Boston Common Asset Management, LLC
Long book
$1.55B
Q1 2026
Positions
186
Top-10 weight
31%
concentration
Last quarter
+13.3%
SPY +14.8%
Turnover
12%
of book per quarter
Strategy in plain words
auto-generated from filingsBoston Common Asset Management, LLC is an institutional manager, running a $1.55B US long book across 186 positions.
The portfolio is moderately concentrated (top 10 ≈ 31% of the book). Turnover is modest: positions are typically held for years. Current anchor positions: TAIWAN SEMICONDUCTOR-SP ADR, NVIDIA CORP, APPLE INC, MICROSOFT CORP, ALPHABET INC-CL A.
Over the last 9 quarters its long book ran on average 0pp per quarter behind the S&P 500, beating the index in 4 of 9 quarters. Signal value of individual moves is limited — treat changes as weak evidence.
Implied long-book return vs S&P 500
methodology: positions priced quarterly, no shorts/options Fund long book S&P 500
Q1 2024
+3.5%
Q2 2024
+6.5%
Q3 2024
-3.1%
Q4 2024
-0.1%
Q1 2025
+10.5%
Q2 2025
+7.9%
Q3 2025
+4.6%
Q4 2025
-2.9%
Q1 2026
+13.3%
Sector allocation
Technology 39%
Financials 12%
Healthcare 11%
Industrials 10%
Services media 7%
Other 6%
Communications 5%
Consumer discretionary 5%
Long book by quarter
What does Boston Common own?
Q1 2026 13F| Company | Sector | Shares | Value | % of book | Change |
|---|---|---|---|---|---|
| NVDA NVIDIA CORP | Technology | 401.7K | $70.1M | 4.5% | -2.0% |
| AAPL APPLE INC | Technology | 239.5K | $60.8M | 3.9% | -4.6% |
| MSFT MICROSOFT CORP | Technology | 143.6K | $53.1M | 3.4% | -1.1% |
| GOOGL ALPHABET INC-CL A | Technology | 140.8K | $40.5M | 2.6% | -5.3% |
| AVGO BROADCOM INC | Technology | 123.5K | $38.2M | 2.5% | +1.3% |
| GOOG ALPHABET INC-CL C | Technology | 128.3K | $36.8M | 2.4% | -5.3% |
| NFLX NETFLIX INC | Services media | 352.1K | $33.9M | 2.2% | +1.6% |
| V VISA INC-CLASS A SHARES | Services media | 95.3K | $28.8M | 1.9% | -3.3% |
| MS MORGAN STANLEY | Financials | 159.9K | $26.3M | 1.7% | -8.4% |
| SPOT SPOTIFY TECHNOLOGY SA | Communications | 52.6K | $25.5M | 1.6% | +64.0% |
| VRT VERTIV HOLDINGS CO-A | Technology | 99.7K | $25.0M | 1.6% | -21.2% |
| MRK MERCK & CO. INC. | Healthcare | 198.7K | $23.9M | 1.5% | -2.2% |
| LLY ELI LILLY & CO | Healthcare | 24.4K | $22.4M | 1.4% | -10.6% |
| CL COLGATE-PALMOLIVE CO | Other | 250.2K | $21.3M | 1.4% | +7.1% |
| HUBB HUBBELL INC | Technology | 40.8K | $20.0M | 1.3% | -2.0% |
| WAB WABTEC CORP | Industrials | 74.0K | $18.5M | 1.2% | -2.0% |
| TJX TJX COMPANIES INC | Consumer discretionary | 112.7K | $18.0M | 1.2% | -3.9% |
| CRH CRH PLC | Industrials | 170.5K | $17.9M | 1.2% | -20.9% |
| DGX QUEST DIAGNOSTICS INC | Healthcare | 90.3K | $17.7M | 1.1% | +16.9% |
| TMUS T-MOBILE US INC | Communications | 83.5K | $17.5M | 1.1% | +1.1% |
| XYL XYLEM INC | Industrials | 145.6K | $17.4M | 1.1% | +7.5% |
| AWK AMERICAN WATER WORKS CO INC | Utilities | 127.7K | $17.4M | 1.1% | +4.2% |
| CB CHUBB LTD | Financials | 51.0K | $16.6M | 1.1% | -0.5% |
| VZ VERIZON COMMUNICATIONS INC | Communications | 316.7K | $15.9M | 1.0% | +6.9% |
| AMAT APPLIED MATERIALS INC | Technology | 46.4K | $15.8M | 1.0% | +138.8% |
| ECL ECOLAB INC | Other | 52.3K | $13.9M | 0.9% | -2.1% |
| CRM SALESFORCE INC | Technology | 74.0K | $13.8M | 0.9% | -0.1% |
| DHR DANAHER CORP | Technology | 71.0K | $13.5M | 0.9% | -1.8% |
| CBRE CBRE GROUP INC - A | Real estate | 98.3K | $13.3M | 0.9% | +3.0% |
| ADI ANALOG DEVICES INC | Technology | 41.5K | $13.2M | 0.9% | -7.1% |
| BNY BANK OF NEW YORK MELLON CORP | Financials | 109.5K | $13.0M | 0.8% | +6.6% |
| COST COSTCO WHOLESALE CORP | Consumer discretionary | 12.7K | $12.7M | 0.8% | -4.0% |
| EW EDWARDS LIFESCIENCES CORP | Healthcare | 156.3K | $12.5M | 0.8% | +4.5% |
| HASI HA SUSTAINABLE INFRASTRUCTUR | Financials | 319.8K | $11.8M | 0.8% | +58.4% |
| BAC BANK OF AMERICA CORP | Financials | 240.1K | $11.7M | 0.8% | -4.5% |
| CME CME GROUP INC | Financials | 39.5K | $11.7M | 0.8% | -3.1% |
| PG PROCTER & GAMBLE CO/THE | Other | 80.8K | $11.7M | 0.8% | +21.3% |
| WM WASTE MANAGEMENT INC | Utilities | 49.5K | $11.4M | 0.7% | -2.7% |
| GILD GILEAD SCIENCES INC | Healthcare | 77.2K | $10.8M | 0.7% | -8.6% |
| AMGN AMGEN INC | Healthcare | 29.6K | $10.4M | 0.7% | -10.4% |
| EMR EMERSON ELECTRIC CO | Industrials | 76.7K | $10.1M | 0.6% | -3.6% |
| RL RALPH LAUREN CORP | Other | 29.2K | $10.0M | 0.6% | -4.5% |
| BKNG BOOKING HOLDINGS INC | Industrials | 2.4K | $10.0M | 0.6% | -16.7% |
| CMI CUMMINS INC | Industrials | 18.5K | $10.0M | 0.6% | -15.9% |
| FITB FIFTH THIRD BANCORP | Financials | 213.4K | $9.9M | 0.6% | -3.5% |
| STLD STEEL DYNAMICS INC | Industrials | 52.7K | $9.5M | 0.6% | -7.1% |
| HD HOME DEPOT INC | Consumer discretionary | 27.1K | $8.9M | 0.6% | -4.6% |
| AON AON PLC-CLASS A | Financials | 26.7K | $8.6M | 0.6% | -3.3% |
| TT TRANE TECHNOLOGIES PLC | Technology | 19.5K | $8.1M | 0.5% | +8.3% |
| AZN ASTRAZENECA PLC | Healthcare | 41.0K | $8.1M | 0.5% | -50.9% |
13F filing history
| Period | Form | Filed | Entries | Reported value | Flags | Source |
|---|---|---|---|---|---|---|
| Q1 2026 | 13F-HR | May 7, 2026 | 186 | $1.55B | canonical | SEC ↗ |
| Q4 2025 | 13F-HR/ARESTATEMENT | May 7, 2026 | 195 | $1.66B | canonical | SEC ↗ |
| Q4 2025 | 13F-HR | Jan 15, 2026 | 196 | $1.97B | SEC ↗ | |
| Q3 2025 | 13F-HR | Oct 30, 2025 | 309 | $3.58B | canonical | SEC ↗ |
| Q2 2025 | 13F-HR | Jul 22, 2025 | 311 | $3.57B | canonical | SEC ↗ |
| Q1 2025 | 13F-HR | Apr 3, 2025 | 307 | $3.29B | canonical | SEC ↗ |
| Q4 2024 | 13F-HR | Jan 15, 2025 | 322 | $3.43B | canonical | SEC ↗ |
| Q3 2024 | 13F-HR | Oct 9, 2024 | 334 | $3.84B | $K fixed canonical | SEC ↗ |
| Q2 2024 | 13F-HR | Jul 8, 2024 | 335 | $3.90B | $K fixed canonical | SEC ↗ |
| Q1 2024 | 13F-HR | Apr 11, 2024 | 327 | $4.18B | $K fixed canonical | SEC ↗ |
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