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MRX in the 13F filings

Marex Group PLC · CUSIP G5S37H101

Sector · Other financial servicesTheme · Financial services· L3VLUP-defined
Quarter
Q2 2026Q1 2026Q4 2025Q3 2025Q2 2025Q1 2025Q4 2024
Quarter end
31 Mar 2026
the date the book describes
Filed
27 Oct 2026
latest of these filings; the earliest 12 May 2026
Managers listing it
24
at least, of 95 tracked, among listed positions
Comparable managers
91
filed both Q4 2025 and Q1 2026; 4 listed it in both
Shares listed
13,681,548
combined, among listed positions
Reported value
$599m
combined, at the quarter end

AllianceBernstein LP. Values in this filing are at the previous quarter end's prices; its share count is the quarter end's.

Among the 91 comparable managers: 17 buyers (opened or added shares) and 10 sellers (trimmed or exited), at least, among listed positions. Their net change in shares was +2,710,500.

Managers listing MRX in Q1 2026

Share of 13F value is the position’s reported value over everything the manager reported that quarter. The share change is against Q4 2025, and only where both filings list the position. A rise in value with no rise in shares is the price, not buying.

24 of 24 holders

ActionFiling
Fidelity (FMR LLC)3,481,911$155munder 0.1%Added+2,147,11315 May 2026 (the filing on sec.gov)
T. Rowe Price Associates Inc1,906,029$85munder 0.1%Added+357,39215 May 2026 (the filing on sec.gov)
Two Sigma Investments LP1,681,560$75m0.06%Added+778,43715 May 2026 (the filing on sec.gov)
AllianceBernstein LP1,730,125$66munder 0.1%Trimmed-20,12715 May 2026 (the filing on sec.gov)
Invesco Ltd1,372,768$61munder 0.1%Added+77,79012 May 2026 (the filing on sec.gov)
Artisan Partners LP1,216,883$54m0.09%Added+311,92613 May 2026 (the filing on sec.gov)
Wellington Management Group LLP655,460$29munder 0.1%Trimmed-104,37615 May 2026 (the filing on sec.gov)
Balyasny Asset Management LLC346,690$15munder 0.1%Trimmed-1,049,70015 May 2026 (the filing on sec.gov)
Voloridge Investment Management LLC224,513$10munder 0.1%Trimmed-197,95815 May 2026 (the filing on sec.gov)
Hudson Bay Capital Management LP224,141$10.0munder 0.1%Newnew13 May 2026 (the filing on sec.gov)
Citadel Advisors LLC173,474$7.7munder 0.1%Added+83,41515 May 2026 (the filing on sec.gov)
Walleye Capital LLC159,830$7.1munder 0.1%Added+148,95413 May 2026 (the filing on sec.gov)
Marshall Wace LLP125,494$5.6munder 0.1%Added+11,07715 May 2026 (the filing on sec.gov)
Man Group PLC89,236$4.0munder 0.1%Newnew15 May 2026 (the filing on sec.gov)
Renaissance Technologies LLC80,520$3.6munder 0.1%Trimmed-140,26714 May 2026 (the filing on sec.gov)
Squarepoint Ops LLC64,101$2.9munder 0.1%Added+54,48415 May 2026 (the filing on sec.gov)
Janus Henderson Group Ltd39,441$1.8munder 0.1%Newnew18 May 2026 (the filing on sec.gov)
AQR Capital Management LLC30,850$1.4munder 0.1%Added+5,62915 May 2026 (the filing on sec.gov)
Susquehanna International Group LLP24,716$1.1munder 0.1%Newnew15 May 2026 (the filing on sec.gov)
Neuberger Berman Group LLC22,761$1.0munder 0.1%Added+30127 Oct 2026 (the filing on sec.gov)
Winton Group Ltd13,474$601kunder 0.1%Newnew12 May 2026 (the filing on sec.gov)
Jane Street Group LLC11,810$526kunder 0.1%Trimmed-97712 May 2026 (the filing on sec.gov)
Verition Fund Management LLC5,760$257kunder 0.1%Trimmed-12,24015 May 2026 (the filing on sec.gov)
Freestone Grove Partners LP1$00.00%Newnew15 May 2026 (the filing on sec.gov)

Largest increases and reductions, by shares

Q4 2025 to Q1 2026, among managers that listed it in both quarters or opened it.

Increases

Reductions

New positions and exits

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

New (6)

Exited (3)

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.

051015Q4 2024Q1 2025Q2 2025Q3 2025Q4 2025Q1 2026Q2 2026
the quarter shown share split complete books; unmarked quarters rest on listed positionsClick a quarter to open it.
MRX by quarter
QuarterHoldersReported valueBuyersSellers
Q4 20242$14m20
Q1 20254$50m40
Q2 202512$206m120
Q3 20258$163m46
Q4 20255$165m1216
Q1 20263$139m1710
Q2 20266$559m1314

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 →