George Bickerstaff

Insider

First SEC filing: Dec. 21, 2017 · Latest: Dec. 21, 2017

On this page

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) 1 sells (S) Net: $-925,600 + 86 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

86 other filings hidden

Date	Ticker	Code	Shares	Price	Value	Owned after	Δ own	A/D	vs now
Aug. 5, 2026	CDNA	S	20,000	$46.28	$925,600	134,061 Direct	-12.98%	Disposed	2.1% (price as of 2026-08-20)
June 12, 2026	CDNA	A	9,795	—	—	154,061 Direct	+6.79%	Acquired	(price as of 2026-08-20)
June 13, 2025	CDNA	A	12,103	—	—	115,130 Direct	+11.75%	Acquired	(price as of 2026-08-20)
March 10, 2025	CDNA	S	20,000	$18.36	$367,200	103,027 Direct	-16.26%	Disposed	157.4% (price as of 2026-08-20)
Nov. 1, 2024	CDNA	M	2,226	—	—	0 Direct	-100.00%	Disposed	(price as of 2026-08-20)
Nov. 1, 2024	CDNA	M	5,255	—	—	0 Direct	-100.00%	Disposed	(price as of 2026-08-20)
Nov. 1, 2024	CDNA	M	2,226	$5.49	$12,221	123,027 Direct	+1.84%	Acquired	760.7% (price as of 2026-08-20)
Nov. 1, 2024	CDNA	M	5,255	$5.85	$30,742	120,801 Direct	+4.55%	Acquired	707.7% (price as of 2026-08-20)
June 14, 2024	CDNA	A	16,048	—	—	16,048 Direct	—	Acquired	(price as of 2026-08-20)
June 14, 2024	CDNA	A	16,048	—	—	16,048 Direct	—	Acquired	(price as of 2026-08-20)
June 14, 2024	CDNA	A	10,570	—	—	115,546 Direct	+10.07%	Acquired	(price as of 2026-08-20)
May 14, 2024	CDNA	M	5,255	—	—	0 Direct	-100.00%	Disposed	(price as of 2026-08-20)
May 14, 2024	CDNA	M	5,255	$10.00	$52,550	104,976 Direct	+5.27%	Acquired	372.5% (price as of 2026-08-20)
Aug. 11, 2023	CDNA	M	4,453	—	—	2,226 Direct	-66.67%	Disposed	(price as of 2026-08-20)
Aug. 11, 2023	CDNA	M	9,745	—	—	0 Direct	-100.00%	Disposed	(price as of 2026-08-20)
Aug. 11, 2023	CDNA	M	5,255	—	—	0 Direct	-100.00%	Disposed	(price as of 2026-08-20)
Aug. 11, 2023	CDNA	M	4,453	$5.49	$24,447	99,721 Direct	+4.67%	Acquired	760.7% (price as of 2026-08-20)
Aug. 11, 2023	CDNA	M	9,745	$4.95	$48,238	95,268 Direct	+11.39%	Acquired	854.5% (price as of 2026-08-20)
Aug. 11, 2023	CDNA	M	5,255	$5.02	$26,380	85,523 Direct	+6.55%	Acquired	841.2% (price as of 2026-08-20)
June 16, 2023	CDNA	A	29,136	—	—	29,136 Direct	—	Acquired	(price as of 2026-08-20)
June 16, 2023	CDNA	A	18,844	—	—	80,268 Direct	+30.68%	Acquired	(price as of 2026-08-20)
Jan. 6, 2023	CDNA	A	1,323	—	—	61,424 Direct	+2.20%	Acquired	(price as of 2026-08-20)
Nov. 23, 2022	CDNA	M	15,000	—	—	0 Direct	-100.00%	Disposed	(price as of 2026-08-20)
Nov. 23, 2022	CDNA	M	15,000	$1.22	$18,300	60,101 Direct	+33.26%	Acquired	3773.0% (price as of 2026-08-20)
Oct. 4, 2022	CDNA	A	986	—	—	45,101 Direct	+2.24%	Acquired	(price as of 2026-08-20)
July 1, 2022	CDNA	A	812	—	—	44,115 Direct	+1.88%	Acquired	(price as of 2026-08-20)
June 16, 2022	CDNA	A	7,606	—	—	7,606 Direct	—	Acquired	(price as of 2026-08-20)
June 16, 2022	CDNA	A	4,863	—	—	43,303 Direct	+12.65%	Acquired	(price as of 2026-08-20)
May 9, 2022	CDNA	A	223	$22.46	$5,009	38,440 Direct	+0.58%	Acquired	110.4% (price as of 2026-08-20)
April 1, 2022	CDNA	A	481	—	—	38,217 Direct	+1.27%	Acquired	(price as of 2026-08-20)
Feb. 28, 2022	CDNA	S	25,000	$39.11	$977,750	37,736 Direct	-39.85%	Disposed	20.8% (price as of 2026-08-20)
Jan. 3, 2022	CDNA	A	287	—	—	62,736 Direct	+0.46%	Acquired	(price as of 2026-08-20)
Oct. 1, 2021	CDNA	A	196	—	—	62,449 Direct	+0.31%	Acquired	(price as of 2026-08-20)
July 1, 2021	CDNA	A	188	—	—	62,253 Direct	+0.30%	Acquired	(price as of 2026-08-20)
June 16, 2021	CDNA	A	1,127	—	—	62,065 Direct	+1.85%	Acquired	(price as of 2026-08-20)
June 16, 2021	CDNA	A	1,812	—	—	1,812 Direct	—	Acquired	(price as of 2026-08-20)
May 21, 2021	CDNA	S	799	$75.97	$60,700	60,938 Direct	-1.29%	Disposed	-37.8% (price as of 2026-08-20)
May 21, 2021	CDNA	S	9,201	$75.28	$692,651	61,737 Direct	-12.97%	Disposed	-37.2% (price as of 2026-08-20)
May 12, 2021	CDNA	S	600	$63.75	$38,250	70,938 Direct	-0.84%	Disposed	-25.9% (price as of 2026-08-20)
May 12, 2021	CDNA	S	9,400	$63.03	$592,482	71,538 Direct	-11.61%	Disposed	-25.0% (price as of 2026-08-20)
April 1, 2021	CDNA	A	193	—	—	80,938 Direct	+0.24%	Acquired	(price as of 2026-08-20)
Jan. 4, 2021	CDNA	A	258	—	—	80,745 Direct	+0.32%	Acquired	(price as of 2026-08-20)
Dec. 14, 2020	CDNA	S	2,076	$72.84	$151,216	80,487 Direct	-2.51%	Disposed	-35.1% (price as of 2026-08-20)
Dec. 14, 2020	CDNA	S	3,224	$72.04	$232,257	82,563 Direct	-3.76%	Disposed	-34.4% (price as of 2026-08-20)
Dec. 14, 2020	CDNA	S	4,700	$71.10	$334,170	85,787 Direct	-5.19%	Disposed	-33.5% (price as of 2026-08-20)
Oct. 1, 2020	CDNA	A	444	—	—	90,487 Direct	+0.49%	Acquired	(price as of 2026-08-20)
July 1, 2020	CDNA	A	527	—	—	90,043 Direct	+0.59%	Acquired	(price as of 2026-08-20)
June 18, 2020	CDNA	A	4,978	$31.35	$156,060	4,978 Direct	—	Acquired	50.7% (price as of 2026-08-20)
June 18, 2020	CDNA	A	3,190	—	—	88,847 Direct	+3.72%	Acquired	(price as of 2026-08-20)
May 13, 2020	CDNA	S	10,000	$27.65	$276,500	85,657 Direct	-10.45%	Disposed	70.9% (price as of 2026-08-20)
April 1, 2020	CDNA	A	669	—	—	96,326 Direct	+0.70%	Acquired	(price as of 2026-08-20)
Jan. 2, 2020	CDNA	A	653	—	—	95,657 Direct	+0.69%	Acquired	(price as of 2026-08-20)
Oct. 1, 2019	CDNA	A	541	—	—	95,004 Direct	+0.57%	Acquired	(price as of 2026-08-20)
July 1, 2019	CDNA	A	468	—	—	94,463 Direct	+0.50%	Acquired	(price as of 2026-08-20)
June 17, 2019	CDNA	A	4,152	$38.26	$158,856	4,152 Direct	—	Acquired	23.5% (price as of 2026-08-20)
June 17, 2019	CDNA	A	2,613	—	—	93,995 Direct	+2.86%	Acquired	(price as of 2026-08-20)
April 24, 2019	INVA	A	16,399	—	—	70,161 Direct	+30.50%	Acquired	(price as of 2026-08-20)
April 16, 2019	CDNA	X	4,415	—	—	0 Direct	-100.00%	Disposed	(price as of 2026-08-20)
April 16, 2019	CDNA	X	4,415	$1.12	$4,945	91,382 Direct	+5.08%	Acquired	4118.8% (price as of 2026-08-20)
April 15, 2019	CDNA	P	4,415	$28.26	$124,768	4,415 Direct	—	Acquired	67.2% (price as of 2026-08-20)
April 1, 2019	CDNA	A	514	—	—	86,967 Direct	+0.59%	Acquired	(price as of 2026-08-20)
March 21, 2019	CDNA	X	25,000	—	—	0 Direct	-100.00%	Disposed	(price as of 2026-08-20)
March 21, 2019	CDNA	X	7,980	—	—	0 Direct	-100.00%	Disposed	(price as of 2026-08-20)
March 21, 2019	CDNA	X	25,000	$1.12	$28,000	86,453 Direct	+40.68%	Acquired	4118.8% (price as of 2026-08-20)
March 21, 2019	CDNA	X	7,980	$1.12	$8,938	61,453 Direct	+14.92%	Acquired	4118.8% (price as of 2026-08-20)
March 20, 2019	CDNA	P	25,000	$36.14	$903,500	25,000 Direct	—	Acquired	30.7% (price as of 2026-08-20)
March 20, 2019	CDNA	P	7,980	$36.14	$288,397	7,980 Direct	—	Acquired	30.7% (price as of 2026-08-20)
Jan. 2, 2019	CDNA	A	535	—	—	53,473 Direct	+1.01%	Acquired	(price as of 2026-08-20)
Oct. 1, 2018	CDNA	A	734	—	—	52,938 Direct	+1.41%	Acquired	(price as of 2026-08-20)
June 29, 2018	CDNA	A	1,197	—	—	52,204 Direct	+2.35%	Acquired	(price as of 2026-08-20)
June 20, 2018	CDNA	A	15,000	—	—	15,000 Direct	—	Acquired	(price as of 2026-08-20)
June 20, 2018	CDNA	A	5,000	—	—	51,007 Direct	+10.87%	Acquired	(price as of 2026-08-20)
April 24, 2018	INVA	A	14,249	—	—	28,762 Direct	+98.18%	Acquired	(price as of 2026-08-20)
April 2, 2018	CDNA	A	2,221	—	—	46,007 Direct	+5.07%	Acquired	(price as of 2026-08-20)
March 21, 2018	INO	M	4,090	—	—	8,180 Direct	-33.33%	Disposed	(price as of 2026-08-20)
March 21, 2018	INO	M	4,090	—	—	4,090 Direct	—	Acquired	(price as of 2026-08-20)
Jan. 2, 2018	CDNA	A	2,004	—	—	43,786 Direct	+4.80%	Acquired	(price as of 2026-08-20)
Dec. 19, 2017	INVA	A	14,513	—	—	14,513 Direct	—	Acquired	(price as of 2026-08-20)
Nov. 9, 2017	CDNA	A	6,679	—	—	6,679 Direct	—	Acquired	(price as of 2026-08-20)
Nov. 8, 2017	CDNA	D	10,948	—	—	0 Direct	-100.00%	Disposed	(price as of 2026-08-20)
Oct. 2, 2017	CDNA	A	5,951	—	—	41,782 Direct	+16.61%	Acquired	(price as of 2026-08-20)
July 13, 2017	CDNA	A	15,000	$1.22	$18,300	15,000 Direct	—	Acquired	3773.0% (price as of 2026-08-20)
July 13, 2017	CDNA	A	5,000	—	—	35,831 Direct	+16.22%	Acquired	(price as of 2026-08-20)
July 3, 2017	CDNA	A	9,910	—	—	30,831 Direct	+47.37%	Acquired	(price as of 2026-08-20)
May 12, 2017	INO	A	12,500	—	—	12,500 Direct	—	Acquired	(price as of 2026-08-20)
May 12, 2017	INO	A	7,669	—	—	7,669 Direct	—	Acquired	(price as of 2026-08-20)
April 1, 2017	CDNA	A	2,243	—	—	20,921 Direct	+12.01%	Acquired	(price as of 2026-08-20)
March 21, 2017	INO	A	12,270	—	—	12,270 Direct	—	Acquired	(price as of 2026-08-20)
March 21, 2017	INO	A	20,000	$5.86	$117,200	20,000 Direct	—	Acquired	-98.2% (price as of 2026-08-20)
Jan. 1, 2017	CDNA	A	1,443	—	—	18,678 Direct	+8.37%	Acquired	(price as of 2026-08-20)
Oct. 1, 2016	CDNA	A	1,089	—	—	17,235 Direct	+6.74%	Acquired	(price as of 2026-08-20)
July 15, 2016	CDNA	A	9,745	$4.95	$48,238	9,745 Direct	—	Acquired	854.5% (price as of 2026-08-20)
July 15, 2016	CDNA	A	5,000	—	—	16,146 Direct	+44.86%	Acquired	(price as of 2026-08-20)
July 1, 2016	CDNA	A	1,236	—	—	11,146 Direct	+12.47%	Acquired	(price as of 2026-08-20)
June 16, 2016	CDNA	A	5,255	$5.02	$26,380	5,255 Direct	—	Acquired	841.2% (price as of 2026-08-20)
April 1, 2016	CDNA	A	1,628	—	—	9,910 Direct	+19.66%	Acquired	(price as of 2026-08-20)
Jan. 1, 2016	CDNA	A	1,530	—	—	8,282 Direct	+22.66%	Acquired	(price as of 2026-08-20)
Oct. 1, 2015	CDNA	A	1,260	—	—	6,752 Direct	+22.94%	Acquired	(price as of 2026-08-20)
July 1, 2015	CDNA	A	1,534	—	—	5,492 Direct	+38.76%	Acquired	(price as of 2026-08-20)
June 17, 2015	CDNA	A	5,255	—	—	5,255 Direct	-50.00%	Disposed	(price as of 2026-08-20)

Showing latest 100 of 105 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
Nov. 1, 2024	CDNA	Stock Option (right to buy)	Common Stock (2,226)	$5.49	Nov. 9, 2024	2,226	Disposed
Nov. 1, 2024	CDNA	Stock Option (right to buy)	Common Stock (5,255)	$5.85	June 17, 2025	5,255	Disposed
June 14, 2024	CDNA	Stock Option (right to buy)	Common Stock (16,048)	—	June 14, 2034	16,048	Acquired
June 14, 2024	CDNA	Stock Option (right to buy)	Common Stock (16,048)	$9.35	June 14, 2034	16,048	Acquired
May 14, 2024	CDNA	Stock Option (right to buy)	Common Stock (5,255)	$10.00	July 21, 2024	5,255	Disposed
Aug. 11, 2023	CDNA	Option to Purchase Common Stock	Common Stock (4,453)	$5.49	Nov. 9, 2024	4,453	Disposed
Aug. 11, 2023	CDNA	Stock Option (right to buy)	Common Stock (9,745)	$4.95	July 15, 2026	9,745	Disposed
Aug. 11, 2023	CDNA	Stock Option (right to buy)	Common Stock (5,255)	$5.02	June 16, 2026	5,255	Disposed
June 16, 2023	CDNA	Common Stock	Common Stock (29,136)	$7.96	June 16, 2033	29,136	Acquired
Nov. 23, 2022	CDNA	Stock Option (right to buy)	Common Stock (15,000)	$1.22	July 13, 2027	15,000	Disposed
June 16, 2022	CDNA	Common Stock	Common Stock (7,606)	$20.56	June 16, 2032	7,606	Acquired
June 16, 2021	CDNA	Stock Option (right to buy)	Common Stock (1,812)	$88.70	June 16, 2031	1,812	Acquired
June 18, 2020	CDNA	Stock Option (right to buy)	Common Stock (4,978)	$31.35	June 18, 2030	4,978	Acquired
June 17, 2019	CDNA	Stock Option (right to buy)	Common Stock (4,152)	$38.26	June 17, 2029	4,152	Acquired
April 16, 2019	CDNA	Warrant (right to buy)	Common Stock (4,415)	$1.12	June 17, 2023	4,415	Disposed
April 15, 2019	CDNA	Warrant (right to buy)	Common Stock (4,415)	$1.12	June 17, 2023	4,415	Acquired
March 21, 2019	CDNA	Warrant (right to buy)	Common Stock (25,000)	$1.12	June 17, 2021	25,000	Disposed
March 21, 2019	CDNA	Warrant (right to buy)	Common Stock (7,980)	$1.12	June 17, 2021	7,980	Disposed
March 20, 2019	CDNA	Warrant (right to buy)	Common Stock (25,000)	$1.12	June 17, 2021	25,000	Acquired
March 20, 2019	CDNA	Warrant (right to buy)	Common Stock (7,980)	$1.12	June 17, 2021	7,980	Acquired
June 20, 2018	CDNA	Stock Option (right to buy)	Common Stock (15,000)	$14.74	June 20, 2028	15,000	Acquired
March 21, 2018	INO	Restricted Stock Unit	Common Stock (4,090)	—	—	4,090	Disposed
Nov. 9, 2017	CDNA	Option to Purchase Common Stock [F3]	Common Stock (6,679)	—	Nov. 9, 2024	6,679	Acquired
Nov. 8, 2017	CDNA	Option to Purchase Common Stock	Common Stock (10,948)	$12.40	June 19, 2024	10,948	Disposed
July 13, 2017	CDNA	Stock Option (right to buy)	Common Stock (15,000)	$1.22	July 13, 2027	15,000	Acquired
May 12, 2017	INO	Common Stock Option	Common Stock (12,500)	$7.14	May 12, 2027	12,500	Acquired
May 12, 2017	INO	Restricted Stock Unit	Common Stock (7,669)	—	—	7,669	Acquired
March 21, 2017	INO	Restricted Stock Unit	Common Stock (12,270)	—	—	12,270	Acquired
March 21, 2017	INO	Common Stock Option	Common Stock (20,000)	$5.86	March 21, 2027	20,000	Acquired
July 15, 2016	CDNA	Stock Option (right to buy)	Common Stock (9,745)	$4.95	July 15, 2026	9,745	Acquired
June 16, 2016	CDNA	Stock Option (right to buy)	Common Stock (5,255)	$5.02	June 16, 2026	5,255	Acquired
June 17, 2015	CDNA	Stock Option (right to buy)	Common Stock (5,255)	—	June 17, 2025	5,255	Disposed
June 16, 2015	CDNA	Stock Option (right to buy)	Common Stock (5,255)	$6.08	June 16, 2025	5,255	Acquired
July 21, 2014	CDNA	Option to Purchase Common Stock	Common Stock (5,255)	$10.00	July 21, 2024	5,255	Acquired

Exercise/conversion price is blank when not applicable (e.g. RSUs).

Initial ownership (Form 3) 2 holdings

Securities held when first becoming an insider, per SEC Form 3.

Date	Ticker	Security	Shares	Ownership
Dec. 21, 2017	INVA	No securities are beneficially owned.	0	Direct
July 16, 2014	CDNA	Option to Purchase Common Stock→ Common Stock (10,948)	10,948	Direct