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REGN in the 13F filings

Regeneron Pharmaceuticals · CUSIP 75886F107

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 2026
the date the book describes
Filed
27 Oct 2026
latest of these filings; the earliest 12 May 2026
Managers listing it
37
at least, of 95 tracked, among listed positions
Comparable managers
91
filed both Q4 2025 and Q1 2026; 29 listed it in both
Shares listed
19,888,849
combined, among listed positions
Reported value
$15.4bn
combined, at the quarter end

AllianceBernstein LP. Values in this filing are at the previous quarter end's prices; its share count is the quarter end's.

Among the 91 comparable managers: 14 buyers (opened or added shares) and 26 sellers (trimmed or exited), at least, among listed positions. Their net change in shares was -907,788.

Managers listing REGN in Q1 2026

Share of 13F value is the position’s reported value over everything the manager reported that quarter. The share change is against Q4 2025, 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
Dodge & Cox4,458,238$3.4bn1.89%Trimmed-138,12014 May 2026 (the filing on sec.gov)
Invesco Ltd3,905,109$3.0bn0.29%Trimmed-6,38712 May 2026 (the filing on sec.gov)
T. Rowe Price Associates Inc2,177,527$1.7bn0.19%Added+227,73015 May 2026 (the filing on sec.gov)
Wellington Management Group LLP1,837,459$1.4bn0.27%Added+1,172,99415 May 2026 (the filing on sec.gov)
Fidelity (FMR LLC)1,518,192$1.2bn0.06%Trimmed-801,37415 May 2026 (the filing on sec.gov)
Capital World Investors1,419,000$1.1bn0.15%Added+20,99713 May 2026 (the filing on sec.gov)
AQR Capital Management LLC1,231,008$946m0.43%Added+235,29815 May 2026 (the filing on sec.gov)
Two Sigma Investments LP812,236$628m0.51%Added+531,08515 May 2026 (the filing on sec.gov)
Neuberger Berman Group LLC427,129$330m0.25%Added+5,00227 Oct 2026 (the filing on sec.gov)
AllianceBernstein LP426,914$330m0.11%Trimmed-51,47515 May 2026 (the filing on sec.gov)
Man Group PLC315,212$244m0.44%Added+97,10015 May 2026 (the filing on sec.gov)
Janus Henderson Group Ltd209,248$162m0.08%Added+3,57618 May 2026 (the filing on sec.gov)
Arrowstreet Capital LP171,571$133m0.07%Trimmed-23,12414 May 2026 (the filing on sec.gov)
Squarepoint Ops LLC162,814$126m0.15%Added+160,12815 May 2026 (the filing on sec.gov)
Acadian Asset Management LLC151,191$117m0.17%Trimmed-294,60413 May 2026 (the filing on sec.gov)
Southeastern Asset Management Inc130,662$101m4.97%Trimmed-35,13015 May 2026 (the filing on sec.gov)
Capital Research Global Investors101,891$79munder 0.1%Trimmed-1,44513 May 2026 (the filing on sec.gov)
Woodline Partners LP67,751$52m0.20%Added+2,78315 May 2026 (the filing on sec.gov)
Renaissance Technologies LLC66,802$52m0.08%Added+57,72014 May 2026 (the filing on sec.gov)
Millennium Management LLC62,730$48munder 0.1%Trimmed-317,03815 May 2026 (the filing on sec.gov)
Citadel Advisors LLC47,687$37munder 0.1%Trimmed-97,28315 May 2026 (the filing on sec.gov)
Hudson Bay Capital Management LP32,001$25m0.09%Added+5,87413 May 2026 (the filing on sec.gov)
Freestone Grove Partners LP30,625$24m0.17%Trimmed-10,78415 May 2026 (the filing on sec.gov)
Susquehanna International Group LLP30,620$24munder 0.1%Trimmed-61,84115 May 2026 (the filing on sec.gov)
D. E. Shaw & Co.22,730$18munder 0.1%Trimmed-132,74515 May 2026 (the filing on sec.gov)
Page 1 of 2

Largest increases and reductions, by shares

Q4 2025 to Q1 2026, 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.
31 in Q3 2024 to 22 in Q2 2026

Tracked managers listing it, at least.

0102030402014201620182020202220242026
the quarter shown share split complete books; unmarked quarters rest on listed positionsClick a quarter to open it.
REGN by quarter
QuarterHoldersReported valueBuyersSellers
Q2 201320$8.0bnn.a.n.a.
Q3 201319$10.8bnn.a.n.a.
Q4 201317$8.9bnn.a.n.a.
Q1 201418$8.8bnn.a.n.a.
Q2 201420$8.4bnn.a.n.a.
Q3 201422$10.7bnn.a.n.a.
Q4 201416$12.3bnn.a.n.a.
Q1 201518$13.2bnn.a.n.a.
Q2 201516$14.7bnn.a.n.a.
Q3 201521$12.9bnn.a.n.a.
Q4 201520$15.3bnn.a.n.a.
Q1 201624$11.3bnn.a.n.a.
Q2 201620$10.5bnn.a.n.a.
Q3 201618$12.0bnn.a.n.a.
Q4 201622$10.4bnn.a.n.a.
Q1 201718$10.3bnn.a.n.a.
Q2 201723$13.6bnn.a.n.a.
Q3 201721$11.6bnn.a.n.a.
Q4 201727$9.4bnn.a.n.a.
Q1 201827$8.5bnn.a.n.a.
Q2 201824$9.2bnn.a.n.a.
Q3 201827$10.8bnn.a.n.a.
Q4 201828$9.9bnn.a.n.a.
Q1 201928$10.4bnn.a.n.a.
Q2 201929$8.3bnn.a.n.a.
Q3 201924$7.1bnn.a.n.a.
Q4 201918$9.0bnn.a.n.a.
Q1 202027$13.0bnn.a.n.a.
Q2 202023$19.8bnn.a.n.a.
Q3 202024$17.4bnn.a.n.a.
Q4 202026$15.2bnn.a.n.a.
Q1 202122$13.7bnn.a.n.a.
Q2 202127$15.3bnn.a.n.a.
Q3 202126$15.5bnn.a.n.a.
Q4 202128$16.3bnn.a.n.a.
Q1 202225$19.2bnn.a.n.a.
Q2 202226$16.5bnn.a.n.a.
Q3 202224$19.0bnn.a.n.a.
Q4 202230$20.2bnn.a.n.a.
Q1 202332$22.3bnn.a.n.a.
Q2 202328$18.8bnn.a.n.a.
Q3 202326$21.1bnn.a.n.a.
Q4 202335$21.9bn2214
Q1 202428$23.6bn1220
Q2 202428$25.6bn1515
Q3 202431$25.0bn1715
Q4 202427$13.8bn1712
Q1 202529$12.2bn2010
Q2 202532$9.3bn2410
Q3 202533$10.1bn2212
Q4 202533$16.3bn2023
Q1 202624$15.2bn1426
Q2 202622$10.6bn2415

Compare with…

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

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

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