Boston Common Asset Management, LLC
SEC Form 13F institutional filer · CIK 0001409427
13F-HR · 80 reported holdings · 2026-03-31
Boston Common Asset Management, LLC is an asset manager focused on sustainable investing.
Reported long-US-equity value
$1.03B
Top-10 concentration
40.1%
Boston Common Asset Management, LLC — $1.03B AUM allocation strategy
Boston Common Asset Management, LLC files SEC Form 13F and reports $1.03B of long US equity value across 80 reported holdings for 2026-03-31.
Its largest sector bet is Information Technology 21.5%, followed by Communication Services 12.5% and Industrials 7.8%.
The top 10 holdings account for 40% of reported value — a broadly spread portfolio. The sector and industry splits below are of the same reported value. Track quarter-over-quarter adds, trims, new positions and exits below — sourced from SEC 13F filings, public domain.
Boston Common Asset Management, LLC — latest SEC 13F insights
Reported long-US-equity value (13F AUM)
$1.03B
total across 80 reported holdings · 2026-03-31 · excludes shorts, cash, non-US
Top-10 concentration
40% of value
higher = narrower conviction; lower = spread / hedging
Biggest adds (shares)
+$AMAT +26.9K sh · +$2.32M+$VZ +20.3K sh · −$13.1M+$CL +16.5K sh · −$19.8M
Biggest trims (shares)
−$CRH −45K sh · −$39.5M−$VRT −26.8K sh · −$16.9M−$INTU −21.5K sh · −$28.9M
Exited to nil (held last quarter, gone now)
$WY ($9.49M last qtr)$TFC ($9.26M last qtr)$CCI ($6.69M last qtr)$BRK.B ($905K last qtr)$QQQ ($564K last qtr)
Sector allocation (share of reported value)
each slice is a share of the reported long-US-equity value — smaller sectors and the rest of the book roll into “Other holdings”
Qtr shift = share-point change vs the prior quarter's filing — first period tracked for this filer; the column fills in with the next quarterly refresh.
Industry allocation (share of reported value)
- Semiconductors10.5%—
- Interactive Media & Services7.5%—
- Technology Hardware, Storage & Peripherals5.9%—
- Systems Software5.1%—
- Pharmaceuticals4.5%—
- Industrial Machinery & Supplies & Components3.7%—
- Movies & Entertainment3.3%—
- Transaction & Payment Processing Services2.8%—
- Other holdings56.8%—
the finer GICS cut of the same book — same denominator — smaller industries roll into “Other holdings”
Qtr shift = share-point change vs the prior quarter's filing — first period tracked for this filer; the column fills in with the next quarterly refresh.
Top S&P 500 holdings
10 of 10 rows · sorted by Value ↓
| Ticker | Holding | Shares | Value | Δ QoQ | Weight |
|---|---|---|---|---|---|
| $NVDA | NVIDIA Corporation | 402K | $70.1M | -8.38K | 6.8% |
| $AAPL | Apple Inc | 240K | $60.8M | -11.4K | 5.9% |
| $MSFT | Microsoft Corporation | 144K | $53.1M | -1.64K | 5.2% |
| $GOOG | Alphabet Inc. Class C Capital Stock | 141K | $40.5M | -7.87K | 3.9% |
| $AVGO | Broadcom Inc | 124K | $38.2M | +1.6K | 3.7% |
| $GOOGL | Alphabet Inc | 128K | $36.8M | -7.22K | 3.6% |
| $NFLX | Netflix Inc | 352K | $33.9M | +5.52K | 3.3% |
| $V | Visa Inc | 95.3K | $28.8M | -3.21K | 2.8% |
| $MS | Morgan Stanley | 160K | $26.3M | -14.7K | 2.6% |
| $VRT | Vertiv Holdings LLC | 99.7K | $25M | -26.8K | 2.4% |
…and 70 more holdings in the full 13F filing (top positions only shown).
SEC Form 13F data sets · public domain · 45-day filing lag · >$100M AUM managers · as reported
← All 13F filers·← QuantOrb.pro
How to read Δ QoQ — the five insight categories, and the caveats
The categories. Analysts, quants and retail traders look past total portfolio value to isolate actionable signals. Five categories matter.
Conviction & concentration shifts
New positions vs complete exits — a brand-new stock signals high conviction; a full liquidation suggests a broken thesis or tax-loss harvesting. Aggressive sizing — look at share count, not dollars: a 20% share increase during a drawdown is strong dip-buying. Concentration — a narrowing top-5/10 means conviction; spreading capital across more names means hedging.
Sector & macro allocation rotations
Aggregating Δ QoQ moves across sectors shows where smart money is leaning in or sneaking out — rotating out of growth into defensives or energy, for example. The fund's total long equity exposure quarter-over-quarter is a proxy for overall institutional risk appetite.
Crowding & smart-money consensus
When several managers initiate or expand the same stock in the same quarter, that is institutional consensus. Contrarian reads: top pickers buying hard into a beaten-down name the market is selling.
Derivative & option overlays
Reported call/put changes indicate whether managers are adding downside hedges or leveraging upside exposure. Note: a long increase may be half of a market-neutral pair trade.
Who reads this
| Retail "cloners" | High-conviction ideas to replicate ~45 days after quarter-end. |
| Corporate IR | Which funds bought or dumped the stock, before the next call. |
| Quant / algo traders | Cross-sectional factor inputs: flow, momentum, ownership. |
Four caveats before you trade on it
- 45-day lag — holdings are quarter-end; positions may already be closed.
- Long-only — 13Fs miss shorts, pair trades and cash.
- No non-US / fixed income — the picture is US equities plus options.
- Corporate actions — splits and spinoffs distort raw share deltas.
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