NORTHSTAR ASSET MANAGEMENT Co
SEC Form 13F institutional filer · CIK 0001132708
13F-HR · 86 reported holdings · 2026-03-31
Reported long-US-equity value
$0.27B
Top-10 concentration
55.3%
NORTHSTAR ASSET MANAGEMENT Co — $266M AUM allocation strategy
NORTHSTAR ASSET MANAGEMENT Co files SEC Form 13F and reports $266M of long US equity value across 86 reported holdings for 2026-03-31.
Its largest sector bet is Information Technology 23.3%, followed by Health Care 8.6% and Financials 5.9%.
The top 10 holdings account for 55% of reported value — a conviction-weighted book concentrated in its best ideas. 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.
NORTHSTAR ASSET MANAGEMENT Co — latest SEC 13F insights
Reported long-US-equity value (13F AUM)
$266M
total across 86 reported holdings · 2026-03-31 · excludes shorts, cash, non-US
Top-10 concentration
55% of value
higher = narrower conviction; lower = spread / hedging
Biggest adds (shares)
+$VTI +1.94K sh · −$462K+$VOO +873 sh · +$23.5K+$VB +860 sh · +$395K
Biggest trims (shares)
−$QCOM −6.9K sh · −$1.7M−$ANET −3.4K sh · −$783K−$ZTS −2.93K sh · −$664K
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)
- Technology Hardware, Storage & Peripherals14.8%—
- Multi-Sector Holdings5.9%—
- Life Sciences Tools & Services5.1%—
- Systems Software4.0%—
- Pharmaceuticals3.5%—
- Electrical Components & Equipment2.9%—
- Semiconductors2.6%—
- Integrated Oil & Gas2.1%—
- Other holdings58.9%—
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
6 of 6 rows · sorted by Value ↓
| Ticker | Holding | Shares | Value | Δ QoQ | Weight |
|---|---|---|---|---|---|
| $AAPL | Apple Inc | 155K | $39.4M | -2.67K | 14.8% |
| $BRK.B | Berkshire Hathaway Inc.-Class B | 33K | $15.8M | -640 | 5.9% |
| $MSFT | Microsoft Corporation | 28.9K | $10.7M | +35 | 4.0% |
| $TMO | Thermo Fisher Scientific Inc | 17.3K | $8.51M | -1.1K | 3.2% |
| $AME | AMETEK Inc | 36.8K | $7.88M | -687 | 3.0% |
| $NVDA | NVIDIA Corporation | 40K | $6.97M | -475 | 2.6% |
…and 80 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.
Newsletter signup
Free subscription. Daily trading day morning dispatch. No spam.