S&CO INC

Q3 2026 13F-HR Holdings

Location
Boston, MA
Holdings as of
9/30/2026
Date filed
11/10/2026
Form type
13F-HR
Num holdings
221
Total value ($000)
$1,768,691
Net value change ($000)
+37,719 (2.2%)
New positions
8
Sold out positions
9
Turnover %
1.1%
Sector allocation + QoQ delta (equities-only)
Prev filing: 8/6/2026 Next filing: — SEC filing

Snapshot: Change Analysis

Compared to Q2 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)
MSFT 29,359 39.7%
XOM 13,508 18.8%
PSTG 9,900 66.0%
AAPL 7,964 12.5%
TMO 7,189 34.6%
MRK 7,114 13.0%
ADP 6,851 15.1%
QQQ 4,670 NEW
PYPL 4,172 22.2%
ROL 3,802 58.3%
Top Reduces (Value $000, Stocks/ETFs)
CAT -27,388 -27.3%
CCJ -4,765 -14.9%
SIRI -4,248 -25.3%
LBRDA -4,042 -100.0%
UNH -3,263 -17.8%
ALKERMES PLC -2,907 -22.7%
TECH -2,758 -51.0%
GEV -2,632 -19.1%
FUL -2,425 -17.2%
GE -2,192 -16.4%
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