Institutional Manager · CIK 0000052234
WINMILL & CO. INC
ROCHESTER, NY · File #028-05465
Latest AUM
$374.9M
Positions
83
Top-10 Concentration
52.0%
Filings
10
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 |
|---|---|---|---|---|---|
| ADD | Steel Dynamics, Inc. | STLD | +152,100 | +$25.8M | +$237,158 |
| ADD | Interactive Brokers Group, Inc. | 45841N107 | +280,800 | +$18.1M | -$104,400 |
| ADD | Mueller Industries, Inc. | 624756102 | +153,520 | +$17.6M | +$107,877 |
| ADD | AutoZone, Inc. | AZO | +5,070 | +$17.2M | -$880,765 |
| ADD | LPL Financial Holdings, Inc. | 50212V100 | +44,140 | +$15.8M | +$57,773 |
| ADD | NMI Holdings, Inc. | NMIH | +362,357 | +$14.8M | +$41,330 |
| ADD | Lam Research Corporation | LRCX | +85,000 | +$14.6M | +$447,360 |
| ADD | Williams-Sonoma, Inc. | WSM | +81,000 | +$14.5M | -$252,900 |
| ADD | IAMGOLD Corporation | IAG | +834,000 | +$13.8M | +$733,360 |
| ADD | Progressive Corporation (The) | 743315103 | +55,470 | +$12.6M | -$87,112 |
Sector Allocation
Filing History
- 13F HOLDINGS REPORTQ/E Dec 202583 pos · $374.9M
- 13F HOLDINGS REPORTQ/E Sep 202589 pos · $412.4M
- 13F HOLDINGS REPORTQ/E Jun 202590 pos · $359.6M
- 13F HOLDINGS REPORTQ/E Mar 202595 pos · $329.0M
- 13F HOLDINGS REPORTQ/E Dec 202490 pos · $309.0M
- 13F HOLDINGS REPORT (Amended)Q/E Sep 202488 pos · $297.2M
- 13F HOLDINGS REPORTQ/E Sep 202487 pos · $297.0M
- 13F HOLDINGS REPORTQ/E Jun 202495 pos · $293.2M
- 13F HOLDINGS REPORTQ/E Mar 2024108 pos · $351.3M
- 13F HOLDINGS REPORTQ/E Dec 2023104 pos · $273.0M
Top 20 Holdings — Dec 2025
| # | Issuer | Ticker | Shares | Value | % of Portfolio |
|---|---|---|---|---|---|
| 1 | Steel Dynamics, Inc. | STLD | 160,000 | $27.1M | 7.45% |
| 2 | Alphabet, Inc. | GOOG | 65,700 | $20.6M | 5.65% |
| 3 | AutoZone, Inc. | AZO | 6,050 | $20.5M | 5.64% |
| 4 | Interactive Brokers Group, Inc. | 45841N107 | 304,000 | $19.6M | 5.37% |
| 5 | Mueller Industries, Inc. | 624756102 | 161,400 | $18.5M | 5.09% |
| 6 | IAMGOLD Corporation | IAG | 1,040,000 | $17.1M | 4.71% |
| 7 | Williams-Sonoma, Inc. | WSM | 96,000 | $17.1M | 4.71% |
| 8 | LPL Financial Holdings, Inc. | 50212V100 | 46,500 | $16.6M | 4.56% |
| 9 | Lam Research Corporation | LRCX | 97,000 | $16.6M | 4.56% |
| 10 | NMI Holdings, Inc. | NMIH | 379,226 | $15.5M | 4.25% |
| 11 | Progressive Corporation (The) | 743315103 | 60,000 | $13.7M | 3.75% |
| 12 | Alphabet, Inc. | GOOG | 42,400 | $13.3M | 3.65% |
| 13 | Essent Group Ltd. | ESNT | 200,000 | $13.0M | 3.57% |
| 14 | Dillard's, Inc. | 254067101 | 20,300 | $12.3M | 3.38% |
| 15 | United Rentals, Inc. | URI | 14,500 | $11.7M | 3.22% |
| 16 | HCA Healthcare, Inc. | HCA | 25,100 | $11.7M | 3.22% |
| 17 | Clear Secure, Inc. | YOU | 275,054 | $9.6M | 2.65% |
| 18 | Donnelley Financial Solutions, Inc. | 25787G100 | 191,023 | $8.9M | 2.45% |
| 19 | NVR, Inc. | NVR | 1,045 | $7.6M | 2.09% |
| 20 | PayPal Holdings, Inc. | PYPL | 130,000 | $7.6M | 2.09% |