DOSSIER · 13F-HR · Q3 2026

Boston Common Asset Management, LLC

$1.7B in tracked AUM across 181 positions as of Q3 2026.

BC
CIK 0001409427 · last filed Sep 30, 2026
Total AUM
$1.7B
as of Q3 2026
Holdings
181
—
positions
Whale Score
61
61
tracked
Activity
—
no data
changes this Q
AI Analysis · Q3 2026
Portfolio Overview

Boston Common Asset Management reports a 13F portfolio valued at $1.97 billion as of 2025-12-31, down 21.7% from $2.52 billion on 2025-09-30. The filing shows 196 reported holdings and substantial portfolio activity: 38 new positions and 38 full exits, with only 3 increases and 9 reductions among continuing positions. That mix (38 in / 38 out) implies a high realized turnover during the quarter.

By count the portfolio is diversified (196 names), but concentration is meaning...

Key Holdings
  • TSM (Taiwan Semiconductor Manufacturing Co.): $164.73M (8.35%). Largest single-stock exposure. Given its size relative to the portfolio, TSM is a principal driver of portfolio performance and risk.
  • NVDA (NVIDIA): $72.76M (3.69%), MSFT (Microsoft): $70.23M (3.56%), AAPL (Apple): $66.82M (3.39%). These three plus TSM create a pronounced technology/AI/semiconductor tilt among the largest positions.
  • HDB (HDFC Bank): $56.18M (2.85%) and MS (Morgan Stanley): $37.74M (1.91%). Financials are the next meaningful block of capital after technology.
  • GOOGL/GOOG (Alphabet): combined ~$92.8M (~4.70%). Alphabet is split across two tickers but represents a sizeable combined weight.
  • Other top-50 holdings include a mix of large-cap healthcare (LLY $31.74M, MRK $26.89M), industrials/consumer names (TJX, Mercadolibre), and global exposures (Roche, Novartis, Itau, Bancolombia, SQM).

Implication: the portfolio’s largest dollar exposures are to technology and large-cap U.S./global growth franchises, while banks and select international names serve as secondary anchors.

Analysis generated by 13F Insight from SEC Form 13F filing data · Q3 2026. Methodology

Quarter at a glance — Q3 2026

Position-change comparison pending.

No quarter-over-quarter changes available.

Top 10 holdings

By portfolio weight as of Q3 2026.

#HoldingValueSharesWeight
01
TSM
Taiwan Semiconductor Manufacturing Co., Ltd.
$116M255K6.7%
02
MSFT
Microsoft Corp.
$86M168K5.0%
03
NVDA
NVIDIA Corp.
$82M361K4.8%
04
AAPL
Apple Inc.
$78M234K4.5%
05
GOOGL
Alphabet Inc.
$51M148K3.0%
06
AVGO
Broadcom Inc
$43M121K2.5%
07
GOOG
Alphabet Inc.
$36M106K2.1%
08
V
Visa Inc
$33M92K1.9%
09
MRK
Merck & Co., Inc
$31M215K1.8%
10
MU
Micron Technology Inc.
$30M28K1.7%

Filing history

2026Q3Sep 30
$1.7B▲ 2.2%
181 positionsView →
2026Q2Jun 30
$1.7B▲ 8.6%
186 positionsView →
2026Q1Mar 31
$1.6B▼ 6.4%
186 positionsView →
2025Q4Dec 31
$1.7B▼ 34.2%
195 positionsView →
2025Q3Sep 30
$2.5B▼ 29.1%
204 positionsLocked
2025Q2Jun 30
$3.6B▲ 51.1%
310 positionsLocked
2025Q1Mar 31
$2.4B▼ 31.5%
205 positionsLocked
2024Q4Dec 31
$3.4B▼ 10.5%
322 positionsLocked
2024Q3Sep 30
$3.8B▼ 1.7%
334 positionsLocked
2024Q2Jun 30
$3.9B▼ 6.7%
335 positionsLocked
2024Q1Mar 31
$4.2B▼ 4.9%
327 positionsLocked
2023Q4Dec 31
$4.4B▲ 4.8%
323 positionsLocked
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