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GMAB in the 13F filings

Genmab A S · CUSIP 372303206

Sector · Pharmaceuticals and biotechnologyTheme · Healthcare: biopharma and medtech· L3VLUP-definedTheme · Pharmaceutical preparations
Quarter
Q2 2026Q1 2026Q4 2025Q3 2025Q2 2025Q1 2025Q4 2024Q3 2024Q2 2024Q1 2024Q4 2023Q3 2023
Quarter end
31 Dec 2025
the date the book describes
Filed
27 Oct 2026
latest of these filings; the earliest 10 Feb 2026
Managers listing it
17
at least, of 95 tracked, among listed positions
Comparable managers
92
filed both Q3 2025 and Q4 2025; 7 listed it in both
Shares listed
24,023,669
combined, among listed positions
Reported value
$740m
combined, at the quarter end

Among the 92 comparable managers: 8 buyers (opened or added shares) and 10 sellers (trimmed or exited), at least, among listed positions. Their net change in shares was +939,815.

Managers listing GMAB in Q4 2025

Share of 13F value is the position’s reported value over everything the manager reported that quarter. The share change is against Q3 2025, and only where both filings list the position. A rise in value with no rise in shares is the price, not buying.

17 of 17 holders

ActionFiling
AllianceBernstein LP10,877,094$335m0.11%Trimmed-76,81917 Feb 2026 (the filing on sec.gov)
Arrowstreet Capital LP4,978,058$153m0.09%Added+1,334,91913 Feb 2026 (the filing on sec.gov)
Renaissance Technologies LLC3,492,850$108m0.17%Added+671,30712 Feb 2026 (the filing on sec.gov)
Fidelity (FMR LLC)1,057,340$33munder 0.1%Trimmed-62,37417 Feb 2026 (the filing on sec.gov)
Two Sigma Investments LP895,843$28munder 0.1%Trimmed-495,37217 Feb 2026 (the filing on sec.gov)
Susquehanna International Group LLP612,323$19munder 0.1%Added+594,37117 Feb 2026 (the filing on sec.gov)
Balyasny Asset Management LLC379,364$12munder 0.1%Newnew17 Feb 2026 (the filing on sec.gov)
Woodline Partners LP369,188$11munder 0.1%Trimmed-89,98817 Feb 2026 (the filing on sec.gov)
Marshall Wace LLP358,440$11munder 0.1%Trimmed-174,76913 Feb 2026 (the filing on sec.gov)
Two Sigma Advisers LP340,000$10munder 0.1%Trimmed-1,092,80017 Feb 2026 (the filing on sec.gov)
Hudson Bay Capital Management LP325,000$10munder 0.1%Added+60,00013 Feb 2026 (the filing on sec.gov)
Millennium Management LLC94,573$2.9munder 0.1%Added+3,66017 Feb 2026 (the filing on sec.gov)
Voloridge Investment Management LLC84,302$2.6munder 0.1%Trimmed-46,51317 Feb 2026 (the filing on sec.gov)
AQR Capital Management LLC82,227$2.5munder 0.1%Added+8,52617 Feb 2026 (the filing on sec.gov)
Neuberger Berman Group LLC56,921$1.8munder 0.1%Added+10,63227 Oct 2026 (the filing on sec.gov)
Citadel Advisors LLC19,102$588kunder 0.1%Trimmed-32,37117 Feb 2026 (the filing on sec.gov)
Acadian Asset Management LLC1,044$32kunder 0.1%Held010 Feb 2026 (the filing on sec.gov)

Largest increases and reductions, by shares

Q3 2025 to Q4 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 (1)

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.
6 in Q3 2024 to 7 in Q2 2026

Tracked managers listing it, at least.

0358102020202120222023202420252026
the quarter shown share split complete books; unmarked quarters rest on listed positionsClick a quarter to open it.
GMAB by quarter
QuarterHoldersReported valueBuyersSellers
Q3 20193$95mn.a.n.a.
Q4 20193$99mn.a.n.a.
Q1 20205$114mn.a.n.a.
Q2 20206$224mn.a.n.a.
Q3 20207$364mn.a.n.a.
Q4 20205$238mn.a.n.a.
Q1 20213$121mn.a.n.a.
Q2 20213$187mn.a.n.a.
Q3 20213$166mn.a.n.a.
Q4 20213$168mn.a.n.a.
Q1 20224$168mn.a.n.a.
Q2 20224$96mn.a.n.a.
Q3 20227$412mn.a.n.a.
Q4 20226$422mn.a.n.a.
Q1 20233$333mn.a.n.a.
Q2 20232$343mn.a.n.a.
Q3 20233$385mn.a.n.a.
Q4 20234$548m40
Q1 20246$540m24
Q2 20246$457m51
Q3 20246$447m31
Q4 20248$480m61
Q1 20258$495m61
Q2 202510$495m37
Q3 20257$643m35
Q4 20255$617m810
Q1 20266$623m1112
Q2 20267$583m156

Compare with…

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

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

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