 3, 2021	MRK	M	25,000	—	—	16,997 Direct	-59.53%	Disposed	(price as of 2026-08-21)
Nov. 3, 2021	MRK	S	25,000	$88.45	$2,211,250	35,799 Direct	-41.12%	Disposed	71.5% (price as of 2026-08-21)
Nov. 3, 2021	MRK	M	25,000	—	—	60,799 Direct	+69.83%	Acquired	(price as of 2026-08-21)
May 4, 2021	MRK	M	1,212	—	—	0 Direct	-100.00%	Disposed	(price as of 2026-08-21)
May 4, 2021	MRK	A	2,764	—	—	2,764 Direct	—	Acquired	(price as of 2026-08-21)
May 4, 2021	MRK	A	21,429	—	—	21,429 Direct	—	Acquired	(price as of 2026-08-21)
May 4, 2021	MRK	F	416	$75.98	$31,608	35,799 Direct	-1.15%	Disposed	109.2% (price as of 2026-08-21)
May 4, 2021	MRK	M	1,212	$75.98	$92,088	36,215 Direct	+3.46%	Acquired	109.2% (price as of 2026-08-21)
May 3, 2021	MRK	M	875	—	—	875 Direct	-50.00%	Disposed	(price as of 2026-08-21)
May 3, 2021	MRK	F	300	$74.50	$22,350	35,003 Direct	-0.85%	Disposed	113.3% (price as of 2026-08-21)
May 3, 2021	MRK	M	875	$74.50	$65,188	35,303 Direct	+2.54%	Acquired	113.3% (price as of 2026-08-21)
May 1, 2021	MRK	M	901	—	—	1,803 Direct	-33.32%	Disposed	(price as of 2026-08-21)
May 1, 2021	MRK	F	309	$74.50	$23,020	34,428 Direct	-0.89%	Disposed	113.3% (price as of 2026-08-21)
May 1, 2021	MRK	M	901	$74.50	$67,124	34,737 Direct	+2.66%	Acquired	113.3% (price as of 2026-08-21)
Feb. 26, 2021	MRK	A	6,052	$72.62	$439,496	33,836 Direct	+21.78%	Acquired	118.9% (price as of 2026-08-21)
May 5, 2020	MRK	M	3,283	—	—	0 Direct	-100.00%	Disposed	(price as of 2026-08-21)
May 5, 2020	MRK	F	1,617	$76.86	$124,283	27,784 Direct	-5.50%	Disposed	106.8% (price as of 2026-08-21)
May 5, 2020	MRK	M	3,283	$76.86	$252,331	29,401 Direct	+12.57%	Acquired	106.8% (price as of 2026-08-21)
May 4, 2020	MRK	M	1,212	—	—	1,212 Direct	-50.00%	Disposed	(price as of 2026-08-21)
May 4, 2020	MRK	F	597	$77.67	$46,369	26,118 Direct	-2.23%	Disposed	104.6% (price as of 2026-08-21)
May 4, 2020	MRK	M	1,212	$77.67	$94,136	26,715 Direct	+4.75%	Acquired	104.6% (price as of 2026-08-21)
May 3, 2020	MRK	M	875	—	—	1,750 Direct	-33.33%	Disposed	(price as of 2026-08-21)
May 3, 2020	MRK	F	431	$77.67	$33,476	25,503 Direct	-1.66%	Disposed	104.6% (price as of 2026-08-21)
May 3, 2020	MRK	M	875	$77.67	$67,961	25,934 Direct	+3.49%	Acquired	104.6% (price as of 2026-08-21)
May 1, 2020	MRK	A	2,704	—	—	2,704 Direct	—	Acquired	(price as of 2026-08-21)
May 1, 2020	MRK	A	21,144	—	—	21,144 Direct	—	Acquired	(price as of 2026-08-21)
Feb. 28, 2020	MRK	A	4,269	$76.56	$326,835	25,059 Direct	+20.53%	Acquired	107.6% (price as of 2026-08-21)
May 10, 2019	MRK	F	1,622	$78.33	$127,051	20,790 Direct	-7.24%	Disposed	102.9% (price as of 2026-08-21)
May 10, 2019	MRK	M	3,292	$78.33	$257,862	0 Direct	-100.00%	Disposed	102.9% (price as of 2026-08-21)
May 10, 2019	MRK	M	3,292	—	—	22,412 Direct	+17.22%	Acquired	(price as of 2026-08-21)
May 4, 2019	MRK	M	1,212	$80.00	$96,960	2,424 Direct	-33.33%	Disposed	98.7% (price as of 2026-08-21)
May 4, 2019	MRK	F	597	$80.00	$47,760	19,120 Direct	-3.03%	Disposed	98.7% (price as of 2026-08-21)
May 4, 2019	MRK	M	1,212	—	—	19,717 Direct	+6.55%	Acquired	(price as of 2026-08-21)
May 3, 2019	MRK	A	2,625	—	—	2,625 Direct	—	Acquired	(price as of 2026-08-21)
May 3, 2019	MRK	A	19,759	—	—	19,759 Direct	—	Acquired	(price as of 2026-08-21)
Feb. 25, 2019	MRK	A	2,330	$80.38	$187,285	18,505 Direct	+14.40%	Acquired	97.7% (price as of 2026-08-21)
Feb. 14, 2019	MRK	M	37,152	$59.86	$2,223,919	53,327 Direct	+229.69%	Acquired	165.5% (price as of 2026-08-21)
Feb. 14, 2019	MRK	M	27,510	$58.22	$1,601,632	80,837 Direct	+51.59%	Acquired	173.0% (price as of 2026-08-21)
Feb. 14, 2019	MRK	S	64,662	$78.96	$5,105,712	16,175 Direct	-79.99%	Disposed	101.3% (price as of 2026-08-21)
Feb. 14, 2019	MRK	M	37,152	—	—	0 Direct	-100.00%	Disposed	(price as of 2026-08-21)
Feb. 14, 2019	MRK	M	27,510	—	—	0 Direct	-100.00%	Disposed	(price as of 2026-08-21)
Aug. 2, 2018	MRK	S	5,000	$65.01	$325,050	16,175 Direct	-23.61%	Disposed	144.5% (price as of 2026-08-21)
May 4, 2018	MRK	A	3,636	—	—	3,636 Direct	—	Acquired	(price as of 2026-08-21)
May 4, 2018	MRK	A	25,617	—	—	25,617 Direct	—	Acquired	(price as of 2026-08-21)
May 1, 2018	MRK	M	3,007	—	—	22,205 Direct	+15.66%	Acquired	(price as of 2026-08-21)
May 1, 2018	MRK	F	1,030	$58.87	$60,636	21,175 Direct	-4.64%	Disposed	170.0% (price as of 2026-08-21)
May 1, 2018	MRK	M	3,007	$58.87	$177,022	0 Direct	-100.00%	Disposed	170.0% (price as of 2026-08-21)
Feb. 27, 2018	MRK	A	3,090	$54.72	$169,085	19,198 Direct	+19.18%	Acquired	190.5% (price as of 2026-08-21)
May 9, 2017	MRK	M	2,576	—	—	17,068 Direct	+17.78%	Acquired	(price as of 2026-08-21)
May 9, 2017	MRK	F	960	$64.01	$61,450	16,108 Direct	-5.62%	Disposed	148.3% (price as of 2026-08-21)
May 9, 2017	MRK	M	2,576	$64.01	$164,890	0 Direct	-100.00%	Disposed	148.3% (price as of 2026-08-21)
May 5, 2017	MRK	A	3,283	—	—	3,283 Direct	—	Acquired	(price as of 2026-08-21)
May 5, 2017	MRK	A	29,957	—	—	29,957 Direct	—	Acquired	(price as of 2026-08-21)
Feb. 27, 2017	MRK	A	2,797	$65.85	$184,182	14,472 Direct	+23.96%	Acquired	141.4% (price as of 2026-08-21)
Feb. 14, 2017	MRK	S	2,954	$64.73	$191,212	11,675 Direct	-20.19%	Disposed	145.5% (price as of 2026-08-21)
May 10, 2016	MRK	A	40,747	—	—	40,747 Direct	—	Acquired	(price as of 2026-08-21)
May 10, 2016	MRK	A	3,292	—	—	3,292 Direct	—	Acquired	(price as of 2026-08-21)
May 6, 2016	MRK	M	2,001	$54.09	$108,234	0 Direct	-100.00%	Disposed	193.8% (price as of 2026-08-21)
May 6, 2016	MRK	F	746	$54.09	$40,351	14,629 Direct	-4.85%	Disposed	193.8% (price as of 2026-08-21)
May 6, 2016	MRK	M	2,001	—	—	15,375 Direct	+14.96%	Acquired	(price as of 2026-08-21)
May 2, 2015	MRK	M	4,709	$59.86	$281,881	0 Direct	-100.00%	Disposed	165.5% (price as of 2026-08-21)
May 2, 2015	MRK	F	1,755	$59.86	$105,054	13,374 Direct	-11.60%	Disposed	165.5% (price as of 2026-08-21)
May 2, 2015	MRK	M	4,709	—	—	15,129 Direct	+45.19%	Acquired	(price as of 2026-08-21)
May 1, 2015	MRK	A	37,152	—	—	37,152 Direct	—	Acquired	(price as of 2026-08-21)
May 1, 2015	MRK	A	3,007	—	—	3,007 Direct	—	Acquired	(price as of 2026-08-21)
May 9, 2014	MRK	A	27,510	—	—	27,510 Direct	—	Acquired	(price as of 2026-08-21)
May 9, 2014	MRK	A	2,576	—	—	2,576 Direct	—	Acquired	(price as of 2026-08-21)

Showing latest 100 of 103 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
May 4, 2023	MRK	Stock Option (Right to Buy)	Common Stock (15,875)	$62.07	May 4, 2027	15,875	Disposed
May 4, 2023	MRK	Restricted Stock Unit	Common Stock (949)	—	May 4, 2024	949	Disposed
May 3, 2023	MRK	Restricted Stock Unit	Common Stock (803)	—	May 3, 2025	803	Disposed
May 2, 2023	MRK	Restricted Stock Unit	Common Stock (1,781)	—	May 2, 2026	1,781	Acquired
May 2, 2023	MRK	Stock Option (Right to Buy)	Common Stock (9,682)	$117.89	May 1, 2033	9,682	Acquired
May 1, 2023	MRK	Restricted Stock Unit	Common Stock (930)	—	May 1, 2023	930	Disposed
Oct. 28, 2022	MRK	Stock Option (Right to Buy)	Common Stock (15,000)	—	May 4, 2027	15,000	Disposed
Oct. 28, 2022	MRK	Stock Option (Right to Buy)	Common Stock (16,997)	$53.06	May 9, 2026	16,997	Disposed
May 4, 2022	MRK	Restricted Stock Unit	Common Stock (949)	—	May 4, 2024	949	Disposed
May 3, 2022	MRK	Stock Option (Right to Buy)	Common Stock (13,592)	$87.10	May 2, 2032	13,592	Acquired
May 3, 2022	MRK	Restricted Stock Unit	Common Stock (2,411)	—	May 3, 2025	2,411	Acquired
May 3, 2022	MRK	Restricted Stock Unit	Common Stock (902)	—	May 3, 2022	902	Disposed
May 1, 2022	MRK	Restricted Stock Unit	Common Stock (928)	—	May 1, 2023	928	Disposed
Nov. 3, 2021	MRK	Stock Option (Right to Buy)	Common Stock (25,000)	—	May 9, 2026	25,000	Disposed
May 4, 2021	MRK	Restricted Stock Unit	Common Stock (1,212)	—	May 4, 2021	1,212	Disposed
May 4, 2021	MRK	Restricted Stock Unit	Common Stock (2,764)	—	May 4, 2024	2,764	Acquired
May 4, 2021	MRK	Stock Option (Right to Buy)	Common Stock (21,429)	$75.99	May 3, 2031	21,429	Acquired
May 3, 2021	MRK	Restricted Stock Unit	Common Stock (875)	—	May 3, 2022	875	Disposed
May 1, 2021	MRK	Restricted Stock Unit	Common Stock (901)	—	May 1, 2023	901	Disposed
May 5, 2020	MRK	Restricted Stock Unit	Common Stock (3,283)	—	May 5, 2020	3,283	Disposed
May 4, 2020	MRK	Restricted Stock Unit	Common Stock (1,212)	—	May 4, 2021	1,212	Disposed
May 3, 2020	MRK	Restricted Stock Unit	Common Stock (875)	—	May 3, 2022	875	Disposed
May 1, 2020	MRK	Restricted Stock Unit	Common Stock (2,704)	—	May 1, 2023	2,704	Acquired
May 1, 2020	MRK	Stock Option (Right to Buy)	Common Stock (21,144)	$77.67	April 30, 2030	21,144	Acquired
May 10, 2019	MRK	Restricted Stock Unit	Common Stock (3,292)	—	May 10, 2019	3,292	Disposed
May 4, 2019	MRK	Restricted Stock Unit	Common Stock (1,212)	—	May 4, 2021	1,212	Disposed
May 3, 2019	MRK	Restricted Stock Unit	Common Stock (2,625)	—	May 3, 2022	2,625	Acquired
May 3, 2019	MRK	Stock Option (right to buy)	Common Stock (19,759)	$80.00	May 2, 2029	19,759	Acquired
Feb. 14, 2019	MRK	Stock Option (right to buy)	Common Stock (37,152)	$59.86	April 30, 2025	37,152	Disposed
Feb. 14, 2019	MRK	Stock Option (right to buy)	Common Stock (27,510)	$58.22	May 8, 2024	27,510	Disposed
May 4, 2018	MRK	Restricted Stock Unit	Common Stock (3,636)	—	May 4, 2021	3,636	Acquired
May 4, 2018	MRK	Stock Option (right to buy)	Common Stock (25,617)	$57.75	May 3, 2028	25,617	Acquired
May 1, 2018	MRK	Restricted Stock Unit	Common Stock (3,007)	—	May 1, 2018	3,007	Disposed
May 9, 2017	MRK	Restricted Stock Unit	Common Stock (2,576)	—	May 9, 2017	2,576	Disposed
May 5, 2017	MRK	Restricted Stock Unit	Common Stock (3,283)	—	May 5, 2020	3,283	Acquired
May 5, 2017	MRK	Stock Option (right to buy)	Common Stock (29,957)	$63.97	May 4, 2027	29,957	Acquired
May 10, 2016	MRK	Stock Option (right to buy)	Common Stock (40,747)	$54.68	May 9, 2026	40,747	Acquired
May 10, 2016	MRK	Restricted Stock Unit	Common Stock (3,292)	—	May 10, 2019	3,292	Acquired
May 6, 2016	MRK	Restricted Stock Unit	Common Stock (2,001)	—	May 6, 2016	2,001	Disposed
May 2, 2015	MRK	Restricted Stock Unit	Common Stock (4,709)	—	May 2, 2015	4,709	Disposed
May 1, 2015	MRK	Stock Option (right to buy)	Common Stock (37,152)	$59.86	April 30, 2025	37,152	Acquired
May 1, 2015	MRK	Restricted Stock Unit	Common Stock (3,007)	—	May 1, 2018	3,007	Acquired
May 9, 2014	MRK	Stock Option (right to buy)	Common Stock (27,510)	$58.22	May 8, 2024	27,510	Acquired
May 9, 2014	MRK	Restricted Stock Unit	Common Stock (2,576)	—	May 9, 2017	2,576	Acquired
May 4, 2014	MRK	Restricted Stock Unit	Common Stock (4,240)	—	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.

Date	Ticker	Security	Shares	Ownership
March 5, 2014	MRK	Common Stock	7,758	Direct
March 5, 2014	MRK	Restricted Stock Unit→ Common Stock (4,709)	4,709	Direct
March 5, 2014	MRK	Restricted Stock Unit→ Common Stock (4,240)	4,240	Direct
March 5, 2014	MRK	Restricted Stock Unit→ Common Stock (2,001)	2,001	Direct