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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
NVDA icon
1
NVIDIA
NVDA
$4.6T
$108M 6.3%
620,776
+24,932
+4% +$4.57M
AAPL icon
2
Apple
AAPL
$4.97T
$102M 5.96%
403,578
+112,641
+39% +$29.3M
GOOGL icon
3
Alphabet (Google) Class A
GOOGL
$4.12T
$89.7M 5.22%
311,786
+14,242
+5% +$4.47M
ISCF icon
4
iShares International Small Cap Equity Factor ETF
ISCF
$646M
$81.9M 4.76%
1,958,627
+50,827
+3% +$2.21M
TSM icon
5
TSMC
TSM
$1.94T
$75.4M 4.39%
223,159
+5,012
+2% +$1.72M
XBI icon
6
State Street SPDR S&P Biotech ETF
XBI
$10B
$72.5M 4.22%
567,479
+206,953
+57% +$25.8M
JPM icon
7
JPMorgan Chase
JPM
$916B
$65.8M 3.83%
223,762
+1,843
+0.8% +$559K
AVGO icon
8
Broadcom
AVGO
$1.76T
$65.7M 3.83%
212,402
+7,007
+3% +$2.31M
MCK icon
9
McKesson
MCK
$104B
$58.6M 3.41%
67,774
+413
+0.6% +$369K
AMZN icon
10
Amazon
AMZN
$2.44T
$56.1M 3.26%
269,193
+9,344
+4% +$2.06M
ASML icon
11
ASML
ASML
$596B
$55.1M 3.2%
41,687
+1,569
+4% +$2.15M
GLW icon
12
Corning
GLW
$107B
$52.7M 3.07%
+387,718
New +$46.8M
COST icon
13
Costco
COST
$432B
$46M 2.68%
46,139
-16,227
-26% -$15.8M
JNJ icon
14
Johnson & Johnson
JNJ
$640B
$45.7M 2.66%
186,882
+7,564
+4% +$1.76M
EWY icon
15
iShares MSCI South Korea ETF
EWY
$20.1B
$44.5M 2.59%
361,874
+6,413
+2% +$802K
GEV icon
16
GE Vernova
GEV
$240B
$44.2M 2.57%
50,692
+1,531
+3% +$1.19M
GLDM icon
17
SPDR Gold MiniShares Trust
GLDM
$27.5B
$43.5M 2.53%
469,451
+7,135
+2% +$688K
CAT icon
18
Caterpillar
CAT
$361B
$43.3M 2.52%
61,110
+1,551
+3% +$1.07M
WMT icon
19
Walmart Inc
WMT
$909B
$42.9M 2.49%
344,869
+6,474
+2% +$795K
CCJ icon
20
Cameco
CCJ
$36.8B
$42.3M 2.46%
389,077
+7,209
+2% +$825K
META icon
21
Meta Platforms (Facebook)
META
$1.49T
$40.6M 2.36%
70,962
-15,585
-18% -$9.99M
APH icon
22
Amphenol
APH
$185B
$38M 2.21%
301,043
+5,686
+2% +$800K
BHP icon
23
BHP
BHP
$211B
$37.8M 2.2%
+519,212
New +$36.7M
AZN icon
24
AstraZeneca
AZN
$269B
$37.6M 2.19%
190,644
+5,035
+3% +$971K
MU icon
25
Micron Technology
MU
$835B
$36.9M 2.14%
109,109
+103,786
+1,950% +$40.7M
1
2 3 4 5

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IVAV
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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.