L3VLUP
Quarter end
31 Mar 2025
the date the book describes
Filed
5 Nov 2026
latest of these filings; the earliest 2 May 2025
Managers listing it
30
at least, of 95 tracked, among listed positions
Comparable managers
95
filed both Q4 2024 and Q1 2025; 24 listed it in both
Shares listed
54,018,538
combined, among listed positions
Reported value
$25.2bn
combined, at the quarter end

Among the 95 comparable managers: 15 buyers (opened or added shares) and 13 sellers (trimmed or exited), at least, among listed positions. Their net change in shares is not known from listed positions, because at least one of them lists it in only one of the two quarters.

Managers listing MCO in Q1 2025

Share of 13F value is the position’s reported value over everything the manager reported that quarter. The share change is against Q4 2024, and only where both filings list the position. A rise in value with no rise in shares is the price, not buying.

30 of 30 holders

ActionFiling
Berkshire Hathaway Inc24,669,778$11.5bn4.42%Held015 May 2025 (the filing on sec.gov)
TCI Fund Management Ltd13,163,107$6.1bn14.13%Trimmed-83,66215 May 2025 (the filing on sec.gov)
Fidelity (FMR LLC)6,487,008$3.0bn0.19%Added+384,4715 Nov 2026 (the filing on sec.gov)
Akre Capital Management LLC2,435,458$1.1bn10.90%Trimmed-643,46913 May 2025 (the filing on sec.gov)
MFS Investment Management1,586,672$739m0.25%Added+140,1282 May 2025 (the filing on sec.gov)
Invesco Ltd1,018,027$474m0.09%Trimmed-11,53712 May 2025 (the filing on sec.gov)
Baillie Gifford & Co758,516$353m0.31%Trimmed-50,4527 May 2025 (the filing on sec.gov)
Neuberger Berman Group LLC722,525$336m0.28%Trimmed-23,46727 Oct 2026 (the filing on sec.gov)
Acadian Asset Management LLC634,762$296m0.84%Added+146,14121 May 2025 (the filing on sec.gov)
Janus Henderson Group Ltd424,313$196m0.11%Trimmed-3,11215 May 2025 (the filing on sec.gov)
T. Rowe Price Associates Inc369,778$172munder 0.1%Added+4,61714 May 2025 (the filing on sec.gov)
Arrowstreet Capital LP255,197$119m0.10%Trimmed-15,59114 May 2025 (the filing on sec.gov)
Markel Group Inc213,890$100m0.88%Held02 May 2025 (the filing on sec.gov)
Voloridge Investment Management LLC191,926$89m0.33%Addedn.a.15 May 2025 (the filing on sec.gov)
Millennium Management LLC178,653$83munder 0.1%Addedn.a.15 May 2025 (the filing on sec.gov)
AllianceBernstein LP175,994$82munder 0.1%Added+5,94215 May 2025 (the filing on sec.gov)
Man Group PLC155,563$72m0.18%Trimmed-27,06715 May 2025 (the filing on sec.gov)
Two Sigma Investments LP146,590$68m0.15%Added+75,74715 May 2025 (the filing on sec.gov)
Two Sigma Advisers LP146,500$68m0.15%Addedn.a.15 May 2025 (the filing on sec.gov)
Renaissance Technologies LLC112,900$53m0.08%Trimmed-11,50014 May 2025 (the filing on sec.gov)
Artisan Partners LP70,264$33m0.05%Trimmed-1,52014 May 2025 (the filing on sec.gov)
Eisler Capital Management Ltd36,750$17m0.12%Newnew14 May 2025 (the filing on sec.gov)
Schonfeld Strategic Advisors LLC14,299$6.7munder 0.1%Addedn.a.15 May 2025 (the filing on sec.gov)
Woodline Partners LP13,088$6.1munder 0.1%Addedn.a.15 May 2025 (the filing on sec.gov)
GAMCO Investors Inc12,143$5.7m0.06%Added+1,40114 May 2025 (the filing on sec.gov)
Page 1 of 2

Largest increases and reductions, by shares

Q4 2024 to Q1 2025, 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.

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.
31 in Q3 2024 to 31 in Q2 2026

Tracked managers listing it, at least.

0102030402014201620182020202220242026
the quarter shown share split complete books; unmarked quarters rest on listed positionsClick a quarter to open it.
MCO by quarter
QuarterHoldersReported valueBuyersSellers
Q2 201318$3.7bnn.a.n.a.
Q3 201315$4.5bnn.a.n.a.
Q4 201316$4.9bnn.a.n.a.
Q1 201417$5.0bnn.a.n.a.
Q2 201420$5.4bnn.a.n.a.
Q3 201419$5.6bnn.a.n.a.
Q4 201421$4.8bnn.a.n.a.
Q1 201524$5.5bnn.a.n.a.
Q2 201519$6.1bnn.a.n.a.
Q3 201521$5.6bnn.a.n.a.
Q4 201520$5.6bnn.a.n.a.
Q1 201619$4.9bnn.a.n.a.
Q2 201618$4.9bnn.a.n.a.
Q3 201620$5.9bnn.a.n.a.
Q4 201624$5.0bnn.a.n.a.
Q1 201721$6.1bnn.a.n.a.
Q2 201719$6.8bnn.a.n.a.
Q3 201719$7.9bnn.a.n.a.
Q4 201723$8.4bnn.a.n.a.
Q1 201827$9.4bnn.a.n.a.
Q2 201824$9.9bnn.a.n.a.
Q3 201821$9.6bnn.a.n.a.
Q4 201818$8.8bnn.a.n.a.
Q1 201920$11.3bnn.a.n.a.
Q2 201924$12.1bnn.a.n.a.
Q3 201925$12.6bnn.a.n.a.
Q4 201921$14.4bnn.a.n.a.
Q1 202026$12.8bnn.a.n.a.
Q2 202028$16.4bnn.a.n.a.
Q3 202030$17.0bnn.a.n.a.
Q4 202021$16.9bnn.a.n.a.
Q1 202117$16.9bnn.a.n.a.
Q2 202116$20.2bnn.a.n.a.
Q3 202125$19.9bnn.a.n.a.
Q4 202125$22.0bnn.a.n.a.
Q1 202222$19.1bnn.a.n.a.
Q2 202219$15.4bnn.a.n.a.
Q3 202221$13.6bnn.a.n.a.
Q4 202217$15.5bnn.a.n.a.
Q1 202320$17.3bnn.a.n.a.
Q2 202325$19.4bnn.a.n.a.
Q3 202321$17.2bnn.a.n.a.
Q4 202321$22.3bn127
Q1 202422$21.9bn1011
Q2 202424$23.6bn139
Q3 202431$26.8bn1513
Q4 202431$25.7bn1116
Q1 202530$25.2bn1513
Q2 202530$26.8bn1413
Q3 202531$26.0bn1514
Q4 202532$27.7bn1726
Q1 202628$23.9bn2024
Q2 202631$24.9bn2120

Compare with…

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

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

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 MCO, latest filings →Back to the 13F Explorer →