S&CO INC

Q4 2025 13F-HR Holdings

Location
Boston, MA
Holdings as of
12/31/2025
Date filed
2/5/2026
Form type
13F-HR
Num holdings
218
Total value ($000)
$1,609,907
Net value change ($000)
-23,634 (-1.4%)
New positions
8
Sold out positions
12
Turnover %
4.3%
Sector allocation + QoQ delta (equities-only)
Prev filing: 11/6/2025 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)
LLYVA 14,683 NEW
MRK 9,328 26.3%
GOOGL 8,323 28.9%
CAT 6,900 12.9%
GOOGL 6,568 28.2%
LLY 6,437 42.1%
FANG 4,705 NEW
AAPL 3,973 6.7%
LLYVA 3,875 NEW
TMO 3,765 18.3%
Top Reduces (Value $000, Stocks/ETFs)
LLYVA -17,164 -100.0%
MOS -13,849 -37.1%
FMC -12,470 -100.0%
CCJ -10,795 -24.9%
ADP -8,284 -13.7%
OXY -4,966 -100.0%
PROSY -4,817 -13.4%
LLYVA -4,571 -100.0%
LBRDA -4,123 -41.3%
MSFT -3,501 -4.0%
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