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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
CRWD icon
126
CrowdStrike
CRWD
$211B
$245K 0.01%
+2,512
New +$266K
ADBE icon
127
Adobe
ADBE
$103B
$244K 0.01%
1,005
+234
+30% +$64.8K
FNDX icon
128
Schwab Fundamental US Large Company Index ETF
FNDX
$27.2B
$238K 0.01%
8,541
-1,418
-14% -$40.2K
AXP icon
129
American Express
AXP
$231B
$234K 0.01%
773
-44
-5% -$14.8K
PH icon
130
Parker-Hannifin
PH
$135B
$234K 0.01%
261
-31
-11% -$29.3K
IYY icon
131
iShares Dow Jones US ETF
IYY
$3.04B
$229K 0.01%
1,446
– –
IGM icon
132
iShares Expanded Tech Sector ETF
IGM
$10.6B
$229K 0.01%
1,932
– –
HOOD icon
133
Robinhood
HOOD
$81.6B
$228K 0.01%
3,290
-529,109
-99% -$46.4M
HD icon
134
Home Depot
HD
$349B
$226K 0.01%
686
-276
-29% -$101K
TMUS icon
135
T-Mobile US
TMUS
$193B
$225K 0.01%
1,070
-1,092
-51% -$224K
ENTG icon
136
Entegris
ENTG
$21.8B
$217K 0.01%
+1,852
New +$219K
MTCH icon
137
Match Group
MTCH
$8.4B
$215K 0.01%
+7,011
New +$219K
COF icon
138
Capital One
COF
$135B
$215K 0.01%
1,180
+147
+14% +$30.7K
NEE icon
139
NextEra Energy
NEE
$176B
$210K 0.01%
2,266
-529
-19% -$47K
CI icon
140
Cigna
CI
$72.7B
$206K 0.01%
+771
New +$213K
TDY icon
141
Teledyne Technologies
TDY
$31.9B
$204K 0.01%
+338
New +$211K
PHG icon
142
Philips
PHG
$25.7B
$203K 0.01%
+7,695
New +$218K
VRT icon
143
Vertiv
VRT
$106B
$203K 0.01%
+810
New +$180K
COHR icon
144
Coherent
COHR
$65.4B
$202K 0.01%
+846
New +$194K
PACB icon
145
Pacific Biosciences
PACB
$363M
$201K 0.01%
+152,100
New +$272K
AON icon
146
Aon
AON
$76.5B
$201K 0.01%
622
-199
-24% -$66.1K
OMDA
147
Omada Health Inc
OMDA
$1.16B
$200K 0.01%
15,909
– –
TMC icon
148
TMC The Metals Company
TMC
$1.78B
$46.7K ﹤0.01%
+10,000
New +$64.4K
BKNG icon
149
Booking.com
BKNG
$156B
– –
-95,175
Closed -$20.4M
BN icon
150
Brookfield
BN
$108B
– –
-4,628
Closed -$212K
3 4 5
6
7

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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.