Institutional Manager · CIK 0001987720
Corundum Trust Company, INC
SIOUX FALLS, SD · File #028-23323
Latest AUM
$43.9M
Positions
51
Top-10 Concentration
58.8%
Filings
8
Portfolio Value Over Time
2023-12
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 |
|---|---|---|---|---|---|
| NEW | NGEX MINERALS LTD NEW COM | NGXXF | +35,000 | +$653,100 | $0 |
| EXITED | NGEX MINERALS LTD COM | 65343p103 | -35,000 | -$652,750 | $0 |
| REDUCE | SPDR S&P 500 ETF TRUST | SPY | -954 | -$650,552 | +$25,436 |
| EXITED | UGI CORPORATION | 902681105 | -9,773 | -$325,050 | $0 |
| REDUCE | ISHARES CORE S&P SMALL CAP ETF | 464287804 | -2,016 | -$242,283 | +$43,333 |
| REDUCE | 3M COMPANY | MMM | -1,269 | -$203,167 | +$198,886 |
| EXITED | BOEING CO | 097023105 | -886 | -$191,225 | $0 |
| EXITED | VANGUARD FTSE EMERGING MARKETS | 922042858 | -3,325 | -$180,148 | $0 |
| EXITED | TRIPLE FLAG PRECIOUS METALS CO | 89679m104 | -5,802 | -$169,767 | $0 |
| EXITED | MERCK & CO INC | 58933y105 | -1,963 | -$164,755 | $0 |
Sector Allocation
Filing History
- 13F HOLDINGS REPORTQ/E Dec 202551 pos · $43.9M
- 13F HOLDINGS REPORTQ/E Sep 2025127 pos · $46.1M
- 13F HOLDINGS REPORTQ/E Jun 202550 pos · $37.9M
- 13F HOLDINGS REPORTQ/E Mar 202550 pos · $34.7M
- 13F HOLDINGS REPORTQ/E Dec 202449 pos · $33.3M
- 13F HOLDINGS REPORTQ/E Sep 202452 pos · $36.3M
- 13F HOLDINGS REPORTQ/E Jun 202455 pos · $34.4M
- 13F HOLDINGS REPORTQ/E Dec 202337 pos · $33.5M
Top 20 Holdings — Dec 2025
| # | Issuer | Ticker | Shares | Value | % of Portfolio |
|---|---|---|---|---|---|
| 1 | 3M COMPANY | MMM | 39,155 | $6.3M | 14.28% |
| 2 | ISHARES CORE S&P SMALL CAP ETF | 464287804 | 30,082 | $3.6M | 8.23% |
| 3 | ISHARES SELECT DIVIDEND ETF | 464287168 | 18,872 | $2.7M | 6.07% |
| 4 | MICROSOFT CORP | MSFT | 4,794 | $2.3M | 5.28% |
| 5 | ISHARES S&P MID CAP 400 GROWTH | 464287606 | 21,744 | $2.1M | 4.80% |
| 6 | ISHARES CORE S&P 500 ETF | 464287200 | 2,943 | $2.0M | 4.59% |
| 7 | ALPHABET INC CLASS C CAPITAL S | GOOG | 5,881 | $1.8M | 4.20% |
| 8 | ISHARES S&P MID CAP 400 VALUE | 464287705 | 13,166 | $1.7M | 3.95% |
| 9 | APPLE INC | AAPL | 6,189 | $1.7M | 3.83% |
| 10 | DISCOVERY SILVER CORP COMMON | 254677107 | 257,500 | $1.6M | 3.58% |
| 11 | SKEENA RESOURCES LIMITED NEW C | SKE | 63,750 | $1.5M | 3.45% |
| 12 | ISHARES MSCI EAFE ETF | 464287465 | 12,319 | $1.2M | 2.69% |
| 13 | ELI LILLY & CO | LLY | 1,076 | $1.2M | 2.63% |
| 14 | GREATLAND RES LTD ORDINARY FUL | q4319f106 | 151,250 | $1.0M | 2.39% |
| 15 | LUNDIN GOLD INC COM | 550371108 | 11,000 | $913,440 | 2.08% |
| 16 | WESDOME GOLD MINES LTD | 95083r100 | 48,000 | $795,360 | 1.81% |
| 17 | JPMORGAN CHASE & CO | VYLD | 2,442 | $786,861 | 1.79% |
| 18 | SOLVENTUM CORPORATION COMMON S | SOLV | 9,831 | $779,008 | 1.77% |
| 19 | NGEX MINERALS LTD NEW COM | NGXXF | 35,000 | $653,100 | 1.49% |
| 20 | CISCO SYSTEMS INC | CSCO | 7,652 | $589,434 | 1.34% |