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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
XLK icon
101
State Street Technology Select Sector SPDR ETF
XLK
$122B
$372K 0.02%
+2,800
New +$395K
PTC icon
102
PTC
PTC
$16B
$354K 0.02%
+2,481
New +$392K
LEN icon
103
Lennar Class A
LEN
$20.4B
$339K 0.02%
+3,904
New +$422K
DAL icon
104
Delta Air Lines
DAL
$60.5B
$338K 0.02%
5,091
+323
+7% +$21.7K
IT icon
105
Gartner
IT
$11.7B
$335K 0.02%
+2,115
New +$389K
ACN icon
106
Accenture
ACN
$105B
$334K 0.02%
1,683
-376
-18% -$87.6K
FTNT icon
107
Fortinet
FTNT
$117B
$333K 0.02%
+4,075
New +$329K
INTU icon
108
Intuit
INTU
$88.1B
$308K 0.02%
712
-67
-9% -$32K
TJX icon
109
TJX Companies
TJX
$179B
$306K 0.02%
1,919
+356
+23% +$55.4K
IWF icon
110
iShares Russell 1000 Growth ETF
IWF
$127B
$296K 0.02%
2,780
-284
-9% -$32.2K
SHOP icon
111
Shopify
SHOP
$191B
$289K 0.02%
2,436
+396
+19% +$52K
LNG icon
112
Cheniere Energy
LNG
$55.7B
$287K 0.02%
+1,010
New +$233K
SJM icon
113
J.M. Smucker
SJM
$12.7B
$276K 0.02%
2,858
-472
-14% -$49.4K
EXPE icon
114
Expedia Group
EXPE
$36.8B
$274K 0.02%
1,188
+238
+25% +$58.5K
SCHX icon
115
Schwab US Large- Cap ETF
SCHX
$73.9B
$273K 0.02%
10,635
+800
+8% +$21.5K
COIN icon
116
Coinbase
COIN
$38.4B
$271K 0.02%
1,550
-1
-0.1% -$197
INTC icon
117
Intel
INTC
$503B
$261K 0.02%
5,919
-950
-14% -$43.5K
KLAC icon
118
KLA
KLAC
$252B
$261K 0.02%
1,770
-460
-21% -$67.3K
COP icon
119
ConocoPhillips
COP
$142B
$257K 0.02%
+1,950
New +$216K
NFLX icon
120
Netflix
NFLX
$307B
$257K 0.02%
2,673
-7,948
-75% -$700K
SOXX icon
121
iShares Semiconductor ETF
SOXX
$47.7B
$254K 0.01%
771
– –
SCHF icon
122
Schwab International Equity ETF
SCHF
$68B
$253K 0.01%
10,206
+600
+6% +$15.3K
NSC icon
123
Norfolk Southern
NSC
$76.9B
$252K 0.01%
877
-240
-21% -$71.3K
IDXX icon
124
Idexx Laboratories
IDXX
$46.5B
$251K 0.01%
+447
New +$287K
MA icon
125
Mastercard
MA
$505B
$246K 0.01%
493
+2
+0.4% +$1.05K
3 4
5
6 7

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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
Strategic Financial Services Utica, New York $2.1B AUM 19.14% 1-Year Est. Return
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.