CIK: 0001100710
Total reported value
$332.8M
Reporting period: 2026-03-31 · Number of holdings: 79
HARBOR ADVISORY CORP /MA/ disclosed 79 holdings in its latest 13F filing for the period ending 2026-03-31, with total reported value of $332.8M and a quarterly turnover rate of 17.8%.
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Harbor Advisory CORP /ma/'s disclosed holdings carry a Herfindahl concentration index of 0.028 — mathematically equivalent to about 36 equally-sized positions, well below its 79 actual disclosed holdings. That gap points to a strategy built around a small core of high-conviction bets rather than broad diversification.
Position sizes are fairly uniform across the portfolio (a coefficient of variation of 1.10), suggesting a disciplined, rules-based approach to how much capital goes into each idea.
No strong tilt toward either adding to existing winners or initiating outsized new positions was observed in the latest reported quarter.
Sector classification currently covers about 38% of this portfolio's disclosed value; the remainder includes holdings (e.g. unmapped tickers, options, or other security types) not yet covered by our sector mapping.
Trim GOOGL
-17.2% -$4.7M
Add CSCO
+129.5% $4.4M
Add IJH
+42.5% $4.3M
Trim VO
-29.1% -$3.0M
Add IJR
+25.1% $2.8M
Trim VB
-24.1% -$2.6M
| # | Ticker | Issuer | Asset Subclass | Weight | Weight Change | Shares Change | 4Q Trend |
|---|---|---|---|---|---|---|---|
| 1 | VOO | Vanguard S&p 500 ETF | ETF-Large Cap & Growth | 5.83% | -0.71% | -5.79% | |
| 2 | GOOGL | Alphabet Inc-cl A | Stock-Comm Services | 4.52% | -1.46% | -17.18% | |
| 3 | FTSL | First Trust Senior Loan ETF | ETF-Other | 4.34% | -0.19% | -1.29% | |
| 4 | VGK | Vanguard Ftse Europe ETF | ETF-Other | 4.26% | — | +0.81% | |
| 5 | IJH | Ishares Core S&p Midcap ETF | ETF-Other | 4.14% | +1.28% | +42.55% | |
| 6 | VWO | Vanguard Ftse Emerging Marke | ETF-Emerging Markets | 3.89% | +0.09% | +2.46% | |
| 7 | AMZN | Amazon.com INC | Stock-Consumer Disc | 3.87% | -0.60% | -3.34% | |
| 8 | IJR | Ishares Core S&p Small-cap E | ETF-Small Cap | 3.68% | +0.82% | +25.14% | |
| 9 | JPIE | Jpmorgan Income ETF | ETF-Other | 3.64% | +3.64% | NEW | |
| 10 | BRK-B | Berkshire Hathaway Inc-cl B | Stock-Other | 3.18% | -0.44% | -7.07% | |
| 11 | AAPL | Apple INC | Stock-Tech | 3.09% | -0.53% | -7.94% | |
| 12 | SOXX | Ishares Semiconductor ETF | ETF-Other | 3.07% | -0.06% | -9.53% | |
| 13 | IVV | Ishares Core S&p 500 ETF | ETF-Large Cap & Growth | 2.98% | -0.38% | -6.51% | |
| 14 | VB | Vanguard Small-cap ETF | ETF-Other | 2.63% | -0.81% | -24.14% | |
| 15 | BIP | Brookfield Infrastructure Partners L.P. | Stock-Utilities | 2.57% | -0.06% | -5.38% | |
| 16 | MSFT | Microsoft CORP | Stock-Tech | 2.45% | +0.06% | +34.67% | |
| 17 | EEMS | Ishares Msci Emerging Mkt Sm | ETF-Emerging Markets | 2.36% | +0.08% | +1.69% | |
| 18 | CSCO | Cisco Systems INC | Stock-Tech | 2.32% | +1.31% | +129.54% | |
| 19 | JNJ | Johnson & Johnson | Stock-Healthcare | 2.18% | +0.15% | -8.67% | |
| 20 | VO | Vanguard Mid-cap ETF | ETF-Other | 2.15% | -0.94% | -29.09% | |
| 21 | JPM | Jpmorgan Chase & Co | Stock-Financials | 2.04% | -0.48% | -10.73% | |
| 22 | IVOO | Vanguard S&p Mid-cap 400 ETF | ETF-Other | 1.70% | +0.03% | — | |
| 23 | FLRN | Ss Spdr Bb Ig Float Rt ETF | ETF-Other | 1.68% | -0.50% | -22.77% | |
| 24 | IBDT | Ishares Ibonds Dec 2028 ETF | ETF-Other | 1.64% | +0.03% | +3.13% | |
| 25 | SCZ | Ishares Msci Eafe Small-cap | ETF-Other | 1.55% | +0.06% | +3.65% | |
| 26 | SPDW | Ste Str Spdr Pt Dw EU ETF | ETF-Other | 1.54% | +0.03% | — | |
| 27 | PFE | Pfizer INC | Stock-Healthcare | 1.51% | +0.14% | -2.03% | |
| 28 | VIOO | Vanguard S&p Small-cap 600 E | ETF-Other | 1.35% | +0.04% | — | |
| 29 | PEP | Pepsico INC | Stock-Consumer Staples | 1.22% | — | -5.93% | |
| 30 | SPEM | State Street Sp Ptf Em ETF | ETF-Other | 1.22% | — | — | |
| 31 | ABBV | Abbvie INC | Stock-Healthcare | 1.09% | -0.26% | -14.25% | |
| 32 | IBDU | Ishares Ibonds Dec 2029 Term | ETF-Other | 1.04% | +0.15% | +18.80% | |
| 33 | MRK | Merck & Co. INC. | Stock-Healthcare | 0.86% | +0.08% | -2.20% | |
| 34 | ABT | Abbott Laboratories | Stock-Healthcare | 0.75% | -0.27% | -9.49% | |
| 35 | IJT | Ishares S&p Small-cap 600 Gr | ETF-Other | 0.73% | — | -3.09% | |
| 36 | EFA | Ishares Msci Eafe ETF | ETF-Other | 0.72% | — | — | |
| 37 | XOM | Exxon Mobil CORP | Stock-Energy | 0.72% | +0.25% | +9.35% | |
| 38 | V | Visa Inc-class A Shares | Stock-Financials | 0.67% | -0.17% | -6.78% | |
| 39 | XSD | Ss Spdr S&p Semiconductor | ETF-Other | 0.67% | -0.06% | -9.06% | |
| 40 | CVX | Chevron CORP | Stock-Energy | 0.66% | +0.17% | -0.30% | |
| 41 | IBDS | Ishrs Ibnds Dec 27 CORP ETF | ETF-Other | 0.61% | +0.05% | +9.44% | |
| 42 | FNDE | Schwab Fndmntl Em Mrk Eq ETF | ETF-Other | 0.56% | — | — | |
| 43 | EEM | Ishares Msci Emerging Market | ETF-Emerging Markets | 0.55% | — | -5.88% | |
| 44 | MDY | State Street Spdr S&p Midcap | ETF-Other | 0.51% | — | — | |
| 45 | LOW | Lowe's Cos INC | Stock-Consumer Disc | 0.50% | — | -0.29% | |
| 46 | IBDR | Ishares Ibonds Dec 2026 Term | ETF-Other | 0.49% | — | — | |
| 47 | HD | Home Depot INC | Stock-Consumer Disc | 0.47% | — | -0.66% | |
| 48 | MCD | Mcdonald's CORP | Stock-Consumer Disc | 0.42% | — | — | |
| 49 | IBDV | Ishares Ibonds Dec 2030 CORP | ETF-Other | 0.41% | +0.10% | +34.47% | |
| 50 | DGRO | Ishares Core Dividend Growth | ETF-Other | 0.41% | -0.10% | -21.12% |
Performance for Q3 2026
+2.8%
Performance Last 4 Quarters
+26.3%
Based on 77% of reported portfolio value with available pricing
| Period | Holdings | Total value | Stability | Top holdings |
|---|---|---|---|---|
| 2026-03-31 | 79 | $332.8M | 18 | |
| 2025-12-31 | 78 | $330.6M | 10 | |
| 2025-09-30 | 80 | $338.2M | 26 | |
| 2025-06-30 | 81 | $313.8M | 0 | |
| 2025-03-31 | 83 | $297.9M | 100 | |
| 2024-12-31 | 86 | $304.4M | 0 | |
| 2024-09-30 | 90 | $306.4M | 0 | |
| 2024-06-30 | 84 | $289.5M | 0 | |
| 2024-03-31 | 86 | $293.8M | 0 | |
| 2023-12-31 | 84 | $279.3M | 0 | |
| 2023-09-30 | 86 | $275.9M | 0 | |
| 2023-06-30 | 84 | $283.3M | 0 | |
| 2023-03-31 | 79 | $261.9M | 0 | |
| 2022-12-31 | 77 | $244.8M | 0 | |
| 2022-09-30 | 73 | $217.1M | 0 | |
| 2022-06-30 | 76 | $228.2M | 0 | |
| 2022-03-31 | 80 | $249.2M | 0 | |
| 2021-12-31 | 81 | $246.5M | 0 | |
| 2021-09-30 | 80 | $230.5M | 0 | |
| 2021-06-30 | 74 | $221.8M | 100 | |
| 2021-03-31 | 98 | $251.6M | 34 | |
| 2020-12-31 | 92 | $188.9M | 70 | |
| 2020-09-30 | 34 | $102.0M | 9 | |
| 2020-06-30 | 35 | $98.7M | 12 | |
| 2020-03-31 | 34 | $93.3M | 26 | |
| 2019-12-31 | 38 | $120.2M | 8 | |
| 2019-09-30 | 39 | $114.6M | 6 | |
| 2019-06-30 | 39 | $113.3M | 4 | |
| 2019-03-31 | 40 | $111.9M | 19 | |
| 2018-12-31 | 39 | $101.1M | 15 | |
| 2018-09-30 | 41 | $115.5M | 8 | |
| 2018-06-30 | 39 | $111.4M | 9 | |
| 2018-03-31 | 39 | $109.1M | 16 | |
| 2017-12-31 | 41 | $104.6M | — |
Harbor Advisory CORP /ma/'s most significant position changes for 2026-03-31: New buy: Jpmorgan Income ETF (JPIE); Sold out: Vanguard Glbl Ex-us Real Est (VNQI); Sold out: American Express Co (AXP); Sold out: Eli Lilly & Co (LLY); New buy: Seagate Technology Holdings plc (STX).
| # | Ticker | Issuer | Weight Change | Shares Change | Action |
|---|---|---|---|---|---|
| 1 | CSCO | Cisco Systems INC | +1.3% | +129.54% | Add |
| 2 | IJH | Ishares Core S&p Midcap ETF | +1.3% | +42.55% | Add |
| 3 | IJR | Ishares Core S&p Small-cap E | +0.8% | +25.14% | Add |
| 4 | XOM | Exxon Mobil CORP | +0.3% | +9.35% | Add |
| 5 | CVX | Chevron CORP | +0.2% | -0.30% | Trim |
| 6 | IBDU | Ishares Ibonds Dec 2029 Term | +0.2% | +18.80% | Add |
| 7 | JNJ | Johnson & Johnson | +0.2% | -8.67% | Trim |
| 8 | PFE | Pfizer INC | +0.1% | -2.03% | Trim |
| 9 | ACWX | Ishares Msci Acwi Ex US ETF | +0.1% | +97.07% | Add |
| 10 | IBDV | Ishares Ibonds Dec 2030 CORP | +0.1% | +34.47% | Add |
| 11 | VWO | Vanguard Ftse Emerging Marke | +0.1% | +2.46% | Add |
| 12 | EEMS | Ishares Msci Emerging Mkt Sm | +0.1% | +1.69% | Add |
| 13 | MRK | Merck & Co. INC. | +0.1% | -2.20% | Trim |
| 14 | MSFT | Microsoft CORP | +0.1% | +34.67% | Add |
| 15 | SCZ | Ishares Msci Eafe Small-cap | +0.1% | +3.65% | Add |
| 16 | IBDS | Ishrs Ibnds Dec 27 CORP ETF | +0.1% | +9.44% | Add |
| 17 | VIOO | Vanguard S&p Small-cap 600 E | 0% | — | Unchanged |
| 18 | SPDW | Ste Str Spdr Pt Dw EU ETF | 0% | — | Unchanged |
| 19 | IBDT | Ishares Ibonds Dec 2028 ETF | 0% | +3.13% | Add |
| 20 | IVOO | Vanguard S&p Mid-cap 400 ETF | 0% | — | Unchanged |
| 21 | BIPC | Brookfield Infrastructure-a | 0% | -4.42% | Trim |
| 22 | BAC | Bank Of America CORP | 0% | -0.81% | Trim |
| 23 | PFF | Ishares Preferred & Income S | -0.1% | -11.26% | Trim |
| 24 | XSD | Ss Spdr S&p Semiconductor | -0.1% | -9.06% | Trim |
| 25 | BIP | Brookfield Infrastructure Partners L.P. | -0.1% | -5.38% | Trim |
| 26 | SOXX | Ishares Semiconductor ETF | -0.1% | -9.53% | Trim |
| 27 | VNQ | Vanguard Real Estate ETF | -0.1% | -52.09% | Trim |
| 28 | DGRO | Ishares Core Dividend Growth | -0.1% | -21.12% | Trim |
| 29 | GOOG | Alphabet Inc-cl C | -0.1% | -15.25% | Trim |
| 30 | VTI | Vanguard Total Stock Mkt ETF | -0.1% | -33.84% | Trim |
| 31 | V | Visa Inc-class A Shares | -0.2% | -6.78% | Trim |
| 32 | FTSL | First Trust Senior Loan ETF | -0.2% | -1.29% | Trim |
| 33 | ABBV | Abbvie INC | -0.3% | -14.25% | Trim |
| 34 | ABT | Abbott Laboratories | -0.3% | -9.49% | Trim |
| 35 | IVV | Ishares Core S&p 500 ETF | -0.4% | -6.51% | Trim |
| 36 | BRK-B | Berkshire Hathaway Inc-cl B | -0.4% | -7.07% | Trim |
| 37 | JPM | Jpmorgan Chase & Co | -0.5% | -10.73% | Trim |
| 38 | FLRN | Ss Spdr Bb Ig Float Rt ETF | -0.5% | -22.77% | Trim |
| 39 | AAPL | Apple INC | -0.5% | -7.94% | Trim |
| 40 | AMZN | Amazon.com INC | -0.6% | -3.34% | Trim |
| 41 | VOO | Vanguard S&p 500 ETF | -0.7% | -5.79% | Trim |
| 42 | VB | Vanguard Small-cap ETF | -0.8% | -24.14% | Trim |
| 43 | VO | Vanguard Mid-cap ETF | -0.9% | -29.09% | Trim |
| 44 | GOOGL | Alphabet Inc-cl A | -1.5% | -17.18% | Trim |
| 45 | JPIE | Jpmorgan Income ETF | — | NEW | New buy |
| 46 | VNQI | Vanguard Glbl Ex-us Real Est | — | EXIT | Sold out |
| 47 | AXP | American Express Co | — | EXIT | Sold out |
| 48 | LLY | Eli Lilly & Co | — | EXIT | Sold out |
| 49 | STX | Seagate Technology Holdings plc | — | NEW | New buy |
| 50 | ACWI | Ishares Msci Acwi ETF | — | NEW | New buy |
| Period | Filed | Type | EDGAR |
|---|---|---|---|
| 2026-03-31 | 2026-05-07 | 13F-HR | View on EDGAR |
| 2025-12-31 | 2026-02-06 | 13F-HR | View on EDGAR |
| 2025-09-30 | 2025-11-12 | 13F-HR | View on EDGAR |
| 2025-06-30 | 2025-08-12 | 13F-HR | View on EDGAR |
| 2025-03-31 | 2025-05-13 | 13F-HR | View on EDGAR |
| 2024-12-31 | 2025-01-29 | 13F-HR | View on EDGAR |
| 2024-09-30 | 2024-10-21 | 13F-HR | View on EDGAR |
| 2024-06-30 | 2024-07-25 | 13F-HR | View on EDGAR |
| 2024-03-31 | 2024-04-29 | 13F-HR | View on EDGAR |
| 2023-12-31 | 2024-02-05 | 13F-HR | View on EDGAR |
| 2023-09-30 | 2023-10-27 | 13F-HR | View on EDGAR |
| 2023-06-30 | 2023-08-03 | 13F-HR | View on EDGAR |
| 2023-03-31 | 2023-05-04 | 13F-HR | View on EDGAR |
| 2022-12-31 | 2023-02-07 | 13F-HR | View on EDGAR |
| 2022-09-30 | 2022-10-31 | 13F-HR | View on EDGAR |
| 2022-06-30 | 2022-08-01 | 13F-HR | View on EDGAR |
| 2022-03-31 | 2022-05-13 | 13F-HR | View on EDGAR |
| 2021-12-31 | 2022-02-07 | 13F-HR | View on EDGAR |
| 2021-09-30 | 2021-11-12 | 13F-HR | View on EDGAR |
| 2021-06-30 | 2021-08-04 | 13F-HR | View on EDGAR |
| 2021-03-31 | 2021-05-13 | 13F-HR | View on EDGAR |
| 2020-12-31 | 2021-02-16 | 13F-HR | View on EDGAR |
| 2020-09-30 | 2020-10-26 | 13F-HR | View on EDGAR |
| 2020-06-30 | 2020-08-04 | 13F-HR | View on EDGAR |
| 2020-03-31 | 2020-04-28 | 13F-HR | View on EDGAR |
| 2019-12-31 | 2020-02-05 | 13F-HR | View on EDGAR |
| 2019-09-30 | 2019-10-28 | 13F-HR | View on EDGAR |
| 2019-06-30 | 2019-07-30 | 13F-HR | View on EDGAR |
| 2019-03-31 | 2019-04-23 | 13F-HR | View on EDGAR |
| 2018-12-31 | 2019-02-05 | 13F-HR | View on EDGAR |
| 2018-09-30 | 2018-10-17 | 13F-HR | View on EDGAR |
| 2018-06-30 | 2018-07-23 | 13F-HR | View on EDGAR |
| 2018-03-31 | 2018-05-07 | 13F-HR | View on EDGAR |
| 2017-12-31 | 2018-01-30 | 13F-HR | View on EDGAR |
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