CIK: 0001687156
Total reported value
$692.2M
Reporting period: 2026-03-31 · Number of holdings: 197
Harbor Advisors LLC disclosed 197 holdings in its latest 13F filing for the period ending 2026-03-31, with total reported value of $692.2M and a quarterly turnover rate of 16.6%.
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Harbor Advisors LLC's disclosed holdings carry a Herfindahl concentration index of 0.130 — mathematically equivalent to about 8 equally-sized positions, well below its 197 actual disclosed holdings. That gap points to a strategy built around a small core of high-conviction bets rather than broad diversification.
Position sizes vary widely across the portfolio (a coefficient of variation of 4.98), with a handful of outsized bets alongside many smaller positions.
No strong tilt toward either adding to existing winners or initiating outsized new positions was observed in the latest reported quarter.
Add EQIX
-5.4% $40.8M
Trim GOOGL
-6.4% -$6.8M
Add CNQ
0.0% $7.4M
Trim AMZN
0.0% -$3.5M
Trim AAPL
0.0% -$2.7M
Trim NVDA
0.0% -$2.2M
| # | Ticker | Issuer | Asset Subclass | Weight | Weight Change | Shares Change | 4Q Trend |
|---|---|---|---|---|---|---|---|
| 1 | EQIX | Equinix INC | Stock-Real Estate | 33.88% | +4.79% | -5.36% | |
| 2 | GOOGL | Alphabet Inc-cl A | Stock-Comm Services | 6.05% | -1.26% | -6.43% | |
| 3 | AAPL | Apple INC | Stock-Tech | 5.44% | -0.62% | — | |
| 4 | AMZN | Amazon.com INC | Stock-Consumer Disc | 4.61% | -0.70% | — | |
| 5 | NVDA | Nvidia CORP | Stock-Tech | 4.54% | -0.50% | — | |
| 6 | CNQ | Canadian Natural Resources | Stock-Energy | 3.52% | +0.98% | — | |
| 7 | MU | Micron Technology INC | Stock-Tech | 2.49% | +0.41% | +5.15% | |
| 8 | FTAI | FTAI Aviation Ltd. | Stock-Industrials | 2.02% | +0.33% | — | |
| 9 | MA | Mastercard INC - A | Stock-Financials | 1.88% | -0.35% | — | |
| 10 | IBKR | Interactive Brokers Gro-cl A | Stock-Financials | 1.81% | +0.01% | — | |
| 11 | MSFT | Microsoft CORP | Stock-Tech | 1.42% | -0.47% | +1.92% | |
| 12 | FERG | Ferguson Enterprises INC | Stock-Industrials | 1.39% | +0.01% | — | |
| 13 | META | Meta Platforms Inc-class A | Stock-Comm Services | 1.14% | -0.23% | — | |
| 14 | ✓ | Stock-Other | 1.10% | — | -6.76% | ||
| 15 | JPM | Jpmorgan Chase & Co | Stock-Financials | 1.03% | -0.14% | — | |
| 16 | SPGI | S&p Global INC | Stock-Financials | 0.84% | -0.23% | — | |
| 17 | PJT | Pjt Partners INC - A | Stock-Financials | 0.84% | -0.20% | — | |
| 18 | GOOG | Alphabet Inc-cl C | Stock-Comm Services | 0.83% | -0.11% | — | |
| 19 | NUE | Nucor CORP | Stock-Materials | 0.68% | — | — | |
| 20 | DLR | Digital Realty Trust INC | Stock-Real Estate | 0.67% | +0.08% | — | |
| 21 | EVR | Evercore INC - A | Stock-Financials | 0.65% | -0.12% | — | |
| 22 | TMUS | T-mobile US INC | Stock-Comm Services | 0.63% | — | — | |
| 23 | WMT | Walmart INC | Stock-Consumer Staples | 0.59% | +0.04% | — | |
| 24 | BLK | Blackrock INC | Stock-Financials | 0.55% | -0.08% | — | |
| 25 | EOG | Eog Resources INC | Stock-Energy | 0.54% | +0.13% | — | |
| 26 | HLI | Houlihan Lokey INC | Stock-Financials | 0.52% | -0.13% | — | |
| 27 | MCO | Moody's CORP | Stock-Financials | 0.50% | -0.11% | — | |
| 28 | NBIS | Nebius Group NV | Stock-Other | 0.41% | +0.06% | — | |
| 29 | MLM | Martin Marietta Materials | Stock-Materials | 0.38% | — | — | |
| 30 | MCB | Metropolitan Bank Holding Co | Stock-Other | 0.38% | — | — | |
| 31 | CVX | Chevron CORP | Stock-Energy | 0.38% | +0.09% | — | |
| 32 | CRWD | Crowdstrike Holdings INC - A | Stock-Tech | 0.35% | -0.09% | — | |
| 33 | DHR | Danaher CORP | Stock-Healthcare | 0.34% | -0.09% | — | |
| 34 | AKAM | Akamai Technologies INC | Stock-Tech | 0.33% | +0.07% | — | |
| 35 | FOX | Fox CORP - Class B | Stock-Comm Services | 0.32% | -0.08% | — | |
| 36 | PNC | Pnc Financial Services Group | Stock-Financials | 0.31% | — | — | |
| 37 | HLT | Hilton Worldwide Holdings In | Stock-Consumer Disc | 0.31% | — | — | |
| 38 | EFX | Equifax INC | Stock-Industrials | 0.31% | -0.08% | — | |
| 39 | FBK | Fb Financial CORP | Stock-Other | 0.31% | — | — | |
| 40 | CTRA | Coterra Energy INC | Stock-Energy | 0.30% | +0.06% | — | |
| 41 | GE | General Electric | Stock-Industrials | 0.29% | — | — | |
| 42 | GDS | Gds Holdings LTD - Adr | Stock-Other | 0.28% | +0.18% | +137.50% | |
| 43 | CHTR | Charter Communications Inc-a | Stock-Comm Services | 0.27% | -0.23% | -45.15% | |
| 44 | AJG | Arthur J Gallagher & Co | Stock-Financials | 0.26% | -0.07% | — | |
| 45 | HD | Home Depot INC | Stock-Consumer Disc | 0.26% | — | — | |
| 46 | APO | Apollo Global Management INC | Stock-Financials | 0.26% | -0.09% | — | |
| 47 | BPOP | Popular INC | Stock-Financials | 0.25% | — | — | |
| 48 | EG | Everest Group, Ltd. | Stock-Financials | 0.24% | — | — | |
| 49 | PLTR | Palantir Technologies Inc-a | Stock-Tech | 0.23% | -0.06% | — | |
| 50 | PANW | Palo Alto Networks INC | Stock-Tech | 0.23% | -0.12% | -20.00% |
Performance for Q3 2026
+0.8%
Performance Last 4 Quarters
+33.3%
Based on 89% of reported portfolio value with available pricing
| Period | Holdings | Total value | Stability | Top holdings |
|---|---|---|---|---|
| 2026-03-31 | 197 | $692.2M | 17 | |
| 2025-12-31 | 193 | $665.8M | 9 | |
| 2025-09-30 | 190 | $648.4M | 19 | |
| 2025-06-30 | 190 | $611.0M | 0 | |
| 2025-03-31 | 193 | $576.0M | 100 | |
| 2024-12-31 | 192 | $636.5M | 0 | |
| 2024-09-30 | 188 | $597.5M | 0 | |
| 2024-06-30 | 178 | $545.4M | 0 | |
| 2024-03-31 | 176 | $544.4M | 0 | |
| 2023-12-31 | 175 | $523.0M | 0 | |
| 2023-09-30 | 165 | $466.8M | 0 | |
| 2023-06-30 | 154 | $470.5M | 0 | |
| 2023-03-31 | 150 | $427.4M | 0 | |
| 2022-12-31 | 163 | $400.6M | 0 | |
| 2022-09-30 | 167 | $371.7M | 0 | |
| 2022-06-30 | 176 | $411.9M | 0 | |
| 2022-03-31 | 182 | $487.7M | 0 | |
| 2021-12-31 | 185 | $537.7M | 0 | |
| 2021-09-30 | 183 | $499.9M | 0 | |
| 2021-06-30 | 187 | $505.6M | 100 | |
| 2021-03-31 | 199 | $451.1M | 16 | |
| 2020-12-31 | 168 | $446.6M | 14 | |
| 2020-09-30 | 154 | $425.5M | 11 | |
| 2020-06-30 | 150 | $390.2M | 18 | |
| 2020-03-31 | 136 | $329.5M | 29 | |
| 2019-12-31 | 164 | $369.0M | 9 | |
| 2019-09-30 | 164 | $349.5M | 13 | |
| 2019-06-30 | 164 | $334.6M | 11 | |
| 2019-03-31 | 162 | $310.3M | 26 | |
| 2018-12-31 | 164 | $257.1M | 26 | |
| 2018-09-30 | 178 | $322.1M | 8 | |
| 2018-06-30 | 172 | $310.6M | 11 | |
| 2018-03-31 | 171 | $297.0M | 15 | |
| 2017-12-31 | 165 | $294.4M | 12 | |
| 2017-09-30 | 158 | $273.1M | 9 | |
| 2017-06-30 | 144 | $252.8M | 15 | |
| 2017-03-31 | 138 | $234.9M | 18 | |
| 2016-12-31 | 121 | $208.6M | — |
Harbor Advisors LLC's most significant position changes for 2026-03-31: New buy: Pinnacle Financial Partners (PNFP); New buy: Willis Lease Finance CORP (WLFC); Trim: Equinix INC (EQIX) — shares -5.36%; Trim: Alphabet Inc-cl A (GOOGL) — shares -6.43%; Add: Microsoft CORP (MSFT) — shares +1.92%.
| # | Ticker | Issuer | Weight Change | Shares Change | Action |
|---|---|---|---|---|---|
| 1 | EQIX | Equinix INC | +4.8% | -5.36% | Trim |
| 2 | CNQ | Canadian Natural Resources | +1% | — | Unchanged |
| 3 | MU | Micron Technology INC | +0.4% | +5.15% | Add |
| 4 | FTAI | FTAI Aviation Ltd. | +0.3% | — | Unchanged |
| 5 | GDS | Gds Holdings LTD - Adr | +0.2% | +137.50% | Add |
| 6 | EOG | Eog Resources INC | +0.1% | — | Unchanged |
| 7 | CVX | Chevron CORP | +0.1% | — | Unchanged |
| 8 | DLR | Digital Realty Trust INC | +0.1% | — | Unchanged |
| 9 | AKAM | Akamai Technologies INC | +0.1% | — | Unchanged |
| 10 | NBIS | Nebius Group NV | +0.1% | — | Unchanged |
| 11 | CTRA | Coterra Energy INC | +0.1% | — | Unchanged |
| 12 | VRT | Vertiv Holdings Co-a | +0.1% | — | Unchanged |
| 13 | XOM | Exxon Mobil CORP | +0.1% | — | Unchanged |
| 14 | COP | Conocophillips | +0.1% | — | Unchanged |
| 15 | WMT | Walmart INC | 0% | — | Unchanged |
| 16 | IBKR | Interactive Brokers Gro-cl A | 0% | — | Unchanged |
| 17 | FERG | Ferguson Enterprises INC | 0% | — | Unchanged |
| 18 | JEF | Jefferies Financial Group In | -0.1% | — | Unchanged |
| 19 | BRO | Brown & Brown INC | -0.1% | — | Unchanged |
| 20 | PLTR | Palantir Technologies Inc-a | -0.1% | — | Unchanged |
| 21 | AJG | Arthur J Gallagher & Co | -0.1% | — | Unchanged |
| 22 | FOX | Fox CORP - Class B | -0.1% | — | Unchanged |
| 23 | EFX | Equifax INC | -0.1% | — | Unchanged |
| 24 | BLK | Blackrock INC | -0.1% | — | Unchanged |
| 25 | BX | Blackstone INC | -0.1% | — | Unchanged |
| 26 | APO | Apollo Global Management INC | -0.1% | — | Unchanged |
| 27 | DHR | Danaher CORP | -0.1% | — | Unchanged |
| 28 | CRWD | Crowdstrike Holdings INC - A | -0.1% | — | Unchanged |
| 29 | OSG | Octave Specialty Group INC | -0.1% | — | Unchanged |
| 30 | ADBE | Adobe INC | -0.1% | — | Unchanged |
| 31 | MCO | Moody's CORP | -0.1% | — | Unchanged |
| 32 | GOOG | Alphabet Inc-cl C | -0.1% | — | Unchanged |
| 33 | ARES | Ares Management CORP - A | -0.1% | — | Unchanged |
| 34 | CSGP | Costar Group INC | -0.1% | — | Unchanged |
| 35 | PANW | Palo Alto Networks INC | -0.1% | -20.00% | Trim |
| 36 | EVR | Evercore INC - A | -0.1% | — | Unchanged |
| 37 | HLI | Houlihan Lokey INC | -0.1% | — | Unchanged |
| 38 | JPM | Jpmorgan Chase & Co | -0.1% | — | Unchanged |
| 39 | PJT | Pjt Partners INC - A | -0.2% | — | Unchanged |
| 40 | CHTR | Charter Communications Inc-a | -0.2% | -45.15% | Trim |
| 41 | SPGI | S&p Global INC | -0.2% | — | Unchanged |
| 42 | META | Meta Platforms Inc-class A | -0.2% | — | Unchanged |
| 43 | MA | Mastercard INC - A | -0.4% | — | Unchanged |
| 44 | MSFT | Microsoft CORP | -0.5% | +1.92% | Add |
| 45 | NVDA | Nvidia CORP | -0.5% | — | Unchanged |
| 46 | AAPL | Apple INC | -0.6% | — | Unchanged |
| 47 | AMZN | Amazon.com INC | -0.7% | — | Unchanged |
| 48 | GOOGL | Alphabet Inc-cl A | -1.3% | -6.43% | Trim |
| 49 | PNFP | Pinnacle Financial Partners | — | NEW | New buy |
| 50 | WLFC | Willis Lease Finance CORP | — | NEW | New buy |
| Period | Filed | Type | EDGAR |
|---|---|---|---|
| 2026-03-31 | 2026-05-07 | 13F-HR | View on EDGAR |
| 2025-12-31 | 2026-01-30 | 13F-HR | View on EDGAR |
| 2025-09-30 | 2025-11-12 | 13F-HR | View on EDGAR |
| 2025-06-30 | 2025-08-13 | 13F-HR | View on EDGAR |
| 2025-03-31 | 2025-05-15 | 13F-HR | View on EDGAR |
| 2024-12-31 | 2025-02-11 | 13F-HR | View on EDGAR |
| 2024-09-30 | 2024-11-14 | 13F-HR | View on EDGAR |
| 2024-06-30 | 2024-07-30 | 13F-HR | View on EDGAR |
| 2024-03-31 | 2024-05-01 | 13F-HR | View on EDGAR |
| 2023-12-31 | 2024-02-01 | 13F-HR | View on EDGAR |
| 2023-09-30 | 2023-11-07 | 13F-HR | View on EDGAR |
| 2023-06-30 | 2023-08-15 | Amendment | View on EDGAR |
| 2023-06-30 | 2023-08-01 | 13F-HR | View on EDGAR |
| 2023-03-31 | 2023-05-11 | 13F-HR | View on EDGAR |
| 2022-12-31 | 2023-02-13 | 13F-HR | View on EDGAR |
| 2022-09-30 | 2022-11-07 | 13F-HR | View on EDGAR |
| 2022-06-30 | 2022-08-05 | 13F-HR | View on EDGAR |
| 2022-03-31 | 2022-05-16 | 13F-HR | View on EDGAR |
| 2021-12-31 | 2022-02-14 | 13F-HR | View on EDGAR |
| 2021-09-30 | 2021-10-29 | 13F-HR | View on EDGAR |
| 2021-06-30 | 2021-08-03 | 13F-HR | View on EDGAR |
| 2021-03-31 | 2021-05-04 | 13F-HR | View on EDGAR |
| 2020-12-31 | 2021-02-11 | 13F-HR | View on EDGAR |
| 2020-09-30 | 2020-11-09 | 13F-HR | View on EDGAR |
| 2020-06-30 | 2020-08-03 | 13F-HR | View on EDGAR |
| 2020-03-31 | 2020-05-21 | 13F-HR | View on EDGAR |
| 2019-12-31 | 2020-02-13 | 13F-HR | View on EDGAR |
| 2019-09-30 | 2019-11-13 | 13F-HR | View on EDGAR |
| 2019-06-30 | 2019-08-14 | 13F-HR | View on EDGAR |
| 2019-03-31 | 2019-05-15 | 13F-HR | View on EDGAR |
| 2018-12-31 | 2019-02-15 | 13F-HR | View on EDGAR |
| 2018-09-30 | 2018-11-14 | 13F-HR | View on EDGAR |
| 2018-06-30 | 2018-08-07 | 13F-HR | View on EDGAR |
| 2018-03-31 | 2018-05-11 | 13F-HR | View on EDGAR |
| 2017-12-31 | 2018-02-07 | 13F-HR | View on EDGAR |
| 2017-09-30 | 2017-10-26 | 13F-HR | View on EDGAR |
| 2017-06-30 | 2017-08-14 | 13F-HR | View on EDGAR |
| 2017-03-31 | 2017-05-15 | 13F-HR | View on EDGAR |
| 2016-12-31 | 2017-01-30 | 13F-HR | View on EDGAR |
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