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NORTHSTAR ASSET MANAGEMENT INC — 13F Holdings & Portfolio

CIK 869304 · latest 13F-HR filed 2026-07-28

Backtest portfolio

NORTHSTAR ASSET MANAGEMENT INC manages $341.2M in 13F-reported U.S. long-equity assets across 91 reported positions as of its 2026-06-30 13F-HR filing. Its largest disclosed positions are DSI (11.68%), GOOGL (7.22%), VSGX (5.89%). Quarter over quarter (versus its 2026-03-31 filing) the fund opened 10 new positions and exited 5; 38 existing positions rose in reported value and 31 fell.

AUM is the long-equity portion reported on Form 13F-HR. Excludes short positions, cash, foreign holdings, and non-13F assets. For informational purposes only — not investment advice.

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AUM
$341.2M

Long-equity book

Holdings
91

Distinct positions

Period
2026-06-30

Filed 2026-07-28

Q/Q Activity
+10 / −5 / ↑38 / ↓31

vs 2026-03-31

Portfolio charts

Latest quarter's book, what changed, and how the portfolio has evolved across filings.

Portfolio map

Q2 26
DSI11.7% · +32%GOOGL7.2% · -8%VSGX5.9% · +32%AAPL5.5% · -8%MSFT4.6% · -3%COST3.8% · -9%TJX3.6% · -11%LIN3.5% · -13%SYK3.1% · -6%BRK.A3.1% · 0%ETN2.7% · -17%HD2.5% · -6%CNI2.5% · -11%ADP2.3% · -32%AMD2.2% · -2%DDOG2.2% · 0%TSM2.2% · +10%XYL2.1% · -9%VOO2.1% · 0%IDXX1.8% · -6%ESGE1.6% · +26%NVDA1.5% · +113%VLTO1.4% · -17%UL1.2% · -27%PANW1.1% · -14%BMI1.1% · -4%DLR1.0% · -13%NDAQ1.0% · -25%MELI1.0% · +2%INTU0.9% · -11%KLAC0.8% · +938%AVGO0.8% · +747%IBN0.7% · -40%NVO0.7% · -24%ANET0.7% · -30%CWT0.7% · -20%BRK.B0.6% · +7%WINA0.5% · -36%MSEX0.5% · -27%CRM0.5% · -50%GOOG0.4% · +13%SFM0.4% · -28%BR0.4% · -44%ZM0.3% · -17%DHR0.3% · -59%GWW0.3% · 0%CSCO0.3% · -12%AFRM0.2% · newEBC0.2% · -87%MICC0.2% · -4%STX0.2% · newIWF0.2% · +300%AMAT0.2% · newAMZN0.2% · -10%PG0.2% · +6%TDY0.2% · -0%PEP0.1% · -2%JPM0.1% · +46%UNP0.1% · +13%OEF0.1% · 0%

Box size = position value; colour = change in share count vs the prior quarter (green added, red trimmed, blue new). Rows split across managers or share classes are combined. Click a box for the stock.

Sector mix

% of 13F value

Sectors from each company's SIC code; funds and ETFs grouped separately.

Biggest buys and sells

Q1 26 → Q2 26

Estimated from the change in shares held × the quarter-end price, so price moves alone don't count as buying. New and exited positions are included.

13F assets and positions

4 quarters

Total reported 13F value (bars) and number of positions (line) each quarter. Value changes include market moves.

Top positions over time

reported value

The eight largest current positions, valued at each quarter end.

Concentration

top 10 = 52%

Cumulative share of the portfolio held in the largest N positions.

Firm Profile & Key People

As of the firm’s regulatory filing dated Sep 30, 2026.

Assets Under Management
$1.02B
Discretionary
$1.02B
Employees
17
Accounts
6
Address
311 N 7TH AVE
SUITE 100
MINNEAPOLIS, MN 55401-1237
Phone
(612) 371-5700
Website
Name Title / Status Ownership Type
DUFFY, TIMOTHY, SCOTT ControlCHIEF FINANCIAL OFFICER, CHIEF COMPLIANCE OFFICER
since Sep 2017
Less than 5%Individual
KOCOUREK, CHRISTOPHER, JOHN ControlMANAGING PARTNER, MEMBER, CLASS C
since Jan 2020
25–50%Individual
MARK, DOUGLAS, EDWIN ControlMANAGING PARTNER; MEMBER, CLASS C
since Jul 2004
25–50%Individual
SCHNEIDER, BRIAN, JAMES ControlMANAGING PARTNER; MEMBER, CLASS C
since Jan 2015
25–50%Individual
Ownership & leadership changes · 10 filings with changes since Feb 13, 2012

From the firm’s regulatory filings, newest first. Dates are filing dates: a filing that no longer lists someone does not say when they left.

Mar 31, 2023 filing
  • ChangedKOCOUREK, CHRISTOPHER, JOHN · ownership 10–25% → 25–50%
Mar 29, 2021 filing
  • No longer listedBECKER, SCOTT, LEE · ADVISING PARTNER; MEMBER · Less than 5% · listed since Dec 2017
  • No longer listedSCHROEDER, CHARLES, LEE · ADVISING PARTNER; MEMBER · Less than 5% · listed since Dec 2015
Mar 30, 2020 filing
  • AddedKOCOUREK, CHRISTOPHER, JOHN · MANAGING PARTNER, MEMBER, CLASS C · 10–25% · control person
  • ChangedMARK, DOUGLAS, EDWIN · ownership 50–75% → 25–50%
  • ChangedSCHNEIDER, BRIAN, JAMES · ownership 50–75% → 25–50%
Mar 29, 2019 filing
  • ChangedBECKER, SCOTT, LEE · title ADVISING PARTNER; MEMBER, CLASS C → ADVISING PARTNER; MEMBER; ownership 10–25% → Less than 5%
  • ChangedMARK, DOUGLAS, EDWIN · ownership 25–50% → 50–75%
  • ChangedSCHNEIDER, BRIAN, JAMES · ownership 25–50% → 50–75%
Mar 29, 2018 filing
  • ChangedBECKER, SCOTT, LEE · title MANAGING PARTNER; MEMBER, CLASS C → ADVISING PARTNER; MEMBER, CLASS C; ownership 25–50% → 10–25%; no longer a control person
Sep 21, 2017 filing
  • ChangedBECKER, SCOTT, LEE · title MANAGING PARTNER, CLASS C → MANAGING PARTNER; MEMBER, CLASS C
  • ChangedMARK, DOUGLAS, EDWIN · title MANAGING PARTNER, CLASS C → MANAGING PARTNER; MEMBER, CLASS C
  • ChangedSCHNEIDER, BRIAN, JAMES · title MANAGING PARTNER, CLASS C → MANAGING PARTNER; MEMBER, CLASS C
  • ChangedSCHROEDER, CHARLES, LEE · title ADVISING PARTNER → ADVISING PARTNER; MEMBER
Sep 5, 2017 filing
  • No longer listedLARSEN, KENNETH, RICHARD · CHIEF FINANCIAL OFFICER, CHIEF COMPLIANCE OFFICER, PARTNER · Less than 5% · control person · listed since May 2007
  • AddedDUFFY, TIMOTHY, SCOTT · CHIEF FINANCIAL OFFICER, CHIEF COMPLIANCE OFFICER · Less than 5% · control person
Mar 28, 2017 filing
  • ChangedBECKER, SCOTT, LEE · title MANAGING PARTNER, CLASS B → MANAGING PARTNER, CLASS C; ownership 10–25% → 25–50%
  • ChangedMARK, DOUGLAS, EDWIN · title MANAGING PARTNER, CLASS B → MANAGING PARTNER, CLASS C; ownership 10–25% → 25–50%
  • ChangedSCHNEIDER, BRIAN, JAMES · title MANAGING PARTNER, CLASS B → MANAGING PARTNER, CLASS C; ownership 10–25% → 25–50%
  • ChangedSCHROEDER, CHARLES, LEE · title MANAGING PARTNER, CLASS B → ADVISING PARTNER; ownership 10–25% → Less than 5%
Mar 22, 2016 filing
  • ChangedBECKER, SCOTT, LEE · ownership 25–50% → 10–25%
  • ChangedMARK, DOUGLAS, EDWIN · ownership 25–50% → 10–25%
  • ChangedSCHROEDER, CHARLES, LEE · ownership 25–50% → 10–25%; no longer a control person
Mar 26, 2015 filing
  • AddedSCHNEIDER, BRIAN, JAMES · MANAGING PARTNER, CLASS B · 10–25% · control person
  • ChangedLARSEN, KENNETH, RICHARD · title CHIEF FINANCIAL OFFICER, CHIEF COMPLIANCE OFFICER → CHIEF FINANCIAL OFFICER, CHIEF COMPLIANCE OFFICER, PARTNER
Older changes (1 more filing)
Feb 13, 2012 filing (earliest on record)
  • ListedBECKER, SCOTT, LEE · MANAGING PARTNER, CLASS B · 25–50% · control person
  • ListedLARSEN, KENNETH, RICHARD · CHIEF FINANCIAL OFFICER, CHIEF COMPLIANCE OFFICER · Less than 5% · control person
  • ListedMARK, DOUGLAS, EDWIN · MANAGING PARTNER, CLASS B · 25–50% · control person
  • ListedSCHROEDER, CHARLES, LEE · MANAGING PARTNER, CLASS B · 25–50% · control person

Quarter-over-quarter changes

Changes in reported position value vs the prior 13F, so price moves count too, not just shares bought or sold.

Top Adds (vs prior quarter)

Show all 38 →

Top Trims

Show all 31 →

New Positions

Show all 10 →

Exited Positions

Show all 5 →

NORTHSTAR ASSET MANAGEMENT INC Holdings (2026-06-30)

Rows tagged Call or Put are options positions, not stock. Per SEC Form 13F-HR, Value shows the notional value of the underlying (shares covered × underlying price), not the option premium. Shares is the number of underlying shares covered (divide by 100 for contract count).

# Issuer Symbol CUSIP Value Weight Shares Type
1 ISHARES TR DSI 464288570 $39.9M 11.68% 279,901 SH
2 ALPHABET INC GOOGL 02079K305 $24.6M 7.22% 68,922 SH
3 VANGUARD WORLD FD VSGX 921910725 $20.1M 5.89% 244,109 SH
4 APPLE INC AAPL 037833100 $18.8M 5.50% 64,819 SH
5 MICROSOFT CORP MSFT 594918104 $15.6M 4.58% 41,891 SH
6 COSTCO WHOLESALE CORPORATION COST 22160K105 $13.1M 3.84% 14,023 SH
7 TJX COS INC NEW TJX 872540109 $12.3M 3.61% 81,385 SH
8 LINDE PLC LIN G54950103 $12.1M 3.55% 23,325 SH
9 STRYKER CORPORATION SYK 863667101 $10.6M 3.10% 33,581 SH
10 BERKSHIRE HATHAWAY INC DEL BRK.A 084670108 $10.5M 3.07% 14 SH
11 EATON CORP PLC ETN G29183103 $9.3M 2.73% 21,823 SH
12 HOME DEPOT INC HD 437076102 $8.6M 2.53% 24,461 SH
13 CANADIAN NATL RY CO CNI 136375102 $8.5M 2.50% 71,406 SH
14 AUTOMATIC DATA PROCESSING IN ADP 053015103 $7.8M 2.30% 35,000 SH
15 ADVANCED MICRO DEVICES INC AMD 007903107 $7.7M 2.24% 13,172 SH
16 DATADOG INC DDOG 23804L103 $7.4M 2.18% 28,529 SH
17 TAIWAN SEMICONDUCTOR MANUFAC TSM 874039100 $7.3M 2.15% 15,379 SH
18 XYLEM INC XYL 98419M100 $7.0M 2.06% 59,526 SH
19 VANGUARD INDEX FDS VOO 922908363 $7.0M 2.06% 10,220 SH
20 IDEXX LABS INC IDXX 45168D104 $6.3M 1.84% 11,901 SH
21 ISHARES INC ESGE 46434G863 $5.5M 1.61% 100,200 SH
22 NVIDIA CORPORATION NVDA 67066G104 $5.0M 1.47% 25,027 SH
23 VERALTO CORP VLTO 92338C103 $4.7M 1.37% 52,674 SH
24 UNILEVER PLC UL 904767803 $4.2M 1.23% 69,659 SH
25 PALO ALTO NETWORKS INC PANW 697435105 $3.9M 1.13% 11,299 SH
26 BADGER METER INC BMI 056525108 $3.6M 1.06% 24,331 SH
27 DIGITAL RLTY TR INC DLR 253868103 $3.6M 1.04% 19,811 SH
28 NASDAQ INC NDAQ 631103108 $3.4M 0.99% 43,041 SH
29 MERCADOLIBRE INC MELI 58733R102 $3.3M 0.96% 1,922 SH
30 INTUIT INTU 461202103 $3.0M 0.88% 11,443 SH
31 KLA CORP KLAC 482480100 $2.8M 0.83% 9,335 SH
32 BROADCOM INC AVGO 11135F101 $2.7M 0.79% 7,130 SH
33 ICICI BANK LIMITED IBN 45104G104 $2.5M 0.74% 86,720 SH
34 NOVO-NORDISK A S NVO 670100205 $2.5M 0.73% 51,796 SH
35 ARISTA NETWORKS INC ANET 040413205 $2.4M 0.71% 14,362 SH
36 CALIFORNIA WTR SVC GROUP CWT 130788102 $2.3M 0.69% 48,193 SH
37 BERKSHIRE HATHAWAY INC DEL BRK.B 084670702 $2.2M 0.64% 4,356 SH
38 WINMARK CORP WINA 974250102 $1.7M 0.51% 4,114 SH
39 MIDDLESEX WTR CO MSEX 596680108 $1.6M 0.46% 27,967 SH
40 SALESFORCE INC CRM 79466L302 $1.6M 0.46% 9,955 SH
41 ALPHABET INC GOOG 02079K107 $1.5M 0.43% 4,127 SH
42 SPROUTS FMRS MKT INC SFM 85208M102 $1.4M 0.41% 16,436 SH
43 BROADRIDGE FINL SOLUTIONS IN BR 11133T103 $1.4M 0.40% 9,926 SH
44 ZOOM COMMUNICATIONS INC ZM 98980L101 $1.1M 0.31% 12,444 SH
45 DANAHER CORP DEL DHR 235851102 $952.2K 0.28% 4,999 SH
46 WW GRAINGER INC GWW 384802104 $933.2K 0.27% 686 SH
47 CISCO SYS INC CSCO 17275R102 $858.8K 0.25% 7,311 SH
48 AFFIRM HLDGS INC AFRM 00827B106 $815.5K 0.24% 10,000 SH
49 EASTERN BANKSHARES INC EBC 27627N105 $765.7K 0.22% 34,430 SH
50 MAGNUM ICE CREAM CO NV MICC N5505D105 $671.9K 0.20% 38,605 SH
Filing History
Period Filed AUM Holdings Accession
2026-06-30 2026-07-28 $341.2M 91 0001172661-26-002890
2026-03-31 2026-05-13 $325.9M 86 0001172661-26-001763
2025-12-31 2026-02-12 $387.2M 88 0001172661-26-000677
2025-09-30 2025-10-30 $384.6M 70 0001172661-25-004516
Filer Information
Address
PO BOX 301840
BOSTON, MA 02130
Phone
(617) 522-2635
Filing Manager
NORTHSTAR ASSET MANAGEMENT INC
Boston, MA
Signatory
Michelle Graham
Chief Operating Officer