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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
AMD icon
76
Advanced Micro Devices
AMD
$798B
$566K 0.03%
3,499
-706
-17% -$114K
IT icon
77
Gartner
IT
$11.7B
$566K 0.03%
+2,153
New +$628K
VTI icon
78
Vanguard Morningstar Total Stock Market ETF
VTI
$680B
$542K 0.03%
1,652
-355
-18% -$112K
CL icon
79
Colgate-Palmolive
CL
$74.1B
$536K 0.03%
6,699
– –
COIN icon
80
Coinbase
COIN
$38.4B
$524K 0.03%
1,553
+3
+0.2% +$1.02K
HSBC icon
81
HSBC
HSBC
$352B
$522K 0.03%
7,358
+361
+5% +$23.5K
INTU icon
82
Intuit
INTU
$88.1B
$513K 0.03%
752
+37
+5% +$26.7K
C icon
83
Citigroup
C
$224B
$497K 0.03%
4,894
+276
+6% +$26.2K
ITOT icon
84
iShares Core S&P Total US Stock Market ETF
ITOT
$97.1B
$496K 0.03%
3,405
– –
XYL icon
85
Xylem
XYL
$28.2B
$489K 0.03%
3,313
+63
+2% +$8.74K
TMO icon
86
Thermo Fisher Scientific
TMO
$214B
$483K 0.03%
996
+78
+8% +$36.3K
CW icon
87
Curtiss-Wright
CW
$26.4B
$482K 0.03%
888
– –
ABT icon
88
Abbott
ABT
$187B
$473K 0.03%
3,531
+67
+2% +$8.79K
ADBE icon
89
Adobe
ADBE
$103B
$448K 0.02%
1,270
+484
+62% +$174K
HD icon
90
Home Depot
HD
$349B
$410K 0.02%
1,011
– –
T icon
91
AT&T
T
$162B
$397K 0.02%
14,043
+1,789
+15% +$50.8K
CRWD icon
92
CrowdStrike
CRWD
$211B
$391K 0.02%
+3,192
New +$363K
SHOP icon
93
Shopify
SHOP
$191B
$389K 0.02%
2,616
+616
+31% +$83.5K
SJM icon
94
J.M. Smucker
SJM
$12.7B
$386K 0.02%
3,556
+17
+0.5% +$1.85K
SCHX icon
95
Schwab US Large- Cap ETF
SCHX
$73.9B
$383K 0.02%
14,531
+3,633
+33% +$92.3K
IBM icon
96
IBM
IBM
$220B
$365K 0.02%
1,295
-82
-6% -$21.5K
IWF icon
97
iShares Russell 1000 Growth ETF
IWF
$127B
$359K 0.02%
3,064
– –
NSC icon
98
Norfolk Southern
NSC
$76.9B
$355K 0.02%
1,181
– –
CMCSA icon
99
Comcast
CMCSA
$89.3B
$353K 0.02%
11,223
+851
+8% +$28.5K
FTNT icon
100
Fortinet
FTNT
$117B
$352K 0.02%
+4,190
New +$374K
2 3
4
5 6

Similar funds

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.