Harbor Island Capital portfolio
Concentrated managerType not verifiedPortfolio as of Sep 30, 2026 (Q3 2026) · filed with the SEC on Oct 23, 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.
Harbor Island Capital reported a $276M portfolio of 16 positions to the SEC as of the end of Q3 2026. Its largest positions are LRCX, AMAT, AAPL.
Sections with a free account
What changed this quarter
15 positions with a change (15 trimmed). 11 are listed here: those of 0.5 points of the portfolio or more (up to 12).
- Warner Bros. Discovery−33%fewer sharesReduced6.6% → 6.9%
- Lam Research−14%fewer sharesReduced17.2% → 15.2%
- Applied Materials−13%fewer sharesReduced17.8% → 14.8%
- KLA−16%fewer sharesReduced10.9% → 8.1%
- Apple−14%fewer sharesReduced6.1% → 8.1%
- Microsoft−17%fewer sharesReduced4.1% → 6.3%
- Cisco Systems−16%fewer sharesReduced6.4% → 6.8%
- Intel−21%fewer sharesReduced4.3% → 3.9%
- Wells Fargo−14%fewer sharesReduced5.6% → 6.4%
- Gatx−17%fewer sharesReduced3.9% → 4.2%
- Comcast−20%fewer sharesReduced3.6% → 3.5%
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
- Lam ResearchLRCX15.2%
- Applied MaterialsAMAT14.8%
- AppleAAPL8.1%
- KLAKLAC8.1%
- Warner Bros. DiscoveryWBD6.9%
- Cisco SystemsCSCO6.8%
- Wells FargoWFC6.4%
- MicrosoftMSFT6.3%
- NikeNKE4.6%
- GATXGATX4.2%
- IntelINTC3.9%
- ComcastCMCSA3.5%
- Eagle MaterialsEXP3.3%
- HPHPQ2.9%
- Bank of AmericaBAC2.7%
“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 66%
- ● Communication Services 13%
- ● Financials 9%
- ● Consumer Discretionary 5%
- ● Industrials 4%
- ● Materials 3%
How its portfolio changed (8 quarters)
Q3 2026: 16
Q3 2026: 81%
Q3 2026: 6.9%
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
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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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