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MSR

Main Street Research Portfolio holdings

AUM $2.12B
1-Year Est. Return 67.44%
This Fund
S&P 500
This Quarter Est. Return
+11.09%
1 Year Est. Return
+67.44%
3 Year Est. Return
+232.37%
5 Year Est. Return
+381.46%
10 Year Est. Return
+1,630.85%
AUM
$1.85B
AUM Growth
+$244M
Cap. Flow
+$111M
Cap. Flow %
6.02%
Top 10 Hldgs %
42.62%
Holding
135
New
20
Increased
70
Reduced
20
Closed
6

Top Buys

Rank Stock Value
1
ISCF icon
iShares International Small Cap Equity Factor ETF
ISCF
+$59.7M
2
MSFT icon
Microsoft
MSFT
+$37.5M
3
BCS icon
Barclays
BCS
+$33.6M
4
APH icon
Amphenol
APH
+$32.6M
5
APO icon
Apollo Global Management
APO
+$30.7M

Top Sells

Rank Stock Value
1
BRK.B icon
Berkshire Hathaway Class B
BRK.B
+$49.9M
2
PG icon
Procter & Gamble
PG
+$39.7M
3
BSX icon
Boston Scientific
BSX
+$38.8M
4
SAP icon
SAP
SAP
+$36.7M
5
ISRG icon
Intuitive Surgical
ISRG
+$32.3M

Sector Composition

Rank Sector Weight
1 Technology 35.78%
2 Financials 17.52%
3 Communication Services 14.82%
4 Consumer Discretionary 7.59%
5 Consumer Staples 6.49%
Name Market Value Portfolio Weight Shares or Principal Change
in Stake 		Capital Flow
HIMS icon
101
Hims & Hers Health
HIMS
$6.87B
$352K 0.02%
6,200
– –
MA icon
102
Mastercard
MA
$505B
$338K 0.02%
594
+117
+25% +$67.2K
PEP icon
103
PepsiCo
PEP
$189B
$327K 0.02%
2,329
-262
-10% -$37.4K
EBAY icon
104
eBay
EBAY
$48.9B
$325K 0.02%
+3,576
New +$316K
TRMB icon
105
Trimble
TRMB
$13.6B
$317K 0.02%
3,883
+63
+2% +$5.14K
ADI icon
106
Analog Devices
ADI
$184B
$297K 0.02%
1,210
-537
-31% -$129K
DIA icon
107
State Street SPDR Dow Jones Industrial Average ETF Trust
DIA
$46.3B
$297K 0.02%
640
– –
TXN icon
108
Texas Instruments
TXN
$254B
$295K 0.02%
1,605
+36
+2% +$7.04K
IDXX icon
109
Idexx Laboratories
IDXX
$46.5B
$263K 0.01%
+411
New +$249K
PYPL icon
110
PayPal
PYPL
$51.1B
$258K 0.01%
3,854
+54
+1% +$3.81K
DAL icon
111
Delta Air Lines
DAL
$60.5B
$258K 0.01%
4,545
-315
-6% -$18K
KLAC icon
112
KLA
KLAC
$252B
$253K 0.01%
+2,350
New +$219K
GLD icon
113
SPDR Gold Trust
GLD
$138B
$245K 0.01%
689
– –
IGM icon
114
iShares Expanded Tech Sector ETF
IGM
$10.6B
$243K 0.01%
1,932
– –
DKNG icon
115
DraftKings
DKNG
$11B
$243K 0.01%
6,500
– –
INTC icon
116
Intel
INTC
$503B
$240K 0.01%
+7,156
New +$173K
KO icon
117
Coca-Cola
KO
$374B
$239K 0.01%
3,597
– –
LNG icon
118
Cheniere Energy
LNG
$55.7B
$237K 0.01%
1,008
– –
IYY icon
119
iShares Dow Jones US ETF
IYY
$3.04B
$235K 0.01%
1,446
– –
FNDX icon
120
Schwab Fundamental US Large Company Index ETF
FNDX
$27.2B
$225K 0.01%
8,541
– –
SCHF icon
121
Schwab International Equity ETF
SCHF
$68B
$224K 0.01%
9,606
– –
AON icon
122
Aon
AON
$76.5B
$224K 0.01%
627
+7
+1% +$2.53K
COF icon
123
Capital One
COF
$135B
$216K 0.01%
1,016
– –
TDY icon
124
Teledyne Technologies
TDY
$31.9B
$212K 0.01%
+362
New +$198K
SOXX icon
125
iShares Semiconductor ETF
SOXX
$47.7B
$209K 0.01%
+771
New +$192K
2 3 4
5
6

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BCM
Basswood Capital Management New York $2.12B AUM 19.53% 1-Year Est. Return
EF
Empirical Finance Havertown, Pennsylvania $2.13B AUM 29.56% 1-Year Est. Return
IVAV
Index Venture Associates VI St. Helier, Channel Islands, Jersey $2.11B AUM 13.76% 1-Year Est. Return
HJGA
Hardman Johnston Global Advisors Stamford, Connecticut $2.1B AUM 41.89% 1-Year Est. Return
CF
Centaurus Financial Anaheim, California $2.1B AUM 21.28% 1-Year Est. Return
BWC
Blue Whale Capital London, United Kingdom $2.1B AUM 97.03% 1-Year Est. Return
SFS
Strategic Financial Services Utica, New York $2.1B AUM 19.14% 1-Year Est. Return
AAP
Aristotle Atlantic Partners Sarasota, Florida $2.14B AUM 37.01% 1-Year Est. Return

Main Street Research's Q3 2025 Portfolio in Review

As of Q3 2025, Main Street Research held 135 positions worth $1.85B, up 15% from $1.61B the previous quarter. Its ten largest holdings account for 43% of the portfolio.

Main Street Research deployed $111M of net new capital in Q3 2025, opening 20 new positions and adding to 70 existing holdings. Its largest new stake was iShares International Small Cap Equity Factor ETF: 1,495,000 shares worth $61.5M.

By sector, the portfolio is most concentrated in Technology at 36% of assets, up from 31% a quarter earlier, followed by Financials and Communication Services.

On the sell side, the largest reduction was Berkshire Hathaway Class B, an estimated $49.9M trimmed.

  • Main Street Research's largest Q3 2025 buy was iShares International Small Cap Equity Factor ETF: 1,495,000 shares worth $61.5M.
  • Main Street Research added most to Microsoft in Q3 2025, an estimated $37.5M increase.
  • Main Street Research's biggest Q3 2025 reduction was Berkshire Hathaway Class B, cutting an estimated $49.9M.
  • Main Street Research fully exited SAP in Q3 2025, selling an estimated $36.7M.
  • Main Street Research's ten largest holdings make up 43% of its $1.85B portfolio in Q3 2025.
  • Main Street Research opened 20 new positions and closed 6 in Q3 2025.
  • Main Street Research's portfolio value rose 15% quarter-over-quarter to $1.85B.

Based on Main Street Research's 13F filing for Q3 2025, filed 13 Nov 2025.