Gagnon Securities portfolio
Concentrated managerType not verifiedPortfolio as of Jun 30, 2026 (Q2 2026) · filed with the SEC on Aug 5, 2026 · data updated on Nov 5, 2026 · Q2 2026 13F (filing) ↗ · all its 13F filings ↗
A 13F shows the portfolio at quarter-end and is filed up to 45 days later: these are not real-time positions and they may have changed.
Gagnon Securities reported a $519M portfolio of 82 companies (83 positions, counting each share class separately) to the SEC as of the end of Q2 2026. Its largest positions are CDNA, WGS, ENSG. During the quarter it opened Gambling.com Group and exited Navigator Holdings and iShares 0-3 Month Treasury B ETF.
Sections with a free account
What it reported after the quarter end (Q2 2026)
The 13F shows the portfolio as of Jun 30, 2026. Since then Gagnon Securities has filed these own trades with the SEC (Form 4, when it owns more than 10% of a company or holds a role in it) and stakes above 5% (13D and 13G). It is not everything it did: only what it must report before the next 13F.
What changed this quarter
62 positions with a change (4 new, 19 added to, 33 trimmed, 6 sold). 11 are listed here: those of 0.5 points of the portfolio or more (up to 12).
- Navigator Holdings−3.3 ppof portfolioSold out4.0% → —
- GeneDx Holdings+73%more sharesIncreased4.5% → 6.9%
- Gambling.com Group+2.3 ppof portfolioNew— → 2.3%
- Quidelortho+155%more sharesIncreased1.5% → 3.5%
- iShares 0-3 Month Treasury B ETF−1.8 ppof portfolioSold out2.2% → —
- Treace Medical Concepts−42%fewer sharesReduced1.6% → 2.3%
- Hinge Health+47%more sharesIncreased1.1% → 2.9%
- Alpha and Omega Semiconductor−0.7 ppof portfolioSold out0.9% → —
- Vertex+63%more sharesIncreased1.3% → 1.7%
- CarGurus+35%more sharesIncreased2.1% → 2.4%
- Patterson-UTI Energy−94%fewer sharesReduced0.8% → under 0.1%
The figure on the right: for positions added to or trimmed, the change in the number of shares (%); for new and sold ones, the points of the portfolio moved (pp). Below, the portfolio weight before → after. Traded weight: what it bought or sold, excluding price effects.
Top holdings
- CaredxCDNA9.7%
- GeneDx HoldingsWGS6.9%
- Ensign GroupENSG5.4%
- AmerescoAMRC4.4%
- Generac HoldingsGNRC4.1%
- Enterprise Products PartnersEPD3.6%
- QuidelorthoQDEL3.5%
- Cheesecake FactoryCAKE3.4%
- EquinixEQIX3.4%
- CarmaxKMX3.3%
- FreshworksFRSH3.1%
- Pacira BiosciencesPCRX3.0%
- Five9FIVN3.0%
- Hinge HealthHNGE2.9%
- BioLife SolutionsBLFS2.9%
“Since”: first quarter of the current run, unbroken until today. In the details, prices are the quarter-end prices of the quarters in which it added shares, per the 13F. The manager may have bought at any price within each quarter; the SEC only publishes the value at quarter end.
Portfolio by sector
- ● Health Care 46%
- ● Information Technology 16%
- ● Industrials 12%
- ● Consumer Discretionary 10%
- ● Real Estate 5%
- ● Energy 4%
- ● No sector 3%
- ● Communication Services 3%
- ● Financials 1%
How its portfolio changed (8 quarters)
Q2 2026: 83
Q2 2026: 48%
Q2 2026: 10.6%
Traded turnover: the weight it bought plus the weight it sold in the quarter, divided by two, excluding price moves. The plain “turnover” in the header does include that effect. With a free account: the full history and sectors over time.
Stakes above 5% (13D/13G)
Companies where this filer reported holding 5% or more of the shares. It is the figure from its latest filing on each one; history since December 2024.
How we classify it
Type not verified. It meets the portfolio criteria of a concentrated manager, but its type is not verified: we found no official document that is enough to say what kind of entity it is. It may be an investment firm, but also an adviser adding up client accounts, a bank or a family vehicle. It counts in the tallies like the rest; keep that in mind when reading it. How the type is assigned
Managers of a similar size
A 13F portfolio value between a third and three times this one, whatever the type of filer. It is not a comparison of what they hold.
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