S&CO INC — 13F Holdings & Portfolio
CIK 1082461 · latest 13F-HR filed 2026-08-06
S&CO INC manages $1.7M in 13F-reported U.S. long-equity assets across 222 reported positions as of its 2026-06-30 13F-HR filing. Its largest disclosed positions are CAT (5.79%), BRK.B (4.74%), MSFT (4.27%). Quarter over quarter (versus its 2026-03-31 filing) the fund opened 14 new positions, exited 10, added to 114, and trimmed 56.
AUM is the long-equity portion reported on Form 13F-HR. Excludes short positions, cash, foreign holdings, and non-13F assets. For informational purposes only — not investment advice.
BOSTON, MA 02109
$1.7M
Long-equity book
222
Distinct positions
2026-06-30
Filed 2026-08-06
+14 / −10 / ↑114 / ↓56
vs 2026-03-31
| Name | Title / Status | Ownership | Type |
|---|
Top Adds (vs prior quarter)
- CATERPILLAR INC.$30.2K +43.1%
- PALO ALTO NETWORKS INC$17.4K +124.8%
- ALPHABET INC CLASS C$7.9K +23.2%
- ELI LILLY & CO COM$7.0K +35.1%
- ALPHABET INC CAP STK CL A$6.6K +24.0%
Top Trims
- SPDR GOLD TRUST-$5.0K -14.4%
- LIBERTY LATIN AMERICA-CL A-$4.1K -76.7%
- CAMECO CORP-$3.6K -10.2%
- ABBOTT LABS-$3.6K -17.5%
- DIGITALBRIDGE GROUP INC-$3.4K -94.8%
New Positions
- EXXONMOBIL HOLDINGS CORP$71.9K
- CF INDUSTRIES HOLDINGS INC COM$2.6K
- REDDIT, INC. CLASS A$2.0K
- UBER TECHNOLOGIES INC$1.7K
- MERCADOLIBRE, INC.$1.5K
Exited Positions
- EXXON MOBIL CORP$89.2K
- COGNIZANT TECHNOLOGY SOLUTIONS$1.8K
- HONEYWELL INTERNATIONAL INC CO$1.3K
- ULTRAGENYX PHARMACEUTICAL, INC$529
- IQVIA HOLDINGS INC$511
Rows tagged Call or Put are options positions, not stock. Per SEC Form 13F-HR, Value shows the notional value of the underlying (shares covered × underlying price), not the option premium. Shares is the number of underlying shares covered (divide by 100 for contract count).
| # | Issuer | Symbol | CUSIP | Value | Weight | Shares | Type |
|---|---|---|---|---|---|---|---|
| 1 | CATERPILLAR INC. | CAT | 149123101 | $100.2K | 5.79% | 94,076 | SH |
| 2 | BERKSHIRE HATHAWAY INC CL B | BRK.B | 084670702 | $82.1K | 4.74% | 164,075 | SH |
| 3 | MICROSOFT CORP | MSFT | 594918104 | $74.0K | 4.27% | 198,340 | SH |
| 4 | EXXONMOBIL HOLDINGS CORP | XOM | 30233Q108 | $71.9K | 4.15% | 526,003 | SH |
| 5 | APPLE INC | AAPL | 037833100 | $63.9K | 3.69% | 220,707 | SH |
| 6 | CHURCH & DWIGHT CO INC | CHD | 171340102 | $62.9K | 3.64% | 649,655 | SH |
| 7 | ECOLAB INC | ECL | 278865100 | $62.9K | 3.64% | 225,862 | SH |
| 8 | MERCK & CO INC | MRK | 58933Y105 | $54.7K | 3.16% | 425,528 | SH |
| 9 | AMAZON.COM INC | AMZN | 023135106 | $46.9K | 2.71% | 196,975 | SH |
| 10 | AUTOMATIC DATA PROCESSING INC | ADP | 053015103 | $45.2K | 2.61% | 201,978 | SH |
| 11 | ALPHABET INC CLASS C | GOOG | 02079K107 | $41.7K | 2.41% | 118,113 | SH |
| 12 | JOHNSON & JOHNSON | JNJ | 478160104 | $39.9K | 2.30% | 157,098 | SH |
| 13 | ALPHABET INC CAP STK CL A | GOOGL | 02079K305 | $33.9K | 1.96% | 94,857 | SH |
| 14 | CAMECO CORP | CCJ | 13321L108 | $31.9K | 1.85% | 313,626 | SH |
| 15 | PALO ALTO NETWORKS INC | PANW | 697435105 | $31.3K | 1.81% | 91,852 | SH |
| 16 | SPDR GOLD TRUST | GLD | 78463V107 | $29.7K | 1.71% | 80,565 | SH |
| 17 | AIR PRODUCTS & CHEMICALS INC C | APD | 009158106 | $27.7K | 1.60% | 94,594 | SH |
| 18 | ELI LILLY & CO COM | LLY | 532457108 | $26.7K | 1.55% | 22,300 | SH |
| 19 | MOSAIC COMPANY | MOS | 61945C103 | $22.1K | 1.27% | 1,040,723 | SH |
| 20 | PROSUS NV -SPON ADR | PROSF | 74365P108 | $21.7K | 1.25% | 2,499,611 | SH |
| 21 | THERMO FISHER SCIENTIFIC INC C | TMO | 883556102 | $20.7K | 1.20% | 41,387 | SH |
| 22 | ROYALTY PHARMA PLC CL A | RPRX | G7709Q104 | $20.1K | 1.16% | 358,302 | SH |
| 23 | UNION PACIFIC CORP | UNP | 907818108 | $18.9K | 1.09% | 69,353 | SH |
| 24 | PAYPAL HOLDINGS INC | PYPL | 70450Y103 | $18.8K | 1.09% | 436,017 | SH |
| 25 | LIBERTY MEDIA CORP-LIBERTY LIV | LLYVK | 530909308 | $18.5K | 1.07% | 174,783 | SH |
| 26 | UNITEDHEALTH GROUP INC COM | UNH | 91324P102 | $18.3K | 1.06% | 43,984 | SH |
| 27 | ANTERO RESOURCES CORP | AR | 03674X106 | $17.7K | 1.02% | 504,602 | SH |
| 28 | ABBOTT LABS | ABT | 002824100 | $16.9K | 0.98% | 186,521 | SH |
| 29 | SIRIUS XM HOLDINGS INC | SIRI | 829933100 | $16.8K | 0.97% | 569,206 | SH |
| 30 | EVERPURE, INC. CLASS A | P | 74624M102 | $15.0K | 0.87% | 190,420 | SH |
| 31 | SPDR S&P BIOTECH ETF | XBI | 78464A870 | $14.9K | 0.86% | 94,310 | SH |
| 32 | NVIDIA CORP COM | NVDA | 67066G104 | $14.4K | 0.83% | 72,156 | SH |
| 33 | VISA INC. CL A | V | 92826C839 | $14.4K | 0.83% | 41,890 | SH |
| 34 | H.B. FULLER CO. | FUL | 359694106 | $14.1K | 0.81% | 241,781 | SH |
| 35 | GE VERNOVA INC | GEV | 36828A101 | $13.8K | 0.80% | 11,732 | SH |
| 36 | LINDE PLC | LIN | G54950103 | $13.6K | 0.78% | 26,139 | SH |
| 37 | GE AEROSPACE COM (NEW) | GE | 369604301 | $13.3K | 0.77% | 35,671 | SH |
| 38 | ALKERMES PLC | ALKS | G01767105 | $12.8K | 0.74% | 244,760 | SH |
| 39 | CISCO SYSTEMS INC COM | CSCO | 17275R102 | $12.6K | 0.73% | 107,126 | SH |
| 40 | ROCHE HOLDING LTD SPONSORED AD | RHHBY | 771195104 | $11.9K | 0.69% | 230,310 | SH |
| 41 | LIBERTY FORMULA ONE SER C | FWONK | 531229755 | $11.7K | 0.67% | 122,528 | SH |
| 42 | MASTERCARD INC - A | MA | 57636Q104 | $11.5K | 0.66% | 22,358 | SH |
| 43 | GFL ENVIRONMENTAL | GFL | 36168Q104 | $10.8K | 0.62% | 293,524 | SH |
| 44 | PEPSICO INC | PEP | 713448108 | $10.2K | 0.59% | 75,677 | SH |
| 45 | AFLAC INC COM | AFL | 001055102 | $9.8K | 0.57% | 83,570 | SH |
| 46 | ANALOG DEVICES INC COM | ADI | 032654105 | $9.4K | 0.55% | 23,789 | SH |
| 47 | AIRBNB INC A | ABNB | 009066101 | $8.9K | 0.52% | 62,355 | SH |
| 48 | MEDTRONIC PLC | MDT | G5960L103 | $8.5K | 0.49% | 108,128 | SH |
| 49 | VANGUARD FTSE EMERGING MARKET | VWO | 922042858 | $7.9K | 0.46% | 132,538 | SH |
| 50 | JP MORGAN CHASE & CO | JPM | 46625H100 | $7.6K | 0.44% | 23,285 | SH |
| Period | Filed | AUM | Holdings | Accession |
|---|---|---|---|---|
| 2026-06-30 | 2026-08-06 | $1.7M | 222 | 0001082461-26-000003 |
| 2026-03-31 | 2026-05-07 | $1.6M | 218 | 0001082461-26-000002 |
| 2025-12-31 | 2026-02-05 | $1.6M | 218 | 0001082461-26-000001 |