Corundum Trust Company, INC

Bank

CIK

1987720

Location

SIOUX FALLS, SD

Portfolio Value

Micro $19,489,649

Diversification

Diversified

Filing Date

Global Rank

#7,382 / 8,232 ▲ 199

Top Industry

Conglomerates 30.5%

3Y Alpha vs SPY

+2.8%

Period ended 2 months ago

Filed Apr 15, 2026 · 2mo

10 quarters · since Jun 2023

Clone Performance

Aug 2023–Jun 2026 · vs SPY

Hypothetical growth of cloning every reported 13F position and rebalancing on each filing, indexed to the same start.

Cloned portfolio

+83.0%

SPY

+71.4%

Annualised alpha

+2.8%

Max drawdown

−16.5%

Estimate. 13F holdings are quarter-lagged and long-only, so the clone rebalances about 45 days after each period end — when the filing becomes public — and excludes options and short positions. Past performance does not predict future results.

Portfolio Concentration

25 positions · as of Mar 31, 2026 · Δ vs Dec 31, 2025

Top Position

29.3%

−1.3 pts

Top 5

60.5%

−2.6 pts

Top 10

77.3%

−1.0 pts

HHI

1,207

Diversified−93

Portfolio Trend

10 quarters · across all stocks

Sector Breakdown

As of Mar 31, 2026

Sector	% Portfolio	Value	Positions
Industrials	31.0%	$6,039,934	2
Technology	20.7%	$4,039,797	3
Basic Materials	20.3%	$3,960,975	9
Healthcare	12.9%	$2,519,899	5
Financial Services	7.3%	$1,417,211	3
Unclassified	4.1%	$801,218	1
Utilities	1.8%	$355,932	1
Consumer Cyclical	1.8%	$354,683	1

Last Quarter's Activity

Export CSV

Mar 31, 2026 vs Dec 31, 2025

Added To

Positions the filer increased

9 positions

Ticker	Company	Δ Shares	Shares	Value
SPY	Spdr S&P 500 ETF Trust	+570	1,232	$801,218
AAPL	Apple Inc.	+323	6,512	$1,652,680
MMM	3M Co	+125	39,280	$5,704,634
CSCO	Cisco Systems, Inc.	+104	7,756	$601,788
JPM	Jpmorgan Chase & Co	+34	2,476	$728,340
AMZN	Amazon Com Inc	+31	1,703	$354,683
MSFT	Microsoft Corp	+29	4,823	$1,785,329
LLY	ELI LILLY & Co	+19	1,095	$1,007,148
BRK-B	Berkshire Hathaway Inc	+15	653	$312,917
No positions match the current search.

Trimmed

Positions the filer reduced

1 positions

Ticker	Company	Δ Shares	Shares	Value	Open
SKE	Skeena Resources Ltd	−8,500	55,250	$1,642,030
No positions match the current search.

New Positions

Positions the filer opened this quarter

2 positions

Ticker	Company	Shares	Value
UGI	Ugi Corp /Pa/	9,773	$355,932
MRK	Merck & Co., Inc.	1,824	$219,408
No positions match the current search.

Sold Out

Positions the filer fully exited

2 positions

Ticker	Company	Shares	Value
RUPRF	Rupert Resources Ltd	63,500	$298,450
OR	OR Royalties Inc.	6,000	$212,340
No positions match the current search.

Portfolio Positions

Compact Export CSV View 13F filing

25 positions · $19,489,649 total · as of Mar 31, 2026

All sectors Basic Materials Consumer Cyclical Financial Services Healthcare Industrials Technology Utilities

Ticker	Company	Type	Shares	Δ Shares	Value (USD)	% Δ Value	% of Portfolio
MMM	3M Co Industrials	Added	39,280	+125	$5,704,634	−9.0%	29.27%
MSFT	Microsoft Corp Technology	Added	4,823	+29	$1,785,329	−23.0%	9.16%
AAPL	Apple Inc. Technology	Added	6,512	+323	$1,652,680	−1.8%	8.48%
SKE	Skeena Resources Ltd Basic Materials	Reduced	55,250	-8,500	$1,642,030	+8.5%	8.43%
LLY	ELI LILLY & Co Healthcare	Added	1,095	+19	$1,007,148	−12.9%	5.17%
SPY	Spdr S&P 500 ETF Trust	Added	1,232	+570	$801,218	+77.5%	4.11%
JPM	Jpmorgan Chase & Co Financial Services	Added	2,476	+34	$728,340	−7.4%	3.74%
SOLV	Solventum Corp Healthcare	Held	9,831	0	$641,964	−17.6%	3.29%
CSCO	Cisco Systems, Inc. Technology	Added	7,756	+104	$601,788	+2.1%	3.09%
FNV	FRANCO NEVADA Corp Basic Materials	Held	2,000	0	$494,100	+19.2%	2.54%
NEM	NEWMONT Corp /DE/ Basic Materials	Held	4,000	0	$433,000	+8.4%	2.22%
AEM	Agnico Eagle Mines Ltd Basic Materials	Held	2,000	0	$405,960	+19.7%	2.08%
UNH	Unitedhealth Group Inc Healthcare	Held	1,499	0	$405,614	−18.0%	2.08%
C	Citigroup Inc Financial Services	Held	3,315	0	$375,954	−2.8%	1.93%
UGI	Ugi Corp /Pa/ Utilities	NEW	9,773	NEW	$355,932	NEW	1.83%
AMZN	Amazon Com Inc Consumer Cyclical	Added	1,703	+31	$354,683	−8.1%	1.82%
UNP	Union Pacific Corp Industrials	Held	1,382	0	$335,300	+4.9%	1.72%
BRK-B	Berkshire Hathaway Inc Financial Services	Added	653	+15	$312,917	−2.4%	1.61%
KGC	Kinross Gold Corp Basic Materials	Held	10,000	0	$305,200	+8.4%	1.57%
AG	First Majestic Silver Corp Basic Materials	Held	12,000	0	$257,760	+28.9%	1.32%
TMO	Thermo Fisher Scientific Inc. Healthcare	Held	500	0	$245,765	−15.2%	1.26%
VZLA	Vizsla Silver Corp. Basic Materials	Held	70,250	0	$231,825	−39.7%	1.19%
MRK	Merck & Co., Inc. Healthcare	NEW	1,824	NEW	$219,408	NEW	1.13%
SXGCF	Southern Cross Gold Consolidated Ltd. Basic Materials	Held	30,000	0	$191,100	−17.2%	0.98%
AYA	Aya Gold & Silver Inc. Basic Materials	Held	40,000	0	$0	—	0.00%