Institutional Manager · CIK 0001082461
S&CO INC
BOSTON, MA · File #028-04997
Latest AUM
$1.6M
Positions
218
Top-10 Concentration
47.7%
Filings
9
Portfolio Value Over Time
2024-03
2024-06
2024-09
2024-12
2025-03
2025-06
2025-09
2025-12
Biggest QoQ Changes
Ranked by conviction flow (share change × current price) so mark-to-market moves don't dominate. Price effect column shows how much of the $ change was just the stock moving.
| Action | Issuer | Ticker / CUSIP | Δ Shares | Flow ($) | Price Effect |
|---|---|---|---|---|---|
| EXITED | LIBERTY MEDIA CORP-LIBERTY LIV | 531229722 | -177,006 | -$17,164 | $0 |
| REDUCE | CAMECO CORP | CCJ | -161,145 | -$14,743 | +$3,948 |
| NEW | LIBERTY MEDIA CORP-LIBERTY LIV | LLYVK | +176,571 | +$14,683 | $0 |
| EXITED | FMC CORP | 302491303 | -370,806 | -$12,470 | $0 |
| EXITED | OCCIDENTAL PETROLEUM CORP | 674599105 | -105,115 | -$4,966 | $0 |
| NEW | DIAMONDBACK ENERGY INC | FANG | +31,300 | +$4,705 | $0 |
| EXITED | LIBERTY MEDIA CORP-LIBERTY LIV | 531229748 | -48,473 | -$4,571 | $0 |
| NEW | LIBERTY MEDIA CORP-LIBERTY LIV | LLYVK | +47,547 | +$3,875 | $0 |
| REDUCE | CATERPILLAR INC COM | CAT | -6,682 | -$3,828 | +$10,728 |
| ADD | VISA INC. CL A | V | +8,163 | +$2,863 | +$217 |
Sector Allocation
Filing History
- 13F HOLDINGS REPORTQ/E Dec 2025218 pos · $1.6M
- 13F HOLDINGS REPORTQ/E Sep 2025222 pos · $1.6M
- 13F HOLDINGS REPORTQ/E Jun 2025223 pos · $1.6M
- 13F HOLDINGS REPORTQ/E Mar 2025217 pos · $1.5M
- 13F HOLDINGS REPORTQ/E Dec 2024210 pos · $1.5M
- 13F HOLDINGS REPORTQ/E Sep 2024219 pos · $1.5M
- 13F HOLDINGS REPORTQ/E Jun 2024217 pos · $1.4M
- 13F HOLDINGS REPORTQ/E Mar 2024210 pos · $1.4M
- 13F HOLDINGS REPORTQ/E Dec 2023184 pos · $1.2M
Top 20 Holdings — Dec 2025
| # | Issuer | Ticker | Shares | Value | % of Portfolio |
|---|---|---|---|---|---|
| 1 | MICROSOFT CORP | MSFT | 172,297 | $83,326 | 6.54% |
| 2 | BERKSHIRE HATHAWAY INC CL B | BRK-A | 164,230 | $82,550 | 6.48% |
| 3 | EXXON MOBIL CORP | XOM | 526,898 | $63,406 | 4.98% |
| 4 | APPLE INC | AAPL | 232,949 | $63,329 | 4.97% |
| 5 | CATERPILLAR INC COM | CAT | 105,396 | $60,378 | 4.74% |
| 6 | ECOLAB INC | ECL | 227,070 | $59,610 | 4.68% |
| 7 | CHURCH & DWIGHT CO INC | CHD | 644,488 | $54,040 | 4.24% |
| 8 | AUTOMATIC DATA PROCESSING INC | ADP | 202,743 | $52,151 | 4.10% |
| 9 | MERCK & CO INC | MRK | 425,531 | $44,791 | 3.52% |
| 10 | AMAZON.COM INC | AMZN | 190,573 | $43,988 | 3.45% |
| 11 | ALPHABET INC CLASS C | GOOG | 118,183 | $37,085 | 2.91% |
| 12 | JOHNSON & JOHNSON | JNJ | 158,298 | $32,759 | 2.57% |
| 13 | CAMECO CORP | CCJ | 356,326 | $32,600 | 2.56% |
| 14 | SPDR GOLD TRUST | GLD | 80,565 | $31,928 | 2.51% |
| 15 | PROSUS NV -SPON ADR | 74365P108 | 2,511,156 | $31,173 | 2.45% |
| 16 | ALPHABET INC CAP STK CL A | GOOG | 95,307 | $29,831 | 2.34% |
| 17 | ABBOTT LABS | ABLZF | 226,710 | $28,404 | 2.23% |
| 18 | THERMO FISHER SCIENTIFIC INC C | TMO | 41,979 | $24,324 | 1.91% |
| 19 | MOSAIC COMPANY | MOS | 973,872 | $23,460 | 1.84% |
| 20 | AIR PRODUCTS & CHEMICALS INC C | AIIR | 94,067 | $23,236 | 1.83% |