Institutional Manager · CIK 0001687156
Harbor Advisors LLC
West Palm Beach, FL · File #028-17610
Latest AUM
$665.8M
Positions
193
Top-10 Concentration
73.0%
Filings
9
Portfolio Value Over Time
2024-03
2024-06
2024-09
2024-12
2025-03
2025-06
2025-09
2025-12
Biggest QoQ Changes
Ranked by conviction flow (share change × current price) so mark-to-market moves don't dominate. Price effect column shows how much of the $ change was just the stock moving.
| Action | Issuer | Ticker / CUSIP | Δ Shares | Flow ($) | Price Effect |
|---|---|---|---|---|---|
| EXITED | PINNACLE FINL PARTNERS INC | 72346Q104 | -12,000 | -$1.1M | $0 |
| NEW | SL GREEN RLTY CORP | 78440X887 | +17,000 | +$779,790 | $0 |
| ADD | META PLATFORMS INC | META | +1,000 | +$660,090 | -$950,912 |
| NEW | ORACLE CORP | ORCL-PD | +2,400 | +$467,784 | $0 |
| REDUCE | CUSTOMERS BANCORP INC | CUBB | -6,000 | -$438,720 | +$224,750 |
| EXITED | JOHNSON & JOHNSON | 478160104 | -2,304 | -$427,208 | $0 |
| ADD | NETFLIX INC | NFLX | +4,500 | +$421,920 | -$552,580 |
| ADD | WESTERN ALLIANCE BANCORP | WAL-PA | +5,000 | +$420,350 | -$23,850 |
| REDUCE | AMAZON COM INC | AMZN | -1,500 | -$346,230 | +$1.7M |
| NEW | PHOENIX ED PARTNERS INC | 718968100 | +10,000 | +$303,000 | $0 |
Sector Allocation
Filing History
- 13F HOLDINGS REPORTQ/E Dec 2025193 pos · $665.8M
- 13F HOLDINGS REPORTQ/E Sep 2025190 pos · $648.4M
- 13F HOLDINGS REPORTQ/E Jun 2025190 pos · $611.0M
- 13F HOLDINGS REPORTQ/E Mar 2025193 pos · $576.0M
- 13F HOLDINGS REPORTQ/E Dec 2024192 pos · $636.5M
- 13F HOLDINGS REPORTQ/E Sep 2024188 pos · $597.5M
- 13F HOLDINGS REPORTQ/E Jun 2024178 pos · $545.4M
- 13F HOLDINGS REPORTQ/E Mar 2024176 pos · $544.4M
- 13F HOLDINGS REPORTQ/E Dec 2023165 pos · $466.8M
Top 20 Holdings — Dec 2025
| # | Issuer | Ticker | Shares | Value | % of Portfolio |
|---|---|---|---|---|---|
| 1 | EQUINIX INC | EQIX | 252,790 | $193.7M | 33.53% |
| 2 | ALPHABET INC | GOOG | 155,600 | $48.7M | 8.43% |
| 3 | APPLE INC | AAPL | 148,400 | $40.3M | 6.99% |
| 4 | AMAZON COM INC | AMZN | 153,200 | $35.4M | 6.12% |
| 5 | NVIDIA CORPORATION | NVDA | 180,000 | $33.6M | 5.81% |
| 6 | CANADIAN NAT RES LTD | 136385101 | 499,800 | $16.9M | 2.93% |
| 7 | MASTERCARD INCORPORATED | MA | 26,000 | $14.8M | 2.57% |
| 8 | MICRON TECHNOLOGY INC | MU | 48,500 | $13.8M | 2.40% |
| 9 | MICROSOFT CORP | MSFT | 26,000 | $12.6M | 2.18% |
| 10 | INTERACTIVE BROKERS GROUP | 45841N107 | 186,832 | $12.0M | 2.08% |
| 11 | FTAI AVIATION LTD | FTAIN | 57,000 | $11.2M | 1.94% |
| 12 | FERGUSON ENTERPRISES INC | FERG | 41,255 | $9.2M | 1.59% |
| 13 | META PLATFORMS INC | META | 13,800 | $9.1M | 1.58% |
| 14 | JPMORGAN CHASE & CO. | VYLD | 24,148 | $7.8M | 1.35% |
| 15 | BANK OF NT BUTTERFIELD&SON | G0772R208 | 155,408 | $7.7M | 1.34% |
| 16 | S&P GLOBAL INC | SPGI | 13,667 | $7.1M | 1.24% |
| 17 | PJT PARTNERS INC | PJT | 41,519 | $6.9M | 1.20% |
| 18 | ALPHABET INC | GOOG | 20,000 | $6.3M | 1.09% |
| 19 | EVERCORE INC | EVR | 15,000 | $5.1M | 0.88% |
| 20 | NUCOR CORP | NUE | 27,992 | $4.6M | 0.79% |