Gagnon Advisors is an SEC-registered investment adviser based in New York, NY that reports managing 4 hedge funds on Form ADV. It reports $187.3 million in regulatory assets under management. Its private funds, of all types, hold $307.0 million in gross assets. Its disclosed U.S. stock holdings returned an estimated +1.6% 2026 YTD through Jun 30 (S&P 500: +9.5%), based on 13F filings. Over a longer period they returned an estimated +50.3% from Q3 2024 to Q2 2026, compared with +37.2% for the S&P 500, based on 13F filings.
- Regulatory assets under management
- $187.3 millionForm ADV Item 5.F
- Gross assets of private funds
- $307.0 millionAll private fund types, Form ADV
- Hedge funds managed
- 44 private funds in total
- Employees
- 10Form ADV Item 5.A
- Registration
- SEC-registered adviserCRD 161697
- Latest Form ADV
- 08/12/2026Disciplinary disclosures: yes, see SEC record
Estimated 13F portfolio performance
| Quarter | Est. 13F return | S&P 500 |
|---|---|---|
| Q2 2026 | +17.7% | +14.8% |
| Q1 2026 | -13.7% | -4.6% |
| Q4 2025 | -1.6% | +2.4% |
| Q3 2025 | +9.0% | +7.8% |
| Q2 2025 | +15.7% | +10.4% |
| Q1 2025 | -11.9% | -4.5% |
| Q4 2024 | +13.1% | +2.1% |
| Q3 2024 | +19.7% | +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
- Caredx Inc$15.6 million
- Ameresco Inc$13.0 million
- Enterprise Prods Partners L P Com$12.5 million
- Genedx Holdings Corp CL A$12.2 million
- Equinix Inc$11.2 million
- Hinge Health Inc$9.4 million
- Pacira Biosciences Inc$8.9 million
- Freshworks Inc$7.9 million
- Biolife Solutions, Inc.$7.7 million
- Five9 Inc$7.2 million
As of 2026-06-30, from 13F filing by Gagnon Advisors, 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