Insider Transactions Reported by 21 Insiders of MAXCYTE, INC.

Symbol: MXCT on Nasdaq
Location: Rockville, MD

Key facts

MXCT - MAXCYTE, INC. has 21 insiders with reported activity on this page.
Net insider value flow over the last year: +$449,532.
Recent transaction rows are available for direct filing-level review.

Change

Buy value: $480,175; sell value: $30,643.
Net share flow: +334,174.

Research use

This page gives a plain-language issuer insider context before you inspect transaction-level evidence.
Use the filing links below to verify timestamps, codes, and ownership impacts directly from SEC forms.

Evidence

Filed on Form 4

Issuer insider activity is sourced from SEC Forms 3, 4, and 5.

See Original Filing

Insider trading overview

Last 12 months

Net insider flow leans to buying over the last 12 months. Net value: +$449,532.

Buys

$480,175

Shares: 355,000

Insiders: 5

Sells

$30,643

Shares: 20,826

Insiders: 2

Net

+$449,532

Shares: +334,174

Insiders: 3

Window (months)	Buy shares	Sell shares	Buy $	Sell $	Net $
0-3	0	10,142	$0	$8,266	-$8,266
3-6	0	0	$0	$0	$0
6-9	0	0	$0	$0	$0
9-12	355,000	10,684	$480,175	$22,378	+$457,797

MAXCYTE, INC. executives and other stock owners filed with the SEC include:

Name	Relationship	Holdings Value	Past Year Net Change	Change %	Valuation	Report Date
Casdin Partners Master Fund, L.P.	10%+ Owner	$45,300,000			Mixed	03 Oct 2022
Art Mandell	Director	$1,940,066			Mixed	11 Jun 2024
Douglas Doerfler	President and CEO, Director	$1,509,382			Mixed	04 Dec 2023
Maher Masoud	President and CEO, Director	$736,250	+$102,915	+16%	Mixed	27 Mar 2026
Stanley C. Erck	Director	$546,585	+$137,220	+34%	Filing P/S	13 Aug 2025
J. Stark Thompson PhD	Director	$502,459			Mixed	09 Aug 2021
John Joseph Johnston	Director	$407,360			Mixed	18 Jun 2025
DOUGLAS RICHARD	Director	$320,040	+$111,040	+53%	Filing P/S	13 Aug 2025
David I. Sandoval	General Counsel	$204,171			Filing P/S	18 Mar 2025
William W. Brooke	Director	$194,633	+$64,500	+50%	Filing P/S	13 Aug 2025
Cynthia Collins	Director	$192,515			Mixed	18 Jun 2025
Ali Soleymannezhad	Chief Commercial Officer	$188,974			Filing P/S	18 Mar 2025
Parmeet Ahuja	Chief Financial Officer	$131,812			Median	15 Apr 2026
Douglas J. Swirsky	Chief Financial Officer	$123,610	+$56,234	+83%	Filing P/S	17 Mar 2026
Patrick J. Balthrop	Director	$120,373			Mixed	18 Jun 2025
B. al Wakeel	Director	$120,373			Mixed	18 Jun 2025
Thomas M. Ross	Evp, Global Sales	$109,025			Filing P/S	01 Aug 2024
Rekha Hemrajani	Director	$83,555	-$22,378	-21%	Filing P/S	25 Jun 2025
Cenk Sumen	Chief Scientific Officer				Mixed	11 Apr 2022
Amanda Louise Murphy	Chief Financial Officer				Mixed	25 Mar 2022
Ron Holtz	Chief Financial Officer				Mixed	20 Mar 2023

Top shareholders of MAXCYTE, INC. (13F + 13D/G + 3/4/5)

Grouped by holder across the latest SEC ownership disclosures. Ownership % is shown only when it is directly reported or safely comparable across share classes.

Methodology: rows are grouped by holder and ranked first by SEC-reported ownership % when it is safely comparable, then by disclosed holdings value. — indicates unavailable or non-comparable values; "mixed-class rows" means the latest filing spans non-comparable classes.

Holder	Source	Role / Reporting	Ownership %	Shares	Holdings Value	12M Net Δ	As of	Details
Capricorn Fund Managers Ltd	13D/G 13F	Company	7.7%	8,200,000	$12,710,000	$0	30 Jan 2026	13D/G 13F
BlackRock, Inc.	13D/G 13F	Company	6.6%	6,997,197	$10,845,655	-$1,951,145	31 Dec 2025	13D/G 13F
RIVER GLOBAL INVESTORS LLP	13D/G	—	5.2%	5,497,452	$8,685,974	$0	23 Sep 2025	13D/G
CADIAN CAPITAL MANAGEMENT, LP	13D/G 13F	Company	3.5%	3,683,052	$5,708,731	-$7,044,054	31 Dec 2025	13D/G 13F
Douglas J. Swirsky	3/4/5	CHIEF FINANCIAL OFFICER	0.14%	151,669	$123,610	+$56,234	17 Mar 2026	3/4/5
Vitruvian Partners LLP	13F	Company	4.8%	5,043,356	$3,542,958	—	31 Mar 2026	13F
VANGUARD CAPITAL MANAGEMENT LLC	13F	Company	3.8%	3,981,816	$2,799,217	—	31 Mar 2026	13F
MORGAN STANLEY	13F	Company	3.5%	3,688,131	$2,590,912	—	31 Mar 2026	13F
Mudita Advisors LLP	13F	Company	3.2%	3,370,689	$2,367,909	—	31 Mar 2026	13F
BNP Paribas Asset Management Holding S.A.	13F	Company	2.6%	2,773,554	$1,948,422	—	31 Mar 2026	13F
GEODE CAPITAL MANAGEMENT, LLC	13F	Company	2.2%	2,362,672	$1,660,185	—	31 Mar 2026	13F
STATE STREET CORP	13F	Company	2.1%	2,193,470	$1,540,913	—	31 Mar 2026	13F
Brooklands Fund Management Ltd	13F	Company	2.1%	2,190,020	$1,538,489	—	31 Mar 2026	13F
RENAISSANCE TECHNOLOGIES LLC	13F	Company	1.9%	1,993,200	$1,400,223	—	31 Mar 2026	13F
Peapod Lane Capital LLC	13F	Company	1.3%	1,332,193	$925,817	—	31 Mar 2026	13F
AQR CAPITAL MANAGEMENT LLC	13F	Company	1.2%	1,221,182	$857,881	—	31 Mar 2026	13F
GOLDMAN SACHS GROUP INC	13F	Company	1.1%	1,159,019	$814,211	—	31 Mar 2026	13F
LUMINUS MANAGEMENT LLC	13F	Company	1.1%	1,150,000	$807,875	—	31 Mar 2026	13F
Stonepine Capital Management, LLC	13F	Company	0.95%	1,004,673	$705,783	—	31 Mar 2026	13F
NANO CAP NEW MILLENNIUM GROWTH FUND L P	13F	Company	0.95%	1,000,000	$702,500	—	31 Mar 2026	13F
VANGUARD PORTFOLIO MANAGEMENT LLC	13F	Company	0.85%	889,240	$625,136	—	31 Mar 2026	13F
Willis Investment Counsel	13F	Company	0.82%	862,758	$606,087	—	31 Mar 2026	13F
NORTHERN TRUST CORP	13F	Company	0.76%	799,709	$561,796	—	31 Mar 2026	13F
JACOBS LEVY EQUITY MANAGEMENT, INC	13F	Company	0.74%	776,224	$545,297	—	31 Mar 2026	13F
VANGUARD FIDUCIARY TRUST CO	13F	Company	0.61%	643,206	$452,174	—	31 Mar 2026	13F
TWO SIGMA INVESTMENTS, LP	13F	Company	0.58%	608,162	$427,234	—	31 Mar 2026	13F
DIMENSIONAL FUND ADVISORS LP	13F	Company	0.48%	502,646	$352,888	—	31 Mar 2026	13F
GEORGE KAISER FAMILY FOUNDATION	13F	Individual	0.46%	481,803	$338,467	—	31 Mar 2026	13F
Bank of New York Mellon Corp	13F	Company	0.38%	403,937	$283,766	—	31 Mar 2026	13F
FRED ALGER MANAGEMENT, LLC	13F	Company	0.37%	386,667	$271,634	—	31 Mar 2026	13F
CITADEL ADVISORS LLC	13F	Company	0.32%	333,088	$233,994	—	31 Mar 2026	13F
CHARLES SCHWAB INVESTMENT MANAGEMENT INC	13F	Company	0.31%	328,651	$230,877	—	31 Mar 2026	13F
Apollo Management Holdings, L.P.	13F	Company	0.29%	307,987	$216,361	—	31 Mar 2026	13F
Mink Brook Asset Management LLC	13F	Company	0.27%	284,024	$199,527	—	31 Mar 2026	13F
UBS Group AG	13F	Company	0.26%	271,054	$190,551	—	31 Mar 2026	13F
VOYA INVESTMENT MANAGEMENT LLC	13F	Company	0.24%	256,120	$179,924	—	31 Mar 2026	13F
HSBC HOLDINGS PLC	13F	Company	0.24%	250,172	$172,343	—	31 Mar 2026	13F
Rathbones Group PLC	13F	Company	0.21%	223,378	$156,923	—	31 Mar 2026	13F
Nuveen, LLC	13F	Company	0.21%	218,497	$153,494	—	31 Mar 2026	13F
D. E. Shaw & Co., Inc.	13F	Company	0.19%	200,505	$140,855	—	31 Mar 2026	13F
FMR LLC	13F	Company	0.18%	190,126	$133,564	—	31 Mar 2026	13F
BARCLAYS PLC	13F	Company	0.15%	163,062	$114,553	—	31 Mar 2026	13F
AMERIPRISE FINANCIAL INC	13F	Company	0.14%	144,087	$101,221	—	31 Mar 2026	13F
STRS OHIO	13F	Company	0.12%	129,500	$90,974	—	31 Mar 2026	13F
BANK OF AMERICA CORP /DE/	13F	Company	0.12%	127,258	$89,335	—	31 Mar 2026	13F
RHUMBLINE ADVISERS	13F	Company	0.12%	122,294	$85,842	—	31 Mar 2026	13F
Invesco Ltd.	13F	Company	0.11%	119,227	$83,758	—	31 Mar 2026	13F
IEQ CAPITAL, LLC	13F	Company	0.11%	115,200	$80,928	—	31 Mar 2026	13F
Callan Family Office, LLC	13F	Company	0.11%	112,989	$79,375	—	31 Mar 2026	13F
ALLIANCEBERNSTEIN L.P.	13F	Company	0.1%	100,100	$155,155	—	31 Mar 2026	13F

Recent Insider Transactions by Companies or Individuals for MAXCYTE, INC.

Showing up to 300 most recent insider transactions from the last 12 months.

Insider	Symbol	Class	Transaction	%	Value $	* Price $	Shares	Shares Owned	Date	Ownership
Parmeet Ahuja	MXCT	Common Stock	Award				187,500	187,500	15 Apr 2026	Direct
Parmeet Ahuja	MXCT	Employee Stock Option (right to buy)	Award				375,000	375,000	30 Mar 2026	Direct
Maher Masoud	MXCT	Common Stock	Award	171.4%			300,000	475,000	27 Mar 2026	Direct
Maher Masoud	MXCT	Employee Stock Option (right to buy)	Award				600,000	600,000	27 Mar 2026	Direct
Douglas J. Swirsky	MXCT	Common Stock	Sale	-6.27%	$8,266	$0.8150	-10,142	151,669	17 Mar 2026	Direct
Douglas J. Swirsky	MXCT	Common Stock	Purchase	44.7%	$64,500	$1.29	50,000	161,811	13 Aug 2025	Direct
Maher Masoud	MXCT	Common Stock	Purchase	75%	$102,915	$1.37	75,000	175,000	13 Aug 2025	Direct
Stanley C. Erck	MXCT	Common Stock	Purchase	33.5%	$137,220	$1.37	100,000	398,328	13 Aug 2025	Direct
Douglas Richard	MXCT	Common Stock	Purchase	53.1%	$111,040	$1.39	80,000	230,577	13 Aug 2025	Direct
William W. Brooke	MXCT	Common Stock	Purchase	49.6%	$64,500	$1.29	50,000	150,879	13 Aug 2025	Direct
Rekha Hemrajani	MXCT	Common Stock	Sale	-21.1%	$22,378	$2.09	-10,684	39,893	25 Jun 2025	Direct
John Joseph Johnston	MXCT	Common Stock	Award	20.6%			29,210	171,160	18 Jun 2025	Direct
John Joseph Johnston	MXCT	Stock Option (right to buy)	Award				50,790	50,790	18 Jun 2025	Direct
Rekha Hemrajani	MXCT	Common Stock	Award	136.7%			29,210	50,577	18 Jun 2025	Direct
Rekha Hemrajani	MXCT	Stock Option (right to buy)	Award				50,790	50,790	18 Jun 2025	Direct
Stanley C. Erck	MXCT	Common Stock	Award	10.8%			29,210	298,328	18 Jun 2025	Direct
Stanley C. Erck	MXCT	Stock Option (right to buy)	Award				50,790	50,790	18 Jun 2025	Direct
Douglas Richard	MXCT	Common Stock	Award	24.1%			29,210	150,577	18 Jun 2025	Direct
Douglas Richard	MXCT	Stock Option (right to buy)	Award				50,790	50,790	18 Jun 2025	Direct
Cynthia Collins	MXCT	Common Stock	Award	56.5%			29,210	80,889	18 Jun 2025	Direct
Cynthia Collins	MXCT	Stock Option (right to buy)	Award				50,790	50,790	18 Jun 2025	Direct
William W. Brooke	MXCT	Common Stock	Award	40.8%			29,210	100,879	18 Jun 2025	Direct
William W. Brooke	MXCT	Stock Option (right to buy)	Award				50,790	50,790	18 Jun 2025	Direct
Patrick J. Balthrop	MXCT	Common Stock	Award	136.7%			29,210	50,577	18 Jun 2025	Direct
Patrick J. Balthrop	MXCT	Stock Option (right to buy)	Award				50,790	50,790	18 Jun 2025	Direct
B. al Wakeel	MXCT	Common Stock	Award	136.7%			29,210	50,577	18 Jun 2025	Direct
B. al Wakeel	MXCT	Stock Option (right to buy)	Award				50,790	50,790	18 Jun 2025	Direct

* An asterisk sign (*) next to the price indicates that the price is likely invalid.