Marex Group (MRX)

Marex Group on one page: short interest, daily short volume, fails to deliver, planned sales, large holders, 13F holders and insider trades. Listed on Nasdaq, classified by the SEC as security & commodity brokers, dealers, exchanges & services.

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2.4M

Short interest

settlement 2026-10-15

3.5

Days to cover

unchanged vs prior

46.3%

Short share of volume

2026-11-02

131

Fails to deliver

settlement 2026-10-13

-$5.8M

Insider flow, 90 days

0 buys, 13 sells

As of 2026-11-02.

Short interest

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

As of 15 October 2026, short interest in MRX is 2,424,442 shares, down 122,737 shares over the last month. Over the last 48 readings it ranged from 65,165 shares (29 November 2024) to 3,387,315 shares (15 July 2026). At the reported average volume of 690K shares a day that is 3.5 days to cover.

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Settlement	Shares short	Change	Avg daily volume	Days to cover
2026-10-15	2,424,442	-7.6%	689,851	3.51
2026-09-30	2,624,269	+3.0%	748,923	3.50
2026-09-15	2,547,179	-0.1%	904,161	2.82
2026-08-31	2,550,924	-12.2%	532,736	4.79
2026-08-14	2,903,567	-1.7%	722,907	4.02
2026-07-31	2,954,709	-12.8%	686,408	4.30
2026-07-15	3,387,315	+31.3%	798,949	4.24
2026-06-30	2,580,032	-15.5%	1,180,872	2.18
2026-06-15	3,053,957	+0.3%	951,311	3.21
2026-05-29	3,044,274	+22.1%	755,064	4.03
2026-05-15	2,494,377	+15.0%	1,061,314	2.35
2026-04-30	2,168,234	-24.9%	983,361	2.20
2026-04-15	2,885,989	+1.5%	1,678,139	1.72
2026-03-31	2,842,402	+7.0%	1,081,702	2.63
2026-03-13	2,657,509	+18.9%	1,023,776	2.60
2026-02-27	2,234,911	-9.3%	593,058	3.77
2026-02-13	2,464,088	+5.2%	605,912	4.07
2026-01-30	2,343,099	-5.7%	552,706	4.24
2026-01-15	2,484,561	+12.5%	519,611	4.78
2025-12-31	2,209,173	-11.7%	431,541	5.12
2025-12-15	2,501,256	+33.4%	748,693	3.34
2025-11-28	1,874,961	-34.8%	518,185	3.62
2025-11-14	2,875,545	+11.5%	651,306	4.42
2025-10-31	2,579,886	-7.3%	673,031	3.83
2025-10-15	2,782,065	-11.5%	1,259,792	2.21
2025-09-30	3,142,605	+33.9%	1,105,835	2.84
2025-09-15	2,346,862	-3.4%	917,553	2.56
2025-08-29	2,428,259	-25.1%	1,055,734	2.30
2025-08-15	3,241,073	+2.7%	1,586,012	2.04
2025-07-31	3,156,149	+45.7%	926,422	3.41
2025-07-15	2,166,424	+1.1%	1,543,813	1.40
2025-06-30	2,143,026	+138.3%	1,720,518	1.25
2025-06-13	899,344	-11.6%	750,021	1.20
2025-05-30	1,017,597	+8.5%	1,172,328	1.00
2025-05-15	937,912	-17.9%	1,113,275	1.00
2025-04-30	1,142,780	+94.3%	1,513,204	1.00
2025-04-15	588,289	+104.1%	1,072,957	1.00
2025-03-31	288,205	+84.1%	337,265	1.00
2025-03-14	156,528	-10.8%	635,935	1.00
2025-02-28	175,575	+19.7%	547,488	1.00
2025-02-14	146,720	+5.1%	265,433	1.00
2025-01-31	139,646	-37.2%	313,464	1.00
2025-01-15	222,256	-0.5%	375,647	1.00
2024-12-31	223,264	+17.0%	267,001	1.00
2024-12-13	190,797	+192.8%	354,966	1.00
2024-11-29	65,165	-39.4%	377,719	1.00
2024-11-15	107,442	-12.9%	498,356	1.00
2024-10-31	123,343	-60.0%	727,917	1.00

Daily short volume

FINRA Reg SHO, the last 30 sessions. JSON

As of 2 November 2026, the short share of MRX volume is 46.3%, down 8.3 points over the last five sessions. Over the last 30 readings it ranged from 20.3% (29 October 2026) to 60.5% (19 October 2026). The latest reading is 4.6 points above the 30-session average of 41.7%, on 248K shares reported.

Date	Short volume	Total volume	Short share	Exempt
2026-11-02	115K	248K	46.3%	0
2026-10-30	99K	355K	27.8%	0
2026-10-29	85K	420K	20.3%	2
2026-10-28	121K	414K	29.2%	49
2026-10-27	67K	156K	42.7%	0
2026-10-26	81K	148K	54.6%	0
2026-10-23	94K	188K	50.1%	0
2026-10-22	99K	192K	51.3%	0
2026-10-21	105K	272K	38.7%	2
2026-10-20	65K	139K	47.1%	0
2026-10-19	152K	250K	60.5%	164
2026-10-16	80K	209K	38.1%	0
2026-10-15	106K	221K	47.9%	0
2026-10-14	134K	302K	44.4%	2,098
2026-10-13	88K	279K	31.5%	0
2026-10-12	53K	200K	26.4%	2
2026-10-09	91K	278K	32.8%	1
2026-10-08	90K	290K	31.1%	0
2026-10-07	131K	267K	48.9%	0
2026-10-06	130K	224K	58.1%	0
2026-10-05	79K	138K	57.6%	0
2026-10-02	108K	188K	57.2%	75
2026-10-01	114K	304K	37.5%	0
2026-09-30	96K	250K	38.5%	0
2026-09-29	96K	280K	34.1%	0
2026-09-28	52K	151K	34.3%	121
2026-09-25	108K	186K	57.9%	560
2026-09-24	61K	202K	30.3%	0
2026-09-23	61K	140K	43.4%	0
2026-09-22	95K	300K	31.7%	7

Fails to deliver

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

As of 13 October 2026, the fails-to-deliver balance in MRX is 131 shares, down 107 shares over the last settlement date. Over the last 30 readings it ranged from 2 shares (13 July 2026) to 5,824 shares (3 August 2026). The latest reading sits at the bottom of that range.

Settlement	Shares failed	Price	Value
2026-10-13	131	$72.29	$9K
2026-09-23	238	$72.65	$17K
2026-09-14	380	$73.00	$28K
2026-09-10	3,293	$75.72	$249K
2026-09-01	5,000	$72.48	$362K
2026-08-31	5,000	$72.84	$364K
2026-08-28	5,000	$71.38	$357K
2026-08-05	311	$64.11	$20K
2026-08-04	560	$64.02	$36K
2026-08-03	5,824	$64.92	$378K
2026-07-24	4	$64.24	$257
2026-07-23	137	$65.85	$9K
2026-07-22	237	$64.64	$15K
2026-07-16	108	$65.07	$7K
2026-07-14	1,874	$64.88	$122K
2026-07-13	2	$65.78	$132
2026-07-10	9	$70.29	$633
2026-07-09	53	$67.18	$4K
2026-07-07	5	$66.34	$332
2026-07-06	79	$62.52	$5K
2026-07-02	5,607	$65.22	$366K
2026-07-01	5	$60.95	$305
2026-06-30	62	$58.94	$4K
2026-06-25	4,300	$64.84	$279K
2026-06-22	484	$64.85	$31K
2026-06-18	317	$61.59	$20K
2026-06-12	4,437	$63.35	$281K
2026-06-04	214	$53.90	$12K
2026-06-01	869	$52.94	$46K
2026-05-26	280	$53.20	$15K

Insider trades

SEC Form 4, newest first. JSON

Insiders at MRX reported 13 open-market sells worth $5.8M in the last 90 days and no open-market buys. Latest filing: Van Den Born Simon (President) on 2026-10-12.

Date	Insider	Title	Type	Shares	Price	Value	Owned after
2026-10-12	Van Den Born Simon	President	Sell	1K	$72.63	$92K	1.5M
2026-10-12	Van Den Born Simon	President	Sell	14K	$71.99	$1.0M	1.5M
2026-10-12	Tonucci Paolo	See Remarks	Sell	1K	$72.64	$84K	1.3M
2026-10-12	Tonucci Paolo	See Remarks	Sell	16K	$71.98	$1.1M	1.3M
2026-09-14	Tonucci Paolo	See Remarks	Sell	3K	$71.35	$211K	1.3M
2026-09-14	Tonucci Paolo	See Remarks	Sell	14K	$70.77	$971K	1.3M
2026-09-14	Van Den Born Simon	President	Sell	3K	$71.36	$189K	1.5M
2026-09-14	Van Den Born Simon	President	Sell	13K	$70.77	$893K	1.5M
2026-09-07	Tonucci Paolo	See Remarks	Tax withholding	18K	$78.27	$1.4M	1.3M
2026-09-07	Van Den Born Simon	President	Tax withholding	13K	$78.27	$1.0M	1.5M
2026-09-07	Lowitt Ian T	Chief Executive Officer	Tax withholding	37K	$78.27	$2.9M	2.8M
2026-09-07	Jethwa Nilesh	CEO, Marex Solutions	Tax withholding	32K	$78.27	$2.5M	283K
2026-08-19	Tonucci Paolo	See Remarks	Grant	39K	$0.00	$0	1.3M
2026-08-19	Van Den Born Simon	President	Grant	34K	$0.00	$0	1.5M
2026-08-19	Lowitt Ian T	Chief Executive Officer	Grant	78K	$0.00	$0	2.9M
2026-08-19	Jethwa Nilesh	CEO, Marex Solutions	Grant	67K	$0.00	$0	315K
2026-08-14	Irvin Rob	Chief Financial Officer	Sell	200	$71.86	$14K	31K
2026-08-14	Irvin Rob	Chief Financial Officer	Sell	4K	$70.91	$248K	31K
2026-08-10	Tonucci Paolo	See Remarks	Sell	455	$62.22	$28K	1.3M
2026-08-10	Tonucci Paolo	See Remarks	Sell	4K	$61.62	$244K	1.3M
2026-08-10	Tonucci Paolo	See Remarks	Sell	12K	$60.64	$743K	1.3M
2026-07-13	Tonucci Paolo	See Remarks	Sell	232	$65.73	$15K	1.3M
2026-07-13	Tonucci Paolo	See Remarks	Sell	5K	$64.85	$297K	1.3M
2026-07-13	Tonucci Paolo	See Remarks	Sell	12K	$64.22	$761K	1.3M
2026-07-13	Lowitt Ian T	Chief Executive Officer	Sell	787	$65.84	$52K	2.8M
2026-07-13	Lowitt Ian T	Chief Executive Officer	Sell	9K	$64.90	$581K	2.8M
2026-07-13	Lowitt Ian T	Chief Executive Officer	Sell	27K	$64.19	$1.8M	2.8M
2026-06-15	Tonucci Paolo	See Remarks	Sell	2K	$61.74	$102K	1.3M
2026-06-15	Tonucci Paolo	See Remarks	Sell	14K	$62.51	$888K	1.3M
2026-06-15	Tonucci Paolo	See Remarks	Sell	809	$63.00	$51K	1.3M
2026-06-12	Lowitt Ian T	Chief Executive Officer	Sell	33K	$62.29	$2.0M	2.8M
2026-06-12	Lowitt Ian T	Chief Executive Officer	Sell	4K	$62.94	$273K	2.8M
2026-06-09	Schweinitz Konstantin Graf von	Director	Grant	2K	$0.00	$0	26K
2026-06-09	Myers Linda Kristine	Director	Grant	2K	$0.00	$0	23K
2026-06-09	Pietrowicz John W.	Director	Grant	2K	$0.00	$0	24K
2026-06-09	Pickering Robert Mark	Director	Grant	2K	$0.00	$0	32K
2026-06-09	Ing Sarah	Director	Grant	2K	$0.00	$0	11K
2026-06-09	Assi Georges	Director	Grant	2K	$0.00	$0	2K
2026-06-01	Myers Linda Kristine	Director	Tax withholding	1K	$52.94	$59K	21K
2026-06-01	Pietrowicz John W.	Director	Tax withholding	558	$52.94	$30K	22K
2026-06-01	Ing Sarah	Director	Tax withholding	1K	$52.94	$69K	9K
2026-06-01	Texier Thomas	Group Head of Clearing	Sell	269	$53.98	$15K	207K
2026-06-01	Texier Thomas	Group Head of Clearing	Sell	1K	$53.22	$69K	207K
2026-05-22	Texier Thomas	Group Head of Clearing	Tax withholding	20K	$54.45	$1.1M	209K
2026-05-22	Tonucci Paolo	See Remarks	Tax withholding	31K	$54.45	$1.7M	1.3M
2026-05-22	Van Den Born Simon	President	Tax withholding	44K	$54.45	$2.4M	1.5M
2026-05-22	Lowitt Ian T	Chief Executive Officer	Tax withholding	39K	$54.45	$2.1M	2.9M
2026-05-22	Jethwa Nilesh	CEO, Marex Solutions	Tax withholding	40K	$54.45	$2.2M	247K
2026-05-22	Irvin Rob	Chief Financial Officer	Tax withholding	3K	$54.45	$183K	35K
2026-05-11	Tonucci Paolo	See Remarks	Sell	6K	$56.31	$323K	1.3M
2026-05-11	Tonucci Paolo	See Remarks	Sell	11K	$55.72	$609K	1.4M
2026-05-01	Texier Thomas	Group Head of Clearing	Sell	3K	$53.53	$139K	228K
2026-05-01	Texier Thomas	Group Head of Clearing	Sell	12K	$52.87	$625K	231K
2026-04-20	Van Den Born Simon	President	Sell	641	$51.71	$33K	1.5M
2026-04-20	Van Den Born Simon	President	Sell	13K	$50.92	$643K	1.5M
2026-04-13	Tonucci Paolo	See Remarks	Sell	4K	$52.36	$213K	1.4M
2026-04-13	Tonucci Paolo	See Remarks	Sell	6K	$51.56	$301K	1.4M
2026-04-13	Tonucci Paolo	See Remarks	Sell	7K	$50.60	$342K	1.4M
2026-04-01	Van Den Born Simon	President	Sell	5K	$43.97	$200K	1.5M
2026-04-01	Van Den Born Simon	President	Sell	9K	$43.27	$377K	1.5M
2026-04-01	Texier Thomas	Group Head of Clearing	Sell	5K	$43.97	$213K	243K
2026-04-01	Texier Thomas	Group Head of Clearing	Sell	10K	$43.28	$415K	247K

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.

Planned sales (Form 144)

Newest first. JSON

1 Form 144 notice on file for MRX worth $216K at the prices reported; 0 in the last 90 days worth $0. Latest: Sarah Ing filed on 2025-11-24 to sell 6,813 shares ($216K) from 2025-11-24.

Filed	Seller	Shares	Market value	Of outstanding	Sale from	Broker
2025-11-24	Sarah IngDirector	7K	$216K	0.009%	2025-11-24	Winterflood Business Services

Large holders (13D and 13G)

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

3 holders report 5% or more of MRX in their latest filing, all on Schedule 13G (passive). The largest reported stake is FMR LLC at 7.5% of the class (5,368,485 shares), filed 2026-08-06 for an event on 2026-06-30.

Filed	Form	Holder	Shares	Of class	Event
2026-08-14	13G	T. Rowe Price Associates, Inc.investment adviser	4.9M	6.8%	2026-06-30
2026-08-10	13G/Ano. 2	JRJ Investor 1 LPpartnership	0	0.0%	2026-06-30
2026-08-10	13G/Ano. 2	Amphitryon Limited (in liquidation)corporation	0	0.0%	2026-06-30
2026-08-10	13G/Ano. 2	JRJ Group Limitedcorporation	0	0.0%	2026-06-30
2026-08-10	13G/Ano. 2	Sir Jeremy Isaacsindividual	0	0.0%	2026-06-30
2026-08-10	13G/Ano. 2	Mr. Roger Nagioffindividual	0	0.0%	2026-06-30
2026-08-10	13G/Ano. 2	MASP Investor Limited Partnershippartnership	0	0.0%	2026-06-30
2026-08-10	13G/Ano. 2	Forty Two Point Two Acquisition Limitedcorporation	0	0.0%	2026-06-30
2026-08-10	13G/Ano. 2	BXR Group Holdings Limitedcorporation	0	0.0%	2026-06-30
2026-08-06	13G/Ano. 1	FMR LLCparent holding company	5.4M	7.5%	2026-06-30
2026-08-06	13G/Ano. 1	Abigail P. Johnsonindividual	5.4M	7.5%	2026-06-30

13F holders

Tracked managers holding MRX at their latest 13F. JSON

3 of the 30 tracked managers held MRX at their latest 13F, $94.8M in total at quarter-end prices. Two Sigma Investments is the largest at $81.4M (0.1% of its portfolio) as of 2026-06-30. Over the prior quarter 2 added shares and 1 cut.

Fund	Quarter	Shares	Value	Of portfolio	Change in shares
Two Sigma Investments	2026-06-30	1.3M	$81.4M	0.06%	-346K
Renaissance Technologies	2026-06-30	180K	$11.0M	0.02%	+100K
AQR Capital Management	2026-06-30	40K	$2.5M	0.00%	+9K

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

Marex Group 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 Marex Group (MRX), SEC CIK 1997464, listed on Nasdaq, classified by the SEC as security & commodity brokers, dealers, exchanges & services. 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 2026-10-15.JSON and CSV
Daily short volume: FINRA Reg SHO daily filesSource: FINRA.Every trading day, the morning after FINRA posts it. Latest 2026-11-02.JSON and CSV
Fails to deliver: SEC fails-to-deliver dataSource: SEC.Twice a month, a few weeks after the half month ends. Latest 2026-10-13.JSON and CSV
Planned sales: SEC EDGAR Form 144Source: SEC.New notices appear shortly after the SEC posts them; a notice is filed on or before the sale. Latest 2025-11-24.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 2026-08-14.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
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 2026-10-12.JSON and CSV
Company record: EDGAR filing index for CIK 1997464Ticker, 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 security & commodity brokers, dealers, exchanges & services

Other company pages

Datasets

Frequently Asked Questions

How much of MRX is sold short?

2,424,442 shares were held short at the 2026-10-15 settlement, 3.5 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 MRX's daily short volume?

On 2026-11-02, 114,549 of the 247,530 MRX shares reported to FINRA were sold short, 46.3% of the day's reported volume. Short volume is a flow for one day, not a position.

Does MRX have fails to deliver?

The SEC's latest file shows 131 MRX shares failed to deliver at settlement 2026-10-13. Fails are reported per settlement date and published twice a month with a lag.

Are MRX insiders buying or selling?

Insiders at MRX reported 13 open-market sells worth $5.8M in the last 90 days and no open-market buys. Latest filing: Van Den Born Simon (President) on 2026-10-12.

Have MRX insiders filed to sell?

1 Form 144 notice on file for MRX worth $216K at the prices reported; 0 in the last 90 days worth $0. Latest: Sarah Ing filed on 2025-11-24 to sell 6,813 shares ($216K) from 2025-11-24.

Who owns 5% or more of MRX?

Which tracked 13F managers own MRX?

3 of the 30 tracked 13F managers held MRX shares at their latest filing, $94.8M in all. The largest: Two Sigma Investments (1.3M shares, $81.4M), Renaissance Technologies (180K shares, $11.0M), Cliff Asness's AQR Capital Management (40K shares, $2.5M).

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