Penumbra, Inc. (PEN) Ownership
PEN ownership summary
as of October 18, 2026- Institutions
- 88.4% of shares outstanding
- Insiders
- 2.90% of shares outstanding
- Shares outstanding
- 39.4M
- Float
- 38.3M shares available to trade
- Short interest
- 6.56% 2.2M shares short
- Days to cover
- 6.03 short interest up 29.7% vs prior month
- Institutions 88.36%
- Insiders 2.90%
- Other investors 8.74%
PEN top institutional holders
20 largest| # | Holder | % of shares | Shares | Value | Change | Reported |
|---|---|---|---|---|---|---|
| 1 | BlackRock Inc | 10.91% | 4.3M | $1.38B | −32,901 (−0.8%) | June 30, 2026 |
| 2 | HBK INVESTMENTS L P | 4.67% | 1.8M | $589.9M | +204,247 (+12.5%) | June 30, 2026 |
| 3 | Vanguard Capital Management, LLC | 4.34% | 1.7M | $548.6M | +15,389 (+0.9%) | June 30, 2026 |
| 4 | Vanguard Portfolio Management, LLC | 4.23% | 1.7M | $535.0M | +12,799 (+0.8%) | June 30, 2026 |
| 5 | State Street Corp | 3.16% | 1.2M | $398.9M | +57,447 (+4.8%) | June 30, 2026 |
| 6 | ExodusPoint Capital Management, LP | 2.77% | 1.1M | $349.9M | +625,215 (+134.4%) | June 30, 2026 |
| 7 | Balyasny Asset Management LLC | 2.77% | 1.1M | $349.8M | +328,067 (+43.0%) | June 30, 2026 |
| 8 | JPMorgan Chase & Co | 2.72% | 1.1M | $343.8M | +668,835 (+166.1%) | June 30, 2026 |
| 9 | The Goldman Sachs Group Inc | 2.15% | 847K | $271.8M | +126,529 (+17.6%) | June 30, 2026 |
| 10 | Arrowstreet Capital Limited Partnership | 2.12% | 835K | $267.9M | +434,743 (+108.6%) | June 30, 2026 |
| 11 | Geode Capital Management, LLC | 2.02% | 796K | $255.6M | +1,023 (+0.1%) | June 30, 2026 |
| 12 | NORGES BANK | 1.91% | 752K | $241.4M | +645,971 (+607.9%) | June 30, 2026 |
| 13 | UBS Group AG | 1.79% | 704K | $225.8M | +143,487 (+25.6%) | June 30, 2026 |
| 14 | Millennium Management LLC | 1.78% | 701K | $224.8M | −397,525 (−36.2%) | June 30, 2026 |
| 15 | Morgan Stanley - Brokerage Accounts | 1.50% | 592K | $189.9M | +190,468 (+47.5%) | June 30, 2026 |
| 16 | Cnh Partners, LLC | 1.43% | 564K | $180.9M | +140,800 (+33.3%) | June 30, 2026 |
| 17 | Whitebox Advisors, LLC | 1.29% | 507K | $162.6M | +61,880 (+13.9%) | June 30, 2026 |
| 18 | Capital World Investors | 1.22% | 480K | $153.9M | +28,886 (+6.4%) | June 30, 2026 |
| 19 | Citadel Advisors Llc | 1.14% | 449K | $144.0M | +246,038 (+121.4%) | June 30, 2026 |
| 20 | Neuberger Berman Group LLC | 1.11% | 439K | $140.7M | +134,932 (+44.4%) | June 30, 2026 |
Value at the latest close. Change = shares bought or sold in the latest quarterly filing (13F). In the top 20, 18 holders added 4.1M shares and 2 cut 430K.
PEN top mutual fund and ETF holders
20 largest| # | Holder | % of shares | Shares | Value | Change | Reported |
|---|---|---|---|---|---|---|
| 1 | iShares Core S&P Mid-Cap ETF | 3.56% | 1.4M | $450.2M | −504 (−0.0%) | September 30, 2026 |
| 2 | Vanguard MStar Total Stk Mkt Idx Invest | 3.01% | 1.2M | $380.4M | −3,528 (−0.3%) | August 31, 2026 |
| 3 | Vanguard Small Cap Index | 2.14% | 842K | $270.2M | −17,262 (−2.0%) | September 30, 2026 |
| 4 | BlackRock Event Driven Equity Instl | 1.95% | 770K | $247.0M | — | August 31, 2026 |
| 5 | Vanguard MStar Small Cap Growth Indx Inv | 1.19% | 468K | $150.3M | −24,983 (−5.1%) | September 30, 2026 |
| 6 | American Funds SMALLCAP World A | 1.05% | 413K | $132.4M | — | September 30, 2026 |
| 7 | State Street® SPDR® S&P MIDCAP 400® ETF | 0.74% | 291K | $93.4M | +3,605 (+1.3%) | September 30, 2026 |
| 8 | BSF Global Event Driven Z2 USD | 0.67% | 263K | $84.2M | +58,750 (+28.8%) | September 30, 2026 |
| 9 | iShares S&P Mid-Cap 400 Growth ETF | 0.58% | 227K | $72.9M | −242 (−0.1%) | September 30, 2026 |
| 10 | iShares Russell Mid-Cap Growth ETF | 0.54% | 214K | $68.7M | −228 (−0.1%) | September 30, 2026 |
| 11 | State Street SPDR Port S&P 400 Md CpETF | 0.53% | 208K | $66.8M | −296 (−0.1%) | September 30, 2026 |
| 12 | iShares US Medical Devices ETF | 0.49% | 193K | $62.0M | +3,384 (+1.8%) | September 30, 2026 |
| 13 | Fidelity Extended Market Index | 0.48% | 191K | $61.2M | −2,162 (−1.1%) | August 31, 2026 |
| 14 | Arbitrage R | 0.46% | 182K | $58.5M | +87,200 (+91.7%) | August 31, 2026 |
| 15 | iShares Russell Mid-Cap ETF | 0.40% | 157K | $50.3M | +285 (+0.2%) | September 30, 2026 |
| 16 | Fidelity Mid Cap Index | 0.37% | 145K | $46.5M | +673 (+0.5%) | August 31, 2026 |
| 17 | iShares Russell 1000 Growth ETF | 0.36% | 143K | $45.8M | −98 (−0.1%) | September 30, 2026 |
| 18 | BlackRock Health Sciences Opps Inv A | 0.34% | 133K | $42.7M | — | August 31, 2026 |
| 19 | The Merger Fund A | 0.33% | 132K | $42.3M | +69,256 (+110.5%) | June 30, 2026 |
| 20 | Schwab US Mid-Cap ETF™ | 0.30% | 118K | $37.9M | +126 (+0.1%) | September 30, 2026 |
Funds report holdings monthly or quarterly; dates differ by fund.
PEN insider transactions
latest 20| Date | Name | Transaction | Price | Shares | Value |
|---|---|---|---|---|---|
| 2026-04-02 | Harpreet Grewal | Sell | $328.22 | 100 | $32,822 |
| 2026-03-02 | Maggie Yuen | Sell | $342.30 | 2,432 | $832,474 |
| 2026-01-06 | Harpreet Grewal | Sell | $312.64 | 186 | $58,151 |
| 2026-01-02 | Thomas Wilder | Sell | $310.72 | 186 | $57,794 |
| 2025-12-11 | Arani Bose | Sell | $308.82 | 15,000 | $4.6M |
| 2025-12-05 | Johanna Roberts | Sell | $300.13 | 300 | $90,039 |
| 2025-12-02 | Harpreet Grewal | Sell | $292.98 | 100 | $29,298 |
| 2025-12-01 | Johanna Roberts | Sell | $294.94 | 600 | $176,964 |
| 2025-11-25 | Arani Bose | Sell | $300.19 | 7,500 | $2.3M |
| 2025-11-25 | Johanna Roberts | Sell | $300.06 | 1,800 | $540,108 |
| 2025-11-21 | Arani Bose | Sell | $290.56 | 7,500 | $2.2M |
| 2025-11-10 | Johanna Roberts | Sell | $266.98 | 600 | $160,188 |
| 2025-11-04 | Harpreet Grewal | Sell | $227.58 | 186 | $42,330 |
| 2025-11-04 | Harpreet Grewal | Sell | $227.58 | 186 | $42,330 |
| 2025-10-02 | Harpreet Grewal | Sell | $248.61 | 186 | $46,241 |
| 2025-10-01 | Johanna Roberts | Sell | $249.70 | 600 | $149,820 |
| 2025-10-01 | Thomas Wilder | Sell | $253.93 | 186 | $47,231 |
| 2025-09-03 | Adam Elsesser | Sell | $269.65 | 15,800 | $4.3M |
| 2025-09-02 | Harpreet Grewal | Sell | $272.19 | 186 | $50,627 |
| 2025-09-02 | Johanna Roberts | Sell | $270.58 | 600 | $162,348 |
Reported trades by company officers, directors and other filers (including disclosures by members of Congress where EODHD lists them). "—" where the filing gives no share count.
PEN shares outstanding
Year-end shares outstanding, adjusted for splits.
Who owns PEN
Institutional investors own 88.4% of Penumbra's shares and insiders 2.90%. The largest holder is BlackRock Inc with 10.91% of the shares (4.3M), as of June 30, 2026. Among the top 20 institutions, 18 added shares and 2 reduced their stake in the latest filings. Short interest is 6.56% of the float, or 6.03 days of average trading volume. The share count rose 60.7% since 2014.
Related: PEN analyst forecast, PEN key metrics. See the PEN stock overview for the latest quote and news.
PEN ownership FAQ
Who owns the most Penumbra stock?
The largest shareholders of Penumbra are BlackRock Inc (10.91%), HBK INVESTMENTS L P (4.67%), Vanguard Capital Management, LLC (4.34%), Vanguard Portfolio Management, LLC (4.23%), State Street Corp (3.16%).
What percentage of Penumbra is owned by institutions?
Institutions hold 88.4% of Penumbra's shares outstanding; insiders hold 2.90%.
Which funds own Penumbra?
The largest fund holders of Penumbra are iShares Core S&P Mid-Cap ETF (3.56%), Vanguard MStar Total Stk Mkt Idx Invest (3.01%), Vanguard Small Cap Index (2.14%), BlackRock Event Driven Equity Instl (1.95%), Vanguard MStar Small Cap Growth Indx Inv (1.19%).
What is Penumbra's short interest?
2.2M shares of Penumbra were sold short, 6.56% of the float; at the average daily volume it would take 6.03 days to cover.
Are insiders buying or selling Penumbra?
Of the latest 20 reported insider transactions in Penumbra (since September 2, 2025), 0 were purchases and 20 were sales.
How many shares of Penumbra are outstanding?
Penumbra has 39.4M shares outstanding, of which 38.3M are in the public float.