Q3 2026 13F · SEC CIK 1730580
Harbor Island Capital LLC
Wealth managerFiled 2026-10-23 for Q3 2026. Open the filing ↗ · All SEC filings ↗
- Reported 13F value
- $276.5M
- Reported positions
- 16
- Top holdings a year, 3 yrs
- +31.1%
- Assets under management
- $277.6M
Harbor Island Capital LLC is a wealth manager that reported 16 positions worth $276.5M in its Q3 2026 13F, filed 2026-10-23. Its largest holdings were Lam Research Corp (LRCX, 15.2%), Applied Matls Inc (AMAT, 14.8%), Apple Inc (AAPL, 8.1%). A portfolio copying its top holdings returned 31.1% a year over the last 3 years, against 20.4% for the S&P 500.
Harbor Island Capital LLC holdings all 16 positions.
Weights are shares of the filer's total reported 13F value, compared with Q2 2026. Share changes may reflect splits; weight changes also reflect price moves. A 13F shows long US-listed positions only, up to 135 days after the fact.
| Stock | % of 13F value | Share change | Reported value |
|---|---|---|---|
| LRCXLam Research Corp | 15.2% | -13.9% | $42.1M |
| AMATApplied Matls Inc | 14.8% | -13.3% | $41.0M |
| AAPLApple Inc | 8.1% | -14.3% | $22.4M |
| KLACKla Corp | 8.1% | -15.5% | $22.4M |
| WBDWarner Bros Discovery Inc | 6.9% | -33.3% | $19.1M |
| CSCOCisco Sys Inc | 6.8% | -15.7% | $18.7M |
| WFCWells Fargo & Co | 6.4% | -13.6% | $17.6M |
| MSFTMicrosoft Corp | 6.3% | -17.1% | $17.4M |
| NKENike Inc | 4.6% | -0.6% | $12.7M |
| GATXGatx Corp | 4.2% | -17.3% | $11.7M |
| INTCIntel Corp | 3.9% | -21.2% | $10.9M |
| CMCSAComcast Corp New | 3.5% | -19.7% | $9.6M |
| EXPEagle Matls Inc | 3.3% | -8.5% | $9.3M |
| HPQHp Inc | 2.9% | -14.6% | $7.9M |
| BACBank of Amer Corp | 2.7% | -5.1% | $7.5M |
| VSNTVVersant Media Group Inc | 2.2% | -12.7% | $6.1M |
What Harbor Island Capital LLC bought and sold in Q3 2026, against Q2 2026.
New positions
No new positions among the largest holdings.
Added to
No position grew by more than 5%.
Reduced
- WBD Warner Bros Discovery Inc-33.3% shares
- INTC Intel Corp-21.2% shares
- CMCSA Comcast Corp New-19.7% shares
- GATX Gatx Corp-17.3% shares
- MSFT Microsoft Corp-17.1% shares
- CSCO Cisco Sys Inc-15.7% shares
- KLAC Kla Corp-15.5% shares
- HPQ Hp Inc-14.6% shares
Sold out
Nothing sold out.
Share counts compared with the Q2 2026 13F; a split also changes share counts.
How the holdings did against the S&P 500.
- 1 year
- +75.3% /yr
- S&P 500 +20.1%
- 3 years
- +31.1% /yr
- S&P 500 +20.4%
- 5 years
- +18.6% /yr
- S&P 500 +11.6%
A portfolio of the filer's 20 largest 13F positions, weighted by value, bought the trading day after each 13F was filed and held until the next one was: what copying this filer could have earned. 13Fs show long US-listed positions only, so this is an estimate of the stock picks, not the fund's reported returns.
Reported 13F value by quarter.
| Quarter | 13F value | Positions |
|---|---|---|
| Q3 2026 | $276.5M | 16 |
| Q2 2026 | $375.6M | 16 |
| Q1 2026 | $269.2M | 16 |
| Q4 2025 | $260.8M | 15 |
| Q3 2025 | $233.7M | 15 |
| Q2 2025 | $213.1M | 15 |
| Q1 2025 | $201.9M | 16 |
| Q4 2024 | $209.0M | 15 |
| Q3 2024 | $211.4M | 15 |
| Q2 2024 | $232.2M | 15 |
| Q1 2024 | $218.3M | 15 |
| Q4 2023 | $201.6M | 15 |
Questions about Harbor Island Capital LLC's portfolio
What stocks does Harbor Island Capital LLC own?
Harbor Island Capital LLC's latest 13F, for Q3 2026 and filed Oct 23, 2026, lists 16 positions worth $276.5M. The largest are Lam Research Corp (LRCX) at 15.2%, Applied Matls Inc (AMAT) at 14.8%, Apple Inc (AAPL) at 8.1%, Kla Corp (KLAC) at 8.1% and Warner Bros Discovery Inc (WBD) at 6.9%.
What did Harbor Island Capital LLC buy last quarter?
Harbor Island Capital LLC opened no new positions and grew none by more than 5% among its largest holdings in Q3 2026.
What did Harbor Island Capital LLC sell last quarter?
In Q3 2026, Harbor Island Capital LLC Warner Bros Discovery Inc (WBD) (-33.3% shares), Intel Corp (INTC) (-21.2% shares) and Comcast Corp New (CMCSA) (-19.7% shares), compared with its Q2 2026 filing.
How has Harbor Island Capital LLC's portfolio performed?
A portfolio copying Harbor Island Capital LLC's 20 largest 13F holdings each quarter, from the day each filing was public, returned +31.1% a year over the last 3 years, against +20.4% for the S&P 500. Over 1 year: +75.3% against +20.1%. Over 5 years: +18.6% a year against +11.6%.
When is Harbor Island Capital LLC's next 13F filing due?
13F filings are due 45 days after each quarter ends. Harbor Island Capital LLC's filing for the quarter ending Dec 31, 2026 is due by Feb 14, 2027; this page updates the day after it is published.
How much money does Harbor Island Capital LLC manage?
Harbor Island Capital LLC reported $277.6M of regulatory assets under management on its latest SEC Form ADV. Its 13F, which covers only US-listed stocks and options, totals $276.5M.