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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 2023
the date the book describes
Filed
5 Nov 2026
latest of these filings; the earliest 8 Feb 2024
Managers listing it
41
at least, of 95 tracked, among listed positions
Comparable managers
93
filed both Q3 2023 and Q4 2023; 34 listed it in both
Shares listed
268,716,548
combined, among listed positions
Reported value
$29.3bn
combined, at the quarter end

Among the 93 comparable managers: 22 buyers (opened or added shares) and 20 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 2023

Share of 13F value is the position’s reported value over everything the manager reported that quarter. The share change is against Q3 2023, and only where both filings list the position. A rise in value with no rise in shares is the price, not buying.

41 of 41 holders

ActionFiling
Wellington Management Group LLP85,595,999$9.3bn1.74%Added+3,153,33312 Feb 2024 (the filing on sec.gov)
Fidelity (FMR LLC)42,800,017$4.7bn0.36%Added+4,654,8195 Nov 2026 (the filing on sec.gov)
T. Rowe Price Associates Inc30,087,217$3.3bn0.44%Added+809,05216 Feb 2024 (the filing on sec.gov)
Invesco Ltd16,757,610$1.8bn0.43%Trimmed-915,20713 Feb 2024 (the filing on sec.gov)
Janus Henderson Group Ltd12,056,917$1.3bn0.78%Trimmed-273,17814 Feb 2024 (the filing on sec.gov)
MFS Investment Management11,427,241$1.2bn0.40%Trimmed-674,6608 Feb 2024 (the filing on sec.gov)
AllianceBernstein LP8,997,337$981m0.38%Trimmed-392,11514 Feb 2024 (the filing on sec.gov)
Capital World Investors8,326,094$908m0.16%Trimmed-3,302,74813 Feb 2024 (the filing on sec.gov)
Citadel Advisors LLC6,318,171$689m0.14%Trimmed-358,93614 Feb 2024 (the filing on sec.gov)
Neuberger Berman Group LLC6,277,158$684m0.60%Trimmed-503,15614 Nov 2024 (the filing on sec.gov)
Millennium Management LLC6,047,952$659m0.29%Added+2,627,48214 Feb 2024 (the filing on sec.gov)
Arrowstreet Capital LP5,578,297$608m0.64%Trimmed-3,913,44714 Feb 2024 (the filing on sec.gov)
Two Sigma Advisers LP4,722,900$515m1.21%Added+3,534,20214 Feb 2024 (the filing on sec.gov)
Marshall Wace LLP3,989,960$435m0.74%Added+1,938,55514 Feb 2024 (the filing on sec.gov)
D. E. Shaw & Co.2,442,430$266m0.23%Added+750,29014 Feb 2024 (the filing on sec.gov)
AQR Capital Management LLC2,335,081$254m0.48%Trimmed-212,42314 Feb 2024 (the filing on sec.gov)
Two Sigma Investments LP2,227,519$243m0.56%Added+1,329,34114 Feb 2024 (the filing on sec.gov)
Capital Research Global Investors2,039,825$222m0.05%Trimmed-45913 Feb 2024 (the filing on sec.gov)
Bridgewater Associates LP1,957,062$213m1.19%Added+333,81414 Feb 2024 (the filing on sec.gov)
Point72 Asset Management LP1,707,836$186m0.45%Added+1,449,48414 Feb 2024 (the filing on sec.gov)
Squarepoint Ops LLC1,395,711$152m0.29%Added+462,30014 Feb 2024 (the filing on sec.gov)
Man Group PLC894,387$98m0.27%Added+683,71014 Feb 2024 (the filing on sec.gov)
Voloridge Investment Management LLC827,788$90m0.36%Newnew14 Feb 2024 (the filing on sec.gov)
Woodline Partners LP794,456$87m0.94%Trimmed-88,04414 Feb 2024 (the filing on sec.gov)
Artisan Partners LP692,943$76m0.12%Added+15,68412 Feb 2024 (the filing on sec.gov)
Page 1 of 2

Largest increases and reductions, by shares

Q3 2023 to Q4 2023, 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 (7)

Exited (1)

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 →