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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
SPY icon
51
State Street SPDR S&P 500 ETF Trust
SPY
$818B
$2.12M 0.12%
3,263
+600
+23% +$408K
IVV icon
52
iShares Core S&P 500 ETF
IVV
$897B
$1.67M 0.1%
2,554
+1,294
+103% +$884K
CRM icon
53
Salesforce
CRM
$152B
$1.29M 0.08%
6,924
+560
+9% +$116K
RTX icon
54
RTX Corp
RTX
$300B
$1.17M 0.07%
6,066
+570
+10% +$113K
ISTB icon
55
iShares Core 1-5 Year USD Bond ETF
ISTB
$5.12B
$1.17M 0.07%
24,058
+1,295
+6% +$63.1K
MRK icon
56
Merck
MRK
$317B
$1.15M 0.07%
9,521
+1,737
+22% +$201K
MMM icon
57
3M
MMM
$93B
$1.14M 0.07%
7,870
-189
-2% -$30.1K
DIS icon
58
Walt Disney
DIS
$181B
$1.03M 0.06%
+10,730
New +$1.13M
QQQ icon
59
Invesco QQQ Trust
QQQ
$479B
$1.02M 0.06%
1,769
+424
+32% +$258K
SCHI icon
60
Schwab 5-10 Year Corporate Bond ETF
SCHI
$11.4B
$1.01M 0.06%
44,326
+5,833
+15% +$134K
UNP icon
61
Union Pacific
UNP
$176B
$1M 0.06%
4,129
+1,787
+76% +$438K
CLX icon
62
Clorox
CLX
$12.8B
$988K 0.06%
9,537
+412
+5% +$46.7K
IGLB icon
63
iShares 10+ Year Investment Grade Corporate Bond ETF
IGLB
$2.83B
$931K 0.05%
18,751
+2,810
+18% +$142K
PHM icon
64
Pultegroup
PHM
$24.5B
$868K 0.05%
+7,382
New +$945K
CRUS icon
65
Cirrus Logic
CRUS
$6.21B
$829K 0.05%
+5,734
New +$772K
UBER icon
66
Uber
UBER
$144B
$827K 0.05%
11,491
-435,414
-97% -$33.5M
VOO icon
67
Vanguard S&P 500 ETF
VOO
$1.01T
$796K 0.05%
1,332
+819
+160% +$512K
CSCO icon
68
Cisco
CSCO
$476B
$780K 0.05%
10,057
+373
+4% +$29.2K
GLD icon
69
SPDR Gold Trust
GLD
$137B
$777K 0.05%
1,806
+1,117
+162% +$500K
GS icon
70
Goldman Sachs
GS
$301B
$739K 0.04%
+874
New +$780K
DIA icon
71
State Street SPDR Dow Jones Industrial Average ETF Trust
DIA
$46.3B
$696K 0.04%
1,502
+862
+135% +$418K
CW icon
72
Curtiss-Wright
CW
$26.3B
$689K 0.04%
1,012
+95
+10% +$63.2K
TXN icon
73
Texas Instruments
TXN
$256B
$685K 0.04%
3,527
+1,685
+91% +$341K
ON icon
74
ON Semiconductor
ON
$18.6B
$641K 0.04%
+10,350
New +$650K
AMD icon
75
Advanced Micro Devices
AMD
$803B
$640K 0.04%
3,145
-277
-8% -$59.1K
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
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BWC
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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.