MRX in the 13F filings

Marex Group PLC · CUSIP G5S37H101

Sector · Other financial services Theme · Financial services· L3VLUP-defined

Quarter

Q2 2026 Q1 2026 Q4 2025 Q3 2025 Q2 2025 Q1 2025 Q4 2024

Quarter end: 31 Dec 2025; the date the book describes
Filed: 27 Oct 2026; latest of these filings; the earliest 10 Feb 2026
Managers listing it: 22; at least, of 95 tracked, among listed positions
Comparable managers: 92; filed both Q3 2025 and Q4 2025; 5 listed it in both
Shares listed: 11,650,648; combined, among listed positions
Reported value: $447m; combined, at the quarter end

Among the 92 comparable managers: 12 buyers (opened or added shares) and 16 sellers (trimmed or exited), at least, among listed positions. Their net change in shares was -1,109,038.

Managers listing MRX in Q4 2025

Share of 13F value is the position’s reported value over everything the manager reported that quarter. The share change is against Q3 2025, and only where both filings list the position. A rise in value with no rise in shares is the price, not buying.

ActionShare of book at least

22 of 22 holders

				Action		Filing
AllianceBernstein LP	1,750,252	$67m	under 0.1%	Added	+191,326	17 Feb 2026 (the filing on sec.gov)
T. Rowe Price Associates Inc	1,548,637	$59m	under 0.1%	Added	+337,444	17 Feb 2026 (the filing on sec.gov)
Balyasny Asset Management LLC	1,396,390	$54m	0.07%	Added	+194,802	17 Feb 2026 (the filing on sec.gov)
Fidelity (FMR LLC)	1,334,798	$51m	under 0.1%	Added	+578,412	17 Feb 2026 (the filing on sec.gov)
Invesco Ltd	1,294,978	$50m	under 0.1%	Added	+82,261	19 Feb 2026 (the filing on sec.gov)
Artisan Partners LP	904,957	$35m	0.05%	Added	+367,954	17 Feb 2026 (the filing on sec.gov)
Two Sigma Investments LP	903,123	$35m	under 0.1%	Trimmed	-31,098	17 Feb 2026 (the filing on sec.gov)
Wellington Management Group LLP	759,836	$29m	under 0.1%	Added	+301,763	17 Feb 2026 (the filing on sec.gov)
Two Sigma Advisers LP	679,600	$26m	0.05%	Trimmed	-124,300	17 Feb 2026 (the filing on sec.gov)
Voloridge Investment Management LLC	422,471	$16m	0.06%	Trimmed	-251,767	17 Feb 2026 (the filing on sec.gov)
Renaissance Technologies LLC	220,787	$8.5m	under 0.1%	Trimmed	-294,100	12 Feb 2026 (the filing on sec.gov)
Marshall Wace LLP	114,417	$4.4m	under 0.1%	Trimmed	-542,163	13 Feb 2026 (the filing on sec.gov)
Citadel Advisors LLC	90,059	$3.5m	under 0.1%	Trimmed	-438,023	17 Feb 2026 (the filing on sec.gov)
Millennium Management LLC	82,779	$3.2m	under 0.1%	Trimmed	-252,827	17 Feb 2026 (the filing on sec.gov)
Quantbot Technologies LP	36,535	$1.4m	under 0.1%	Added	+10,521	10 Feb 2026 (the filing on sec.gov)
AQR Capital Management LLC	25,221	$967k	under 0.1%	Added	+16,813	17 Feb 2026 (the filing on sec.gov)
Neuberger Berman Group LLC	22,460	$862k	under 0.1%	New	new	27 Oct 2026 (the filing on sec.gov)
Verition Fund Management LLC	18,000	$690k	under 0.1%	Added	+900	13 Feb 2026 (the filing on sec.gov)
Jane Street Group LLC	12,787	$491k	under 0.1%	Trimmed	-47,934	12 Feb 2026 (the filing on sec.gov)
D. E. Shaw & Co.	12,068	$463k	under 0.1%	New	new	17 Feb 2026 (the filing on sec.gov)
Walleye Capital LLC	10,876	$417k	under 0.1%	Trimmed	-85,618	13 Feb 2026 (the filing on sec.gov)
Squarepoint Ops LLC	9,617	$369k	under 0.1%	Trimmed	-193,234	13 Feb 2026 (the filing on sec.gov)

Largest increases and reductions, by shares

Q3 2025 to Q4 2025, among managers that listed it in both quarters or opened it.

Increases

Fidelity (FMR LLC)existing position · 1,334,798 shares now+578,412
Artisan Partners LPexisting position · 904,957 shares now+367,954
T. Rowe Price Associates Incexisting position · 1,548,637 shares now+337,444
Wellington Management Group LLPexisting position · 759,836 shares now+301,763
Balyasny Asset Management LLCexisting position · 1,396,390 shares now+194,802

Reductions

Marshall Wace LLPexisting position · 114,417 shares now-542,163
Citadel Advisors LLCexisting position · 90,059 shares now-438,023
Renaissance Technologies LLCexisting position · 220,787 shares now-294,100
Millennium Management LLCexisting position · 82,779 shares now-252,827
Voloridge Investment Management LLCexisting position · 422,471 shares now-251,767

New positions and exits

At least these many: a manager is shown exiting only where its own filing shows the position gone.

New (2)

Neuberger Berman Group LLC$862k
D. E. Shaw & Co.$463k

Exited (6)

Man Group PLCwas $21m
Tudor Investment Corpwas $5.0m
Point72 Asset Management LPwas $2.8m
Winton Group Ltdwas $1.8m
Schonfeld Strategic Advisors LLCwas $1.2m
PDT Partners LLCwas $988k

Ownership over time

Every quarter on file. A quarter-end value moves with the price as well as with the shares held; buyers and sellers count comparable managers, by shares.

2 in Q4 2024 to 6 in Q2 2026

Tracked managers listing it, at least.

the quarter shown share split complete books; unmarked quarters rest on listed positionsClick a quarter to open it.

Compare with…

Holders over time, buyers and sellers, and the managers holding both, side by side for up to four stocks.

MRX and V →MRX and AXP →MRX and BAC →Choose a stock to compare with MRX →

How much of the picture this is

A 13F is a manager’s long US-listed equity book at a quarter end, filed up to 45 days later. It shows no shorts, cash, bonds or performance, and it is never today’s portfolio. Large books are listed to their largest positions, so a manager missing from this table may still hold a small position below that line. These are 95 tracked managers, not the institutional market.

Which funds own MRX, latest filings →Back to the 13F Explorer →

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Quarter	Holders	Reported value	Buyers	Sellers
Q4 2024	2	$14m	2	0
Q1 2025	4	$50m	4	0
Q2 2025	12	$206m	12	0
Q3 2025	8	$163m	4	6
Q4 2025	5	$165m	12	16
Q1 2026	3	$139m	17	10
Q2 2026	6	$559m	13	14