Main Street Research LLC

Q2 2026 13F-HR Holdings

Location
Sausalito, CA
Holdings as of
6/30/2026
Date filed
7/29/2026
Form type
13F-HR
Num holdings
140
Total value ($000)
$2,118,491
Net value change ($000)
+399,963 (23.3%)
New positions
13
Sold out positions
21
Turnover %
5.7%
Sector allocation + QoQ delta (equities-only)
Prev filing: 4/30/2026 Next filing: — SEC filing

Snapshot: Change Analysis

Compared to Q1 2026
Methodology: sector metrics are equities-only; instrument mix chart is ex-options; options exposure is shown separately. Why this matters.
Top Adds (Value $000, Stocks/ETFs)
MU 88,536 240.2%
GLW 47,936 90.9%
TSM 33,674 44.7%
ROST 32,088 NEW
ASML 29,283 53.2%
EWY 28,345 63.7%
FTI 27,425 NEW
BCS 25,546 141.9%
GOOGL 23,610 26.3%
CAT 22,473 51.9%
Top Reduces (Value $000, Stocks/ETFs)
GLDM -43,513 -100.0%
MCK -37,133 -63.3%
PLTR -23,188 -94.6%
IBIT -7,534 -100.0%
WMT -3,372 -7.9%
MCD -2,403 -49.9%
CCJ -2,377 -5.6%
COST -1,542 -3.4%
DIS -1,034 -100.0%
XOM -991 -24.4%
Instrument mix + QoQ Δ (ex-options)
How this table is calculated: SEC VALUE ($000) is used as reported. For derivatives (PUT/CALL/WARRANT/RIGHT), SEC value represents reported underlying exposure, not premium cash paid/received. Column % is bucket-based: non-options share is calculated inside non-option total, options share is calculated inside options total. Details.
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Instrument:
Issuer Name Ticker Sector Industry Class History Value ($000) % Shares Shares Δ Shares Δ% Value Δ ($000) Value Δ% Principal Option Type