Penbrook Management LLC holds a focused book of 101 stocks worth $156.8M as of Q2 2026 (disclosed Jul 23, 2026, a ~45-day 13F lag). This quarter they opened Seabridge Gold Inc and trimmed Microsoft Corp. Their largest long position is Novo-Nordisk A/s-Spons ADR at 10% of the equity book. Cloning the disclosed picks since 2025 would be +26% (+16.7%/yr). That is a simulation of the disclosed long book, not audited returns.
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curl -H "Authorization: Bearer YOUR_API_KEY" \ "https://arkolith.com/api/v1/funds/1381055/holdings"
Use Arkolith to show Penbrook Management LLC's latest holdings, largest changes, and filing provenance.
Following at the filing date actually beat the quarter-end book by 7.6 points over this window.
Growth of $10,000 cloning Penbrook Management LLC's disclosed long 13F book, rebalanced on each filing date (so it reflects the ~45-day reporting lag, no look-ahead), total-return basis (dividends reinvested), derived from end-of-day prices. “Their reported book” values the same picks from quarter-end, before they were public. S&P 500 is SPY total return over the same window. Excludes shorts, cash, options and non-13F holdings. Not investment advice.
Top-heavy: focused book
Share of the disclosed book in its largest positions. A higher top-5 share means a more concentrated, higher-conviction portfolio.
94% mapped to company sectors
Direct operating-company sectors from our SIC-based security master. ETF/fund and unclassified holdings stay visible separately; this is not ETF look-through exposure.
Estimated $ traded · quarter-end prices, no cost basis
Bars show each stock's share of the portfolio. Click a row for its position history.
| # | Security | Value | Shares | % Port | Last move | History |
|---|---|---|---|---|---|---|
| 1 | Novo-Nordisk A S ADR ADR | $15.2M | 316.2K | 9.7% | —Held | |
| 2 | Amazon Com Inc Stock | $12.3M | 51.8K | 7.9% | —Held | |
| 3 | Alphabet Inc Cap STK CL A Stock | $8.3M | 23.2K | 5.3% | —Held | |
| 4 | Microsoft Corp Stock | $8.2M | 21.9K | 5.2% | ▼−1.5% Reduced · −325 sh | |
| 5 | Alphabet Inc Cap STK CL C Stock | $8.0M | 22.6K | 5.1% | —Held | |
| 6 | Moodys Corp Stock | $6.2M | 13.6K | 3.9% | —Held | |
| 7 | Electrovaya Inc Stock | $3.4M | 326.2K | 2.2% | ▲+10% Added · +31K sh | |
| 8 | Cryoport Inc Com Par $0.001 Stock | $3.2M | 202.7K | 2.0% | ▲+9.1% Added · +17K sh | |
| 9 | Viemed Healthcare Inc Stock | $3.2M | 277.2K | 2.0% | ▲+1.8% Added · +5K sh | |
| 10 | Marvell Technology Inc Stock | $2.9M | 9.7K | 1.8% | —Held | |
| 11 | Photronics Inc Stock | $2.9M | 89.1K | 1.8% | ▼−7.9% Reduced · −8K sh | |
| 12 | Seabridge Gold Inc Stock | $2.9M | 110.9K | 1.8% | ▲New New position | |
| 13 | Extreme Networks Inc Stock | $2.7M | 84.0K | 1.7% | ▲+0.6% Added · +500 sh | |
| 14 | Planet Labs PBC Com CL A Stock | $2.7M | 81.8K | 1.7% | ▼−23% Reduced · −24K sh | |
| 15 | Prothena Corp PLC SHS Stock | $2.7M | 271.7K | 1.7% | —Held | |
| 16 | Alkami Technology Inc Stock | $2.5M | 140.6K | 1.6% | ▲+10% Added · +13K sh | |
| 17 | Allot Ltd SHS Stock | $2.4M | 275.3K | 1.6% | ▲New New position | |
| 18 | Cisco Sys Inc Stock | $2.2M | 18.4K | 1.4% | —Held | |
| 19 | Blackstone Inc Stock | $2.1M | 18.1K | 1.4% | —Held | |
| 20 | Magnite Inc Stock | $2.1M | 112.0K | 1.4% | ▼−0.1% Reduced · −150 sh | |
| 21 | Axcelis Technologies Inc Stock | $2.1M | 10.9K | 1.3% | ▼−9.9% Reduced · −1K sh | |
| 22 | Curiositystream Inc Com CL A Stock | $2.0M | 764.8K | 1.3% | ▲+13% Added · +90K sh | |
| 23 | Thomson Reuters Corp Stock | $2.0M | 24.4K | 1.3% | ▲New New position | |
| 24 | Nuveen N Y Mun Value FD CEF | $1.9M | 213.7K | 1.2% | —Held | |
| 25 | Vermilion Energy Inc Stock | $1.9M | 197.8K | 1.2% | —Held | |
| 26 | Targa Res Corp Stock | $1.8M | 6.9K | 1.2% | —Held | |
| 27 | Berkshire Hathaway Inc Del CL B New Stock | $1.6M | 3.3K | 1.1% | ▼−0.3% Reduced · −10 sh | |
| 28 | Baytex Energy Corp Stock | $1.6M | 399.4K | 1.0% | ▲New New position | |
| 29 | Energy Transfer L P Com Ut Ltd PTN Stock | $1.4M | 74.5K | 0.9% | —Held | |
| 30 | Williams Cos Inc Stock | $1.4M | 19.1K | 0.9% | —Held | |
| 31 | Automatic Data Processing Inc Stock | $1.4M | 6.3K | 0.9% | —Held | |
| 32 | Data I O Corp Stock | $1.4M | 355.9K | 0.9% | ▼−0.3% Reduced · −1K sh | |
| 33 | Sony Group Corp Sponsored ADR ADR | $1.4M | 68.5K | 0.9% | —Held | |
| 34 | Abbvie Inc Stock | $1.3M | 5.2K | 0.8% | ▼−0.3% Reduced · −18 sh | |
| 35 | Verizon Communications Inc Stock | $1.3M | 30.4K | 0.8% | ▲+1.8% Added · +525 sh | |
| 36 | Airbnb Inc Com CL A Stock | $1.3M | 8.9K | 0.8% | —Held | |
| 37 | State Street SPDR S&P 500 ETF ETF | $1.2M | 1.6K | 0.8% | —Held | |
| 38 | Mesoblast Ltd Spons ADR ADR | $1.2M | 87.1K | 0.8% | —Held | |
| 39 | Hess Midstream LP CL A SHS Stock | $1.1M | 30.1K | 0.7% | —Held | |
| 40 | Biolife Solutions Inc Stock | $1.1M | 39.7K | 0.7% | ▲+71% Added · +17K sh | |
| 41 | Doubleverify Hldgs Inc Stock | $1.1M | 102.7K | 0.7% | ▼−0.2% Reduced · −250 sh | |
| 42 | USA Compression Partners LP Com Unit Ltdpar Stock | $1.1M | 41.0K | 0.7% | —Held | |
| 43 | NPK International Inc Com SHS Stock | $1.1M | 67.8K | 0.7% | ▲+0.8% Added · +575 sh | |
| 44 | Nvidia Corporation Stock | $1.1M | 5.3K | 0.7% | ▲+1.9% Added · +100 sh | |
| 45 | Oneok Inc Stock | $983K | 11.3K | 0.6% | —Held | |
| 46 | Meta Platforms Inc CL A Stock | $958K | 1.7K | 0.6% | —Held | |
| 47 | Kulicke & Soffa Inds Inc Stock | $950K | 7.1K | 0.6% | —Held | |
| 48 | Par Technology Corp Stock | $936K | 53.8K | 0.6% | ▲+50% Added · +18K sh | |
| 49 | Popular Inc Com New Stock | $870K | 5.3K | 0.6% | ▼−3.6% Reduced · −200 sh | |
| 50 | Novartis AG Sponsored ADR ADR | $868K | 5.5K | 0.6% | —Held |
As-of date vs the date the SEC received each filing
| Quarter | As of | Filed | Positions | Value | Form |
|---|---|---|---|---|---|
| Q2 2026 | Jun 30, 2026 | Jul 23, 2026 | 101 | $156.8M | 13F-HR |
| Q1 2026 | Mar 31, 2026 | Apr 21, 2026 | 93 | $132.1M | 13F-HR |
| Q4 2025 | Dec 31, 2025 | Jan 6, 2026 | 97 | $145.0M | 13F-HR |
| Q3 2025 | Sep 30, 2025 | Oct 22, 2025 | 104 | $143.2M | 13F-HR |
| Q2 2025 | Jun 30, 2025 | Jul 28, 2025 | 102 | $133.0M | 13F-HR/A |
| Q1 2025 | Mar 31, 2025 | Apr 1, 2025 | 107 | $132.3M | 13F-HR |
| Q4 2024 | Dec 31, 2024 | Jan 23, 2025 | 110 | $146.6M | 13F-HR |
Holdings from SEC EDGAR 13F-HR filings, updated quarterly ~45 days after quarter-end. Public domain. The book and weighting are long equity only; disclosed put/call options are listed separately and excluded from those totals. The performance line is a simulation of the disclosed long book, not an audited return.