Main Street Research LLC

In its 13F for Q3 2025 (holdings as of September 30, 2025, filed November 13, 2025), Main Street Research LLC reported 129 stock positions worth $1.9 billion. Its top holding was Nvidia (NVDA) at 6.1% of the portfolio, followed by Apple (AAPL, 4.8%) and Microsoft (MSFT, 4.7%). Compared with Q2 2025, it opened 20 new positions, sold out of 6, added to 70 and reduced 20. The biggest buy was a new position in iShares International Small (ISCF) and the biggest sale Berkshire Hathaway Class B (BRK.B, shares −89%).

Most Recent 13F
Q2 2026
Location
SAUSALITO, CA
CIK
0001513211
Portfolio Value
$1.9B (Q3 2025)
SEC Filing
0001420506-25-003188 ↗ filed Nov 13, 2025

Holdings Value

0$500.0M$1.0B$1.5B$2.0B$2.5B Q1 2024: $1.5B Q1 2024 Q2 2024: $1.5B Q2 2024 Q3 2024: $1.6B Q3 2024 Q4 2024: $1.6B Q4 2024 Q1 2025: $1.5B Q1 2025 Q2 2025: $1.6B Q2 2025 Q3 2025: $1.9B $1.9B Q3 2025 Q4 2025: $1.7B Q4 2025 Q1 2026: $1.7B Q1 2026 Q2 2026: $2.1B Q2 2026

Holdings 129 stocks · $1.9B
NVDA Nvidia Corp. 6.06% 601,558 $112.2M Add +1.1%
AAPL Apple Inc. 4.83% 351,315 $89.5M Add +19.3%
MSFT Microsoft Corp. 4.71% 168,164 $87.1M Add +77.6%
PLTR Palantir Technologies Inc. Class A 4.49% 455,493 $83.1M Reduce -1.3%
HOOD Robinhood Markets Inc. Class A 4.17% 539,305 $77.2M Add +0.5%
GOOGL Alphabet Inc. Class A 3.94% 299,844 $72.9M Add +0.8%
JPM JPMorgan Chase & Co. 3.83% 224,723 $70.9M Add +0.2%
AVGO Broadcom Inc. 3.72% 208,426 $68.8M Add +12.9%
META Meta Platforms Inc. Class A 3.54% 89,183 $65.5M Add +40.1%
TSM Taiwan Semiconductor-SP ADR 3.33% 220,871 $61.7M Add +61.3%
ISCF iShares International Small 3.32% 1,495,000 $61.5M New
V Visa Inc. Class A 3.27% 177,093 $60.5M Add +2.7%
COST Costco Wholesale Corp. 3.17% 63,459 $58.7M Add +1.0%
AMZN Amazon.com Inc. 3.12% 262,934 $57.7M Add +17.3%
MCK McKesson Corp. 2.88% 68,892 $53.2M Reduce -0.4%
NFLX Netflix Inc. 2.78% 42,922 $51.5M Add +0.8%
UBER Uber Technologies Inc. 2.40% 452,820 $44.4M Add +0.8%
TMUS T-Mobile US Inc. 2.33% 180,321 $43.2M Add +0.4%
ASML ASML Holding NV-NY Reg SHS 2.11% 40,434 $39.1M Add +131.1%
MELI MercadoLibre Inc. 2.00% 15,833 $37.0M Add +0.7%
APH Amphenol Corp. Class A 1.99% 297,311 $36.8M New
GLDM SPDR Gold Minishares Trust 1.93% 466,864 $35.7M Add +4.1%
SPOT Spotify Technology SA 1.90% 50,422 $35.2M Add +1.2%
WMT Walmart Inc. 1.90% 340,885 $35.1M Add +1.5%
BCS Barclays PLC-Spons ADR 1.89% 1,694,985 $35.0M New
LIN Linde PLC 1.88% 73,368 $34.8M Add +1.2%
BKNG Booking Holdings Inc. 1.80% 6,159 $33.3M Add +31.9%
TT Trane Technologies PLC 1.79% 78,610 $33.2M Add +3.0%
IBN Icici Bank Ltd.-Spon ADR 1.72% 1,051,914 $31.8M Add +1.1%
CCJ Cameco Corp. 1.65% 364,392 $30.6M New
GEV GE Vernova Inc. 1.62% 48,641 $29.9M Add +76.2%
APO Apollo Global Management Inc. 1.56% 217,067 $28.9M New
PG The Procter & Gamble Co. 1.27% 152,748 $23.5M Reduce -62.5%
FICO Fair Isaac Corp. 0.70% 8,627 $12.9M Reduce -19.6%
IBIT iShares Bitcoin Trust ETF 0.67% 190,842 $12.4M New
PANW Palo Alto Networks Inc. 0.38% 34,452 $7.0M Add +162.1%
BRK.B Berkshire Hathaway Inc. Class B 0.36% 13,261 $6.7M Reduce -88.6%
TSLA Tesla Inc. 0.31% 13,020 $5.8M Add +10.3%
MCD McDonald's Corp. 0.31% 18,968 $5.8M Reduce -0.0%
ANET Arista Networks Inc. 0.27% 34,884 $5.1M New
GOOG Alphabet Inc. Class C 0.26% 19,661 $4.8M Reduce -2.3%
ADSK Autodesk Inc. 0.24% 14,074 $4.5M Reduce -4.0%
BRK.A Berkshire Hathaway Inc. Class A 0.20% 5 $3.8M No change
SCHW Schwab (charles) Corp. 0.18% 34,098 $3.3M Add +1.4%
WFC Wells Fargo & Co. 0.17% 37,085 $3.1M Add +101.8%
URTH iShares MSCI World ETF 0.16% 16,721 $3.0M Reduce -10.5%
IXUS iShares Core Intl Stock ETF 0.15% 33,188 $2.7M Add +30.2%
XOM Exxon Mobil Corp. 0.15% 24,225 $2.7M Add +10.2%
CVX Chevron Corp. 0.14% 16,801 $2.6M Add +76.2%
ABBV Abbvie Inc. 0.12% 9,517 $2.2M Add +4.6%
JNJ Johnson & Johnson 0.11% 11,385 $2.1M Add +0.8%
LLY Eli Lilly & Co. 0.11% 2,681 $2.0M Add +0.1%
SPY SS SPDR S&P 500 ETF Trust-US 0.10% 2,654 $1.8M Reduce -0.6%
CAT Caterpillar Inc. 0.08% 3,081 $1.5M Add +60.0%
MMM 3M Co. 0.07% 8,092 $1.3M Add +0.5%
CLX Clorox Company 0.06% 9,368 $1.2M Add +0.4%
ORCL Oracle Corp. 0.06% 3,836 $1.1M Add +181.4%
ISTB iShares Core 1-5 Year Usd Bo 0.06% 21,228 $1.0M Add +11.9%
MU Micron Technology Inc. 0.05% 5,976 $1000K Add +0.8%
IVV iShares Core S&P 500 ETF 0.05% 1,450 $970K Add +20.6%
QQQ Invesco QQQ Trust Series 1 0.05% 1,595 $958K Add +53.5%
RTX RTX Corp. 0.05% 5,563 $931K Add +24.0%
SCHI Schwab 5-10 Year Corporate B 0.04% 34,241 $790K Add +31.6%
MRK Merck & Co. Inc. 0.04% 9,270 $778K Add +3.4%
IGLB iShares 10+ Year Inv GR Corp. 0.04% 14,165 $730K Add +49.8%
ADP Automatic Data Processing 0.04% 2,478 $727K No change
CSCO Cisco Systems Inc. 0.04% 10,472 $716K Reduce -1.0%
BMY Bristol-Myers Squibb Co. 0.04% 14,715 $664K Add +0.7%
SYK Stryker Corp. 0.04% 1,791 $662K Reduce -2.7%
VOO Vanguard S&P 500 ETF 0.04% 1,057 $647K Add +78.8%
BAC Bank of America Corp. filed as BANK AMERICA CORP 0.03% 12,538 $647K Add +24.7%
BSX Boston Scientific Corp. 0.03% 6,446 $629K Reduce -98.3%
NTES Netease Inc.-ADR 0.03% 4,085 $621K Add +2.1%
ACN Accenture PLC Class A 0.03% 2,484 $613K Reduce -4.8%
CRM Salesforce Inc. 0.03% 2,518 $597K Add +52.4%
AMD Advanced Micro Devices 0.03% 3,499 $566K Reduce -16.8%
IT Gartner Inc. 0.03% 2,153 $566K New
VTI VG Morningstar TS MKT ETF-US 0.03% 1,652 $542K Reduce -17.7%
CL Colgate-Palmolive Co. 0.03% 6,699 $536K No change
COIN Coinbase Global Inc. Class A 0.03% 1,553 $524K Add +0.2%
HSBC HSBC Holdings PLC-Spons ADR filed as HSBC HLDGS PLC 0.03% 7,358 $522K Add +5.2%
INTU Intuit Inc. 0.03% 752 $513K Add +5.2%
C Citigroup Inc. 0.03% 4,894 $497K Add +6.0%
ITOT iShares Core S&P Total U.S. 0.03% 3,405 $496K No change
XYL Xylem Inc. 0.03% 3,313 $489K Add +1.9%
TMO Thermo Fisher Scientific Inc. 0.03% 996 $483K Add +8.5%
CW Curtiss-Wright Corp. 0.03% 888 $482K No change
ABT Abbott Laboratories 0.03% 3,531 $473K Add +1.9%
ADBE Adobe Inc. 0.02% 1,270 $448K Add +61.6%
HD Home Depot Inc. 0.02% 1,011 $410K No change
T AT&T Inc. 0.02% 14,043 $397K Add +14.6%
CRWD CrowdStrike Holdings Inc. Class A 0.02% 798 $391K New
SHOP Shopify Inc. Class A 0.02% 2,616 $389K Add +30.8%
SJM The JM Smucker Co. filed as SMUCKER J M CO 0.02% 3,556 $386K Add +0.5%
SCHX Schwab US Large-Cap ETF 0.02% 14,531 $383K Add +33.3%
IBM Intl Business Machines Corp. filed as INTERNATIONAL BUSINESS MACHS 0.02% 1,295 $365K Reduce -6.0%
IWF iShares Russell 1000 Growth 0.02% 766 $359K No change
NSC Norfolk Southern Corp. 0.02% 1,181 $355K No change
CMCSA Comcast Corp. Class A 0.02% 11,223 $353K Add +8.2%
FTNT Fortinet Inc. 0.02% 4,190 $352K New

Show all 129 holdings

Portfolio Sells Q2 2025 → Q3 2025
BRK.B Berkshire Hathaway Inc. Class B Reduce -88.6% 0.36% −3.15
PG The Procter & Gamble Co. Reduce -62.5% 1.27% −2.77
BSX Boston Scientific Corp. Reduce -98.3% 0.03% −2.52
SAP Sap SE-Sponsored ADR Sold out 0.00% −2.29
ISRG Intuitive Surgical Inc. Sold out 0.00% −2.01
CHKP Check Point Software Tech Sold out 0.00% −1.88
BABA Alibaba Group Holding-SP ADR Sold out 0.00% −1.62
FICO Fair Isaac Corp. Reduce -19.6% 0.70% −0.52
MCK McKesson Corp. Reduce -0.4% 2.88% −0.28
ADSK Autodesk Inc. Reduce -4.0% 0.24% −0.04
MCD McDonald's Corp. Reduce -0.0% 0.31% −0.03
URTH iShares MSCI World ETF Reduce -10.5% 0.16% −0.03
RELX Relx PLC - Spon ADR Sold out 0.00% −0.03
ACN Accenture PLC Class A Reduce -4.8% 0.03% −0.02
NOW ServiceNow Inc. Sold out 0.00% −0.01
ADI Analog Devices Inc. Reduce -30.7% 0.02% −0.01
SYK Stryker Corp. Reduce -2.7% 0.04% −0.01
VTI VG Morningstar TS MKT ETF-US Reduce -17.7% 0.03% −0.01
SPY SS SPDR S&P 500 ETF Trust-US Reduce -0.6% 0.10% −0.01
CSCO Cisco Systems Inc. Reduce -1.0% 0.04% −0.01
AMD Advanced Micro Devices Reduce -16.8% 0.03% −0.01
IBM Intl Business Machines Corp. Reduce -6.0% 0.02% −0.01
PEP Pepsico Inc. Reduce -10.1% 0.02% −0.00
DAL Delta Air Lines Inc. Reduce -6.5% 0.01% −0.00
GOOG Alphabet Inc. Class C Reduce -2.3% 0.26% +0.04
PLTR Palantir Technologies Inc. Class A Reduce -1.3% 4.49% +0.57

Portfolio Buys Q2 2025 → Q3 2025
ISCF iShares International Small New 3.32% +3.32
APH Amphenol Corp. Class A New 1.99% +1.99
BCS Barclays PLC-Spons ADR New 1.89% +1.89
MSFT Microsoft Corp. Add +77.6% 4.71% +1.77
CCJ Cameco Corp. New 1.65% +1.65
APO Apollo Global Management Inc. New 1.56% +1.56
TSM Taiwan Semiconductor-SP ADR Add +61.3% 3.33% +1.40
ASML ASML Holding NV-NY Reg SHS Add +131.1% 2.11% +1.24
AAPL Apple Inc. Add +19.3% 4.83% +1.07
HOOD Robinhood Markets Inc. Class A Add +0.5% 4.17% +1.04
GEV GE Vernova Inc. Add +76.2% 1.62% +0.71
GOOGL Alphabet Inc. Class A Add +0.8% 3.94% +0.68
IBIT iShares Bitcoin Trust ETF New 0.67% +0.67
META Meta Platforms Inc. Class A Add +40.1% 3.54% +0.61
AVGO Broadcom Inc. Add +12.9% 3.72% +0.55
ANET Arista Networks Inc. New 0.27% +0.27
PANW Palo Alto Networks Inc. Add +162.1% 0.38% +0.21
NVDA Nvidia Corp. Add +1.1% 6.06% +0.21
BKNG Booking Holdings Inc. Add +31.9% 1.80% +0.11
GLDM SPDR Gold Minishares Trust Add +4.1% 1.93% +0.10
TSLA Tesla Inc. Add +10.3% 0.31% +0.08
WFC Wells Fargo & Co. Add +101.8% 0.17% +0.08
AMZN Amazon.com Inc. Add +17.3% 3.12% +0.06
CVX Chevron Corp. Add +76.2% 0.14% +0.06
ORCL Oracle Corp. Add +181.4% 0.06% +0.04
CAT Caterpillar Inc. Add +60.0% 0.08% +0.03
IT Gartner Inc. New 0.03% +0.03
IXUS iShares Core Intl Stock ETF Add +30.2% 0.15% +0.03
CRWD CrowdStrike Holdings Inc. Class A New 0.02% +0.02
FTNT Fortinet Inc. New 0.02% +0.02
EBAY eBay Inc. New 0.02% +0.02
QQQ Invesco QQQ Trust Series 1 Add +53.5% 0.05% +0.02
IDXX Idexx Laboratories Inc. New 0.01% +0.01
VOO Vanguard S&P 500 ETF Add +78.8% 0.04% +0.01
ABBV Abbvie Inc. Add +4.6% 0.12% +0.01
KLAC KLA Corp. New 0.01% +0.01
INTC Intel Corp. New 0.01% +0.01
TDY Teledyne Technologies Inc. New 0.01% +0.01
SOXX iShares Semiconductor ETF New 0.01% +0.01
SYY Sysco Corp. New 0.01% +0.01
DDOG Datadog Inc. Class A New 0.01% +0.01
IGLB iShares 10+ Year Inv GR Corp. Add +49.8% 0.04% +0.01
PACB Pacific Biosciences of Calif New 0.01% +0.01
RTX RTX Corp. Add +24.0% 0.05% +0.01
MU Micron Technology Inc. Add +0.8% 0.05% +0.01
JNJ Johnson & Johnson Add +0.8% 0.11% +0.01
SHOP Shopify Inc. Class A Add +30.8% 0.02% +0.01
IVV iShares Core S&P 500 ETF Add +20.6% 0.05% +0.01
SCHI Schwab 5-10 Year Corporate B Add +31.6% 0.04% +0.01
ADBE Adobe Inc. Add +61.6% 0.02% +0.01

All Filings

QuarterPositions13F Reported ValueTop Holdings
Q2 2026 140$2.1BNVDA, MU, AAPL, GOOGL, TSM
Q1 2026 148$1.7BNVDA, AAPL, GOOGL, ISCF, TSM
Q4 2025 129$1.7BNVDA, GOOGL, MSFT, ISCF, AAPL
Q3 2025 129$1.9BNVDA, AAPL, MSFT, PLTR, HOOD
Q2 2025 115$1.6BNVDA, JPM, PG, PLTR, COST
Q1 2025 101$1.5BAAPL, PLTR, PG, V, AMZN
Q4 2024 110$1.6BAAPL, NVDA, PLTR, AMZN, PG
Q3 2024 109$1.6BNVDA, AAPL, PG, IWM, AMZN
Q2 2024 103$1.5BNVDA, AAPL, NVO, PG, MCK
Q1 2024 107$1.5BNVDA, IWM, NVO, AAPL, PG