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.
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