Corundum Trust Company, INC

In its 13F for Q2 2025 (holdings as of June 30, 2025, filed July 28, 2025), Corundum Trust Company, INC reported 50 stock positions worth $37.9 million. Its top holding was 3M (MMM) at 16.3% of the portfolio, followed by iShares Core S&P Small-Cap E (IJR, 9.3%) and iShares Select Dividend ETF (DVY, 6.7%). Compared with Q1 2025, it opened 5 new positions, sold out of 5, added to 6 and reduced 16. The biggest buy was a new position in Greatland Resources and the biggest sale an exit from Greatland Gold.

Most Recent 13F
Q2 2026
Location
SIOUX FALLS, SD
CIK
0001987720
Portfolio Value
$37.9M (Q2 2025)
SEC Filing
0001987720-25-000006 ↗ filed Jul 28, 2025

Holdings Value

0$10.0M$20.0M$30.0M$40.0M$50.0M Q2 2024: $34.4M Q2 2024 Q3 2024: $36.3M Q3 2024 Q4 2024: $33.3M Q4 2024 Q1 2025: $34.7M Q1 2025 Q2 2025: $37.9M $37.9M Q2 2025 Q3 2025: $46.1M Q3 2025 Q4 2025: $43.9M Q4 2025 Q1 2026: $43.8M Q1 2026 Q2 2026: $37.4M Q2 2026

Holdings 50 stocks · $37.9M

MMM 3M Co. 16.25% 40,427 $6.2M Reduce 0.0%
IJR iShares Core S&P Small-Cap E 9.32% 32,298 $3.5M Reduce -3.0%
DVY iShares Select Dividend ETF 6.67% 19,014 $2.5M No change
MSFT Microsoft Corp. 6.49% 4,942 $2.5M Reduce -5.4%
IJK iShares S&P Mid-Cap 400 Grow 5.22% 21,744 $2.0M No change
IVV iShares Core S&P 500 ETF 4.85% 2,957 $1.8M No change
IJJ iShares S&P Mid-Cap 400 Valu 4.30% 13,166 $1.6M No change
AAPL Apple Inc. 3.54% 6,540 $1.3M Reduce -0.1%
EFA iShares MSCI Eafe ETF 3.00% 12,732 $1.1M Reduce -0.0%
GOOG Alphabet Inc. Class C 2.84% 6,058 $1.1M Reduce -0.0%
SKE Skeena Resources Ltd. 2.74% 65,250 $1.0M No change
SPY SS SPDR S&P 500 ETF Trust-US 2.66% 1,629 $1.0M Reduce -0.1%
LLY Eli Lilly & Co. 2.27% 1,102 $859K Reduce -3.8%
SOLV Solventum Corp. 2.02% 10,111 $767K No change
JPM JPMorgan Chase & Co. 1.92% 2,504 $726K Reduce -0.0%
GREATLAND RESOURCES 1.87% 151,250 $708K New
WDOFF Wesdome Gold Mines Ltd. 1.77% 48,000 $669K No change
LUGDF Lundin Gold Inc. 1.53% 11,000 $580K New
DiscoverySilverCorp 1.48% 257,500 $559K Add +368.2%
CSCO Cisco Systems Inc. 1.43% 7,807 $542K Reduce -0.0%
VTHR Vanguard Russell 3000 1.36% 1,892 $516K No change
UNH Unitedhealth Group Inc. 1.24% 1,508 $470K Reduce -6.9%
NGEX MINERALS LTD 1.08% 35,000 $408K Add +16.7%
AMZN Amazon.com Inc. 1.00% 1,721 $378K Reduce -0.1%
AYA Aya Gold & Silver Inc. 0.95% 40,000 $360K Add +166.7%
UGI Ugi Corp. 0.94% 9,773 $356K Reduce -14.1%
FNV Franco-Nevada Corp. 0.87% 2,000 $328K No change
BRK.B Berkshire Hathaway Inc. Class B 0.85% 666 $324K Reduce -0.1%
UNP Union Pacific Corp. 0.84% 1,382 $318K No change
C Citigroup Inc. 0.74% 3,315 $282K No change
OGNRF Orogen Royalties Inc. 0.74% 200,000 $280K Reduce -61.8%
AEM Agnico Eagle Mines Ltd. 0.63% 2,000 $238K No change
NEM Newmont Corp. 0.62% 4,000 $233K New
EEM iShares MSCI Emerging Market 0.61% 4,810 $232K No change
NESRF Northern Star Resources Ltd. filed as NTHN STAR RES LTD NPV 0.61% 18,500 $231K No change
RUPRF Rupert Resources Ltd. 0.59% 63,500 $224K No change
CAHPF Evolution Mining Ltd. 0.55% 40,000 $207K No change
TMO Thermo Fisher Scientific Inc. 0.54% 500 $203K No change
VZLA Vizsla Silver Corp. 0.47% 60,250 $177K No change
SNWGF Snowline Gold Corp. 0.44% 27,000 $167K Add +8.0%
KGC Kinross Gold Corp. 0.41% 10,000 $156K No change
SXGCF Southern Cross Gold Consolid 0.37% 30,000 $142K Add +50.0%
AG First Majestic Silver Corp. 0.26% 12,000 $99K No change
ONXGF Onyx Gold Corp. 0.24% 61,200 $90K New
AIRRF Aurion Resources Ltd. 0.22% 156,125 $83K No change
DYLLF Deep Yellow Ltd. 0.18% 62,162 $69K Reduce -44.6%
PREDICTIVE DISCOVERY LTD MELBO 0.17% 300,000 $66K No change
GYYSF Spartan Resources Ltd./Austra 0.14% 50,000 $55K Add +25.0%
GLGDF Gogold Resources Inc. 0.12% 30,000 $44K New
WLFFF Wolfden Resources Corp. 0.05% 398,802 $20K No change

Portfolio Sells Q1 2025 → Q2 2025

GREATLAND GOLD Sold out 0.00% −1.34
MAG Mag Silver Corp. Sold out 0.00% −1.24
UNH Unitedhealth Group Inc. Reduce -6.9% 1.24% −1.20
OGNRF Orogen Royalties Inc. Reduce -61.8% 0.74% −0.89
MMM 3M Co. Reduce 0.0% 16.25% −0.86
IJR iShares Core S&P Small-Cap E Reduce -3.0% 9.32% −0.71
AAPL Apple Inc. Reduce -0.1% 3.54% −0.65
LLY Eli Lilly & Co. Reduce -3.8% 2.27% −0.46
BRK.B Berkshire Hathaway Inc. Class B Reduce -0.1% 0.85% −0.17
GUYGF G2 Goldfields Inc. Sold out 0.00% −0.16
UGI Ugi Corp. Reduce -14.1% 0.94% −0.14
DYLLF Deep Yellow Ltd. Reduce -44.6% 0.18% −0.03
BEMETALS CORP COM Sold out 0.00% −0.01
BRKCF Barksdale Resources Corp. Sold out 0.00% −0.01
EFA iShares MSCI Eafe ETF Reduce -0.0% 3.00% +0.01
SPY SS SPDR S&P 500 ETF Trust-US Reduce -0.1% 2.66% +0.03
CSCO Cisco Systems Inc. Reduce -0.0% 1.43% +0.04
AMZN Amazon.com Inc. Reduce -0.1% 1.00% +0.05
GOOG Alphabet Inc. Class C Reduce -0.0% 2.84% +0.11
JPM JPMorgan Chase & Co. Reduce -0.0% 1.92% +0.15
MSFT Microsoft Corp. Reduce -5.4% 6.49% +0.84

Portfolio Buys Q1 2025 → Q2 2025

GREATLAND RESOURCES New 1.87% +1.87
LUGDF Lundin Gold Inc. New 1.53% +1.53
DiscoverySilverCorp Add +368.2% 1.48% +1.24
AYA Aya Gold & Silver Inc. Add +166.7% 0.95% +0.62
NEM Newmont Corp. New 0.62% +0.62
NGEX MINERALS LTD Add +16.7% 1.08% +0.29
ONXGF Onyx Gold Corp. New 0.24% +0.24
SXGCF Southern Cross Gold Consolid Add +50.0% 0.37% +0.20
GLGDF Gogold Resources Inc. New 0.12% +0.12
GYYSF Spartan Resources Ltd./Austra Add +25.0% 0.14% +0.03
SNWGF Snowline Gold Corp. Add +8.0% 0.44% +0.01

All Filings

QuarterPositions13F Reported ValueTop Holdings
Q2 2026 28$37.4MMMM, IJR, DVY, IJK, IVV
Q1 2026 48$43.8MMMM, IJR, DVY, IJK, IVV
Q4 2025 51$43.9MMMM, IJR, DVY, MSFT, IJK
Q3 2025 127$46.1MMMM, IJR, DVY, MSFT, IJK
Q2 2025 50$37.9MMMM, IJR, DVY, MSFT, IJK
Q1 2025 50$34.7MMMM, IJR, DVY, MSFT, IJK
Q4 2024 49$33.3MMMM, IJR, DVY, MSFT, IJK
Q3 2024 52$36.3MMMM, IJR, DVY, MSFT, IJK
Q2 2024 55$34.4MMMM, IJR, MSFT, AAPL, DVY