Barton Investment Management portfolio
Concentrated managerType not verifiedPortfolio as of Sep 30, 2026 (Q3 2026) · filed with the SEC on Oct 27, 2026 · data updated on Nov 5, 2026 · Q3 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.
Barton Investment Management reported a $807M portfolio of 56 companies (58 positions, counting each share class separately) to the SEC as of the end of Q3 2026. Its largest positions are SHOP, NFLX, AMZN. During the quarter it exited Electronic Arts.
Sections with a free account
What changed this quarter
32 positions with a change (1 new, 8 added to, 20 trimmed, 3 sold). 3 are listed here: those of 0.5 points of the portfolio or more (up to 12).
- Shopify−5.0%fewer sharesReduced24.4% → 27.6%
- Electronic Arts−1.1 ppof portfolioSold out1.2% → —
- Gitlab+19%more sharesIncreased2.0% → 3.4%
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
- ShopifySHOP27.6%
- NetflixNFLX19.5%
- Amazon.comAMZN14.7%
- OktaOKTA5.3%
- Global-E OnlineGLBE5.0%
- EquinixEQIX3.9%
- GitlabGTLB3.4%
- KlaviyoKVYO2.6%
- Blue OWL CapitalOWL2.4%
- GFL EnvironmentalGFL2.1%
- MicrosoftMSFT1.6%
- Berkshire HathawayBRK/A1.6%
- American TowerAMT1.5%
- AlphabetGOOGL · GOOG1.3%
- AppleAAPL1.0%
“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
- ● Information Technology 48%
- ● Communication Services 21%
- ● Consumer Discretionary 15%
- ● Real Estate 5%
- ● Financials 4%
- ● Industrials 3%
- ● No sector 2%
- ● Health Care 2%
How its portfolio changed (8 quarters)
Q3 2026: 58
Q3 2026: 86%
Q3 2026: 3.0%
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.
- Suncoast Equity Management$806M
- Nexus Investment Management ULC$808M
- Think InvestmentsInvestment firm · $811M
- Newtyn ManagementInvestment firm · $801M
- Tri Locum PartnersInvestment firm · $813M
- Quantum Capital ManagementInvestment firm · $798M