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Super Investors Main Street Research LLC
MS

Main Street Research LLC

Quarterly 13F snapshot: US-listed longs only, no performance figures — 13F data cannot support them.

Portfolio value
$2.12B
Positions
140
Quarter ended
June 30, 2026
Filed
July 29, 2026

Reported portfolio value by quarter (53 quarters reported)

$2.12B $257M
Q2 13 Q1 16 Q4 18 Q3 21 Q2 24 Q2 26

$331M in Q2 2013 → $2.12B now. Hover for any quarter.

Holdings

As reported for the quarter ended June 30, 2026. Activity is the change in share count since the prior quarter's filing.

Holding % of portfolio Activity Shares Value
Nvidia Corporation 6.0% Added 1.5% 630,053 $126M
Micron Technology Inc 5.9% Trimmed 0.4% 108,636 $125M
Apple Inc 5.5% Added 0.6% 406,129 $118M
Alphabet Inc 5.3% Added 1.7% 316,947 $113M
TS Taiwan Semiconductor Manufac 5.1% Added 2.4% 228,429 $109M
Corning Inc 4.8% Added 1.6% 394,058 $101M
SS SPDR Series Trust 4.3% Added 1.6% 576,754 $91.3M
IT Ishares Tr 4.1% Added 3.5% 2,027,356 $87.8M
AH Asml Hldg Nv 4.0% Added 1.7% 42,396 $84.3M
Broadcom Inc 3.8% Added 0.7% 213,841 $80.8M
Jpmorgan Chase & Co 3.5% Added 1.1% 226,299 $74.1M
I Ishares Inc 3.4% Trimmed 0.3% 360,865 $72.9M
Caterpillar Inc 3.1% Added 1.1% 61,759 $65.8M
Amazon Com Inc 3.1% Added 2.1% 274,738 $65.5M
Ge Vernova Inc 2.8% Added 0.2% 50,802 $59.7M
Amphenol Corp 2.6% Added 2.5% 308,716 $54.4M
Johnson & Johnson 2.3% Added 0.9% 188,640 $47.9M
RB Royal Bk Cda 2.2% Added 2.1% 227,136 $47M
Costco Wholesale Corporation 2.1% Added 2.9% 47,497 $44.4M
BB Bhp Billiton Limited 2.1% Added 1.7% 528,051 $44M
Barclays PLC 2.1% Added 91% 1,621,490 $43.6M
Meta Platforms Inc 1.9% Added 1.7% 72,187 $40.7M
Keysight Technologies Inc 1.9% Added 1.9% 115,108 $40.3M
Cameco Corp 1.9% Added 0.6% 391,529 $39.9M
Walmart Inc 1.9% Added 1.1% 348,650 $39.5M
Astrazeneca PLC 1.8% Added 3.6% 197,417 $37.4M
Ross Stores Inc 1.5% New 150,755 $32.1M
Technipfmc PLC 1.3% New 413,657 $27.4M
Microsoft Corp 1.2% Added 2.4% 69,182 $25.8M
Procter & Gamble Co 1.0% Trimmed 0.4% 151,073 $22.2M
Mckesson Corp 1.0% Trimmed 58% 28,475 $21.5M
Fair Isaac Corp 0.5% Added 13% 9,580 $11.4M
Alphabet Inc 0.4% Trimmed 3.1% 22,707 $8.02M
Palo Alto Networks Inc 0.4% Trimmed 31% 23,343 $7.96M
BH Berkshire Hathaway Inc Del 0.3% Added 0.0% 11,980 $5.99M
Arista Networks Inc 0.3% Trimmed 0.1% 34,937 $5.94M
Tesla Inc 0.3% Added 4.9% 12,943 $5.44M
SC Schwab Charles Corp 0.2% Trimmed 1.0% 45,887 $4.23M
Wells Fargo & Co 0.2% Added 3.5% 48,542 $4.01M
BH Berkshire Hathaway Inc Del 0.2% Unchanged 5 $3.74M
IT Ishares Tr 0.2% Added 1.3% 39,073 $3.73M
EL Eli Lilly & Co 0.2% Trimmed 5.6% 2,746 $3.29M
Visa Inc 0.2% Trimmed 8.6% 9,369 $3.21M
Exxon Mobil Corp 0.1% Trimmed 6.2% 22,437 $3.07M
Autodesk Inc 0.1% Trimmed 1.1% 14,240 $2.77M
I Ishares Inc 0.1% Trimmed 8.4% 13,511 $2.74M
Chevron Corporation 0.1% Trimmed 4.6% 16,080 $2.67M
SS State Str SPDR S&P 500 ETF T 0.1% Added 6.8% 3,485 $2.6M
Abbvie Inc 0.1% Trimmed 5.2% 9,721 $2.45M
M Mcdonalds Corp 0.1% Trimmed 42% 8,913 $2.41M
Advanced Micro Devices Inc 0.1% Added 5.2% 3,308 $1.92M
IT Ishares Tr 0.1% Trimmed 29% 1,810 $1.36M
Palantir Technologies Inc 0.1% Trimmed 93% 11,444 $1.34M
3m Co 0.1% Trimmed 3.3% 7,610 $1.23M
IT Ishares Tr 0.1% Added 2.2% 24,592 $1.19M
CS Cisco Sys Inc 0.1% Trimmed 3.7% 9,682 $1.14M
IQ Invesco Qqq Tr 0.1% Trimmed 13% 1,531 $1.13M
Rtx Corporation 0.1% Trimmed 5.2% 5,752 $1.09M
Merck & Co Inc 0.1% Trimmed 13% 8,298 $1.07M
TI Texas Instrs Inc 0.1% Added 0.9% 3,560 $1.06M

Showing top 60 of 140 positions.

Timeline of changes

What changed each quarter, from the filings' own share counts. Largest moves first; most recent 8 quarters.

Q2 2026

quarter ended June 30, 2026 · filed July 29, 2026

Company Action Shares changed Value of change % of portfolio
WG World Gold Tr Exited −469,451 −$43.5M —
Ross Stores Inc New +150,755 +$32.1M 1.5%
Mckesson Corp Trimmed −39,299 −$29.7M 1.0%
Technipfmc PLC New +413,657 +$27.4M 1.3%
Barclays PLC Added +770,519 +$20.7M 2.1%
Palantir Technologies Inc Trimmed −156,203 −$18.2M 0.1%
IB Ishares Bitcoin Trust ETF Exited −196,085 −$7.53M —
Palo Alto Networks Inc Trimmed −10,681 −$3.64M 0.4%
IT Ishares Tr Added +68,729 +$2.98M 4.1%
TS Taiwan Semiconductor Manufac Added +5,270 +$2.52M 5.1%

Showing the 10 largest of 152 changes.

Q1 2026

quarter ended March 31, 2026 · filed April 30, 2026

Company Action Shares changed Value of change % of portfolio
Corning Inc New +387,718 +$52.7M 3.1%
Visa Inc Trimmed −163,842 −$49.5M 0.2%
Palantir Technologies Inc Trimmed −272,603 −$39.9M 1.4%
BB Bhp Billiton Limited New +519,212 +$37.8M 2.2%
Astrazeneca PLC New +190,644 +$37.6M 2.2%
Microsoft Corp Trimmed −100,665 −$37.3M 1.5%
RM Robinhood Mkts Inc Trimmed −529,109 −$36.7M —
RB Royal Bk Cda New +222,568 +$36M 2.1%
Micron Technology Inc Added +103,786 +$35.1M 2.1%
Astrazeneca PLC Exited −371,217 −$34.1M —

Showing the 10 largest of 154 changes.

Q4 2025

quarter ended December 31, 2025 · filed February 09, 2026

Company Action Shares changed Value of change % of portfolio
SS SPDR Series Trust New +360,526 +$44M 2.5%
Mercadolibre Inc Exited −15,833 −$37M —
T-mobile Us Inc Trimmed −178,159 −$36.2M —
Spotify Technology S A Exited −50,422 −$35.2M —
Johnson & Johnson Added +167,933 +$34.8M 2.1%
I Ishares Inc New +355,461 +$34.6M 2.0%
Astrazeneca PLC New +371,217 +$34.1M 2.0%
Caterpillar Inc Added +56,478 +$32.4M 2.0%
Linde PLC Trimmed −72,768 −$31M —
Trane Technologies PLC Trimmed −77,663 −$30.2M —

Showing the 10 largest of 136 changes.

Q3 2025

quarter ended September 30, 2025 · filed November 13, 2025

Company Action Shares changed Value of change % of portfolio
IT Ishares Tr New +1,495,000 +$61.5M 3.3%
BH Berkshire Hathaway Inc Del Trimmed −102,920 −$51.7M 0.4%
PA Procter And Gamble Co Trimmed −254,164 −$39.1M 1.3%
Microsoft Corp Added +73,462 +$38M 4.7%
AN Amphenol Corp New New +297,311 +$36.8M 2.0%
Sap Se Exited −120,723 −$36.7M —
Boston Scientific Corp Trimmed −374,847 −$36.6M —
Barclays PLC New +1,694,985 +$35M 1.9%
Intuitive Surgical Inc Exited −59,513 −$32.3M —
Cameco Corp New +364,392 +$30.6M 1.7%

Showing the 10 largest of 116 changes.

Q2 2025

quarter ended June 30, 2025 · filed August 05, 2025

Company Action Shares changed Value of change % of portfolio
Palantir Technologies Inc Trimmed −444,201 −$60.6M 3.9%
RM Robinhood Mkts Inc New +536,736 +$50.3M 3.1%
Oracle Corp Trimmed −216,226 −$47.3M —
Uber Technologies Inc New +449,335 +$41.9M 2.6%
Spotify Technology S A New +49,819 +$38.2M 2.4%
Caterpillar Inc Trimmed −96,636 −$37.5M —
CS Cisco Sys Inc Trimmed −519,719 −$36.1M —
Trane Technologies PLC New +76,349 +$33.4M 2.1%
Parker-hannifin Corp Exited −54,903 −$33.4M —
Walmart Inc Added +322,903 +$31.6M 2.0%

Showing the 10 largest of 118 changes.

Q1 2025

quarter ended March 31, 2025 · filed April 30, 2025

Company Action Shares changed Value of change % of portfolio
IT Ishares Tr Exited −282,358 −$62.4M —
Netflix Inc Added +41,305 +$38.5M 2.5%
Boston Scientific Corp Added +365,180 +$36.8M 2.5%
Ingersoll Rand Inc Exited −365,501 −$33.1M —
RF Regions Financial Corp New Exited −1,388,068 −$33M —
Chubb Limited Exited −118,621 −$32.9M —
Sap Se New +119,768 +$32.2M 2.1%
CS Cisco Sys Inc Added +519,298 +$32M 2.1%
Arista Networks Inc Exited −285,740 −$31.6M —
Constellation Energy Corp Exited −140,786 −$31.5M —

Showing the 10 largest of 115 changes.

Q4 2024

quarter ended December 31, 2024 · filed February 07, 2025

Company Action Shares changed Value of change % of portfolio
NA Novo-nordisk A S Trimmed −376,265 −$32.4M 0.5%
Arista Networks Inc New +285,740 +$31.6M 2.0%
Totalenergies Se Exited −346,162 −$22.7M —
Nvidia Corporation Trimmed −166,891 −$22.4M 5.2%
Adobe Inc Trimmed −45,664 −$20.3M —
Servicenow Inc Added +16,421 +$17.4M 2.2%
Mercadolibre Inc Added +8,099 +$13.8M 1.6%
AH Asml Holding N V Trimmed −19,030 −$13.2M —
General Dynamics Corp Trimmed −49,161 −$13M 0.8%
Intuit Trimmed −19,965 −$12.5M 0.8%

Showing the 10 largest of 103 changes.

Q3 2024

quarter ended September 30, 2024 · filed November 12, 2024

Company Action Shares changed Value of change % of portfolio
Broadcom Inc Added +222,520 +$38.4M 2.7%
Palantir Technologies Inc New +892,801 +$33.2M 2.1%
IT Ishares Tr Added +113,634 +$25.1M 3.8%
SC Schwab Charles Corp Trimmed −365,533 −$23.7M 0.1%
Advanced Micro Devices Inc Trimmed −105,253 −$17.3M 1.2%
Mckesson Corp Trimmed −33,982 −$16.8M 2.1%
AM Applied Matls Inc Trimmed −78,312 −$15.8M 1.0%
Servicenow Inc New +16,316 +$14.6M 0.9%
AH Asml Holding N V Trimmed −17,381 −$14.5M 1.0%
Mercadolibre Inc New +6,923 +$14.2M 0.9%

Showing the 10 largest of 103 changes.

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