HI
Harbor Island Capital LLC 13F Holdings & Recent Stock Buys (Q2 2026)
Harbor Island Capital LLCCIK: 0001730580
Sector-focusedMomentum followerQuality / disciplined sizing
Total reported value
$375.6M
Reporting period: 2026-06-30 · Number of holdings: 16
Harbor Island Capital LLC disclosed 16 holdings in its latest 13F filing for the period ending 2026-06-30, with total reported value of $375.6M and a quarterly turnover rate of 34.4%.
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Personality snowflake
- Concentration
- 39.52
- Portfolio Stability
- 34.39
- Momentum
- 100
- Sector conviction
- 100
- Diversification
- 32
- Sizing Uniformity
- 92.13
Harbor Island Capital LLC's disclosed holdings carry a Herfindahl concentration index of 0.099 — mathematically equivalent to about 10 equally-sized positions, close to its 16 actual disclosed holdings. Value is spread relatively evenly across the portfolio rather than concentrated in a handful of names.
Position sizes are fairly uniform across the portfolio (a coefficient of variation of 0.79), suggesting a disciplined, rules-based approach to how much capital goes into each idea.
Recent activity leans toward adding more aggressively to already-large existing positions than to newly initiated ones (a 5.1 percentage-point tilt) — a pattern consistent with a momentum-following approach.
Source and citation information
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Recent moves
View source Form 13F filing on SEC.govAdd LRCX
-6.8% $30.4M
Add KLAC
+900.0% $21.0M
Trim WBD
-4.5% -$1.9M
Add AMAT
-21.7% $26.5M
Add INTC
0.0% $11.0M
Trim WFC
0.0% $770.2K
Holdings Map
New buyAddUnchangedTrim
* This report is exclusively curated by the AlphaSMO team. AlphaSMO is the web's most authoritative 13F / Inside Trader database, delivering precise insider trading and institutional holdings insights.
Top 10 holdings by weight
Full holdings list this quarter
| # | Ticker | Issuer | Asset Subclass | Weight | Weight Change | Shares Change | 4Q Trend |
|---|---|---|---|---|---|---|---|
| 1 | AMAT | Applied Materials Inc | Stock-Tech | 17.81% | +2.82% | -21.65% | |
| 2 | LRCX | Lam Research CORP | Stock-Tech | 17.18% | +4.50% | -6.83% | |
| 3 | KLAC | Kla CORP | Stock-Tech | 10.92% | +3.48% | +900.00% | |
| 4 | WBD | Warner Bros Discovery Inc | Stock-Comm Services | 6.59% | -3.32% | -4.47% | |
| 5 | CSCO | Cisco Systems Inc | Stock-Tech | 6.44% | +0.50% | — | |
| 6 | AAPL | Apple Inc | Stock-Tech | 6.05% | -1.36% | — | |
| 7 | WFC | Wells Fargo & Co | Stock-Financials | 5.59% | -1.93% | — | |
| 8 | INTC | Intel CORP | Stock-Tech | 4.28% | +2.39% | — | |
| 9 | MSFT | Microsoft CORP | Stock-Tech | 4.05% | -1.25% | +5.97% | |
| 10 | NKE | Nike Inc -cl B | Stock-Consumer Disc | 3.95% | -0.82% | +48.81% | |
| 11 | GATX | Gatx CORP | Stock-Industrials | 3.93% | -1.36% | — | |
| 12 | CMCSA | Comcast Corp-class A | Stock-Comm Services | 3.59% | -1.53% | +14.39% | |
| 13 | EXP | Eagle Materials Inc | Stock-Materials | 3.54% | -0.62% | — | |
| 14 | BAC | Bank Of America CORP | Stock-Financials | 2.21% | -0.43% | — | |
| 15 | VSNT | Versant Media Group Inc | Stock-Comm Services | 2.12% | -0.72% | +7.19% | |
| 16 | HPQ | Hp Inc | Stock-Tech | 1.73% | -0.38% | — |
Portfolio Performance
Performance for Q3 2026
+0.8%
Performance Last 4 Quarters
+68%
- Stdev
- +22.9%
- Beta
- +1.26
- Alpha
- +4.3%
- Max Drawdown
- -13.6%
- Annualized Perf
- +30.6%
- Batting Avg vs S&P
- +50%
- Sortino
- +2.51
- Stutzer
- +0.38
- Treynor
- +0.23
- Sterling
- +1.47
- Calmar
- +2.25
- Information Ratio
- +0.58
- Tracking Error
- +16.4%
- Stdev Down
- +11.8%
- Winning Months %
- +63.9%
- Losing Months %
- +36.1%
- Best 12 Months
- +98.7%
- Worst 12 Months
- -2.8%
- Efficiency Ratio
- +0.6
- Sharpe
- +1.29
- Stdev Sectors
- +23.4%
- Skewness
- -0.12
- Kurtosis
- -0.33
- Upside Potential
- +4.14
Reported value over time
Sector allocation
Sector allocation over time
Quarterly history
| Period | Holdings | Total value | Stability | Top holdings | |
|---|---|---|---|---|---|
| 2026 Q2 | 16 | $375.6M | 34 | ||
| 2026 Q1 | 16 | $269.2M | 13 | ||
| 2025 Q4 | 15 | $260.8M | 15 | ||
| 2025 Q3 | 15 | $233.7M | 20 | ||
| 2025 Q2 | 15 | $213.1M | 0 | ||
| 2025 Q1 | 16 | $201.9M | 100 | ||
| 2024 Q4 | 15 | $209.0M | 0 | ||
| 2024 Q3 | 15 | $211.4M | 0 | ||
| 2024 Q2 | 15 | $232.2M | 0 | ||
| 2024 Q1 | 15 | $218.3M | 0 | ||
| 2023 Q4 | 15 | $201.6M | 0 | ||
| 2023 Q3 | 15 | $173.1M | 0 | ||
| 2023 Q2 | 15 | $187.0M | 0 | ||
| 2023 Q1 | 15 | $182.1M | 0 | ||
| 2022 Q4 | 15 | $157.1M | 0 | ||
| 2022 Q3 | 15 | $143.0M | 0 | ||
| 2022 Q2 | 15 | $163.4M | 0 | ||
| 2022 Q1 | 15 | $208.3M | 0 | ||
| 2021 Q4 | 15 | $225.5M | 0 | ||
| 2021 Q3 | 15 | $189.9M | 0 | ||
| 2021 Q2 | 15 | $201.0M | 100 | ||
| 2021 Q1 | 15 | $192.5M | 23 | ||
| 2020 Q4 | 15 | $155.9M | 26 | ||
| 2020 Q3 | 15 | $124.4M | 8 | ||
| 2020 Q2 | 15 | $119.7M | 24 | ||
| 2020 Q1 | 17 | $103.7M | 32 | ||
| 2019 Q4 | 17 | $133.5M | 12 | ||
| 2019 Q3 | 17 | $118.7M | 12 | ||
| 2019 Q2 | 17 | $110.9M | 12 | ||
| 2019 Q1 | 17 | $106.7M | 24 | ||
| 2018 Q4 | 18 | $97.1M | 19 | ||
| 2018 Q3 | 19 | $114.0M | 21 | ||
| 2018 Q2 | 17 | $110.5M | 7 | ||
| 2018 Q1 | 17 | $112.2M | 11 | ||
| 2017 Q4 | 17 | $112.6M | — |
Holding changes this quarter
Harbor Island Capital LLC's most significant position changes for 2026-06-30: Trim: Lam Research CORP (LRCX) — shares -6.83%; Add: Kla CORP (KLAC) — shares +900.00%; Trim: Warner Bros Discovery Inc (WBD) — shares -4.47%; Trim: Applied Materials Inc (AMAT) — shares -21.65%; Add: Comcast Corp-class A (CMCSA) — shares +14.39%.
| # | Ticker | Issuer | Weight Change | Shares Change | Action |
|---|---|---|---|---|---|
| 1 | LRCX | Lam Research CORP | +4.5% | -6.83% | Trim |
| 2 | KLAC | Kla CORP | +3.5% | +900.00% | Add |
| 3 | AMAT | Applied Materials Inc | +2.8% | -21.65% | Trim |
| 4 | INTC | Intel CORP | +2.4% | — | Unchanged |
| 5 | CSCO | Cisco Systems Inc | +0.5% | — | Unchanged |
| 6 | HPQ | Hp Inc | -0.4% | — | Unchanged |
| 7 | BAC | Bank Of America CORP | -0.4% | — | Unchanged |
| 8 | EXP | Eagle Materials Inc | -0.6% | — | Unchanged |
| 9 | VSNT | Versant Media Group Inc | -0.7% | +7.19% | Add |
| 10 | NKE | Nike Inc -cl B | -0.8% | +48.81% | Add |
| 11 | MSFT | Microsoft CORP | -1.3% | +5.97% | Add |
| 12 | AAPL | Apple Inc | -1.4% | — | Unchanged |
| 13 | GATX | Gatx CORP | -1.4% | — | Unchanged |
| 14 | CMCSA | Comcast Corp-class A | -1.5% | +14.39% | Add |
| 15 | WFC | Wells Fargo & Co | -1.9% | — | Unchanged |
| 16 | WBD | Warner Bros Discovery Inc | -3.3% | -4.47% | Trim |
Filing History
FAQ
What is Harbor Island Capital LLC and what type of investor is it?
Harbor Island Capital LLC is an investment manager that files SEC Form 13F quarterly, disclosing its U.S. public equity holdings to regulators. As of the most recent reporting period (2026-06-30), the firm manages a tracked equity portfolio valued at approximately $375.6M, spread across 16 disclosed positions.
What are Harbor Island Capital LLC's largest equity positions?
Based on the latest 13F filing, Harbor Island Capital LLC's top holdings by market value are:
1. Applied Materials Inc (AMAT) — $66.9M (17.8%)
2. Lam Research CORP (LRCX) — $64.5M (17.2%)
3. Kla CORP (KLAC) — $41.0M (10.9%)
4. Warner Bros Discovery Inc (WBD) — $24.7M (6.6%)
5. Cisco Systems Inc (CSCO) — $24.2M (6.4%)
What changes did Harbor Island Capital LLC make in its most recent portfolio filing?
In the latest reported quarter, Harbor Island Capital LLC made 8 notable position adjustments: 0 new positions were initiated, 5 existing holdings were added to, 3 positions were partially reduced, and 0 were completely exited. The largest of these moves: Trim: Lam Research CORP (LRCX) — shares -6.83%; Add: Kla CORP (KLAC) — shares +900.00%; Trim: Warner Bros Discovery Inc (WBD) — shares -4.47%; Trim: Applied Materials Inc (AMAT) — shares -21.65%; Add: Comcast Corp-class A (CMCSA) — shares +14.39%
What sectors does Harbor Island Capital LLC focus on?
Harbor Island Capital LLC is concentrated in the following sectors based on its current disclosed equity portfolio:
• Information Technology: 68.5%
• Communication Services: 12.3%
• Financials: 7.8%
• Consumer Discretionary: 4.0%
• Industrials: 3.9%
• Materials: 3.5%
Investment Profile
Harbor Island Capital LLC returned an annualized 30.6% over the trailing 36 months — outperforming the S&P 500 by 4.3 points — based on a reconstructed track record of its disclosed 13F positions, with a beta of 1.26 (more volatile than the market) and a 50% quarterly batting average against the index.
Its portfolio is moderately concentrated and moderately active, with 68.5% of the portfolio concentrated in Information Technology.
Its turnover score has risen from 0 to 34 over the past 4 quarters — a shift toward more active trading.
It has added to its AMAT position over the past two quarters (+$33.6M, now $66.9M), while trimming WBD over the same stretch (-$3.5M, still holding $24.7M).
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Developer Access
Access Harbor Island Capital LLC's institutional profile programmatically:
REST API
curl https://alphasmo.com/api/v1/institutions/harbor-island-capital-llcCLI
npx alphasmo institutions get harbor-island-capital-llc