Main Street Research LLC

All Holdings — 2025 Q4

AI Portfolio Summary
In 2025 Q4, Main Street Research LLC maintained a portfolio of 146 distinct positions. The most significant new addition to the portfolio was SPDR SERIES TRUST, which now represents 2.51% of the total fund value. They heavily accumulated shares in MICROSOFT CORP, increasing their position by 0.0%. Conversely, Main Street Research LLC completely exited their position in MERCADOLIBRE INC.
PCA Score Concentration Risk
Risk ENB
Total Positions
146
Quarter
2025 Q4
Top Holding
NVDA (6.4%)
Top 10 Concentration
45.3%
Turnover Rate
23.4%
Sector HHI
0.18
Items per page:
1-25 of 146
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 6.36% 6.06% #1
Prev: #1
2.5 -5,714 -0.9%
P
S
595,844 $111,124,969 2017 Q1 13F Filing 2025-12-31 2026-02-14 (Est.)
GOOGL
ALPHABET INC
Communication Services 5.33% 3.94% #2 4
Prev: #6
2.1 -2,300 -0.8%
P
S
297,544 $93,131,345 2015 Q4 13F Filing 2025-12-31 2026-02-14 (Est.)
MSFT
MICROSOFT CORP
Technology 4.65% 4.71% #3
Prev: #3
3.9 43 0.0%
P
S
168,207 $81,348,219 2010 Q4 13F Filing 2025-12-31 2026-02-14 (Est.)
ISCF
ISHARES TR
Bond/Debt 4.53% 3.32% #4 7
Prev: #11
3.9 412,800 27.6%
P
S
1,907,800 $79,135,544 2025 Q3 13F Filing 2025-12-31 2026-02-14 (Est.)
AAPL
APPLE INC
Technology 4.52% 4.83% #5 3
Prev: #2
1.9 -60,378 -17.2%
P
S
290,937 $79,094,032 2010 Q4 13F Filing 2025-12-31 2026-02-14 (Est.)
PLTR
PALANTIR TECHNO...
Technology 4.48% 4.49% #6 2
Prev: #4
1.8 -15,243 -3.3%
P
S
440,250 $78,254,438 2022 Q2 13F Filing 2025-12-31 2026-02-14 (Est.)
JPM
JPMORGAN CHASE ...
Financial Services 4.09% 3.83% #7
Prev: #7
1.6 -2,804 -1.2%
P
S
221,919 $71,506,834 2014 Q2 13F Filing 2025-12-31 2026-02-14 (Est.)
AVGO
BROADCOM INC
Technology 4.07% 3.72% #8
Prev: #8
1.6 -3,031 -1.5%
P
S
205,395 $71,087,373 2016 Q3 13F Filing 2025-12-31 2026-02-14 (Est.)
TSM
TAIWAN SEMICOND...
Technology 3.80% 3.33% #9 1
Prev: #10
1.5 -2,724 -1.2%
P
S
218,147 $66,466,466 2012 Q1 13F Filing 2025-12-31 2026-02-14 (Est.)
V
VISA INC
Financial Services 3.49% 3.27% #10 2
Prev: #12
1.4 -3,005 -1.7%
P
S
174,088 $61,054,526 2013 Q2 13F Filing 2025-12-31 2026-02-14 (Est.)
HOOD
ROBINHOOD MKTS ...
Financial Services 3.44% 4.17% #11 6
Prev: #5
1.4 -6,906 -1.3%
P
S
532,399 $60,214,327 2022 Q2 13F Filing 2025-12-31 2026-02-14 (Est.)
AMZN
AMAZON COM INC
Consumer Cyclical 3.43% 3.12% #12 2
Prev: #14
1.4 -3,085 -1.2%
P
S
259,849 $59,978,274 2012 Q3 13F Filing 2025-12-31 2026-02-14 (Est.)
META
META PLATFORMS ...
Communication Services 3.27% 3.54% #13 4
Prev: #9
1.3 -2,636 -3.0%
P
S
86,547 $57,128,729 2013 Q2 13F Filing 2025-12-31 2026-02-14 (Est.)
MCK
MCKESSON CORP
Healthcare 3.16% 2.88% #14 1
Prev: #15
1.3 -1,531 -2.2%
P
S
67,361 $55,311,065 2013 Q3 13F Filing 2025-12-31 2026-02-14 (Est.)
COST
COSTCO WHSL COR...
Consumer Defensive 3.08% 3.17% #15 2
Prev: #13
1.2 -1,093 -1.7%
P
S
62,366 $53,780,457 2010 Q4 13F Filing 2025-12-31 2026-02-14 (Est.)
XBI
SPDR SERIES TRU...
Unknown 2.51% #16
Prev: #—
3.0 360,526 no change
NEW
360,526 $43,958,935 2025 Q4 13F Filing 2025-12-31 2026-02-14 (Est.)
ASML
ASML HOLDING N ...
Technology 2.46% 2.11% #17 2
Prev: #19
1.0 -316 -0.8%
P
S
40,118 $42,920,643 2012 Q4 13F Filing 2025-12-31 2026-02-14 (Est.)
BCS
BARCLAYS PLC
Financial Services 2.45% 1.89% #18 7
Prev: #25
1.0 -12,148 -0.7%
P
S
1,682,837 $42,828,202 2025 Q3 13F Filing 2025-12-31 2026-02-14 (Est.)
APH
AMPHENOL CORP N...
Technology 2.29% 1.99% #19 2
Prev: #21
0.9 -1,954 -0.7%
P
S
295,357 $39,988,020 2025 Q3 13F Filing 2025-12-31 2026-02-14 (Est.)
GLDM
WORLD GOLD TR
ETF 2.26% 1.93% #20 2
Prev: #22
0.9 -4,548 -1.0%
P
S
462,316 $39,467,917 2025 Q2 13F Filing 2025-12-31 2026-02-14 (Est.)
WMT
WALMART INC
Consumer Defensive 2.16% 1.90% #21 3
Prev: #24
0.9 -2,490 -0.7%
P
S
338,395 $37,779,673 2010 Q4 13F Filing 2025-12-31 2026-02-14 (Est.)
JNJ
JOHNSON & JOHNS...
Healthcare 2.12% 0.11% #22 29
Prev: #51
3.1 167,933 1475.0%
P
S
179,318 $37,109,906 2010 Q4 13F Filing 2025-12-31 2026-02-14 (Est.)
UBER
UBER TECHNOLOGI...
Technology 2.09% 2.40% #23 6
Prev: #17
0.8 -5,915 -1.3%
P
S
446,905 $36,516,608 2025 Q2 13F Filing 2025-12-31 2026-02-14 (Est.)
CCJ
CAMECO CORP
Energy 2.00% 1.65% #24 6
Prev: #30
2.8 17,476 4.8%
P
S
381,868 $34,937,103 2018 Q2 13F Filing 2025-12-31 2026-02-14 (Est.)
EWY
ISHARES INC
ETF 1.98% #25
Prev: #—
2.8 355,461 no change
NEW
355,461 $34,557,918 2025 Q4 13F Filing 2025-12-31 2026-02-14 (Est.)
MELI
MERCADOLIBRE IN...
Consumer Cyclical 0.00% 2.00%
Sold All 😨
(Was: #20)
0.3 -15,833 -100.0%
CLOSED
$— 2024 Q3 13F Filing 2025-12-31 2026-02-14 (Est.)
SPOT
SPOTIFY TECHNOL...
Communication Services 0.00% 1.90%
Sold All 😨
(Was: #23)
0.3 -50,422 -100.0%
CLOSED
$— 2025 Q2 13F Filing 2025-12-31 2026-02-14 (Est.)
APO
APOLLO GLOBAL M...
Financial Services 0.00% 1.56%
Sold All 😨
(Was: #32)
0.3 -217,067 -100.0%
CLOSED
$— 2024 Q3 13F Filing 2025-12-31 2026-02-14 (Est.)
ANET
ARISTA NETWORKS...
Technology 0.00% 0.27%
Sold All 😨
(Was: #40)
0.3 -34,884 -100.0%
CLOSED
$— 2022 Q3 13F Filing 2025-12-31 2026-02-14 (Est.)
IT
GARTNER INC
Technology 0.00% 0.03%
Sold All 😨
(Was: #77)
0.3 -2,153 -100.0%
CLOSED
$— 2011 Q2 13F Filing 2025-12-31 2026-02-14 (Est.)
CRWD
CROWDSTRIKE HLD...
Technology 0.00% 0.02%
Sold All 😨
(Was: #92)
0.3 -798 -100.0%
CLOSED
$— 2025 Q3 13F Filing 2025-12-31 2026-02-14 (Est.)
FTNT
FORTINET INC
Technology 0.00% 0.02%
Sold All 😨
(Was: #100)
0.3 -4,190 -100.0%
CLOSED
$— 2022 Q3 13F Filing 2025-12-31 2026-02-14 (Est.)
IDXX
IDEXX LABS INC
Healthcare 0.00% 0.01%
Sold All 😨
(Was: #109)
0.3 -411 -100.0%
CLOSED
$— 2025 Q3 13F Filing 2025-12-31 2026-02-14 (Est.)
PYPL
PAYPAL HLDGS IN...
Financial Services 0.00% 0.01%
Sold All 😨
(Was: #110)
0.3 -3,854 -100.0%
CLOSED
$— 2015 Q4 13F Filing 2025-12-31 2026-02-14 (Est.)
DKNG
DRAFTKINGS INC ...
Consumer Cyclical 0.00% 0.01%
Sold All 😨
(Was: #115)
0.3 -6,500 -100.0%
CLOSED
$— 2025 Q2 13F Filing 2025-12-31 2026-02-14 (Est.)
KO
COCA COLA CO
Consumer Defensive 0.00% 0.01%
Sold All 😨
(Was: #117)
0.3 -3,597 -100.0%
CLOSED
$— 2010 Q4 13F Filing 2025-12-31 2026-02-14 (Est.)
LNG
CHENIERE ENERGY...
Energy 0.00% 0.01%
Sold All 😨
(Was: #118)
0.3 -1,008 -100.0%
CLOSED
$— 2024 Q4 13F Filing 2025-12-31 2026-02-14 (Est.)
TDY
TELEDYNE TECHNO...
Technology 0.00% 0.01%
Sold All 😨
(Was: #124)
0.3 -362 -100.0%
CLOSED
$— 2022 Q1 13F Filing 2025-12-31 2026-02-14 (Est.)
SYY
SYSCO CORP
Consumer Defensive 0.00% 0.01%
Sold All 😨
(Was: #126)
0.3 -2,475 -100.0%
CLOSED
$— 2010 Q4 13F Filing 2025-12-31 2026-02-14 (Est.)
DDOG
DATADOG INC
Technology 0.00% 0.01%
Sold All 😨
(Was: #127)
0.3 -1,416 -100.0%
CLOSED
$— 2025 Q3 13F Filing 2025-12-31 2026-02-14 (Est.)
PACB
PACIFIC BIOSCIE...
Healthcare 0.00% 0.01%
Sold All 😨
(Was: #128)
0.3 -142,100 -100.0%
CLOSED
$— 2025 Q3 13F Filing 2025-12-31 2026-02-14 (Est.)
TMC
TMC THE METALS ...
Basic Materials 0.00% 0.00%
Sold All 😨
(Was: #129)
0.3 -10,000 -100.0%
CLOSED
$— 2022 Q3 13F Filing 2025-12-31 2026-02-14 (Est.)
Showing 1-25 of 146 holdings

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