PEN · Insider trading · 13F holders · Congress trades
Penumbra Inc (PEN)
Who is buying and selling PEN: company insiders on SEC Form 4, hedge funds and superinvestors on Form 13F, and members of Congress under the STOCK Act. Every figure links to the filing or page it comes from.
- 13F filers holding
- 56
- Insider buys, 90 days
- $0
- Insider sales, 90 days
- $0
- Congress trades, 12 months
- 1
PEN at a glance
- No open-market insider purchases or sales of PEN were filed in the last 90 days.
- 56 13F filers hold PEN among their 50 largest positions, worth $2.9B combined, including Michael Gelband, Alec Litowitz, Dmitry Balyasny and Paul Tudor Jones. The biggest bets by portfolio weight are Slotnik Capital, LLC (11.7%), Decagon Asset Management LLP (8.9%) and Birnam Oak Advisors, LP (8.8%). In their latest 13Fs, 2 managers opened a new position and 24 added to one.
- Members of Congress have disclosed 1 PEN trade since 2025, 0 purchases and 1 sale in the past year; the latest was Lisa C. McClain (R-MI), selling $1K–15K on Jul 10, 2025.
- PEN last closed at $319.98 on Oct 30, 2026.
PEN insider trading
No open-market insider purchases or sales of PEN were filed in the last 90 days.
Who owns PEN? Hedge funds and superinvestors
56 13F filers hold PEN among their 50 largest positions, worth $2.9B combined, including Michael Gelband, Alec Litowitz, Dmitry Balyasny and Paul Tudor Jones. The biggest bets by portfolio weight are Slotnik Capital, LLC (11.7%), Decagon Asset Management LLP (8.9%) and Birnam Oak Advisors, LP (8.8%). In their latest 13Fs, 2 managers opened a new position and 24 added to one.
Superinvestors holding PEN: Michael Gelband 3.2% · Alec Litowitz 0.8% · Dmitry Balyasny 0.7% · Paul Tudor Jones 0.5%
| Manager | % of portfolio | Value | Shares | Last quarter | 13F |
|---|---|---|---|---|---|
| Hbk Investments L PHedge fund | 7.4% | $580.5M | 1,838,508 | +12.5% shares | Q2 2026 |
| Michael GelbandHedge fund | 3.2% | $344.3M | 1,090,430 | +134.4% shares | Q2 2026 |
| Dmitry BalyasnyHedge fund | 0.7% | $344.2M | 1,090,163 | +43.0% shares | Q2 2026 |
| AQR Arbitrage LLCHedge fund | 3.0% | $178.0M | 563,873 | +33.3% shares | Q2 2026 |
| Whitebox Advisors LLCHedge fund | 7.8% | $160.0M | 506,881 | +13.9% shares | Q2 2026 |
| Paul Tudor JonesInvestment manager | 0.5% | $126.5M | 400,649 | -2.5% shares | Q2 2026 |
| Alec LitowitzHedge fund | 0.8% | $80.8M | 255,841 | +1.8% shares | Q2 2026 |
| Champlain Investment Partners, LLCMutual fund manager | 1.8% | $69.2M | 219,032 | -55.4% shares | Q2 2026 |
| TIG Advisors, LLCHedge fund | 3.1% | $67.9M | 215,082 | +258.0% shares | Q2 2026 |
| LMR Partners LLPHedge fund | 0.6% | $67.5M | 213,893 | -27.7% shares | Q2 2026 |
| Alpine Associates Management Inc.Hedge fund | 3.7% | $59.7M | 188,986 | +43.2% shares | Q2 2026 |
| Melqart Asset Management (UK) LtdHedge fund | 5.6% | $58.6M | 185,734 | +127.0% shares | Q2 2026 |
| Caxton Associates LLPHedge fund | 1.1% | $56.6M | 179,384 | -2.9% shares | Q2 2026 |
| Birnam Oak Advisors, LPHedge fund | 8.8% | $54.1M | 171,277 | +78.4% shares | Q2 2026 |
| Glazer Capital, LLCHedge fund | 1.3% | $49.9M | 158,127 | +66.8% shares | Q2 2026 |
| Westchester Capital Management, LLCWealth manager | 2.5% | $49.7M | 157,472 | +105.5% shares | Q2 2026 |
| Water Island Capital LLCMutual fund manager | 5.2% | $47.5M | 150,456 | +25.3% shares | Q2 2026 |
| Verition Fund Management LLCHedge fund | 0.3% | $44.9M | 142,309 | — | Q2 2026 |
| Decagon Asset Management LLPAsset manager | 8.9% | $44.8M | 142,001 | -15.3% shares | Q2 2026 |
| Slotnik Capital, LLCHedge fund | 11.7% | $42.0M | 133,000 | +31.7% shares | Q2 2026 |
| Rock Springs Capital Management LPHedge fund | 1.8% | $36.5M | 115,750 | -3.9% shares | Q2 2026 |
| Kryger Capital LLCHedge fund | 1.9% | $33.9M | 107,207 | -30.3% shares | Q2 2026 |
| Empyrean Capital Partners, LPHedge fund | 1.0% | $26.8M | 85,000 | +0.0% shares | Q2 2026 |
| Capula Management LtdHedge fund | 0.1% | $26.2M | 83,000 | -18.5% shares | Q2 2026 |
| Carret Asset Management, LLCInstitutional asset manager | 2.0% | $22.7M | 72,000 | +0.0% shares | Q2 2026 |
| C WorldWide Group Holding A/SInvestment manager | 0.5% | $22.7M | 72,000 | +0.0% shares | Q2 2026 |
| Quarry LPHedge fund | 3.3% | $20.6M | 65,227 | +65.8% shares | Q2 2026 |
| PFM Health Sciences, LPHedge fund | 1.7% | $19.0M | 60,221 | -56.9% shares | Q2 2026 |
| Harvest Management LLCInvestment manager | 8.1% | $18.2M | 57,487 | +219.4% shares | Q2 2026 |
| GABELLI & Co INVESTMENT ADVISERS, INC.Hedge fund | 2.4% | $16.8M | 53,292 | +3.1% shares | Q2 2026 |
The 30 largest of 56 positions, by value. Each manager counts with its latest 13F (Q3 2026: 5, Q2 2026: 49, Q1 2026: 2). Screen PEN in the grand portfolio →
PEN stock trades by members of Congress
Members of Congress have disclosed 1 PEN trade since 2025, 0 purchases and 1 sale in the past year; the latest was Lisa C. McClain (R-MI), selling $1K–15K on Jul 10, 2025.
| Filed | Member | Trade | Amount | Traded | Since |
|---|---|---|---|---|---|
| Aug 13, 2025 | Lisa C. McClainR-MI · House | Sale | $1K–15K | Jul 10, 2025 | +31.2% |
PEN questions and answers
Are insiders buying PEN stock?
No open-market insider purchases or sales of PEN were filed in the last 90 days.
Which hedge funds own PEN?
56 13F filers hold PEN among their 50 largest positions, worth $2.9B combined, including Michael Gelband, Alec Litowitz, Dmitry Balyasny and Paul Tudor Jones. The biggest bets by portfolio weight are Slotnik Capital, LLC (11.7%), Decagon Asset Management LLP (8.9%) and Birnam Oak Advisors, LP (8.8%). In their latest 13Fs, 2 managers opened a new position and 24 added to one.
Has Congress traded PEN?
Members of Congress have disclosed 1 PEN trade since 2025, 0 purchases and 1 sale in the past year; the latest was Lisa C. McClain (R-MI), selling $1K–15K on Jul 10, 2025.
Who is the largest holder of PEN?
Among 13F filers, Hbk Investments L P reports the largest PEN position, $580.5M (1,838,508 shares) in its Q2 2026 13F. The biggest bet by portfolio weight is Slotnik Capital, LLC's: 11.7% of its portfolio.
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