Frank Witney

Insider

First SEC filing: June 2, 2026 · Latest: June 2, 2026

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) 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

67 other filings hidden

Date	Ticker	Code	Shares	Price	Value	Owned after	Δ own	A/D	vs now
June 18, 2026	LAB	A	175,923	—	—	175,923 Direct	—	Acquired	(price as of 2026-08-20)
June 18, 2026	LAB	A	99,116	—	—	309,978 Direct	+47.01%	Acquired	(price as of 2026-08-20)
June 2, 2026	CERS	A	60,000	—	—	340,059 Direct	+21.42%	Acquired	(price as of 2026-08-20)
May 7, 2026	RVTY	A	1,265	—	—	23,354 Direct	+5.73%	Acquired	(price as of 2026-08-20)
May 7, 2026	RVTY	A	1,015	—	—	22,089 Direct	+4.82%	Acquired	(price as of 2026-08-20)
June 20, 2025	LAB	A	125,660	—	—	125,660 Direct	—	Acquired	(price as of 2026-08-20)
June 20, 2025	LAB	A	94,592	—	—	210,862 Direct	+81.36%	Acquired	(price as of 2026-08-20)
June 3, 2025	CERS	A	60,000	—	—	280,059 Direct	+27.27%	Acquired	(price as of 2026-08-20)
April 30, 2025	RVTY	A	1,338	—	—	21,074 Direct	+6.78%	Acquired	(price as of 2026-08-20)
April 30, 2025	RVTY	A	1,074	—	—	19,736 Direct	+5.76%	Acquired	(price as of 2026-08-20)
June 28, 2024	LAB	A	72,213	—	—	72,213 Direct	—	Acquired	(price as of 2026-08-20)
June 28, 2024	LAB	A	43,128	—	—	116,270 Direct	+58.96%	Acquired	(price as of 2026-08-20)
June 5, 2024	CERS	A	40,000	$5.00	$200,000	220,059 Direct	+22.21%	Acquired	-42.9% (price as of 2026-08-20)
May 9, 2024	CERS	P	20,000	$1.89	$37,800	180,059 Direct	+12.50%	Acquired	51.1% (price as of 2026-08-20)
May 1, 2024	RVTY	A	1,218	—	—	18,662 Direct	+6.98%	Acquired	(price as of 2026-08-20)
May 1, 2024	RVTY	A	977	—	—	17,444 Direct	+5.93%	Acquired	(price as of 2026-08-20)
June 14, 2023	LAB	A	26,376	—	—	73,142 Direct	+56.40%	Acquired	(price as of 2026-08-20)
June 14, 2023	LAB	A	35,380	—	—	35,380 Direct	—	Acquired	(price as of 2026-08-20)
June 7, 2023	CERS	A	40,000	$5.00	$200,000	160,059 Direct	+33.32%	Acquired	-42.9% (price as of 2026-08-20)
May 15, 2023	RVTY	A	955	—	—	16,467 Direct	+6.16%	Acquired	(price as of 2026-08-20)
May 15, 2023	RVTY	A	783	—	—	15,512 Direct	+5.32%	Acquired	(price as of 2026-08-20)
June 15, 2022	LAB	A	42,571	—	—	42,571 Direct	—	Acquired	(price as of 2026-08-20)
June 15, 2022	LAB	A	30,914	—	—	46,766 Direct	+195.02%	Acquired	(price as of 2026-08-20)
June 1, 2022	CERS	A	39,866	—	—	39,866 Direct	—	Acquired	(price as of 2026-08-20)
June 1, 2022	CERS	A	20,454	—	—	120,059 Direct	+20.54%	Acquired	(price as of 2026-08-20)
May 6, 2022	RVTY	A	744	—	—	14,729 Direct	+5.32%	Acquired	(price as of 2026-08-20)
May 6, 2022	RVTY	A	610	—	—	13,985 Direct	+4.56%	Acquired	(price as of 2026-08-20)
April 4, 2022	LAB	A	23,401	—	—	23,401 Direct	—	Acquired	(price as of 2026-08-20)
April 4, 2022	LAB	A	15,852	—	—	15,852 Direct	—	Acquired	(price as of 2026-08-20)
June 2, 2021	CERS	A	29,983	—	—	29,983 Direct	—	Acquired	(price as of 2026-08-20)
June 2, 2021	CERS	A	14,888	—	—	99,605 Direct	+17.57%	Acquired	(price as of 2026-08-20)
June 1, 2021	CERS	M	13,228	—	—	0 Direct	-100.00%	Disposed	(price as of 2026-08-20)
June 1, 2021	CERS	M	13,228	—	—	84,717 Direct	+18.50%	Acquired	(price as of 2026-08-20)
May 7, 2021	RVTY	A	604	—	—	12,666 Direct	+5.01%	Acquired	(price as of 2026-08-20)
May 7, 2021	RVTY	A	709	—	—	13,375 Direct	+5.60%	Acquired	(price as of 2026-08-20)
June 5, 2020	CERS	M	11,184	—	—	0 Direct	-100.00%	Disposed	(price as of 2026-08-20)
June 5, 2020	CERS	M	11,184	—	—	71,489 Direct	+18.55%	Acquired	(price as of 2026-08-20)
June 3, 2020	CERS	A	13,228	—	—	13,228 Direct	—	Acquired	(price as of 2026-08-20)
June 3, 2020	CERS	A	28,177	—	—	28,177 Direct	—	Acquired	(price as of 2026-08-20)
May 8, 2020	RVTY	A	1,081	—	—	12,062 Direct	+9.84%	Acquired	(price as of 2026-08-20)
May 8, 2020	RVTY	A	244	$92.20	$22,497	10,981 Direct	+2.27%	Acquired	30.7% (price as of 2026-08-20)
May 8, 2020	RVTY	A	922	—	—	10,737 Direct	+9.39%	Acquired	(price as of 2026-08-20)
Jan. 29, 2020	CERS	P	24,096	$4.15	$99,998	60,305 Direct	+66.55%	Acquired	-31.2% (price as of 2026-08-20)
June 5, 2019	CERS	A	11,184	—	—	11,184 Direct	—	Acquired	(price as of 2026-08-20)
June 5, 2019	CERS	A	23,703	—	—	23,703 Direct	—	Acquired	(price as of 2026-08-20)
June 4, 2019	CERS	M	10,223	—	—	0 Direct	-100.00%	Disposed	(price as of 2026-08-20)
June 4, 2019	CERS	M	10,223	—	—	36,209 Direct	+39.34%	Acquired	(price as of 2026-08-20)
April 30, 2019	RVTY	A	1,043	—	—	9,815 Direct	+11.89%	Acquired	(price as of 2026-08-20)
April 30, 2019	RVTY	A	785	—	—	8,772 Direct	+9.83%	Acquired	(price as of 2026-08-20)
June 6, 2018	CERS	A	10,223	—	—	10,223 Direct	—	Acquired	(price as of 2026-08-20)
June 6, 2018	CERS	A	19,242	—	—	19,242 Direct	—	Acquired	(price as of 2026-08-20)
June 6, 2018	CERS	A	10,223	—	—	10,223 Direct	—	Acquired	(price as of 2026-08-20)
June 6, 2018	CERS	A	16,399	—	—	16,399 Direct	—	Acquired	(price as of 2026-08-20)
June 5, 2018	CERS	M	15,853	—	—	0 Direct	-100.00%	Disposed	(price as of 2026-08-20)
June 5, 2018	CERS	M	15,853	—	—	25,986 Direct	+156.45%	Acquired	(price as of 2026-08-20)
May 3, 2018	RVTY	A	1,386	—	—	7,987 Direct	+21.00%	Acquired	(price as of 2026-08-20)
May 3, 2018	RVTY	A	1,043	—	—	6,601 Direct	+18.77%	Acquired	(price as of 2026-08-20)
June 7, 2017	CERS	A	15,853	—	—	15,853 Direct	—	Acquired	(price as of 2026-08-20)
June 7, 2017	CERS	A	38,005	—	—	38,005 Direct	—	Acquired	(price as of 2026-08-20)
June 6, 2017	CERS	M	10,133	—	—	10,133 Direct	—	Acquired	(price as of 2026-08-20)
June 6, 2017	CERS	M	10,133	—	—	0 Direct	-100.00%	Disposed	(price as of 2026-08-20)
May 9, 2017	RVTY	A	1,204	—	—	3,960 Direct	+43.69%	Acquired	(price as of 2026-08-20)
May 9, 2017	RVTY	A	1,598	—	—	5,558 Direct	+40.35%	Acquired	(price as of 2026-08-20)
Aug. 15, 2016	RVTY	A	1,526	—	—	2,756 Direct	+124.07%	Acquired	(price as of 2026-08-20)
Aug. 15, 2016	RVTY	A	1,150	—	—	1,230 Direct	+1437.50%	Acquired	(price as of 2026-08-20)
June 8, 2016	CERS	A	10,133	—	—	10,133 Direct	—	Acquired	(price as of 2026-08-20)
June 8, 2016	CERS	A	20,743	—	—	20,743 Direct	—	Acquired	(price as of 2026-08-20)
June 10, 2015	CERS	A	30,000	—	—	30,000 Direct	—	Acquired	(price as of 2026-08-20)
June 11, 2014	CERS	A	30,000	—	—	30,000 Direct	—	Acquired	(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 18, 2026	LAB	Stock Option (Right to buy)	Common Stock (175,923)	$0.83	June 18, 2036	175,923	Acquired
June 20, 2025	LAB	Stock Option (Right to buy)	Common Stock (125,660)	$1.05	June 20, 2035	125,660	Acquired
June 28, 2024	LAB	Stock Option (Right to buy)	Common Stock (72,213)	$1.77	June 28, 2034	72,213	Acquired
June 14, 2023	LAB	Stock Option (Right to Buy)	Common Stock (35,380)	$2.18	June 14, 2033	35,380	Acquired
June 15, 2022	LAB	Stock Option (Right to Buy)	Common Stock (42,571)	$1.86	June 15, 2032	42,571	Acquired
June 1, 2022	CERS	Option (Right to Buy)	Common Stock (39,866)	$4.84	May 31, 2032	39,866	Acquired
April 4, 2022	LAB	Stock Option (Right to Buy)	Common Stock (23,401)	$3.99	April 4, 2032	23,401	Acquired
June 2, 2021	CERS	Option (Right to Buy)	Common Stock (29,983)	$5.62	June 1, 2031	29,983	Acquired
June 1, 2021	CERS	Restricted Stock Unit	Common Stock (13,228)	—	—	13,228	Disposed
June 5, 2020	CERS	Restricted Stock Unit	Common Stock (11,184)	—	—	11,184	Disposed
June 3, 2020	CERS	Restricted Stock Unit	Common Stock (13,228)	—	—	13,228	Acquired
June 3, 2020	CERS	Option (Right to Buy)	Common Stock (28,177)	$6.37	June 2, 2030	28,177	Acquired
June 5, 2019	CERS	Restricted Stock Unit	Common Stock (11,184)	—	—	11,184	Acquired
June 5, 2019	CERS	Option (Right to Buy)	Common Stock (23,703)	$4.80	June 4, 2029	23,703	Acquired
June 4, 2019	CERS	Restricted Stock Unit	Common Stock (10,223)	—	—	10,223	Disposed
June 6, 2018	CERS	Restricted Stock Unit	Common Stock (10,223)	—	—	10,223	Acquired
June 6, 2018	CERS	Option (Right to Buy)	Common Stock (19,242)	$6.77	June 5, 2028	19,242	Acquired
June 6, 2018	CERS	Restricted Stock Unit	Common Stock (10,223)	—	—	10,223	Acquired
June 6, 2018	CERS	Option (Right to Buy)	Common Stock (16,399)	$6.77	June 5, 2028	16,399	Acquired
June 5, 2018	CERS	Restricted Stock Unit	Common Stock (15,853)	—	—	15,853	Disposed
June 7, 2017	CERS	Restricted Stock Unit	Common Stock (15,853)	—	—	15,853	Acquired
June 7, 2017	CERS	Option Right to Buy	Common Stock (38,005)	$2.61	June 6, 2027	38,005	Acquired
June 6, 2017	CERS	Restricted Stock Unit	Common Stock (10,133)	—	—	10,133	Disposed
June 8, 2016	CERS	Restricted Stock Unit	Common Stock (10,133)	—	—	10,133	Acquired
June 8, 2016	CERS	Option (Right to Buy)	Common Stock (20,743)	$6.08	June 7, 2026	20,743	Acquired
June 10, 2015	CERS	Option (Right to Buy)	Common Stock (30,000)	$5.40	June 9, 2025	30,000	Acquired
June 11, 2014	CERS	Option (Right to Buy)	Common Stock (30,000)	$4.34	June 10, 2024	30,000	Acquired

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

Initial ownership (Form 3) 6 holdings

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

Date	Ticker	Security	Shares	Ownership
April 16, 2026	ALMR	Stock Option (Right to Buy)→ Class B Common Stock (124,069)	124,069	Direct
April 16, 2026	ALMR	Stock Option (Right to Buy)→ Class B Common Stock (49,627)	49,627	Direct
April 16, 2026	ALMR	Stock Option (Right to Buy)→ Class B Common Stock (33,085)	33,085	Direct
April 6, 2022	LAB	Common Stock	4,225	Indirect
July 27, 2016	RVTY	Common Stock	80	Direct
March 31, 2014	CERS	Option (Right to Buy)→ Common Stock (45,000)	45,000	Direct