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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
NVDA icon
1
NVIDIA
NVDA
$4.72T
$112M 6.06%
601,558
+6,382
+1% +$1.11M
AAPL icon
2
Apple
AAPL
$4.9T
$89.5M 4.83%
351,315
+56,921
+19% +$12.9M
MSFT icon
3
Microsoft
MSFT
$3.35T
$87.1M 4.71%
168,164
+73,462
+78% +$37.5M
PLTR icon
4
Palantir
PLTR
$293B
$83.1M 4.49%
455,493
-5,939
-1% -$963K
HOOD icon
5
Robinhood
HOOD
$77.7B
$77.2M 4.17%
539,305
+2,569
+0.5% +$280K
GOOGL icon
6
Alphabet (Google) Class A
GOOGL
$4.08T
$72.9M 3.94%
299,844
+2,499
+0.8% +$523K
JPM icon
7
JPMorgan Chase
JPM
$933B
$70.9M 3.83%
224,723
+437
+0.2% +$130K
AVGO icon
8
Broadcom
AVGO
$1.85T
$68.8M 3.72%
208,426
+23,801
+13% +$7.3M
META icon
9
Meta Platforms (Facebook)
META
$1.37T
$65.5M 3.54%
89,183
+25,536
+40% +$19M
TSM icon
10
TSMC
TSM
$2.09T
$61.7M 3.33%
220,871
+83,894
+61% +$20.5M
ISCF icon
11
iShares International Small Cap Equity Factor ETF
ISCF
$662M
$61.5M 3.32%
+1,495,000
New +$59.7M
V icon
12
Visa
V
$673B
$60.5M 3.27%
177,093
+4,673
+3% +$1.62M
COST icon
13
Costco
COST
$423B
$58.7M 3.17%
63,459
+610
+1% +$585K
AMZN icon
14
Amazon
AMZN
$2.53T
$57.7M 3.12%
262,934
+38,770
+17% +$8.78M
MCK icon
15
McKesson
MCK
$101B
$53.2M 2.88%
68,892
-286
-0.4% -$201K
NFLX icon
16
Netflix
NFLX
$305B
$51.5M 2.78%
429,220
+3,320
+0.8% +$405K
UBER icon
17
Uber
UBER
$143B
$44.4M 2.4%
452,820
+3,485
+0.8% +$326K
TMUS icon
18
T-Mobile US
TMUS
$186B
$43.2M 2.33%
180,321
+667
+0.4% +$161K
ASML icon
19
ASML
ASML
$634B
$39.1M 2.11%
40,434
+22,937
+131% +$18M
MELI icon
20
Mercado Libre
MELI
$95.6B
$37M 2%
15,833
+105
+0.7% +$252K
APH icon
21
Amphenol
APH
$197B
$36.8M 1.99%
+297,311
New +$32.6M
GLDM icon
22
SPDR Gold MiniShares Trust
GLDM
$27.9B
$35.7M 1.93%
466,864
+18,377
+4% +$1.26M
SPOT icon
23
Spotify
SPOT
$107B
$35.2M 1.9%
50,422
+603
+1% +$422K
WMT icon
24
Walmart Inc
WMT
$884B
$35.1M 1.9%
340,885
+5,139
+2% +$512K
BCS icon
25
Barclays
BCS
$93.4B
$35M 1.89%
+1,694,985
New +$33.6M
1
2 3 4 5

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BCM
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EF
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IVAV
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HJGA
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CF
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BWC
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SFS
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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.