Main Street Research LLC

Q4 2025 13F-HR Holdings

Location
Sausalito, CA
Holdings as of
12/31/2025
Date filed
2/9/2026
Form type
13F-HR
Num holdings
129
Total value ($000)
$1,748,176
Net value change ($000)
-102,647 (-5.5%)
New positions
17
Sold out positions
17
Turnover %
13.0%
Sector allocation + QoQ delta (equities-only)
Prev filing: 11/13/2025 Next filing: — SEC filing

Snapshot: Change Analysis

Compared to Q3 2025
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)
XBI 43,959 NEW
JNJ 34,999 1657.9%
EWY 34,558 NEW
AZN 34,126 NEW
CAT 32,650 2221.1%
GOOGL 20,239 27.8%
ISCF 17,654 28.7%
BCS 7,793 22.2%
TSM 4,779 7.7%
CCJ 4,379 14.3%
Top Reduces (Value $000, Stocks/ETFs)
NFLX -50,464 -98.1%
TMUS -42,726 -99.0%
MELI -37,001 -100.0%
SPOT -35,195 -100.0%
LIN -34,594 -99.3%
TT -32,801 -98.9%
APO -28,929 -100.0%
HOOD -17,004 -22.0%
BKNG -12,866 -38.7%
AAPL -10,361 -11.6%
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