Maxcyte (MXCT)

Maxcyte on one page: short interest, daily short volume, fails to deliver, large holders, 13F holders, earnings dates and insider trades. Listed on Nasdaq, classified by the SEC as services-commercial physical & biological research.

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1.1M

Short interest

settlement 2026-09-30

3.1

Days to cover

+0.3 days vs prior

55.2%

Short share of volume

2026-10-09

3,248

Fails to deliver

settlement 2026-09-09

Wed 4 Nov

Next earnings

estimated date

Insider flow, 90 days

0 buys, 0 sells

As of 2026-10-09.

Short interest

FINRA, twice a month. The newest 24 settlements in the table, 48 in the chart. JSON

As of 30 September 2026, short interest in MXCT is 1,089,972 shares, down 211,741 shares over the last month. Over the last 48 readings it ranged from 1,089,972 shares (30 September 2026) to 5,754,015 shares (27 February 2026). The latest reading sits at the bottom of that range. At the reported average volume of 347K shares a day that is 3.1 days to cover.

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Settlement	Shares short	Change	Avg daily volume	Days to cover
2026-09-30	1,089,972	-6.9%	346,888	3.14
2026-09-15	1,170,407	-10.1%	417,192	2.81
2026-08-31	1,301,713	+6.2%	548,574	2.37
2026-08-14	1,225,669	-1.4%	1,087,660	1.13
2026-07-31	1,242,618	-11.7%	784,404	1.58
2026-07-15	1,406,444	-7.2%	1,151,692	1.22
2026-06-30	1,515,592	-64.3%	2,364,915	1.00
2026-06-15	4,239,514	-5.2%	734,485	5.77
2026-05-29	4,469,961	-5.4%	1,176,759	3.80
2026-05-15	4,724,376	-9.9%	1,254,248	3.77
2026-04-30	5,243,689	-3.1%	643,375	8.15
2026-04-15	5,413,302	-2.5%	846,906	6.39
2026-03-31	5,552,543	+1.1%	963,642	5.76
2026-03-13	5,490,241	-4.6%	1,096,731	5.01
2026-02-27	5,754,015	+13.0%	1,107,548	5.20
2026-02-13	5,092,073	+31.2%	1,727,932	2.95
2026-01-30	3,881,689	+55.1%	1,116,399	3.48
2026-01-15	2,503,062	+5.3%	620,448	4.03
2025-12-31	2,377,401	-11.4%	590,017	4.03
2025-12-15	2,683,916	-4.9%	1,919,438	1.40
2025-11-28	2,821,323	-6.4%	1,063,103	2.65
2025-11-14	3,014,662	-0.4%	794,651	3.79
2025-10-31	3,025,611	-11.9%	493,322	6.13
2025-10-15	3,434,451	+6.1%	661,989	5.19

Daily short volume

FINRA Reg SHO, the last 30 sessions. JSON

As of 9 October 2026, the short share of MXCT volume is 55.2%, up 26.9 points over the last five sessions. Over the last 30 readings it ranged from 12.0% (1 September 2026) to 71.3% (8 October 2026). The latest reading is 25.0 points above the 30-session average of 30.1%, on 109K shares reported.

Date	Short volume	Total volume	Short share	Exempt
2026-10-09	60K	109K	55.2%	13
2026-10-08	144K	202K	71.3%	2,336
2026-10-07	33K	108K	30.4%	2,000
2026-10-06	89K	153K	58.4%	0
2026-10-05	29K	75K	37.9%	0
2026-10-02	32K	112K	28.2%	0
2026-10-01	94K	178K	52.7%	200
2026-09-30	29K	152K	19.1%	0
2026-09-29	49K	150K	32.6%	0
2026-09-28	20K	148K	13.3%	0
2026-09-25	22K	100K	22.4%	0
2026-09-24	21K	87K	24.1%	0
2026-09-23	17K	67K	25.4%	0
2026-09-22	21K	93K	23.0%	0
2026-09-21	112K	231K	48.6%	2,500
2026-09-18	21K	76K	28.0%	0
2026-09-17	24K	81K	29.7%	0
2026-09-16	49K	97K	50.6%	0
2026-09-15	30K	116K	25.5%	0
2026-09-14	71K	295K	24.0%	0
2026-09-11	34K	154K	21.8%	5,100
2026-09-10	49K	144K	34.3%	0
2026-09-09	34K	217K	15.4%	0
2026-09-08	36K	174K	20.6%	0
2026-09-04	24K	176K	13.7%	0
2026-09-03	38K	226K	16.9%	0
2026-09-02	51K	242K	21.1%	7,496
2026-09-01	38K	315K	12.0%	0
2026-08-31	59K	237K	24.9%	0
2026-08-28	55K	239K	23.2%	0

Fails to deliver

SEC, the last 30 settlement dates with a fail. JSON

As of 9 September 2026, the fails-to-deliver balance in MXCT is 3,248 shares, down 3,325 shares over the last settlement date. Over the last 30 readings it ranged from 1 share (27 May 2026) to 12,848 shares (9 June 2026).

Settlement	Shares failed	Price	Value
2026-09-09	3,248	$1.28	$4K
2026-09-08	6,573	$1.28	$8K
2026-09-02	4,229	$1.24	$5K
2026-08-31	1,100	$1.22	$1K
2026-08-28	1,100	$1.28	$1K
2026-08-21	5,085	$1.38	$7K
2026-08-12	1,092	$1.24	$1K
2026-08-11	2,325	$1.21	$3K
2026-08-07	12,115	$1.11	$13K
2026-08-05	3,764	$1.11	$4K
2026-07-17	750	$1.35	$1K
2026-07-10	1,120	$1.28	$1K
2026-06-30	11,141	$1.24	$14K
2026-06-29	11,987	$1.24	$15K
2026-06-26	10,500	$1.27	$13K
2026-06-22	5,217	$1.21	$6K
2026-06-15	365	$1.12	$409
2026-06-11	5,029	$1.15	$6K
2026-06-10	5,029	$1.19	$6K
2026-06-09	12,848	$1.15	$15K
2026-06-08	9,127	$1.14	$10K
2026-06-04	1,732	$1.20	$2K
2026-05-27	1	$1.00	$1
2026-05-26	3,936	$1.04	$4K
2026-05-19	139	$1.06	$147
2026-05-14	296	$1.02	$302
2026-05-13	6,088	$0.82	$5K
2026-05-12	6,922	$0.82	$6K
2026-05-11	2,944	$0.84	$2K
2026-05-07	9,886	$0.85	$8K

Insider trades

SEC Form 4, newest first, 50 of 100 shown. JSON

No open-market insider trades were reported for MXCT in the last 90 days. The most recent filings are listed below. Latest filing: Brooke William W (Director) on 2026-06-17.

Date	Insider	Title	Type	Shares	Price	Value	Owned after
2026-06-17	Brooke William W	Director	Grant	30K	$0.00	$0	181K
2026-06-17	Collins Cynthia	Director	Grant	30K	$0.00	$0	111K
2026-06-17	DOUGLAS RICHARD	Director	Grant	30K	$0.00	$0	261K
2026-06-17	Erck Stanley C	Director	Grant	30K	$0.00	$0	429K
2026-06-17	Hemrajani Rekha	Director	Grant	30K	$0.00	$0	70K
2026-06-17	Johnston John Joseph	Director	Grant	30K	$0.00	$0	202K
2026-06-17	BALTHROP PATRICK J	Director	Grant	30K	$0.00	$0	81K
2026-06-17	Al-Wakeel Yasir B.	Director	Grant	30K	$0.00	$0	81K
2026-04-15	Ahuja Parmeet	Chief Financial Officer	Grant	188K	$0.00	$0	188K
2026-03-27	Masoud Maher	President and CEO	Grant	300K	$0.00	$0	475K
2026-03-17	Swirsky Douglas J	CHIEF FINANCIAL OFFICER	Sell	10K	$0.81	$8K	152K
2025-08-13	Swirsky Douglas J	CHIEF FINANCIAL OFFICER	Buy	50K	$1.29	$65K	162K
2025-08-13	Masoud Maher	President and CEO	Buy	75K	$1.37	$103K	175K
2025-08-13	Erck Stanley C	Director	Buy	100K	$1.37	$137K	398K
2025-08-13	DOUGLAS RICHARD	Director	Buy	80K	$1.39	$111K	231K
2025-08-13	Brooke William W	Director	Buy	50K	$1.29	$65K	151K
2025-06-25	Hemrajani Rekha	Director	Sell	11K	$2.09	$22K	40K
2025-06-18	Johnston John Joseph	Director	Grant	29K	$0.00	$0	171K
2025-06-18	Hemrajani Rekha	Director	Grant	29K	$0.00	$0	51K
2025-06-18	Erck Stanley C	Director	Grant	29K	$0.00	$0	298K
2025-06-18	DOUGLAS RICHARD	Director	Grant	29K	$0.00	$0	151K
2025-06-18	Collins Cynthia	Director	Grant	29K	$0.00	$0	81K
2025-06-18	Brooke William W	Director	Grant	29K	$0.00	$0	101K
2025-06-18	BALTHROP PATRICK J	Director	Grant	29K	$0.00	$0	51K
2025-06-18	Al-Wakeel Yasir B.	Director	Grant	29K	$0.00	$0	51K
2025-03-18	Swirsky Douglas J	CHIEF FINANCIAL OFFICER	Sell	7K	$3.18	$22K	112K
2025-03-18	Sandoval David I.	GENERAL COUNSEL	Sell	353	$3.18	$1K	64K
2025-03-18	Soleymannezhad Ali	Chief Commercial Officer	Sell	1K	$3.18	$4K	59K
2025-03-14	Swirsky Douglas J	CHIEF FINANCIAL OFFICER	Grant	38K	$0.00	$0	119K
2025-03-14	Sandoval David I.	GENERAL COUNSEL	Grant	23K	$0.00	$0	65K
2025-03-14	Soleymannezhad Ali	Chief Commercial Officer	Grant	35K	$0.00	$0	61K
2025-01-27	Johnston John Joseph	Director	Option exercise	3K	$2.93	$9K	145K
2025-01-27	Johnston John Joseph	Director	Sell	3K	$4.65	$14K	142K
2025-01-13	Sandoval David I.	GENERAL COUNSEL	Sell	4K	$4.54	$20K	41K
2024-12-26	Johnston John Joseph	Director	Sell	3K	$4.01	$12K	142K
2024-12-26	Johnston John Joseph	Director	Option exercise	3K	$2.93	$9K	145K
2024-12-09	Johnston John Joseph	Director	Option exercise	891	$2.93	$3K	143K
2024-12-09	Johnston John Joseph	Director	Option exercise	1K	$1.64	$2K	144K
2024-12-09	Johnston John Joseph	Director	Option exercise	483	$2.93	$1K	144K
2024-12-09	Johnston John Joseph	Director	Sell	2K	$3.79	$9K	142K
2024-12-06	Johnston John Joseph	Director	Sell	505	$3.70	$2K	142K
2024-12-06	Johnston John Joseph	Director	Option exercise	505	$2.93	$1K	142K
2024-11-01	Erck Stanley C	Director	Sell	48K	$3.72	$177K	269K
2024-11-01	Erck Stanley C	Director	Option exercise	48K	$0.04	$2K	317K
2024-10-28	Johnston John Joseph	Director	Option exercise	3K	$2.93	$9K	145K
2024-10-28	Johnston John Joseph	Director	Sell	3K	$3.72	$11K	142K
2024-10-14	Collins Cynthia	Director	Grant	52K	$0.00	$0	52K
2024-10-02	Erck Stanley C	Director	Sell	22K	$3.71	$80K	269K
2024-10-02	Erck Stanley C	Director	Option exercise	22K	$0.04	$864	291K
2024-10-01	Erck Stanley C	Director	Option exercise	26K	$0.04	$1K	295K

Form 4 filings are due within two business days of the trade. Insiders sell for many reasons that say nothing about the company; open-market buys are rarer.

Large holders (13D and 13G)

One row per reporting person with its latest filing, newest first. JSON

1 holder reports 5% or more of MXCT in its latest filing, on Schedule 13G (passive). The holder is Capricorn Fund Managers Ltd at 7.7% of the class (8,200,000 shares), filed 2026-02-05 for an event on 2026-01-30.

Filed	Form	Holder	Shares	Of class	Event
2026-08-04	13D	RIVER GLOBAL INVESTORS LLPinvestment company	834K	0.8%	2026-07-31
2026-07-29	13G/Ano. 5	BlackRock, Inc.parent holding company	1.4M	1.3%	2026-06-30
2026-04-10	13G/Ano. 2	Mirabella Financial Services LLPinvestment adviser	0	0.0%	2026-03-31
2026-03-27	13G/Ano. 1	The Vanguard Groupinvestment adviser	0	0.0%	2026-03-13
2026-02-17	13G/Ano. 4	Cadian Capital Management, LPinvestment adviser, partnership	3.7M	3.5%	2025-12-31
2026-02-17	13G/Ano. 4	Cadian Capital Management GP, LLCother entity, parent holding company	3.7M	3.5%	2025-12-31
2026-02-17	13G/Ano. 4	ERIC BANNASCHindividual, parent holding company	3.7M	3.5%	2025-12-31
2026-02-05	13G	Capricorn Fund Managers Ltdinvestment adviser	8.2M	7.7%	2026-01-30

13F holders

Tracked managers holding MXCT at their latest 13F. JSON

6 of the 30 tracked managers held MXCT at their latest 13F, $9.4M in total at quarter-end prices. Renaissance Technologies is the largest at $2.4M (0.0% of its portfolio) as of 2026-06-30. Over the prior quarter 5 added shares and 1 cut.

Fund	Quarter	Shares	Value	Of portfolio	Change in shares
Renaissance Technologies	2026-06-30	1.9M	$2.4M	0.00%	-82K
AQR Capital Management	2026-06-30	1.9M	$2.3M	0.00%	+662K
Two Sigma Investments	2026-06-30	1.5M	$1.8M	0.00%	+855K
Millennium Management	2026-06-30	1.2M	$1.5M	0.00%	+1.2M
Citadel Advisors	2026-06-30	856K	$1.1M	0.00%	+523K
Point72 Asset Management	2026-06-30	300K	$369K	0.00%	new

Only the 30 tracked managers on the funds hub; a 13F reports long positions in US listed stock at quarter end, 45 days late, and says nothing about shorts or positions sold since.

What this page is

Maxcyte in the regulatory record

Regulators publish company data in separate files that never sit next to each other: FINRA's twice-monthly short interest, its daily short sale volume, the SEC's fails-to-deliver counts, and each insider's Form 4. A company page puts those series for one ticker on one URL, with planned sales, large holders, 13F holders and financials beside them, so the short position, the daily flow, the settlement fails and what insiders are doing can be read together.

Each section has its own history table, a one-line summary of the latest figures and its own JSON and CSV links, and says when its source last updated.

This page follows Maxcyte (MXCT), SEC CIK 1287098, listed on Nasdaq, classified by the SEC as services-commercial physical & biological research. The cross-market tables live on the short interest and insider transactions hubs.

Source and updates

Short interest: FINRA consolidated short interestSource: FINRA.Twice a month, about eight business days after settlement. Latest 2026-09-30.JSON and CSV
Daily short volume: FINRA Reg SHO daily filesSource: FINRA.Every trading day, the morning after FINRA posts it. Latest 2026-10-09.JSON and CSV
Fails to deliver: SEC fails-to-deliver dataSource: SEC.Twice a month, a few weeks after the half month ends. Latest 2026-09-09.JSON and CSV
Large holders: SEC EDGAR Schedule 13D and 13GSource: SEC.New filings appear shortly after the SEC posts them. A 13D is due within five business days of crossing 5%; a 13G follows the passive schedule. Latest 2026-08-04.JSON and CSV
13F holders: SEC EDGAR Form 13F-HRSource: SEC.Quarterly, filed within 45 days of quarter end; 30 tracked managers. Latest 2026-06-30.JSON and CSV
Earnings dates: SEC EDGAR 8-K filings (Item 2.02)Source: SEC.Twice a day. Reported dates come from the company's 8-K filings; the next date is marked as an estimate until the 8-K arrives. Latest 2026-08-12.JSON and CSV
Insider trades: SEC EDGAR Form 4Source: SEC.New filings appear shortly after the SEC posts them; they're due two business days after the trade. Latest 2026-06-17.JSON and CSV
Company record: EDGAR filing index for CIK 1287098Ticker, name and exchange from the SEC's company list, refreshed weekly.
Rate limits: 10 requests a minute without a key, 30 with a free key from a free account.

How to read it

Read the position against the flow: rising short interest with a high daily short share is new shorting; rising short interest with a normal short share is old shorts holding on.
Insider buys next to a large short position are rare and stand out; insider sells next to one are common and mean little.
Fails to deliver matter relative to the float, not in absolute shares; a million failed shares in a mega cap is noise.

Analysis of what the data shows, not advice. XOOMAR does not recommend buying, selling or holding anything.

Other companies the SEC classifies as services-commercial physical & biological research

Other company pages

Datasets

Frequently Asked Questions

How much of MXCT is sold short?

1,089,972 shares were held short at the 2026-09-30 settlement, 3.1 days of average volume. FINRA publishes the next count about eight business days after the 15th and the last business day of the month.

What is MXCT's daily short volume?

On 2026-10-09, 60,152 of the 109,050 MXCT shares reported to FINRA were sold short, 55.2% of the day's reported volume. Short volume is a flow for one day, not a position.

Does MXCT have fails to deliver?

The SEC's latest file shows 3,248 MXCT shares failed to deliver at settlement 2026-09-09. Fails are reported per settlement date and published twice a month with a lag.

Are MXCT insiders buying or selling?

No open-market insider trades were reported for MXCT in the last 90 days. The most recent filings are listed below. Latest filing: Brooke William W (Director) on 2026-06-17.

Who owns 5% or more of MXCT?

Which tracked 13F managers own MXCT?

6 of the 30 tracked 13F managers held MXCT shares at their latest filing, $9.4M in all. The largest: Renaissance Technologies (1.9M shares, $2.4M), Cliff Asness's AQR Capital Management (1.9M shares, $2.3M), Two Sigma Investments (1.5M shares, $1.8M), Izzy Englander's Millennium Management (1.2M shares, $1.5M), Ken Griffin's Citadel Advisors (856K shares, $1.1M), Steve Cohen's Point72 Asset Management (300K shares, $369K).

Data on this page is provided for informational purposes only and is not financial advice. See our editorial policy.