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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
30 Sep 2025
the date the book describes
Filed
27 Oct 2026
latest of these filings; the earliest 29 Oct 2025
Managers listing it
36
at least, of 95 tracked, among listed positions
Comparable managers
95
filed both Q2 2025 and Q3 2025; 30 listed it in both
Shares listed
226,864,549
combined, among listed positions
Reported value
$19.0bn
combined, at the quarter end

Among the 95 comparable managers: 18 buyers (opened or added shares) and 18 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 Q3 2025

Share of 13F value is the position’s reported value over everything the manager reported that quarter. The share change is against Q2 2025, and only where both filings list the position. A rise in value with no rise in shares is the price, not buying.

36 of 36 holders

ActionFiling
Wellington Management Group LLP75,279,104$6.3bn1.11%Trimmed-1,577,38814 Nov 2025 (the filing on sec.gov)
Fidelity (FMR LLC)33,426,750$2.8bn0.15%Added+1,860,62513 Nov 2025 (the filing on sec.gov)
Invesco Ltd19,844,936$1.7bn0.26%Added+2,821,76613 Nov 2025 (the filing on sec.gov)
Arrowstreet Capital LP18,708,703$1.6bn0.99%Trimmed-747,39313 Nov 2025 (the filing on sec.gov)
T. Rowe Price Associates Inc13,601,321$1.1bn0.12%Added+2,803,33114 Nov 2025 (the filing on sec.gov)
AQR Capital Management LLC10,658,099$851m0.55%Added+1,870,82714 Nov 2025 (the filing on sec.gov)
Harris Associates LP9,823,608$824m1.32%Added+692,29014 Nov 2025 (the filing on sec.gov)
AllianceBernstein LP8,229,793$691m0.22%Trimmed-624,38314 Nov 2025 (the filing on sec.gov)
MFS Investment Management7,549,020$634m0.20%Trimmed-130,84629 Oct 2025 (the filing on sec.gov)
D. E. Shaw & Co.3,467,852$291m0.16%Trimmed-6,899,93714 Nov 2025 (the filing on sec.gov)
Neuberger Berman Group LLC2,612,013$219m0.16%Added+1,369,30627 Oct 2026 (the filing on sec.gov)
Man Group PLC2,570,911$216m0.38%Trimmed-377,19114 Nov 2025 (the filing on sec.gov)
Two Sigma Advisers LP2,320,900$195m0.39%Trimmed-3,357,70014 Nov 2025 (the filing on sec.gov)
Capital Research Global Investors2,310,615$194munder 0.1%Trimmed-1,151,65413 Nov 2025 (the filing on sec.gov)
Acadian Asset Management LLC2,202,965$185m0.32%Trimmed-1,975,42013 Nov 2025 (the filing on sec.gov)
Janus Henderson Group Ltd2,115,541$178m0.08%Added+1,573,42414 Nov 2025 (the filing on sec.gov)
Two Sigma Investments LP1,969,101$165m0.25%Trimmed-469,24714 Nov 2025 (the filing on sec.gov)
Artisan Partners LP1,334,597$112m0.16%Added+33,84912 Nov 2025 (the filing on sec.gov)
Point72 Asset Management LP1,262,753$106m0.18%Addedn.a.14 Nov 2025 (the filing on sec.gov)
Squarepoint Ops LLC1,135,068$95m0.10%Trimmed-1,967,51414 Nov 2025 (the filing on sec.gov)
Voloridge Investment Management LLC938,715$79m0.26%Trimmed-807,41614 Nov 2025 (the filing on sec.gov)
Woodline Partners LP908,544$76m0.36%Added+130,11814 Nov 2025 (the filing on sec.gov)
Marshall Wace LLP883,900$74m0.08%Trimmed-2,260,60013 Nov 2025 (the filing on sec.gov)
Tudor Investment Corp787,366$66m0.11%Newnew9 Dec 2025 (the filing on sec.gov)
Balyasny Asset Management LLC684,957$57m0.07%Addedn.a.14 Nov 2025 (the filing on sec.gov)
Page 1 of 2

Largest increases and reductions, by shares

Q2 2025 to Q3 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.

New (3)

Exited (0)

No exit shown by a manager’s own filing.

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 →