PEN — Penumbra Inc
Price · 2024-08-26 → 2026-08-21
499 daily closes shownAnonymous view is capped at two years of history. A free account extends it to five, and Pro opens the whole archive back to 2016-01-04.
Performance
Technicals
Others in Healthcare
Measured signals that fired on PEN
| date | signal | measured base rate |
|---|---|---|
| 2026-08-03 | Bollinger bandwidth breaks out of its own compression structure | -0.63% over 21 days · t = -2.80 · n = 7,196 statistically distinguishable from its control group |
| 2026-06-01 | Equal lows taken out structure | -0.64% over 21 days · t = -4.75 · n = 55,661 statistically distinguishable from its control group |
| 2026-05-28 | Fair value gap, bearish structure | -0.45% over 21 days · t = -3.29 · n = 108,591 statistically distinguishable from its control group |
| 2026-05-19 | Fair value gap, bullish structure | -0.67% over 21 days · t = -6.43 · n = 111,973 statistically distinguishable from its control group |
| 2026-05-06 | Equal lows taken out structure | -0.64% over 21 days · t = -4.75 · n = 55,661 statistically distinguishable from its control group |
| 2026-04-23 | Fair value gap, bullish structure | -0.67% over 21 days · t = -6.43 · n = 111,973 statistically distinguishable from its control group |
Excess return against a matched control group, on a point-in-time universe that includes delisted companies. Most families do not survive that. How the measurement works →
Insider transactions (Form 4)
| date | insider | what | shares | price | value |
|---|---|---|---|---|---|
| 2026-08-17 | Narayan Shruthi President | Grant or award | 3.1K | 0.00 | 0 |
| 2026-05-19 | Elsesser Adam CEO | Gift | 77.0K | 0.00 | 0 |
| 2026-04-02 | Grewal Harpreet Director | Open-market sale 10b5-1 plan | 100 | 328.22 | 32.8K |
| 2026-03-15 | Yuen Maggie Chief Financial Officer | Shares withheld for tax | 186 | 336.18 | 62.5K |
| 2026-03-15 | Roberts Johanna EVP, Gen. Counsel & Secretary | Shares withheld for tax | 186 | 336.18 | 62.5K |
| 2026-03-15 | Shiu Lambert Chief Accounting Officer | Shares withheld for tax | 150 | 336.18 | 50.4K |
| 2026-03-15 | Narayan Shruthi President | Shares withheld for tax | 117 | 336.18 | 39.3K |
| 2026-03-02 | Yuen Maggie Chief Financial Officer | Open-market sale 10b5-1 plan | 2.4K | 342.30 | 832.5K |
| 2026-02-17 | Shiu Lambert Chief Accounting Officer | Grant or award | 2.3K | 0.00 | 0 |
| 2026-02-17 | Roberts Johanna EVP, Gen. Counsel & Secretary | Grant or award | 2.6K | 0.00 | 0 |
Open-market purchases (code P) are the informative ones. Grants, option exercises and tax withholding are compensation mechanics, not decisions. How to read a Form 4 →
Largest institutional holders
| manager | value | shares |
|---|---|---|
| BlackRock, Inc. | 1.4B | 4.3M |
| VANGUARD CAPITAL MANAGEMENT LLC | 556.4M | 1.7M |
| VANGUARD PORTFOLIO MANAGEMENT LLC | 543.3M | 1.7M |
| HBK INVESTMENTS L P | 536.6M | 1.6M |
| STATE STREET CORP | 389.4M | 1.2M |
| MILLENNIUM MANAGEMENT LLC | 360.6M | 1.1M |
| BAILLIE GIFFORD & CO | 276.0M | 840.4K |
| GEODE CAPITAL MANAGEMENT, LLC | 261.3M | 795.4K |
| Balyasny Asset Management L.P. | 250.2M | 762.1K |
| GOLDMAN SACHS GROUP INC | 236.6M | 720.6K |
13F positions as of 2026-03-31, filed up to 45 days after quarter end. Long-only US equity — shorts and derivatives never appear. What 13F does and does not show →
Latest SEC filings
| form | filed | period | |
|---|---|---|---|
| SCHEDULE 13G | 2026-08-13 | — | on EDGAR ↗ |
| 10-Q | 2026-07-30 | 2026-06-30 | on EDGAR ↗ |
| 8-K | 2026-07-30 | 2026-07-30 | on EDGAR ↗ |
| 8-K | 2026-06-22 | 2026-06-18 | on EDGAR ↗ |
| SD | 2026-05-29 | — | on EDGAR ↗ |
| 4 | 2026-05-21 | 2026-05-19 | on EDGAR ↗ |
| 425 | 2026-05-07 | — | on EDGAR ↗ |
| 8-K | 2026-05-07 | 2026-05-06 | on EDGAR ↗ |
Short selling
This is off-exchange short volume, not short interest: it is flow, not position, and 40–50% is normal because market makers short to fill your buy. Why that number misleads →
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