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PEN in the 13F filings

Penumbra Inc · CUSIP 70975L107

Sector · Medical devices and instrumentsTheme · Healthcare: biopharma and medtech· L3VLUP-definedTheme · Surgical, medical and electromedical devices
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 8 May 2026
Managers listing it
34
at least, of 95 tracked, among listed positions
Comparable managers
91
filed both Q4 2025 and Q1 2026; 14 listed it in both
Shares listed
8,275,904
combined, among listed positions
Reported value
$2.7bn
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: 23 buyers (opened or added shares) and 15 sellers (trimmed or exited), at least, among listed positions. Their net change in shares was -5,084,397.

Managers listing PEN 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.

34 of 34 holders

ActionFiling
Millennium Management LLC1,098,136$361m0.15%Added+420,30415 May 2026 (the filing on sec.gov)
Baillie Gifford & Co840,427$276m0.28%Trimmed-35,8988 May 2026 (the filing on sec.gov)
Balyasny Asset Management LLC762,096$250m0.32%Added+600,18515 May 2026 (the filing on sec.gov)
Invesco Ltd538,197$177munder 0.1%Trimmed-100,10812 May 2026 (the filing on sec.gov)
Fidelity (FMR LLC)496,107$163munder 0.1%Trimmed-4,635,83515 May 2026 (the filing on sec.gov)
ExodusPoint Capital Management LP465,215$153m1.21%Added+443,46514 May 2026 (the filing on sec.gov)
Capital World Investors450,815$148munder 0.1%Added+24,35913 May 2026 (the filing on sec.gov)
Tudor Investment Corp411,118$135m0.25%Newnew15 May 2026 (the filing on sec.gov)
Arrowstreet Capital LP400,160$131m0.07%Added+226,31414 May 2026 (the filing on sec.gov)
Hudson Bay Capital Management LP349,038$115m0.40%Newnew13 May 2026 (the filing on sec.gov)
Neuberger Berman Group LLC303,621$100m0.08%Added+298,57827 Oct 2026 (the filing on sec.gov)
Woodline Partners LP241,597$79m0.30%Added+38,61515 May 2026 (the filing on sec.gov)
AllianceBernstein LP226,317$70munder 0.1%Added+68,01615 May 2026 (the filing on sec.gov)
Soros Fund Management LLC203,434$67m0.73%Newnew15 May 2026 (the filing on sec.gov)
Citadel Advisors LLC202,725$67munder 0.1%Trimmed-787,55015 May 2026 (the filing on sec.gov)
D. E. Shaw & Co.201,950$66munder 0.1%Added+194,42615 May 2026 (the filing on sec.gov)
Caxton Associates LLP184,663$61m1.37%Newnew14 May 2026 (the filing on sec.gov)
Janus Henderson Group Ltd167,054$55munder 0.1%Trimmed-308,84418 May 2026 (the filing on sec.gov)
Squarepoint Ops LLC147,806$49m0.06%Newnew15 May 2026 (the filing on sec.gov)
Holocene Advisors LP110,614$36m0.09%Trimmed-360,73415 May 2026 (the filing on sec.gov)
AQR Capital Management LLC77,364$25munder 0.1%Trimmed-107,57715 May 2026 (the filing on sec.gov)
Man Group PLC74,670$25munder 0.1%Trimmed-2,68815 May 2026 (the filing on sec.gov)
Verition Fund Management LLC68,000$22m0.14%Added+56,70015 May 2026 (the filing on sec.gov)
Two Sigma Investments LP58,219$19munder 0.1%Added+33,35915 May 2026 (the filing on sec.gov)
Susquehanna International Group LLP45,531$15munder 0.1%Newnew15 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 (9)

Exited (4)

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.
10 in Q3 2024 to 17 in Q2 2026

Tracked managers listing it, at least.

0510152020162017201820192020202120222023202420252026
the quarter shown share split complete books; unmarked quarters rest on listed positionsClick a quarter to open it.
PEN by quarter
QuarterHoldersReported valueBuyersSellers
Q3 20153$19mn.a.n.a.
Q4 20152$26mn.a.n.a.
Q1 20162$13mn.a.n.a.
Q2 20162$52mn.a.n.a.
Q3 20165$448mn.a.n.a.
Q4 20165$409mn.a.n.a.
Q1 20176$565mn.a.n.a.
Q2 20175$578mn.a.n.a.
Q3 20176$613mn.a.n.a.
Q4 20174$625mn.a.n.a.
Q1 20185$785mn.a.n.a.
Q2 201811$955mn.a.n.a.
Q3 20189$998mn.a.n.a.
Q4 20189$1.2bnn.a.n.a.
Q1 20199$1.6bnn.a.n.a.
Q2 201910$1.8bnn.a.n.a.
Q3 20198$1.4bnn.a.n.a.
Q4 20199$1.4bnn.a.n.a.
Q1 202011$1.6bnn.a.n.a.
Q2 202010$1.8bnn.a.n.a.
Q3 202013$2.3bnn.a.n.a.
Q4 202010$2.5bnn.a.n.a.
Q1 202114$3.6bnn.a.n.a.
Q2 202112$3.3bnn.a.n.a.
Q3 202113$3.3bnn.a.n.a.
Q4 202113$3.5bnn.a.n.a.
Q1 20229$2.5bnn.a.n.a.
Q2 20229$1.3bnn.a.n.a.
Q3 202211$2.0bnn.a.n.a.
Q4 202213$2.6bnn.a.n.a.
Q1 20239$3.5bnn.a.n.a.
Q2 202319$4.2bnn.a.n.a.
Q3 202314$2.8bnn.a.n.a.
Q4 202311$3.3bn65
Q1 202411$2.6bn38
Q2 202410$2.0bn65
Q3 202410$2.0bn64
Q4 202411$2.4bn74
Q1 202514$2.9bn94
Q2 202515$2.7bn116
Q3 202510$2.9bn66
Q4 202516$3.8bn1813
Q1 202620$2.1bn2315
Q2 202617$2.2bn1818

Compare with…

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

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

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