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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
+5%
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
$1.72B
AUM Growth
-$29.6M
Cap. Flow
-$3.57M
Cap. Flow %
-0.21%
Top 10 Hldgs %
45.18%
Holding
159
New
30
Increased
76
Reduced
36
Closed
11

Top Buys

Rank Stock Value
1
GLW icon
Corning
GLW
+$46.8M
2
MU icon
Micron Technology
MU
+$40.7M
3
RY icon
Royal Bank of Canada
RY
+$37.2M
4
BHP icon
BHP
BHP
+$36.7M
5
AAPL icon
Apple
AAPL
+$29.3M

Top Sells

Rank Stock Value
1
V icon
Visa
V
+$52.7M
2
HOOD icon
Robinhood
HOOD
+$46.4M
3
MSFT icon
Microsoft
MSFT
+$42.1M
4
PLTR icon
Palantir
PLTR
+$41.7M
5
UBER icon
Uber
UBER
+$33.5M

Sector Composition

Rank Sector Weight
1 Technology 37.78%
2 Healthcare 8.82%
3 Financials 8.46%
4 Communication Services 8.15%
5 Consumer Staples 6.59%
Name Market Value Portfolio Weight Shares or Principal Change
in Stake 		Capital Flow
RY icon
26
Royal Bank of Canada
RY
$291B
$36M 2.1%
+222,568
New +$37.2M
KEYS icon
27
Keysight
KEYS
$58.3B
$31.9M 1.86%
+112,937
New +$28.3M
MSFT icon
28
Microsoft
MSFT
$3.68T
$25M 1.45%
67,542
-100,665
-60% -$42.1M
PLTR icon
29
Palantir
PLTR
$389B
$24.5M 1.43%
167,647
-272,603
-62% -$41.7M
PG icon
30
Procter & Gamble
PG
$342B
$21.9M 1.27%
151,627
+543
+0.4% +$82.3K
BCS icon
31
Barclays
BCS
$94.9B
$18M 1.05%
850,971
-831,866
-49% -$20.3M
FICO icon
32
Fair Isaac
FICO
$22.6B
$9.04M 0.53%
8,464
+5,972
+240% +$8.19M
IBIT icon
33
iShares Bitcoin Trust
IBIT
$47B
$7.53M 0.44%
196,085
+16,545
+9% +$716K
GOOG icon
34
Alphabet (Google) Class C
GOOG
$4.58T
$6.72M 0.39%
23,437
+3,346
+17% +$1.05M
BRK.B icon
35
Berkshire Hathaway Class B
BRK.B
$1.11T
$5.74M 0.33%
11,978
-138
-1% -$67.7K
PANW icon
36
Palo Alto Networks
PANW
$293B
$5.45M 0.32%
34,024
+20,789
+157% +$3.49M
MCD icon
37
McDonald's
MCD
$190B
$4.81M 0.28%
15,483
-3,105
-17% -$989K
TSLA icon
38
Tesla
TSLA
$1.28T
$4.59M 0.27%
12,337
-411
-3% -$169K
SCHW
39
Charles Schwab
SCHW
$185B
$4.36M 0.25%
46,360
+14,578
+46% +$1.43M
ANET icon
40
Arista Networks
ANET
$244B
$4.29M 0.25%
+34,981
New +$4.68M
XOM icon
41
ExxonMobil
XOM
$639B
$4.06M 0.24%
23,924
+715
+3% +$104K
WFC icon
42
Wells Fargo
WFC
$269B
$3.73M 0.22%
46,882
+27,036
+136% +$2.32M
BRK.A icon
43
Berkshire Hathaway Class A
BRK.A
$1.11T
$3.59M 0.21%
5
– –
CVX icon
44
Chevron
CVX
$380B
$3.49M 0.2%
16,851
+7,331
+77% +$1.34M
ADSK icon
45
Autodesk
ADSK
$49.6B
$3.45M 0.2%
14,403
+112
+0.8% +$28.2K
IXUS icon
46
iShares Core MSCI Total International Stock ETF
IXUS
$59.5B
$3.34M 0.19%
38,583
+7,010
+22% +$624K
V icon
47
Visa
V
$688B
$3.1M 0.18%
10,246
-163,842
-94% -$52.7M
LLY icon
48
Eli Lilly
LLY
$1.01T
$2.67M 0.16%
2,908
+1,489
+105% +$1.51M
URTH icon
49
iShares MSCI World ETF
URTH
$8.21B
$2.65M 0.15%
14,742
-396
-3% -$74.1K
ABBV icon
50
AbbVie
ABBV
$431B
$2.23M 0.13%
10,258
+903
+10% +$200K
1
2
3 4 5

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BCM
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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
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AAP
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Main Street Research's Q1 2026 Portfolio in Review

As of Q1 2026, Main Street Research held 159 positions worth $1.72B, down 1.7% from $1.75B the previous quarter. Its ten largest holdings account for 45% of the portfolio.

Main Street Research's Q1 2026 filing shows 30 new, 76 increased, 36 reduced and 11 closed positions. Its largest new stake was Corning: 387,718 shares worth $52.7M. The largest sale was Visa, an estimated $52.7M.

By sector, the portfolio is most concentrated in Technology at 38% of assets, up from 36% a quarter earlier, followed by Healthcare and Financials.

  • Main Street Research's largest Q1 2026 buy was Corning: 387,718 shares worth $52.7M.
  • Main Street Research added most to Micron Technology in Q1 2026, an estimated $40.7M increase.
  • Main Street Research's biggest Q1 2026 reduction was Visa, cutting an estimated $52.7M.
  • Main Street Research fully exited ICICI Bank in Q1 2026, selling an estimated $30.5M.
  • Main Street Research's ten largest holdings make up 45% of its $1.72B portfolio in Q1 2026.
  • Main Street Research opened 30 new positions and closed 11 in Q1 2026.
  • Main Street Research's portfolio value fell 1.7% quarter-over-quarter to $1.72B.

Based on Main Street Research's 13F filing for Q1 2026, filed 30 Apr 2026.