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MRK in the 13F filings

Merck & Co Inc · CUSIP 58933Y105

Sector · Pharmaceuticals and biotechnologyTheme · Healthcare: biopharma and medtech· L3VLUP-definedTheme · Pharmaceutical preparations
Quarter
Q3 2026 · early filersQ2 2026Q1 2026Q4 2025Q3 2025Q2 2025Q1 2025Q4 2024Q3 2024Q2 2024Q1 2024Q4 2023
Quarter end
31 Dec 2024
the date the book describes
Filed
5 Nov 2026
latest of these filings; the earliest 11 Feb 2025
Managers listing it
35
at least, of 95 tracked, among listed positions
Comparable managers
94
filed both Q3 2024 and Q4 2024; 32 listed it in both
Shares listed
238,693,675
combined, among listed positions
Reported value
$23.7bn
combined, at the quarter end

Among the 94 comparable managers: 18 buyers (opened or added shares) and 19 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 MRK in Q4 2024

Share of 13F value is the position’s reported value over everything the manager reported that quarter. The share change is against Q3 2024, and only where both filings list the position. A rise in value with no rise in shares is the price, not buying.

35 of 35 holders

ActionFiling
Wellington Management Group LLP80,742,030$8.0bn1.47%Added+4,932,64712 Feb 2025 (the filing on sec.gov)
Fidelity (FMR LLC)37,360,572$3.7bn0.22%Trimmed-12,345,7325 Nov 2026 (the filing on sec.gov)
Invesco Ltd15,452,240$1.5bn0.28%Added+2,847,93413 Feb 2025 (the filing on sec.gov)
T. Rowe Price Associates Inc12,511,007$1.2bn0.14%Trimmed-9,961,06914 Feb 2025 (the filing on sec.gov)
AllianceBernstein LP11,109,679$1.1bn0.38%Trimmed-917,80612 Feb 2025 (the filing on sec.gov)
MFS Investment Management8,197,687$816m0.26%Trimmed-396,58912 Feb 2025 (the filing on sec.gov)
Capital World Investors7,906,912$787m0.12%Trimmed-7,327,77813 Feb 2025 (the filing on sec.gov)
Arrowstreet Capital LP6,473,094$644m0.52%Trimmed-486,03912 Feb 2025 (the filing on sec.gov)
D. E. Shaw & Co.6,374,804$634m0.47%Trimmed-386,29114 Feb 2025 (the filing on sec.gov)
Harris Associates LP6,244,450$621m0.82%Added+3,301,42914 Feb 2025 (the filing on sec.gov)
Janus Henderson Group Ltd5,864,505$583m0.30%Trimmed-2,905,12114 Feb 2025 (the filing on sec.gov)
AQR Capital Management LLC5,377,752$533m0.69%Added+2,354,72314 Feb 2025 (the filing on sec.gov)
Citadel Advisors LLC5,281,710$525m0.09%Trimmed-1,759,97914 Feb 2025 (the filing on sec.gov)
Two Sigma Advisers LP4,887,100$486m1.12%Added+623,00014 Feb 2025 (the filing on sec.gov)
Capital Research Global Investors4,473,385$445m0.09%Added+2,431,43013 Feb 2025 (the filing on sec.gov)
Millennium Management LLC3,580,963$356m0.17%Added+1,783,98714 Feb 2025 (the filing on sec.gov)
Voloridge Investment Management LLC2,320,806$231m0.82%Added+367,52414 Feb 2025 (the filing on sec.gov)
Two Sigma Investments LP1,928,829$192m0.42%Trimmed-8,10414 Feb 2025 (the filing on sec.gov)
Squarepoint Ops LLC1,839,093$183m0.18%Added+321,06314 Feb 2025 (the filing on sec.gov)
Balyasny Asset Management LLC1,656,127$165m0.25%Added+708,45214 Feb 2025 (the filing on sec.gov)
Bridgewater Associates LP1,439,430$143m0.66%Trimmed-114,84013 Feb 2025 (the filing on sec.gov)
Neuberger Berman Group LLC1,386,427$138m0.11%Trimmed-145,83213 Feb 2025 (the filing on sec.gov)
Renaissance Technologies LLC1,381,636$137m0.20%Added+295,75813 Feb 2025 (the filing on sec.gov)
Man Group PLC1,260,906$125m0.33%Trimmed-565,37414 Feb 2025 (the filing on sec.gov)
Artisan Partners LP1,053,876$105m0.16%Added+344,45712 Feb 2025 (the filing on sec.gov)
Page 1 of 2

Largest increases and reductions, by shares

Q3 2024 to Q4 2024, 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 (2)

Exited (2)

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.
38 in Q3 2024 to 25 in Q2 2026

Tracked managers listing it, at least.

02040602014201620182020202220242026
the quarter shown share split complete books; unmarked quarters rest on listed positionsClick a quarter to open it.
MRK by quarter
QuarterHoldersReported valueBuyersSellers
Q2 201323$25.9bnn.a.n.a.
Q3 201324$25.4bnn.a.n.a.
Q4 201323$27.1bnn.a.n.a.
Q1 201424$31.2bnn.a.n.a.
Q2 201428$30.6bnn.a.n.a.
Q3 201432$30.5bnn.a.n.a.
Q4 201430$28.6bnn.a.n.a.
Q1 201529$28.8bnn.a.n.a.
Q2 201529$27.1bnn.a.n.a.
Q3 201525$23.0bnn.a.n.a.
Q4 201528$23.9bnn.a.n.a.
Q1 201628$23.8bnn.a.n.a.
Q2 201627$25.9bnn.a.n.a.
Q3 201627$27.5bnn.a.n.a.
Q4 201626$24.4bnn.a.n.a.
Q1 201731$24.7bnn.a.n.a.
Q2 201734$24.0bnn.a.n.a.
Q3 201731$23.7bnn.a.n.a.
Q4 201732$20.0bnn.a.n.a.
Q1 201830$17.5bnn.a.n.a.
Q2 201827$19.3bnn.a.n.a.
Q3 201827$22.9bnn.a.n.a.
Q4 201826$24.4bnn.a.n.a.
Q1 201926$24.4bnn.a.n.a.
Q2 201928$23.3bnn.a.n.a.
Q3 201931$23.2bnn.a.n.a.
Q4 201934$24.0bnn.a.n.a.
Q1 202033$18.5bnn.a.n.a.
Q2 202034$18.6bnn.a.n.a.
Q3 202035$20.2bnn.a.n.a.
Q4 202034$19.1bnn.a.n.a.
Q1 202133$16.6bnn.a.n.a.
Q2 202131$15.1bnn.a.n.a.
Q3 202131$15.2bnn.a.n.a.
Q4 202126$15.0bnn.a.n.a.
Q1 202234$17.4bnn.a.n.a.
Q2 202234$19.0bnn.a.n.a.
Q3 202235$17.2bnn.a.n.a.
Q4 202235$25.2bnn.a.n.a.
Q1 202333$26.6bnn.a.n.a.
Q2 202334$30.1bnn.a.n.a.
Q3 202339$26.7bnn.a.n.a.
Q4 202341$29.3bn2220
Q1 202437$37.1bn2119
Q2 202438$33.0bn2118
Q3 202438$29.1bn2317
Q4 202435$23.7bn1819
Q1 202536$20.8bn2018
Q2 202531$18.5bn1813
Q3 202536$19.0bn1818
Q4 202532$26.8bn2519
Q1 202630$28.9bn1327
Q2 202625$29.2bn1424

Compare with…

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

MRK and LLY →MRK and JNJ →MRK and VRTX →Choose a stock to compare with MRK →

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