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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
AZN icon
26
AstraZeneca
AZN
$245B
$34.1M 1.95%
+185,609
New +$32.6M
CAT icon
27
Caterpillar
CAT
$382B
$34.1M 1.95%
59,559
+56,478
+1,833% +$31.4M
GEV icon
28
GE Vernova
GEV
$268B
$32.1M 1.84%
49,161
+520
+1% +$317K
IBN icon
29
ICICI Bank
IBN
$109B
$30.5M 1.74%
1,022,131
-29,783
-3% -$914K
PG icon
30
Procter & Gamble
PG
$338B
$21.7M 1.24%
151,084
-1,664
-1% -$245K
BKNG icon
31
Booking.com
BKNG
$149B
$20.4M 1.17%
95,175
-58,800
-38% -$12.1M
IBIT icon
32
iShares Bitcoin Trust
IBIT
$47B
$8.91M 0.51%
179,540
-11,302
-6% -$642K
GOOG icon
33
Alphabet (Google) Class C
GOOG
$4.56T
$6.3M 0.36%
20,091
+430
+2% +$123K
BRK.B icon
34
Berkshire Hathaway Class B
BRK.B
$1.11T
$6.09M 0.35%
12,116
-1,145
-9% -$570K
TSLA icon
35
Tesla
TSLA
$1.27T
$5.73M 0.33%
12,748
-272
-2% -$121K
MCD icon
36
McDonald's
MCD
$188B
$5.68M 0.33%
18,588
-380
-2% -$116K
ADSK icon
37
Autodesk
ADSK
$49.6B
$4.23M 0.24%
14,291
+217
+2% +$65.7K
FICO icon
38
Fair Isaac
FICO
$22.6B
$4.21M 0.24%
2,492
-6,135
-71% -$10.6M
BRK.A icon
39
Berkshire Hathaway Class A
BRK.A
$1.1T
$3.77M 0.22%
5
– –
SCHW
40
Charles Schwab
SCHW
$184B
$3.18M 0.18%
31,782
-2,316
-7% -$220K
URTH icon
41
iShares MSCI World ETF
URTH
$8.09B
$2.81M 0.16%
15,138
-1,583
-9% -$291K
XOM icon
42
ExxonMobil
XOM
$643B
$2.79M 0.16%
23,209
-1,016
-4% -$118K
IXUS icon
43
iShares Core MSCI Total International Stock ETF
IXUS
$58.7B
$2.67M 0.15%
31,573
-1,615
-5% -$135K
PANW icon
44
Palo Alto Networks
PANW
$283B
$2.44M 0.14%
13,235
-21,217
-62% -$4.28M
ABBV icon
45
AbbVie
ABBV
$433B
$2.14M 0.12%
9,355
-162
-2% -$36.9K
WFC icon
46
Wells Fargo
WFC
$266B
$1.85M 0.11%
19,846
-17,239
-46% -$1.5M
SPY icon
47
State Street SPDR S&P 500 ETF Trust
SPY
$806B
$1.82M 0.1%
2,663
+9
+0.3% +$6.08K
CRM icon
48
Salesforce
CRM
$152B
$1.69M 0.1%
6,364
+3,846
+153% +$956K
LLY icon
49
Eli Lilly
LLY
$1,000B
$1.53M 0.09%
1,419
-1,262
-47% -$1.21M
MU icon
50
Micron Technology
MU
$937B
$1.52M 0.09%
5,323
-653
-11% -$150K
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 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.