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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
+4.75%
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
$1.75B
AUM Growth
-$103M
Cap. Flow
-$128M
Cap. Flow %
-7.35%
Top 10 Hldgs %
45.32%
Holding
146
New
17
Increased
25
Reduced
77
Closed
17

Top Buys

Rank Stock Value
1
XBI icon
State Street SPDR S&P Biotech ETF
XBI
+$41.3M
2
JNJ icon
Johnson & Johnson
JNJ
+$33.2M
3
AZN icon
AstraZeneca
AZN
+$32.6M
4
EWY icon
iShares MSCI South Korea ETF
EWY
+$32.5M
5
CAT icon
Caterpillar
CAT
+$31.4M

Top Sells

Rank Stock Value
1
NFLX icon
Netflix
NFLX
+$45.1M
2
TMUS icon
T-Mobile US
TMUS
+$37.8M
3
MELI icon
Mercado Libre
MELI
+$37M
4
SPOT icon
Spotify
SPOT
+$35.2M
5
TT icon
Trane Technologies
TT
+$32.1M

Sector Composition

Rank Sector Weight
1 Technology 35.88%
2 Financials 16.32%
3 Communication Services 9.11%
4 Healthcare 7.73%
5 Consumer Staples 6.59%
Name Market Value Portfolio Weight Shares or Principal Change
in Stake 		Capital Flow
PEP icon
101
PepsiCo
PEP
$189B
$307K 0.02%
2,116
-213
-9% -$31.3K
AXP icon
102
American Express
AXP
$231B
$302K 0.02%
+817
New +$292K
TRMB icon
103
Trimble
TRMB
$13.6B
$295K 0.02%
3,762
-121
-3% -$9.64K
AON icon
104
Aon
AON
$76.5B
$290K 0.02%
821
+194
+31% +$67.7K
ISRG icon
105
Intuitive Surgical
ISRG
$132B
$288K 0.02%
+508
New +$270K
EBAY icon
106
eBay
EBAY
$48.9B
$286K 0.02%
3,286
-290
-8% -$25.1K
MA icon
107
Mastercard
MA
$505B
$280K 0.02%
491
-103
-17% -$57.6K
GLD icon
108
SPDR Gold Trust
GLD
$138B
$273K 0.02%
689
– –
FNDX icon
109
Schwab Fundamental US Large Company Index ETF
FNDX
$27.2B
$271K 0.02%
9,959
+1,418
+17% +$37.9K
KLAC icon
110
KLA
KLAC
$252B
$271K 0.02%
2,230
-120
-5% -$14.1K
ADBE icon
111
Adobe
ADBE
$103B
$270K 0.02%
771
-499
-39% -$170K
EXPE icon
112
Expedia Group
EXPE
$36.8B
$269K 0.02%
+950
New +$235K
SCHX icon
113
Schwab US Large- Cap ETF
SCHX
$73.9B
$265K 0.02%
9,835
-4,696
-32% -$125K
LRCX icon
114
Lam Research
LRCX
$383B
$261K 0.01%
+1,524
New +$237K
PH icon
115
Parker-Hannifin
PH
$135B
$257K 0.01%
+292
New +$239K
LIN icon
116
Linde
LIN
$226B
$256K 0.01%
600
-72,768
-99% -$31.2M
INTC icon
117
Intel
INTC
$503B
$253K 0.01%
6,869
-287
-4% -$10.8K
IBM icon
118
IBM
IBM
$220B
$251K 0.01%
848
-447
-35% -$134K
OMDA
119
Omada Health Inc
OMDA
$1.16B
$251K 0.01%
+15,909
New +$323K
COF icon
120
Capital One
COF
$135B
$250K 0.01%
1,033
+17
+2% +$3.78K
IGM icon
121
iShares Expanded Tech Sector ETF
IGM
$10.6B
$250K 0.01%
1,932
– –
TJX icon
122
TJX Companies
TJX
$179B
$240K 0.01%
+1,563
New +$231K
IYY icon
123
iShares Dow Jones US ETF
IYY
$3.04B
$240K 0.01%
1,446
– –
SOXX icon
124
iShares Semiconductor ETF
SOXX
$47.7B
$232K 0.01%
771
– –
SCHF icon
125
Schwab International Equity ETF
SCHF
$68B
$231K 0.01%
9,606
– –
2 3 4
5
6

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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
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
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Main Street Research's Q4 2025 Portfolio in Review

As of Q4 2025, Main Street Research held 146 positions worth $1.75B, down 5.5% from $1.85B the previous quarter. Its ten largest holdings account for 45% of the portfolio.

Main Street Research withdrew a net $128M in Q4 2025, closing 17 positions and reducing 77 holdings. Its most notable exit was Mercado Libre, an estimated $37M position sold in full.

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

Against the trend, Main Street Research opened a new position in State Street SPDR S&P Biotech ETF worth $44M.

  • Main Street Research's largest Q4 2025 buy was State Street SPDR S&P Biotech ETF: 360,526 shares worth $44M.
  • Main Street Research added most to Johnson & Johnson in Q4 2025, an estimated $33.2M increase.
  • Main Street Research's biggest Q4 2025 reduction was Netflix, cutting an estimated $45.1M.
  • Main Street Research fully exited Mercado Libre in Q4 2025, selling an estimated $37M.
  • Main Street Research's ten largest holdings make up 45% of its $1.75B portfolio in Q4 2025.
  • Main Street Research opened 17 new positions and closed 17 in Q4 2025.
  • Main Street Research's portfolio value fell 5.5% quarter-over-quarter to $1.75B.

Based on Main Street Research's 13F filing for Q4 2025, filed 9 Feb 2026.