Corundum Trust Company, INC
Regulatory profile
From Form ADV, the SEC filer profile, 13D/13G type codes and N-CEN, never from the name.
Portfolio style
Measured from the filed 13F common-share book for Jun 30, 2026, the newest measured quarter, never from the firm's own description.
Closest benchmark: the S&P 500 as of 2026-06-30, active share 77.7%; sector active share 45.4% against the combined 13F book's sector weights.
Over time 11 measured quarters
How the bands are measured
Style bands measure the filed 13F common-share book each closed quarter, tested in this order. Unknown: under $10,000,000 of valued equity or 5 stocks. Index-like (100+ stocks): active share of 20% or less against the closest benchmark, which is the S&P 500, S&P MidCap 400, S&P SmallCap 600, Russell 1000, Russell 2000, Nasdaq-100 or Dow Jones Industrial Average (weighted by an index-tracking fund's reported holdings or the index's constituents nearest the quarter end, over the names resolved to companies, and only when those are 90%+ of its weight) or every 13F filer's combined book, or index series holding 80%+ of the registered fund assets it advises (N-CEN) and equal to 50%+ of its book. Systematic-like: 500+ stocks, 100%+ annual turnover and a top 10 weight of 25% or less. Concentrated: a top 10 weight of 60%+ or 12 or fewer effective positions. Diversified active: none of these. Turnover is the smaller of buys and sells over average equity value, summed over four quarters: low under 30%, high 100%+. Horizon is the value-weighted number of quarters each position has been held: short under 4, long 12+.
Clone Performance
Build a hypothetical price-return history from this filer's public 13F holdings.
View clone backtestPortfolio Concentration
28 tracked positions · as of Sep 30, 2026 · Δ vs Jun 30, 2026Portfolio Trend
Sector Breakdown
As of Sep 30, 2026| Sector | % Portfolio | Value |
|---|---|---|
| Unclassified | 47.2% | $17,806,553 |
| Industrials | 18.1% | $6,823,895 |
| Technology | 14.5% | $5,464,484 |
| Healthcare | 8.7% | $3,286,426 |
| Communication Services | 4.8% | $1,804,559 |
| Financial Services | 4.2% | $1,573,522 |
| Consumer Cyclical | 1.1% | $424,302 |
| Utilities | 0.9% | $348,602 |
| Consumer Defensive | 0.6% | $228,767 |
Last Quarter's Activity
Export CSVAdded To
Positions the filer increasedTrimmed
Positions the filer reduced| Ticker | Company | Δ Shares | Shares | Value | Open |
|---|---|---|---|---|---|
| IJR | iShares Core S&P Small-Cap ETF | −97 | 31,198 | $4,244,175 | |
| AAPL | Apple Inc. | −21 | 6,491 | $2,161,632 | |
| GOOG | Alphabet Inc. | −17 | 5,296 | $1,804,559 | |
| EFA | iShares MSCI EAFE ETF | −17 | 12,639 | $1,313,065 | |
| MSFT | Microsoft Corp | −11 | 4,812 | $2,468,074 | |
| SPY | Spdr S&P 500 ETF Trust | −10 | 1,223 | $932,696 | |
| No positions match the current search. | |||||
New Positions
Positions the filer opened this quarter| Ticker | Company | Shares | Value | Open |
|---|---|---|---|---|
| TGT | Target Corp | 1,460 | $228,767 | |
| No positions match the current search. | ||||
Sold Out
Positions the filer fully exited| Ticker | Company | Shares | Value | Open |
|---|---|---|---|---|
| BA | Boeing Co | 958 | $207,378 | |
| No positions match the current search. | ||||
| Ticker | Company | Type | Shares | Value (USD) | % of Portfolio | History |
|---|---|---|---|---|---|---|
| MMM |
3M Co
Industrials
|
Held | 39,280 | $6,447,812 | 17.08% | |
| IJR |
iShares Core S&P Small-Cap ETF
|
Reduced | 31,198 | $4,244,175 | 11.24% | |
| DVY |
iShares Select Dividend ETF
|
Held | 18,840 | $2,864,998 | 7.59% | |
| IVV |
iShares Core S&P 500 ETF
|
Held | 3,306 | $2,531,900 | 6.71% | |
| MSFT |
Microsoft Corp
Technology
|
Reduced | 4,812 | $2,468,074 | 6.54% | |
| IJK |
iShares S&P Mid-Cap 400 Growth ETF
|
Held | 22,354 | $2,450,221 | 6.49% | |
| AAPL |
Apple Inc.
Technology
|
Reduced | 6,491 | $2,161,632 | 5.72% | |
| IJJ |
iShares S&P Mid-Cap 400 Value ETF
|
Held | 13,166 | $1,813,089 | 4.80% | |
| GOOG |
Alphabet Inc.
Communication Services
|
Reduced | 5,296 | $1,804,559 | 4.78% | |
| EFA |
iShares MSCI EAFE ETF
|
Reduced | 12,639 | $1,313,065 | 3.48% | |
| LLY |
ELI LILLY & Co
Healthcare
|
Held | 1,095 | $1,267,002 | 3.36% | |
| SPY |
Spdr S&P 500 ETF Trust
|
Reduced | 1,223 | $932,696 | 2.47% | |
| SOLV |
Solventum Corp
Healthcare
|
Held | 9,831 | $866,602 | 2.29% | |
| CSCO |
Cisco Systems, Inc.
Technology
|
Held | 7,756 | $834,778 | 2.21% | |
| JPM |
Jpmorgan Chase & Co
Financial Services
|
Held | 2,476 | $819,135 | 2.17% | |
| VTHR |
VANGUARD RUSSELL 3000 INDEX FUND
|
Held | 1,892 | $634,766 | 1.68% | |
| UNH |
Unitedhealth Group Inc
Healthcare
|
Held | 1,499 | $550,252 | 1.46% | |
| IVW |
iShares S&P 500 Growth ETF
|
Held | 3,110 | $442,428 | 1.17% | |
| C |
Citigroup Inc
Financial Services
|
Held | 3,315 | $429,226 | 1.14% | |
| AMZN |
Amazon Com Inc
Consumer Cyclical
|
Held | 1,703 | $424,302 | 1.12% | |
| UNP |
Union Pacific Corp
Industrials
|
Held | 1,382 | $376,083 | 1.00% | |
| UGI |
Ugi Corp
Utilities
|
Held | 9,773 | $348,602 | 0.92% | |
| TMO |
Thermo Fisher Scientific Inc.
Healthcare
|
Held | 500 | $337,525 | 0.89% | |
| BRK-B |
Berkshire Hathaway Inc
Financial Services
|
Held | 653 | $325,161 | 0.86% | |
| EEM |
iShares MSCI Emerging Markets ETF
|
Held | 4,810 | $321,259 | 0.85% | |
| MRK |
Merck & Co., Inc.
Healthcare
|
Held | 1,824 | $265,045 | 0.70% | |
| IVE |
iShares S&P 500 Value ETF
|
Held | 1,130 | $257,956 | 0.68% | |
| TGT |
Target Corp
Consumer Defensive
|
NEW | 1,460 | $228,767 | 0.61% |
Covers the securities this platform tracks: U.S.-listed common stock and the put/call positions reported on it. A 13F can also report security types outside that coverage — preferred shares, bonds, warrants, untracked share classes — so the filing's own declared total can exceed the figures above. The source filing is linked at the top of this table.