SEC 13F Intelligence

Managers / Q1 2026

Main Street Research LLC

CIK 0001513211 · 342 MAIN STREET, LAKEVILLE, CT, 06039 · 860-435-2350

Reported Value
$1.7B
Q1 2026
Positions
148
Filings on Record
30
2019–present window
Filed
Apr 30, 2026
original filing

Summary

Main Street Research Llc reported $1.7B in U.S.-listed holdings across 148 positions for Q1 2026.

Its largest position, NVDA, represents 6.3% of the portfolio.

Compared with Q4 2025, the fund opened 31 new positions and exited 12.

Reported Value by Quarter

13F Reported Value
Q4 ’18: $257MQ4 ’18Q1 ’19: $315MQ2 ’19: $444MQ3 ’19: $533MQ4 ’19: $634MQ4 ’19Q1 ’20: $408MQ2 ’20: $637MQ3 ’20: $785MQ4 ’20: $930MQ4 ’20Q1 ’21: $1.1BQ2 ’21: $1.2BQ3 ’21: $1.1BQ4 ’21: $1.3BQ4 ’21Q1 ’22: $1.1BQ2 ’22: $381MQ3 ’22: $454MQ4 ’22: $410.7BQ4 ’22Q1 ’23: $506MQ2 ’23: $627MQ3 ’23: $971MQ4 ’23: $1.2BQ4 ’23Q1 ’24: $1.5BQ2 ’24: $1.5BQ3 ’24: $1.6BQ4 ’24: $1.6BQ4 ’24Q1 ’25: $1.5BQ2 ’25: $1.6BQ3 ’25: $1.9BQ4 ’25: $1.7BQ4 ’25Q1 ’26: $1.7Bfilingsflow.com

Portfolio Composition

By security type
Common Stock: 71.2%ETP: 15.6%ADR: 7.7%Other: 5.4%NY Reg Shrs: 0.0%
  • Common Stock · 71.2% · $1.2B
  • ETP · 15.6% · $269M
  • ADR · 7.7% · $133M
  • Other · 5.4% · $94M
  • NY Reg Shrs · 0.0% · $203,308

Quarter-over-Quarter Changes full breakdown →

Holdings — Q1 2026

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#IssuerClass% PortfolioValue ↓Shares

Filing History

QuarterReported ValuePositionsFiledTypeLinks
Q1 2026$1.7B148Apr 30, 202613F-HRchanges · EDGAR ↗
Q4 2025$1.7B129Feb 9, 202613F-HRchanges · EDGAR ↗
Q3 2025$1.9B129Nov 13, 202513F-HRchanges · EDGAR ↗
Q2 2025$1.6B115Aug 5, 202513F-HRchanges · EDGAR ↗
Q1 2025$1.5B101Apr 30, 202513F-HRchanges · EDGAR ↗
Q4 2024$1.6B110Feb 7, 202513F-HRchanges · EDGAR ↗
Q3 2024$1.6B109Nov 12, 202413F-HRchanges · EDGAR ↗
Q2 2024$1.5B103Jul 29, 202413F-HRchanges · EDGAR ↗
Q1 2024$1.5B107May 1, 202413F-HRchanges · EDGAR ↗
Q4 2023$1.2B106Jan 30, 202413F-HRchanges · EDGAR ↗
Q3 2023$971M91Nov 3, 202313F-HRchanges · EDGAR ↗
Q2 2023$627M93Aug 8, 202313F-HRchanges · EDGAR ↗
Q1 2023$506M91May 1, 202313F-HRchanges · EDGAR ↗
Q4 2022$410.7B98Feb 6, 202313F-HRchanges · EDGAR ↗
Q3 2022$454M97Nov 14, 202213F-HRchanges · EDGAR ↗
Q2 2022$381M86Aug 12, 202213F-HRchanges · EDGAR ↗
Q1 2022$1.1B116May 5, 202213F-HRchanges · EDGAR ↗
Q4 2021$1.3B141Feb 9, 202213F-HRchanges · EDGAR ↗
Q3 2021$1.1B137Nov 12, 202113F-HRchanges · EDGAR ↗
Q2 2021$1.2B143Aug 6, 202113F-HRchanges · EDGAR ↗
Q1 2021$1.1B127May 7, 202113F-HRchanges · EDGAR ↗
Q4 2020$930M126Feb 12, 202113F-HRchanges · EDGAR ↗
Q3 2020$785M109Nov 10, 202013F-HRchanges · EDGAR ↗
Q2 2020$637M97Jul 29, 202013F-HRchanges · EDGAR ↗
Q1 2020$408M78May 1, 202013F-HRchanges · EDGAR ↗
Q4 2019$634M106Jan 28, 202013F-HRchanges · EDGAR ↗
Q3 2019$533M94Oct 21, 201913F-HRchanges · EDGAR ↗
Q2 2019$444M91Aug 8, 201913F-HRchanges · EDGAR ↗
Q1 2019$315M90May 13, 201913F-HRchanges · EDGAR ↗
Q4 2018$257M76Feb 13, 201913F-HRchanges · EDGAR ↗

13F filings are due up to 45 days after quarter end, so holdings shown here lag the fund’s current book. Source: original SEC filing on EDGAR ↗.