Melinda Litherland Pei

Insider

First SEC filing: May 1, 2017 · Latest: May 1, 2017

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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 + 14 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

14 other filings hidden

Date	Ticker	Code	Shares	Price	Value	Owned after	Δ own	A/D	vs now
May 29, 2026	RPID	A	12,787	—	—	12,787 Direct	—	Acquired	(price as of 2026-08-21)
May 29, 2026	RPID	A	12,787	—	—	12,787 Direct	—	Acquired	(price as of 2026-08-21)
May 29, 2026	RPID	A	12,787	$1.96	$25,063	100,687 Direct	+14.55%	Acquired	-14.3% (price as of 2026-08-21)
May 22, 2025	RPID	A	14,300	—	—	68,600 Direct	+26.34%	Acquired	(price as of 2026-08-21)
May 22, 2025	RPID	A	28,650	—	—	28,650 Direct	—	Acquired	(price as of 2026-08-21)
April 22, 2025	BIO	M	308	—	—	0 Direct	-100.00%	Disposed	(price as of 2026-08-21)
April 22, 2025	BIO	A	407	—	—	407 Direct	—	Acquired	(price as of 2026-08-21)
April 22, 2025	BIO	M	308	—	—	308 Direct	—	Acquired	(price as of 2026-08-21)
Dec. 5, 2024	RPID	P	9,120	$1.04	$9,485	54,300 Direct	+20.19%	Acquired	61.5% (price as of 2026-08-21)
Dec. 3, 2024	RPID	P	10,880	$1.00	$10,880	45,180 Direct	+31.72%	Acquired	68.0% (price as of 2026-08-21)
Nov. 27, 2024	RPID	P	19,892	$1.05	$20,887	34,300 Direct	+138.06%	Acquired	60.0% (price as of 2026-08-21)
Nov. 26, 2024	RPID	P	108	$1.04	$112	14,408 Direct	+0.76%	Acquired	61.5% (price as of 2026-08-21)
Sept. 6, 2024	BIO	A	308	—	—	308 Direct	—	Acquired	(price as of 2026-08-21)
May 23, 2024	RPID	A	14,300	—	—	14,300 Direct	—	Acquired	(price as of 2026-08-21)
May 23, 2024	RPID	A	28,650	—	—	28,650 Direct	—	Acquired	(price as of 2026-08-21)
May 4, 2023	RPID	A	25,000	—	—	25,000 Direct	—	Acquired	(price as of 2026-08-21)
May 23, 2022	RPID	A	12,500	—	—	12,500 Direct	—	Acquired	(price as of 2026-08-21)
July 14, 2021	RPID	A	25,000	—	—	25,000 Direct	—	Acquired	(price as of 2026-08-21)

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 29, 2026	RPID	Series B Warrant (right to buy)	Class A Common Stock (12,787)	$2.34	May 29, 2031	12,787	Acquired
May 29, 2026	RPID	Series A Warrant (right to buy)	Class A Common Stock (12,787)	$1.96	May 29, 2027	12,787	Acquired
May 22, 2025	RPID	Stock Option (Right to Buy)	Class A Common Stock (28,650)	$3.15	May 21, 2035	28,650	Acquired
April 22, 2025	BIO	Restricted Stock Units	Bio-Rad A Common Stock (308)	—	—	308	Disposed
April 22, 2025	BIO	Restricted Stock Units	Bio-Rad A Common Stock (407)	—	—	407	Acquired
Sept. 6, 2024	BIO	Restricted Stock Units	Bio-Rad A Common Stock (308)	—	—	308	Acquired
May 23, 2024	RPID	Stock Option (Right to Buy)	Class A Common Stock (28,650)	$0.82	May 22, 2034	28,650	Acquired
May 4, 2023	RPID	Stock Option (Right to Buy)	Class A Common Stock (25,000)	$0.87	May 3, 2033	25,000	Acquired
May 23, 2022	RPID	Stock Option (Right to Buy)	Class A Common Stock (12,500)	$4.50	May 22, 2032	12,500	Acquired
July 14, 2021	RPID	Stock Option (Right to Buy)	Class A Common Stock (25,000)	$20.00	July 13, 2031	25,000	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
May 1, 2017	BIO	No securities beneficially owned	0	Direct