2026 Q1 Portfolio Activity
In 2026 Q1, Main Street Research LLC maintained a portfolio of 160 distinct positions. The most significant new addition was CORNING INC, now representing 3.07% of the total fund value. They heavily accumulated shares in MICRON TECHNOLOGY INC, increasing the position by 1949.8%. Conversely, Main Street Research LLC completely exited their position in ROBINHOOD MKTS INC.
Position History
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Total Positions
160
Quarter
2026 Q1
Top Holding
NVDA (6.3%)
Top 10 Concentration
45.2%
Turnover Rate
23.4%
Sector HHI
0.18
Items per page:
Showing 1-50 of 160
Main Street Research LLC Full Holdings List — 2026 Q1
| Stock | History | Sector / Type | Port % | Prev % | Rank / Prev | Conviction | Change | % Change | Influence | Shares | Mkt Value | Avg Cost | Price Held | 1st Owned | Source | Source Date | Date Reported | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
NVDA
NVIDIA CORPORAT...
|
Technology | 6.30% | 6.36% |
#1
Prev: #1
|
5.0 |
—
|
24,932 | 4.2% |
P
S
|
620,776 | $108,263,294 |
$104.01
+111.0%
|
2017 Q1 | 13F Filing | 2026-03-31 | 2026-04-30 | ||
|
AAPL
APPLE INC
|
Technology | 5.96% | 4.52% |
#2
3
Prev: #5
|
6.4 |
—
|
112,641 | 38.7% |
P
S
|
403,578 | $102,424,173 |
$130.71
+133.5%
|
2010 Q4 | 13F Filing | 2026-03-31 | 2026-04-30 | ||
|
GOOGL
ALPHABET INC
|
Communication Services | 5.22% | 5.33% |
#3
1
Prev: #2
|
3.6 |
—
|
14,242 | 4.8% |
P
S
|
311,786 | $89,657,148 |
$131.84
+194.0%
|
2015 Q4 | 13F Filing | 2026-03-31 | 2026-04-30 | ||
|
ISCF
ISHARES TR
|
Bond/Debt | 4.76% | 4.53% |
#4
Prev: #4
|
2.9 |
—
|
50,827 | 2.7% |
P
S
|
1,958,627 | $81,851,022 | 2025 Q3 | 13F Filing | 2026-03-31 | 2026-04-30 | |||
|
TSM
TAIWAN SEMICOND...
|
Technology | 4.39% | 3.80% |
#5
4
Prev: #9
|
2.8 |
—
|
5,012 | 2.3% |
P
S
|
223,159 | $75,416,584 | 2012 Q1 | 13F Filing | 2026-03-31 | 2026-04-30 | |||
|
XBI
SPDR SERIES TRU...
|
Unknown | 4.22% | 2.51% |
#6
10
Prev: #16
|
4.7 |
—
|
206,953 | 57.4% |
P
S
|
567,479 | $72,484,093 | 2025 Q4 | 13F Filing | 2026-03-31 | 2026-04-30 | |||
|
JPM
JPMORGAN CHASE ...
|
Financial Services | 3.83% | 4.09% |
#7
Prev: #7
|
2.0 |
—
|
1,843 | 0.8% |
P
S
|
223,762 | $65,821,928 | 2014 Q2 | 13F Filing | 2026-03-31 | 2026-04-30 | |||
|
AVGO
BROADCOM INC
|
Technology | 3.83% | 4.07% |
#8
Prev: #8
|
2.0 |
—
|
7,007 | 3.4% |
P
S
|
212,402 | $65,740,470 | 2016 Q3 | 13F Filing | 2026-03-31 | 2026-04-30 | |||
|
MCK
MCKESSON CORP
|
Healthcare | 3.41% | 3.16% |
#9
5
Prev: #14
|
1.9 |
—
|
413 | 0.6% |
P
S
|
67,774 | $58,649,241 | 2013 Q3 | 13F Filing | 2026-03-31 | 2026-04-30 | |||
|
AMZN
AMAZON COM INC
|
Consumer Cyclical | 3.26% | 3.43% |
#10
2
Prev: #12
|
1.8 |
—
|
9,344 | 3.6% |
P
S
|
269,193 | $56,064,761 | 2012 Q3 | 13F Filing | 2026-03-31 | 2026-04-30 | |||
|
ASML
ASML HLDG NV
|
Technology | 3.20% | 2.46% |
#11
6
Prev: #17
|
1.8 |
—
|
1,569 | 3.9% |
P
S
|
41,687 | $55,061,440 | 2012 Q4 | 13F Filing | 2026-03-31 | 2026-04-30 | |||
|
GLW
CORNING INC
|
Technology | 3.07% | — |
#12
Prev: #—
|
4.7 |
—
|
387,718 | — |
NEW
|
387,718 | $52,718,016 | 2010 Q4 | 13F Filing | 2026-03-31 | 2026-04-30 | |||
|
COST
COSTCO WHOLESAL...
|
Consumer Defensive | 2.68% | 3.08% |
#13
2
Prev: #15
|
1.1 |
—
|
-16,227 | -26.0% |
P
S
|
46,139 | $45,974,280 | 2010 Q4 | 13F Filing | 2026-03-31 | 2026-04-30 | |||
|
JNJ
JOHNSON & JOHNS...
|
Healthcare | 2.66% | 2.12% |
#14
8
Prev: #22
|
1.6 |
—
|
7,564 | 4.2% |
P
S
|
186,882 | $45,681,390 | 2010 Q4 | 13F Filing | 2026-03-31 | 2026-04-30 | |||
|
EWY
ISHARES INC
|
ETF | 2.59% | 1.98% |
#15
10
Prev: #25
|
1.5 |
—
|
6,413 | 1.8% |
P
S
|
361,874 | $44,514,121 | 2025 Q4 | 13F Filing | 2026-03-31 | 2026-04-30 | |||
|
GEV
GE VERNOVA INC
|
Industrials | 2.57% | 1.84% |
#16
12
Prev: #28
|
1.5 |
—
|
1,531 | 3.1% |
P
S
|
50,692 | $44,249,091 | 2025 Q1 | 13F Filing | 2026-03-31 | 2026-04-30 | |||
|
GLDM
WORLD GOLD TR
|
ETF | 2.53% | 2.26% |
#17
3
Prev: #20
|
1.5 |
—
|
7,135 | 1.5% |
P
S
|
469,451 | $43,513,413 | 2025 Q2 | 13F Filing | 2026-03-31 | 2026-04-30 | |||
|
CAT
CATERPILLAR INC
|
Industrials | 2.52% | 1.95% |
#18
9
Prev: #27
|
1.5 |
—
|
1,551 | 2.6% |
P
S
|
61,110 | $43,293,991 | 2010 Q4 | 13F Filing | 2026-03-31 | 2026-04-30 | |||
|
WMT
WALMART INC
|
Consumer Defensive | 2.49% | 2.16% |
#19
2
Prev: #21
|
1.5 |
—
|
6,474 | 1.9% |
P
S
|
344,869 | $42,860,264 | 2010 Q4 | 13F Filing | 2026-03-31 | 2026-04-30 | |||
|
CCJ
CAMECO CORP
|
Energy | 2.46% | 2.00% |
#20
4
Prev: #24
|
1.5 |
—
|
7,209 | 1.9% |
P
S
|
389,077 | $42,257,653 | 2018 Q2 | 13F Filing | 2026-03-31 | 2026-04-30 | |||
|
META
META PLATFORMS ...
|
Communication Services | 2.36% | 3.27% |
#21
8
Prev: #13
|
1.4 |
—
|
-15,585 | -18.0% |
P
S
|
70,962 | $40,599,690 | 2013 Q2 | 13F Filing | 2026-03-31 | 2026-04-30 | |||
|
APH
AMPHENOL CORP
|
Technology | 2.21% | 2.29% |
#22
3
Prev: #19
|
1.4 |
—
|
5,686 | 1.9% |
P
S
|
301,043 | $38,036,757 | 2025 Q3 | 13F Filing | 2026-03-31 | 2026-04-30 | |||
|
BHP
BHP BILLITON LI...
|
Basic Materials | 2.20% | — |
#23
Prev: #—
|
4.4 |
—
|
519,212 | — |
NEW
|
519,212 | $37,767,481 | 2016 Q4 | 13F Filing | 2026-03-31 | 2026-04-30 | |||
|
AZNCF
ASTRAZENECA PLC
|
Unknown | 2.19% | — |
#24
Prev: #—
|
4.4 |
—
|
190,644 | — |
NEW
|
190,644 | $37,598,810 | 2026 Q1 | 13F Filing | 2026-03-31 | 2026-04-30 | |||
|
MU
MICRON TECHNOLO...
|
Technology | 2.14% | 0.09% |
#25
25
Prev: #50
|
3.9 |
—
|
103,786 | 1949.8% |
P
S
|
109,109 | $36,861,339 | 2024 Q1 | 13F Filing | 2026-03-31 | 2026-04-30 | |||
|
RY
ROYAL BK CDA
|
Financial Services | 2.10% | — |
#26
Prev: #—
|
4.3 |
—
|
222,568 | — |
NEW
|
222,568 | $36,007,051 | 2012 Q2 | 13F Filing | 2026-03-31 | 2026-04-30 | |||
|
KEYS
KEYSIGHT TECHNO...
|
Technology | 1.86% | — |
#27
Prev: #—
|
4.2 |
—
|
112,937 | — |
NEW
|
112,937 | $31,890,021 | 2026 Q1 | 13F Filing | 2026-03-31 | 2026-04-30 | |||
|
MSFT
MICROSOFT CORP
|
Technology | 1.45% | 4.65% |
#28
25
Prev: #3
|
0.6 |
—
|
-100,665 | -59.8% |
P
S
|
67,542 | $25,001,923 | 2010 Q4 | 13F Filing | 2026-03-31 | 2026-04-30 | |||
|
PLTR
PALANTIR TECHNO...
|
Technology | 1.43% | 4.48% |
#29
23
Prev: #6
|
0.6 |
—
|
-272,603 | -61.9% |
P
S
|
167,647 | $24,523,403 | 2022 Q2 | 13F Filing | 2026-03-31 | 2026-04-30 | |||
|
PG
PROCTER & GAMBL...
|
Consumer Defensive | 1.27% | 1.24% |
#30
Prev: #30
|
1.0 |
—
|
543 | 0.4% |
P
S
|
151,627 | $21,901,068 | 2010 Q4 | 13F Filing | 2026-03-31 | 2026-04-30 | |||
|
BCS
BARCLAYS PLC
|
Financial Services | 1.05% | 2.45% |
#31
13
Prev: #18
|
0.4 |
—
|
-831,866 | -49.4% |
P
S
|
850,971 | $18,006,546 | 2025 Q3 | 13F Filing | 2026-03-31 | 2026-04-30 | |||
|
FICO
FAIR ISAAC CORP
|
Technology | 0.53% | 0.24% |
#32
6
Prev: #38
|
3.2 |
—
|
5,972 | 239.6% |
P
S
|
8,464 | $9,035,659 | 2011 Q2 | 13F Filing | 2026-03-31 | 2026-04-30 | |||
|
IBIT
ISHARES BITCOIN...
|
Bond/Debt | 0.44% | 0.51% |
#33
1
Prev: #32
|
2.2 |
—
|
16,545 | 9.2% |
P
S
|
196,085 | $7,533,586 | 2025 Q1 | 13F Filing | 2026-03-31 | 2026-04-30 | |||
|
GOOG
ALPHABET INC
|
Communication Services | 0.39% | 0.36% |
#34
1
Prev: #33
|
2.2 |
—
|
3,346 | 16.7% |
P
S
|
23,437 | $6,723,215 | 2013 Q2 | 13F Filing | 2026-03-31 | 2026-04-30 | |||
|
BRK/B
BERKSHIRE HATHA...
|
Financial Services | 0.33% | 0.35% |
#35
1
Prev: #34
|
0.6 |
—
|
-138 | -1.1% |
P
S
|
11,978 | $5,739,858 | 2011 Q1 | 13F Filing | 2026-03-31 | 2026-04-30 | |||
|
PANW
PALO ALTO NETWO...
|
Technology | 0.32% | 0.14% |
#36
8
Prev: #44
|
3.1 |
—
|
20,789 | 157.1% |
P
S
|
34,024 | $5,454,728 | 2022 Q3 | 13F Filing | 2026-03-31 | 2026-04-30 | |||
|
MCD
MCDONALDS CORP
|
Consumer Cyclical | 0.28% | 0.32% |
#37
1
Prev: #36
|
0.6 |
—
|
-3,105 | -16.7% |
P
S
|
15,483 | $4,811,858 | 2010 Q4 | 13F Filing | 2026-03-31 | 2026-04-30 | |||
|
TSLA
TESLA INC
|
Consumer Cyclical | 0.27% | 0.33% |
#38
3
Prev: #35
|
0.6 |
—
|
-411 | -3.2% |
P
S
|
12,337 | $4,586,457 | 2015 Q2 | 13F Filing | 2026-03-31 | 2026-04-30 | |||
|
SCHW
SCHWAB CHARLES ...
|
Financial Services | 0.25% | 0.18% |
#39
1
Prev: #40
|
2.6 |
—
|
14,578 | 45.9% |
P
S
|
46,360 | $4,356,950 | 2010 Q4 | 13F Filing | 2026-03-31 | 2026-04-30 | |||
|
ANET
ARISTA NETWORKS...
|
Technology | 0.25% | — |
#40
Prev: #—
|
3.6 |
—
|
34,981 | — |
NEW
|
34,981 | $4,294,967 | 2022 Q3 | 13F Filing | 2026-03-31 | 2026-04-30 | |||
|
XOM
EXXON MOBIL COR...
|
Energy | 0.24% | 0.16% |
#41
1
Prev: #42
|
0.6 |
—
|
715 | 3.1% |
P
S
|
23,924 | $4,058,946 | 2010 Q4 | 13F Filing | 2026-03-31 | 2026-04-30 | |||
|
WFC
WELLS FARGO & C...
|
Financial Services | 0.22% | 0.11% |
#42
4
Prev: #46
|
3.1 |
—
|
27,036 | 136.2% |
P
S
|
46,882 | $3,732,276 | 2010 Q4 | 13F Filing | 2026-03-31 | 2026-04-30 | |||
|
BRK/A
BERKSHIRE HATHA...
|
Financial Services | 0.21% | 0.22% |
#43
4
Prev: #39
|
1.1 |
—
|
no change | no change |
P
S
|
5 | $3,590,700 | 2011 Q1 | 13F Filing | 2026-03-31 | 2026-04-30 | |||
|
CVX
CHEVRON CORPORA...
|
Energy | 0.20% | 0.08% |
#44
7
Prev: #51
|
3.1 |
—
|
7,331 | 77.0% |
P
S
|
16,851 | $3,486,556 | 2010 Q4 | 13F Filing | 2026-03-31 | 2026-04-30 | |||
|
ADSK
AUTODESK INC
|
Technology | 0.20% | 0.24% |
#45
8
Prev: #37
|
0.6 |
—
|
112 | 0.8% |
P
S
|
14,403 | $3,448,078 | 2014 Q2 | 13F Filing | 2026-03-31 | 2026-04-30 | |||
|
IXUS
ISHARES TR
|
ETF | 0.19% | 0.15% |
#46
3
Prev: #43
|
2.6 |
—
|
7,010 | 22.2% |
P
S
|
38,583 | $3,342,831 | 2025 Q2 | 13F Filing | 2026-03-31 | 2026-04-30 | |||
|
V
VISA INC
|
Financial Services | 0.18% | 3.49% |
#47
37
Prev: #10
|
0.1 |
—
|
-163,842 | -94.1% |
P
S
|
10,246 | $3,096,790 | 2013 Q2 | 13F Filing | 2026-03-31 | 2026-04-30 | |||
|
LLY
ELI LILLY & CO
|
Healthcare | 0.16% | 0.09% |
#48
1
Prev: #49
|
3.1 |
—
|
1,489 | 104.9% |
P
S
|
2,908 | $2,674,363 | 2013 Q1 | 13F Filing | 2026-03-31 | 2026-04-30 | |||
|
URTH
ISHARES INC
|
ETF | 0.15% | 0.16% |
#49
8
Prev: #41
|
0.6 |
—
|
-396 | -2.6% |
P
S
|
14,742 | $2,653,855 | 2023 Q2 | 13F Filing | 2026-03-31 | 2026-04-30 | |||
|
ABBV
ABBVIE INC
|
Healthcare | 0.13% | 0.12% |
#50
5
Prev: #45
|
2.1 |
—
|
903 | 9.7% |
P
S
|
10,258 | $2,231,037 | 2013 Q2 | 13F Filing | 2026-03-31 | 2026-04-30 |
Showing 1-50 of 160 holdings