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SEC Form 13F

Main Street Research LLC 13F Holdings

Inspect Main Street Research LLC's 2026-06-30 SEC 13F positions, public filing date, amendments and original receipt.

As of 2026-07-30T03:59:59.999Z

Report period
2026-06-30
Publicly available
2026-07-30
Reported value
$2,118,491,302
Positions
140
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Disclosed positions

Largest disclosed position values

Scale: 0 to 126,070,000 USD · zero baseline

Largest disclosed position values

  • NVDA · COM+126,067,297 USD
  • MU · COM+125,397,358 USD
  • AAPL · COM+117,517,404 USD
  • GOOGL · CAP STK CL A+113,267,393 USD
  • TSM · SPONSORED ADS+109,090,838 USD
  • GLW · COM+100,654,235 USD
  • XBI · ST STR SP BIOT+91,271,321 USD
  • ISCF · INTERNATIONAL SL+87,764,241 USD
  • ASML · N Y REGISTRY SHS+84,344,300 USD
  • AVGO · COM+80,778,363 USD

Reported underlying-position values for 2026-06-30, publicly available 2026-07-30. Put/call values are not option premiums; this subset is not a complete portfolio allocation. Exact issuer, class and unit remain in the table. Showing the first 10 of 50 recorded values; the complete table remains available below.

Inspect all 50 displayed rows: Disclosed positions

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NVIDIA CORPORATIONNVDACOM$126,067,297630,053SHNone
MICRON TECHNOLOGY INCMUCOM$125,397,358108,636SHNone
APPLE INCAAPLCOM$117,517,404406,129SHNone
ALPHABET INCGOOGLCAP STK CL A$113,267,393316,947SHNone
TAIWAN SEMICONDUCTOR MANUFACTSMSPONSORED ADS$109,090,838228,429SHNone
CORNING INCGLWCOM$100,654,235394,058SHNone
SPDR SERIES TRUSTXBIST STR SP BIOT$91,271,321576,754SHNone
ISHARES TRISCFINTERNATIONAL SL$87,764,2412,027,356SHNone
ASML HLDG NVASMLN Y REGISTRY SHS$84,344,30042,396SHNone
BROADCOM INCAVGOCOM$80,778,363213,841SHNone
JPMORGAN CHASE & COJPMCOM$74,074,475226,299SHNone
ISHARES INCEWYMSCI STH KOR ETF$72,858,644360,865SHNone
CATERPILLAR INCCATCOM$65,767,15961,759SHNone
AMAZON COM INCAMZNCOM$65,480,981274,738SHNone
GE VERNOVA INCGEVCOM$59,685,39950,802SHNone
AMPHENOL CORPAPHCL A$54,432,855308,716SHNone
JOHNSON & JOHNSONJNJCOM$47,908,843188,640SHNone
ROYAL BK CDARYCOM$47,010,338227,136SHNone
COSTCO WHOLESALE CORPORATIONCOSTCOM$44,432,46847,497SHNone
BHP BILLITON LIMITEDBHPSPONSORED ADS$43,991,929528,051SHNone
BARCLAYS PLCBCSADR$43,553,2241,621,490SHNone
META PLATFORMS INCMETACL A$40,662,49072,187SHNone
KEYSIGHT TECHNOLOGIES INCKEYSCOM$40,295,858115,108SHNone
CAMECO CORPCCJCOM$39,881,144391,529SHNone
WALMART INCWMTCOM$39,488,132348,650SHNone
ASTRAZENECA PLCAZNORD$37,434,212197,417SHNone
ROSS STORES INCROSTCOM$32,088,202150,755SHNone
TECHNIPFMC PLCFTICOM$27,425,459413,657SHNone
MICROSOFT CORPMSFTCOM$25,806,27869,182SHNone
PROCTER & GAMBLE COPGCOM$22,153,275151,073SHNone
MCKESSON CORPMCKCOM$21,516,02828,475SHNone
FAIR ISAAC CORPFICOCOM$11,445,9929,580SHNone
ALPHABET INCGOOGCAP STK CL C$8,022,97022,707SHNone
PALO ALTO NETWORKS INCPANWCOM$7,960,43023,343SHNone
BERKSHIRE HATHAWAY INC DELBRK.BCL B NEW$5,994,67211,980SHNone
ARISTA NETWORKS INCANETCOM SHS$5,935,09834,937SHNone
TESLA INCTSLACOM$5,444,02612,943SHNone
SCHWAB CHARLES CORPSCHWCOM$4,234,03045,887SHNone
WELLS FARGO & COWFCCOM$4,011,51148,542SHNone
BERKSHIRE HATHAWAY INC DELBRK.ACL A$3,744,2505SHNone
ISHARES TRIXUSCORE MSCI TOTAL$3,729,12739,073SHNone
ELI LILLY & COLLYCOM$3,293,3892,746SHNone
VISA INCVCOM CL A$3,214,4549,369SHNone
EXXON MOBIL CORPXOMCOM$3,067,58722,437SHNone
AUTODESK INCADSKCOM$2,768,54114,240SHNone
ISHARES INCURTHMSCI WORLD ETF$2,737,86913,511SHNone
CHEVRON CORPORATIONCVXCOM$2,665,48816,080SHNone
STATE STR SPDR S&P 500 ETF TSPYTR UNIT$2,602,4933,485SHNone
ABBVIE INCABBVCOM$2,446,0869,721SHNone
MCDONALDS CORPMCDCOM$2,409,2448,913SHNone

Largest 50 positions by reported value; the filing may contain more positions.

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NVIDIA CORPORATIONNVDACOM$126,067,297630,053SHNone

First displayed source row from Disclosed positions. The full bounded history and coverage notes remain below.

The displayed observation date is 2026-06-30 and its public availability date is 2026-07-30. Subtracting those calendar dates gives 30 days of disclosure lag. Historical public research can use the record from the availability date, rather than backdating knowledge to the observation date. The calendar-day difference does not assert an intraday publication time.

Read the amount together with its Unit and Option columns. A reported put or call position is not an option premium paid, and a quarterly holding is not a purchase made on its public filing date. Check every accession in the effective amendment lineage below: a retained holding can originate in an earlier filing rather than the latest linked amendment.

Open the linked original receipts to verify the row, then inspect a second record before drawing a pattern. This public filing observation supplies source evidence, not a completed copy-trading return.

How amendments affect these holdings

This view uses 1 effective filing version(s). A restatement replaces the previous book; a new-holdings amendment adds positions. 0 positions lack a resolved ticker and 0 positions are put or call entries.

The displayed holdings combine the effective filing versions listed here. The latest receipt linked below identifies the current projection version; it is not proof that every retained holding originated in that latest amendment. Inspect all effective accessions when verifying a position's source.

A 13F is a delayed quarterly snapshot of disclosed holdings. It is not a complete trade ledger and does not reveal every position in a manager's portfolio. Option values refer to the reported underlying position rather than a traded option premium.

Show the table · 1 row, 2 columns
Effective SEC accessionRole in this view
0001420506-26-001335Latest effective version

Quarter end and public filing date

Use the filing's public availability date when constructing a historical observation. The quarter-end report period is earlier and cannot be substituted for when the public learned the holdings.