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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 Mar 2024
the date the book describes
Filed
5 Nov 2026
latest of these filings; the earliest 6 May 2024
Managers listing it
37
at least, of 95 tracked, among listed positions
Comparable managers
93
filed both Q4 2023 and Q1 2024; 33 listed it in both
Shares listed
281,260,967
combined, among listed positions
Reported value
$37.1bn
combined, at the quarter end

Among the 93 comparable managers: 21 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 Q1 2024

Share of 13F value is the position’s reported value over everything the manager reported that quarter. The share change is against Q4 2023, and only where both filings list the position. A rise in value with no rise in shares is the price, not buying.

37 of 37 holders

ActionFiling
Wellington Management Group LLP86,348,259$11.4bn2.02%Added+752,26015 May 2024 (the filing on sec.gov)
Fidelity (FMR LLC)52,170,919$6.9bn0.46%Added+9,370,9025 Nov 2026 (the filing on sec.gov)
T. Rowe Price Associates Inc29,639,517$3.9bn0.48%Trimmed-447,70015 May 2024 (the filing on sec.gov)
Invesco Ltd16,058,539$2.1bn0.46%Trimmed-699,07114 May 2024 (the filing on sec.gov)
Capital World Investors13,954,017$1.8bn0.30%Added+5,627,92314 May 2024 (the filing on sec.gov)
AllianceBernstein LP11,186,762$1.5bn0.52%Added+2,189,42514 May 2024 (the filing on sec.gov)
MFS Investment Management10,885,435$1.4bn0.43%Trimmed-541,80614 May 2024 (the filing on sec.gov)
Janus Henderson Group Ltd10,461,164$1.4bn0.75%Trimmed-1,595,75315 May 2024 (the filing on sec.gov)
Millennium Management LLC10,069,452$1.3bn0.57%Added+4,021,50015 May 2024 (the filing on sec.gov)
Citadel Advisors LLC7,575,220$1.0bn0.19%Added+1,257,04915 May 2024 (the filing on sec.gov)
Neuberger Berman Group LLC5,524,307$729m0.60%Trimmed-752,85114 Nov 2024 (the filing on sec.gov)
Arrowstreet Capital LP4,747,708$626m0.58%Trimmed-830,58915 May 2024 (the filing on sec.gov)
AQR Capital Management LLC2,238,260$295m0.50%Trimmed-96,82115 May 2024 (the filing on sec.gov)
Bridgewater Associates LP2,090,256$276m1.39%Added+133,19414 May 2024 (the filing on sec.gov)
Two Sigma Advisers LP2,085,600$275m0.64%Trimmed-2,637,30015 May 2024 (the filing on sec.gov)
Capital Research Global Investors2,041,458$269m0.06%Added+1,63314 May 2024 (the filing on sec.gov)
D. E. Shaw & Co.2,021,415$267m0.23%Trimmed-421,01515 May 2024 (the filing on sec.gov)
Man Group PLC1,954,623$258m0.65%Added+1,060,23615 May 2024 (the filing on sec.gov)
Marshall Wace LLP1,949,989$257m0.39%Trimmed-2,039,97115 May 2024 (the filing on sec.gov)
Jane Street Group LLC1,592,465$210munder 0.1%Addedn.a.16 May 2024 (the filing on sec.gov)
Balyasny Asset Management LLC1,290,930$170m0.30%Added+767,96613 May 2024 (the filing on sec.gov)
Susquehanna International Group LLP1,175,088$155munder 0.1%Addedn.a.7 May 2024 (the filing on sec.gov)
Woodline Partners LP976,017$129m1.19%Added+181,56115 May 2024 (the filing on sec.gov)
Artisan Partners LP690,939$91m0.13%Trimmed-2,00413 May 2024 (the filing on sec.gov)
Two Sigma Investments LP611,403$81m0.19%Trimmed-1,616,11615 May 2024 (the filing on sec.gov)
Page 1 of 2

Largest increases and reductions, by shares

Q4 2023 to Q1 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 (1)

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.
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.

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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 →