Main Street Research LLC

In its 13F for Q1 2026 (holdings as of March 31, 2026, filed April 30, 2026), Main Street Research LLC reported 148 stock positions worth $1.7 billion. Its top holding was Nvidia (NVDA) at 6.3% of the portfolio, followed by Apple (AAPL, 6.0%) and Alphabet Class A (GOOGL, 5.2%). Compared with Q4 2025, it opened 30 new positions, sold out of 11, added to 76 and reduced 36. The biggest buy was a new position in Corning (GLW) and the biggest sale Robinhood Markets Class A (HOOD, shares −99%).

Most Recent 13F
Q2 2026
Location
SAUSALITO, CA
CIK
0001513211
Portfolio Value
$1.7B (Q1 2026)
SEC Filing
0001420506-26-000773 ↗ filed Apr 30, 2026

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 Q3 2025 Q4 2025: $1.7B Q4 2025 Q1 2026: $1.7B $1.7B Q1 2026 Q2 2026: $2.1B Q2 2026

Holdings 148 stocks · $1.7B
NVDA Nvidia Corp. 6.30% 620,776 $108.3M Add +4.2%
AAPL Apple Inc. 5.96% 403,578 $102.4M Add +38.7%
GOOGL Alphabet Inc. Class A 5.22% 311,786 $89.7M Add +4.8%
ISCF iShares International Small 4.76% 1,958,627 $81.9M Add +2.7%
TSM Taiwan Semiconductor-SP ADR 4.39% 223,159 $75.4M Add +2.3%
XBI SS SPDR S&P Biotech ETF 4.22% 567,479 $72.5M Add +57.4%
JPM JPMorgan Chase & Co. 3.83% 223,762 $65.8M Add +0.8%
AVGO Broadcom Inc. 3.83% 212,402 $65.7M Add +3.4%
MCK McKesson Corp. 3.41% 67,774 $58.6M Add +0.6%
AMZN Amazon.com Inc. 3.26% 269,193 $56.1M Add +3.6%
ASML ASML Holding NV-NY Reg SHS filed as ASML HLDG NV 3.20% 41,687 $55.1M Add +3.9%
GLW Corning Inc. 3.07% 387,718 $52.7M New
COST Costco Wholesale Corp. 2.68% 46,139 $46.0M Reduce -26.0%
JNJ Johnson & Johnson 2.66% 186,882 $45.7M Add +4.2%
EWY iShares MSCI South Korea ETF 2.59% 361,874 $44.5M Add +1.8%
GEV GE Vernova Inc. 2.57% 50,692 $44.2M Add +3.1%
GLDM SPDR Gold Minishares Trust 2.53% 469,451 $43.5M Add +1.5%
CAT Caterpillar Inc. 2.52% 61,110 $43.3M Add +2.6%
WMT Walmart Inc. 2.49% 344,869 $42.9M Add +1.9%
CCJ Cameco Corp. 2.46% 389,077 $42.3M Add +1.9%
META Meta Platforms Inc. Class A 2.36% 70,962 $40.6M Reduce -18.0%
APH Amphenol Corp. Class A 2.21% 301,043 $38.0M Add +1.9%
BHP BHP Group Ltd.-Spon ADR filed as BHP BILLITON LIMITED 2.20% 519,212 $37.8M New
AZN Astrazeneca PLC 2.19% 190,644 $37.6M Add +2.7%
MU Micron Technology Inc. 2.14% 109,109 $36.9M Add +1949.8%
RY Royal Bank of Canada 2.10% 222,568 $36.0M New
KEYS Keysight Technologies Inc. 1.86% 112,937 $31.9M New
MSFT Microsoft Corp. 1.45% 67,542 $25.0M Reduce -59.9%
PLTR Palantir Technologies Inc. Class A 1.43% 167,647 $24.5M Reduce -61.9%
PG The Procter & Gamble Co. 1.27% 151,627 $21.9M Add +0.4%
BCS Barclays PLC-Spons ADR 1.05% 850,971 $18.0M Reduce -49.4%
FICO Fair Isaac Corp. 0.53% 8,464 $9.0M Add +239.7%
IBIT iShares Bitcoin Trust ETF 0.44% 196,085 $7.5M Add +9.2%
GOOG Alphabet Inc. Class C 0.39% 23,437 $6.7M Add +16.6%
BRK.B Berkshire Hathaway Inc. Class B 0.33% 11,978 $5.7M Reduce -1.1%
PANW Palo Alto Networks Inc. 0.32% 34,024 $5.5M Add +157.1%
MCD McDonald's Corp. 0.28% 15,483 $4.8M Reduce -16.7%
TSLA Tesla Inc. 0.27% 12,337 $4.6M Reduce -3.2%
SCHW Schwab (charles) Corp. 0.25% 46,360 $4.4M Add +45.9%
ANET Arista Networks Inc. 0.25% 34,981 $4.3M New
XOM Exxon Mobil Corp. 0.24% 23,924 $4.1M Add +3.1%
WFC Wells Fargo & Co. 0.22% 46,882 $3.7M Add +136.2%
BRK.A Berkshire Hathaway Inc. Class A 0.21% 5 $3.6M No change
CVX Chevron Corp. 0.20% 16,851 $3.5M Add +77.0%
ADSK Autodesk Inc. 0.20% 14,403 $3.4M Add +0.8%
IXUS iShares Core Intl Stock ETF 0.19% 38,583 $3.3M Add +22.2%
V Visa Inc. Class A 0.18% 10,246 $3.1M Reduce -94.1%
LLY Eli Lilly & Co. 0.16% 2,908 $2.7M Add +104.9%
URTH iShares MSCI World ETF 0.15% 14,742 $2.7M Reduce -2.6%
ABBV Abbvie Inc. 0.13% 10,258 $2.2M Add +9.7%
SPY SS SPDR S&P 500 ETF Trust-US 0.12% 3,263 $2.1M Add +22.5%
IVV iShares Core S&P 500 ETF 0.10% 2,554 $1.7M Add +102.7%
CRM Salesforce Inc. 0.08% 6,924 $1.3M Add +8.8%
RTX RTX Corp. 0.07% 6,066 $1.2M Add +10.4%
ISTB iShares Core 1-5 Year Usd Bo 0.07% 24,058 $1.2M Add +5.7%
MRK Merck & Co. Inc. 0.07% 9,521 $1.1M Add +22.3%
MMM 3M Co. 0.07% 7,870 $1.1M Reduce -2.4%
DIS The Walt Disney Co. filed as DISNEY WALT CO 0.06% 10,730 $1.0M New
QQQ Invesco QQQ Trust Series 1 0.06% 1,769 $1.0M Add +31.5%
SCHI Schwab 5-10 Year Corporate B 0.06% 44,326 $1.0M Add +15.2%
UNP Union Pacific Corp. 0.06% 4,129 $1.0M Add +76.3%
CLX Clorox Company 0.06% 9,537 $988K Add +4.5%
IGLB iShares 10+ Year Inv GR Corp. 0.05% 18,751 $931K Add +17.6%
PHM Pultegroup Inc. 0.05% 7,382 $868K New
CRUS Cirrus Logic Inc. 0.05% 5,734 $829K New
UBER Uber Technologies Inc. 0.05% 11,491 $827K Reduce -97.4%
VOO Vanguard S&P 500 ETF 0.05% 1,332 $796K Add +159.7%
CSCO Cisco Systems Inc. 0.05% 10,057 $780K Add +3.9%
GLD SPDR Gold Shares 0.05% 1,806 $777K Add +162.1%
GS Goldman Sachs Group Inc. 0.04% 874 $739K New
DIA SS SPDR Dow Jones Indus Avg filed as STATE STR SPDR DOW JONES IND 0.04% 1,502 $696K Add +134.7%
CW Curtiss-Wright Corp. 0.04% 1,012 $689K Add +10.4%
TXN Texas Instruments Inc. 0.04% 3,527 $685K Add +91.5%
ON On Semiconductor 0.04% 10,350 $641K New
AMD Advanced Micro Devices 0.04% 3,145 $640K Reduce -8.1%
HSBC HSBC Holdings PLC-Spons ADR filed as HSBC HLDGS PLC 0.04% 7,733 $638K Add +0.5%
CL Colgate-Palmolive Co. 0.04% 7,484 $638K Add +13.1%
C Citigroup Inc. 0.04% 5,526 $627K Add +16.6%
BX Blackstone Inc. 0.04% 5,317 $611K New
T AT&T Inc. 0.03% 20,193 $585K Add +45.1%
BAC Bank of America Corp. filed as BANK AMERICA CORP 0.03% 11,943 $582K Add +7.4%
SYK Stryker Corp. 0.03% 1,763 $579K Reduce -4.3%
PEP Pepsico Inc. 0.03% 3,722 $578K Add +75.9%
DHI D.R. Horton Inc. 0.03% 3,808 $523K New
MUFG Mitsubishi Ufj Finl-Spon ADR 0.03% 30,448 $517K Add +0.8%
ORCL Oracle Corp. 0.03% 3,497 $514K Add +15.4%
ADI Analog Devices Inc. 0.03% 1,491 $474K Add +19.5%
NTES Netease Inc.-ADR 0.03% 4,085 $457K Add +2.1%
ADP Automatic Data Processing 0.03% 2,232 $453K Reduce -3.3%
TMO Thermo Fisher Scientific Inc. 0.03% 900 $442K Reduce -21.8%
LRCX Lam Research Corp. 0.02% 1,988 $425K Add +30.4%
BMY Bristol-Myers Squibb Co. 0.02% 6,942 $421K Reduce -52.5%
VTI VG Morningstar TS MKT ETF-US 0.02% 1,289 $414K Reduce -16.2%
XYL Xylem Inc. 0.02% 3,319 $397K Add +0.4%
ABT Abbott Laboratories 0.02% 3,859 $396K Add +5.6%
TT Trane Technologies PLC 0.02% 947 $395K No change
CMCSA Comcast Corp. Class A 0.02% 13,520 $388K Add +23.9%
ISRG Intuitive Surgical Inc. 0.02% 839 $387K Add +65.2%
EBAY eBay Inc. 0.02% 4,175 $380K Add +27.1%
BSX Boston Scientific Corp. 0.02% 5,993 $376K Reduce -0.5%
XLK SS Technology Select Sector 0.02% 2,800 $372K New
PTC PTC Inc. 0.02% 2,481 $354K New
LEN Lennar Corp. Class A 0.02% 3,904 $339K New
DAL Delta Air Lines Inc. 0.02% 5,091 $338K Add +6.8%
IT Gartner Inc. 0.02% 2,115 $335K New
ACN Accenture PLC Class A 0.02% 1,683 $334K Reduce -18.3%
FTNT Fortinet Inc. 0.02% 4,075 $333K New
INTU Intuit Inc. 0.02% 712 $308K Reduce -8.6%
TJX TJX Companies Inc. filed as TJX COS INC NEW 0.02% 1,919 $306K Add +22.8%
IWF iShares Russell 1000 Growth 0.02% 695 $296K Reduce -9.3%
SHOP Shopify Inc. Class A 0.02% 2,436 $289K Add +19.4%
LNG Cheniere Energy Inc. 0.02% 1,010 $287K New
SJM The JM Smucker Co. filed as SMUCKER J M CO 0.02% 2,858 $276K Reduce -14.2%
EXPE Expedia Group Inc. 0.02% 1,188 $274K Add +25.1%
SCHX Schwab US Large-Cap ETF 0.02% 10,635 $273K Add +8.1%
COIN Coinbase Global Inc. Class A 0.02% 1,550 $271K Reduce -0.1%
INTC Intel Corp. 0.02% 5,919 $261K Reduce -13.8%
KLAC KLA Corp. 0.02% 177 $261K Reduce -20.6%
COP Conocophillips 0.01% 1,950 $257K New
NFLX Netflix Inc. 0.01% 2,673 $257K Reduce -74.8%
SOXX iShares Semiconductor ETF 0.01% 771 $254K No change
SCHF Schwab Intl Equity ETF 0.01% 10,206 $253K Add +6.3%
NSC Norfolk Southern Corp. 0.01% 877 $252K Reduce -21.5%
IDXX Idexx Laboratories Inc. 0.01% 447 $251K New
MA Mastercard Inc. Class A 0.01% 493 $246K Add +0.4%
CRWD CrowdStrike Holdings Inc. Class A 0.01% 628 $245K New
ADBE Adobe Inc. 0.01% 1,005 $244K Add +30.4%
FNDX Schwab Fndmntl US LRG Co. ETF 0.01% 8,541 $238K Reduce -14.2%
AXP American Express Co. 0.01% 773 $234K Reduce -5.4%
PH Parker Hannifin Corp. 0.01% 261 $234K Reduce -10.6%
IYY iShares Dow Jones U.S. ETF 0.01% 1,446 $229K No change
IGM iShares Expanded Tech Sector 0.01% 1,932 $229K No change
HOOD Robinhood Markets Inc. Class A 0.01% 3,290 $228K Reduce -99.4%
HD Home Depot Inc. 0.01% 686 $226K Reduce -28.7%
TMUS T-Mobile US Inc. 0.01% 1,070 $225K Reduce -50.5%
ENTG Entegris Inc. 0.01% 1,852 $217K New
MTCH Match Group Inc. 0.01% 7,011 $215K New
COF Capital One Financial Corp. 0.01% 1,180 $215K Add +14.2%
NEE Nextera Energy Inc. 0.01% 2,266 $210K Reduce -18.9%
CI The Cigna Group 0.01% 771 $206K New
TDY Teledyne Technologies Inc. 0.01% 338 $204K New
PHG Koninklijke Philips NVR- NY 0.01% 7,420 $203K New
VRT Vertiv Holdings Co. Class A 0.01% 810 $203K New
COHR Coherent Corp. 0.01% 846 $202K New
PACB Pacific Biosciences of Calif 0.01% 152,100 $201K New
AON Aon PLC Class A 0.01% 622 $201K Reduce -24.2%
OMDA Omada Health Inc. 0.01% 15,909 $200K No change
TMC TMC the Metals Co. Inc. 0.00% 10,000 $47K New

Portfolio Sells Q4 2025 → Q1 2026
HOOD Robinhood Markets Inc. Class A Reduce -99.4% 0.01% −3.43
V Visa Inc. Class A Reduce -94.1% 0.18% −3.31
MSFT Microsoft Corp. Reduce -59.9% 1.45% −3.20
PLTR Palantir Technologies Inc. Class A Reduce -61.9% 1.43% −3.05
UBER Uber Technologies Inc. Reduce -97.4% 0.05% −2.04
IBN Icici Bank Ltd.-Spon ADR Sold out 0.00% −1.74
BCS Barclays PLC-Spons ADR Reduce -49.4% 1.05% −1.40
BKNG Booking Holdings Inc. Sold out 0.00% −1.17
META Meta Platforms Inc. Class A Reduce -18.0% 2.36% −0.91
COST Costco Wholesale Corp. Reduce -26.0% 2.68% −0.40
TSLA Tesla Inc. Reduce -3.2% 0.27% −0.06
MCD McDonald's Corp. Reduce -16.7% 0.28% −0.04
NFLX Netflix Inc. Reduce -74.8% 0.01% −0.04
VIG Vanguard Dividend Apprec ETF Sold out 0.00% −0.03
ITOT iShares Core S&P Total U.S. Sold out 0.00% −0.03
HUT Hut 8 Corp. Sold out 0.00% −0.02
BMY Bristol-Myers Squibb Co. Reduce -52.5% 0.02% −0.02
TRMB Trimble Inc. Sold out 0.00% −0.02
LIN Linde PLC Sold out 0.00% −0.01
BRK.B Berkshire Hathaway Inc. Class B Reduce -1.1% 0.33% −0.01
IBM Intl Business Machines Corp. Sold out 0.00% −0.01
GILD Gilead Sciences Inc. Sold out 0.00% −0.01
TMO Thermo Fisher Scientific Inc. Reduce -21.8% 0.03% −0.01
ACN Accenture PLC Class A Reduce -18.3% 0.02% −0.01
BN Brookfield Corp. Sold out 0.00% −0.01
TMUS T-Mobile US Inc. Reduce -50.5% 0.01% −0.01
INTU Intuit Inc. Reduce -8.6% 0.02% −0.01
HIMS Hims & Hers Health Inc. Sold out 0.00% −0.01
BSX Boston Scientific Corp. Reduce -0.5% 0.02% −0.01
ADP Automatic Data Processing Reduce -3.3% 0.03% −0.01
MMM 3M Co. Reduce -2.4% 0.07% −0.01
URTH iShares MSCI World ETF Reduce -2.6% 0.15% −0.01
HD Home Depot Inc. Reduce -28.7% 0.01% −0.01
VTI VG Morningstar TS MKT ETF-US Reduce -16.2% 0.02% −0.01
AON Aon PLC Class A Reduce -24.2% 0.01% −0.00
AMD Advanced Micro Devices Reduce -8.1% 0.04% −0.00
COIN Coinbase Global Inc. Class A Reduce -0.1% 0.02% −0.00
NSC Norfolk Southern Corp. Reduce -21.5% 0.01% −0.00
AXP American Express Co. Reduce -5.4% 0.01% −0.00
IWF iShares Russell 1000 Growth Reduce -9.3% 0.02% −0.00
SYK Stryker Corp. Reduce -4.3% 0.03% −0.00
SJM The JM Smucker Co. Reduce -14.2% 0.02% −0.00
FNDX Schwab Fndmntl US LRG Co. ETF Reduce -14.2% 0.01% −0.00
PH Parker Hannifin Corp. Reduce -10.6% 0.01% −0.00
NEE Nextera Energy Inc. Reduce -18.9% 0.01% −0.00
KLAC KLA Corp. Reduce -20.6% 0.02% −0.00
INTC Intel Corp. Reduce -13.8% 0.02% +0.00

Portfolio Buys Q4 2025 → Q1 2026
GLW Corning Inc. New 3.07% +3.07
BHP BHP Group Ltd.-Spon ADR New 2.20% +2.20
RY Royal Bank of Canada New 2.10% +2.10
MU Micron Technology Inc. Add +1949.8% 2.14% +2.06
KEYS Keysight Technologies Inc. New 1.86% +1.86
XBI SS SPDR S&P Biotech ETF Add +57.4% 4.22% +1.70
AAPL Apple Inc. Add +38.7% 5.96% +1.44
ASML ASML Holding NV-NY Reg SHS Add +3.9% 3.20% +0.75
GEV GE Vernova Inc. Add +3.1% 2.57% +0.74
EWY iShares MSCI South Korea ETF Add +1.8% 2.59% +0.61
TSM Taiwan Semiconductor-SP ADR Add +2.3% 4.39% +0.59
CAT Caterpillar Inc. Add +2.6% 2.52% +0.57
JNJ Johnson & Johnson Add +4.2% 2.66% +0.54
CCJ Cameco Corp. Add +1.9% 2.46% +0.46
WMT Walmart Inc. Add +1.9% 2.49% +0.33
FICO Fair Isaac Corp. Add +239.7% 0.53% +0.28
GLDM SPDR Gold Minishares Trust Add +1.5% 2.53% +0.27
ANET Arista Networks Inc. New 0.25% +0.25
MCK McKesson Corp. Add +0.6% 3.41% +0.25
ISCF iShares International Small Add +2.7% 4.76% +0.24
AZN Astrazeneca PLC Add +2.7% 2.19% +0.24
PANW Palo Alto Networks Inc. Add +157.1% 0.32% +0.18
CVX Chevron Corp. Add +77.0% 0.20% +0.12
WFC Wells Fargo & Co. Add +136.2% 0.22% +0.11
XOM Exxon Mobil Corp. Add +3.1% 0.24% +0.08
SCHW Schwab (charles) Corp. Add +45.9% 0.25% +0.07
LLY Eli Lilly & Co. Add +104.9% 0.16% +0.07
DIS The Walt Disney Co. New 0.06% +0.06
PHM Pultegroup Inc. New 0.05% +0.05
CRUS Cirrus Logic Inc. New 0.05% +0.05
IVV iShares Core S&P 500 ETF Add +102.7% 0.10% +0.05
GS Goldman Sachs Group Inc. New 0.04% +0.04
IXUS iShares Core Intl Stock ETF Add +22.2% 0.19% +0.04
ON On Semiconductor New 0.04% +0.04
PG The Procter & Gamble Co. Add +0.4% 1.27% +0.04
BX Blackstone Inc. New 0.04% +0.04
GOOG Alphabet Inc. Class C Add +16.6% 0.39% +0.03
DHI D.R. Horton Inc. New 0.03% +0.03
GLD SPDR Gold Shares Add +162.1% 0.05% +0.03
VOO Vanguard S&P 500 ETF Add +159.7% 0.05% +0.03
UNP Union Pacific Corp. Add +76.3% 0.06% +0.03
DIA SS SPDR Dow Jones Indus Avg Add +134.7% 0.04% +0.02
XLK SS Technology Select Sector New 0.02% +0.02
TXN Texas Instruments Inc. Add +91.5% 0.04% +0.02
PTC PTC Inc. New 0.02% +0.02
LEN Lennar Corp. Class A New 0.02% +0.02
IT Gartner Inc. New 0.02% +0.02
FTNT Fortinet Inc. New 0.02% +0.02
MRK Merck & Co. Inc. Add +22.3% 0.07% +0.02
SPY SS SPDR S&P 500 ETF Trust-US Add +22.5% 0.12% +0.02

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