Penbrook Management LLC is an SEC-registered investment adviser based in New York, NY that reports managing 1 hedge fund on Form ADV. It reports $175.4 million in regulatory assets under management. Its private funds, of all types, hold $9.3 million in gross assets. Its disclosed U.S. stock holdings returned an estimated +13.7% 2026 YTD through Jun 30 (S&P 500: +9.5%), based on 13F filings. Over a longer period they returned an estimated +12.8% from Q3 2024 to Q2 2026, compared with +37.2% for the S&P 500, based on 13F filings.
- Regulatory assets under management
- $175.4 millionForm ADV Item 5.F
- Gross assets of private funds
- $9.3 millionAll private fund types, Form ADV
- Hedge funds managed
- 11 private funds in total
- Employees
- 4Form ADV Item 5.A
- Registration
- SEC-registered adviserCRD 127269
- Latest Form ADV
- 05/28/2026Disciplinary disclosures: yes, see SEC record
Estimated 13F portfolio performance
| Quarter | Est. 13F return | S&P 500 |
|---|---|---|
| Q2 2026 | +18.8% | +14.8% |
| Q1 2026 | -4.2% | -4.6% |
| Q4 2025 | +2.3% | +2.4% |
| Q3 2025 | +3.9% | +7.8% |
| Q2 2025 | +9.2% | +10.4% |
| Q1 2025 | -8.1% | -4.5% |
| Q4 2024 | -3.9% | +2.1% |
| Q3 2024 | -3.3% | +5.4% |
Estimate of the firm's disclosed long U.S. stock portfolio from its quarterly 13F filings, holding each quarter-end portfolio to the next quarter-end at prices implied by all 13F filers. It is a price return before dividends and fees, ignores shorts, options, bonds, cash and trading within the quarter, and is not the return of any fund. Disclosures
Largest disclosed holdings
- Novo-nordisk A S ADR$15.2 million
- Amazon Com Inc Com$12.3 million
- Alphabet, Inc Voting Class$8.3 million
- Microsoft Corp Com$8.2 million
- Alphabet, Inc Non-voting Class$8.0 million
- Moodys Corp$6.2 million
- Electrovaya Inc$3.4 million
- Cryoport Inc$3.2 million
- Viemed Healthcare Inc$3.2 million
- Marvell Technology Inc Com$2.9 million
As of 2026-06-30, from 13F filing by Penbrook Management LLC.
From SEC filings. Firm data comes from the SEC's Form ADV data as of Oct 2, 2026; performance estimates come from Form 13F. HedgeMountain has not verified this information, and it is not an offer, solicitation or recommendation. Full disclosures