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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
JNJ icon
51
Johnson & Johnson
JNJ
$617B
$2.11M 0.11%
11,385
+85
+0.8% +$14.6K
LLY icon
52
Eli Lilly
LLY
$1.05T
$2.05M 0.11%
2,681
+2
+0.1% +$1.49K
SPY icon
53
State Street SPDR S&P 500 ETF Trust
SPY
$817B
$1.77M 0.1%
2,654
-17
-0.6% -$10.9K
CAT icon
54
Caterpillar
CAT
$401B
$1.47M 0.08%
3,081
+1,155
+60% +$493K
MMM icon
55
3M
MMM
$92.6B
$1.26M 0.07%
8,092
+36
+0.4% +$5.55K
CLX icon
56
Clorox
CLX
$12.8B
$1.16M 0.06%
9,368
+40
+0.4% +$4.96K
ORCL icon
57
Oracle
ORCL
$416B
$1.08M 0.06%
3,836
+2,473
+181% +$630K
ISTB icon
58
iShares Core 1-5 Year USD Bond ETF
ISTB
$5.12B
$1.04M 0.06%
21,228
+2,262
+12% +$110K
MU icon
59
Micron Technology
MU
$1.01T
$1,000K 0.05%
5,976
+47
+0.8% +$6.01K
IVV icon
60
iShares Core S&P 500 ETF
IVV
$896B
$970K 0.05%
1,450
+248
+21% +$160K
QQQ icon
61
Invesco QQQ Trust
QQQ
$479B
$958K 0.05%
1,595
+556
+54% +$318K
RTX icon
62
RTX Corp
RTX
$300B
$931K 0.05%
5,563
+1,078
+24% +$167K
SCHI icon
63
Schwab 5-10 Year Corporate Bond ETF
SCHI
$11.4B
$790K 0.04%
34,241
+8,232
+32% +$188K
MRK icon
64
Merck
MRK
$317B
$778K 0.04%
9,270
+302
+3% +$24.9K
IGLB icon
65
iShares 10+ Year Investment Grade Corporate Bond ETF
IGLB
$2.83B
$730K 0.04%
14,165
+4,711
+50% +$238K
ADP icon
66
Automatic Data Processing
ADP
$109B
$727K 0.04%
2,478
– –
CSCO icon
67
Cisco
CSCO
$477B
$716K 0.04%
10,472
-105
-1% -$7.16K
BMY icon
68
Bristol-Myers Squibb
BMY
$130B
$664K 0.04%
14,715
+108
+0.7% +$5.04K
SYK icon
69
Stryker
SYK
$128B
$662K 0.04%
1,791
-50
-3% -$19.3K
VOO icon
70
Vanguard S&P 500 ETF
VOO
$1.01T
$647K 0.04%
1,057
+466
+79% +$275K
BAC icon
71
Bank of America
BAC
$439B
$647K 0.03%
12,538
+2,486
+25% +$121K
BSX icon
72
Boston Scientific
BSX
$71.6B
$629K 0.03%
6,446
-374,847
-98% -$38.8M
NTES icon
73
NetEase
NTES
$83.1B
$621K 0.03%
4,085
+85
+2% +$11.7K
ACN icon
74
Accenture
ACN
$103B
$613K 0.03%
2,484
-125
-5% -$32.6K
CRM icon
75
Salesforce
CRM
$152B
$597K 0.03%
2,518
+866
+52% +$218K
1 2
3
4 5

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EF
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IVAV
Index Venture Associates VI St. Helier, Channel Islands, Jersey $2.11B AUM 13.76% 1-Year Est. Return
HJGA
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CF
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BWC
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SFS
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AAP
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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.