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Corundum Trust Company, INC — 13F Holdings & Portfolio

CIK 1987720 · latest 13F-HR filed 2026-07-29

Backtest portfolio

Corundum Trust Company, INC manages $37.4M in 13F-reported U.S. long-equity assets across 28 reported positions as of its 2026-06-30 13F-HR filing. Its largest disclosed positions are MMM (16.98%), IJR (12.39%), DVY (7.86%). Quarter over quarter (versus its 2026-03-31 filing) the fund opened 1 new position, exited 21, added to 22, and trimmed 1.

AUM is the long-equity portion reported on Form 13F-HR. Excludes short positions, cash, foreign holdings, and non-13F assets. For informational purposes only — not investment advice.

Filer Information
Address
401 E. 8TH STREET
SUITE 303
SIOUX FALLS, SD 57103
Phone
+1 (605) 800-1992
Filing Manager
Corundum Trust Company, INC
SIOUX FALLS, SD
Signatory
Kolton Michalski
Trust Officer
Loading holdings…
AUM

$37.4M

Long-equity book

Holdings

28

Distinct positions

Period

2026-06-30

Filed 2026-07-29

Q/Q Activity

+1 / −21 / ↑22 / ↓1

vs 2026-03-31

Firm Profile & Key People
Name Title / Status Ownership Type

Top Adds (vs prior quarter)

  • ISHARES CORE S&P SMALL CAP ETF$725.3K +18.5%
  • 3M COMPANY$655.2K +11.5%
  • ISHARES S&P MID CAP 400 GROWTH$377.3K +16.8%
  • ALPHABET INC CLASS C CAPITAL S$349.7K +22.9%
  • ISHARES CORE S&P 500 ETF$316.3K +14.6%
Show all 22 →

Top Trims

  • UGI CORPORATION-$18.4K -5.2%
Show all 1 →

New Positions

  • BOEING CO$207.4K
Show all 1 →

Exited Positions

  • SKEENA RESOURCES LIMITED NEW C$1.6M
  • DISCOVERY SILVER CORP COMMON$1.6M
  • GREATLAND RES LTD ORDINARY FUL$1.1M
  • LUNDIN GOLD INC COM$838.2K
  • WESDOME GOLD MINES LTD$677.2K
Show all 21 →
All Holdings

Rows tagged Call or Put are options positions, not stock. Per SEC Form 13F-HR, Value shows the notional value of the underlying (shares covered × underlying price), not the option premium. Shares is the number of underlying shares covered (divide by 100 for contract count).

# Issuer Symbol CUSIP Value Weight Shares Type
1 3M COMPANY MMM 88579Y101 $6.4M 16.98% 39,280 SH
2 ISHARES CORE S&P SMALL CAP ETF IJR 464287804 $4.6M 12.39% 31,295 SH
3 ISHARES SELECT DIVIDEND ETF DVY 464287168 $2.9M 7.86% 18,840 SH
4 ISHARES S&P MID CAP 400 GROWTH IJK 464287606 $2.6M 7.01% 22,354 SH
5 ISHARES CORE S&P 500 ETF IVV 464287200 $2.5M 6.61% 3,306 SH
6 ISHARES S&P MID CAP 400 VALUE IJJ 464287705 $1.9M 5.19% 13,166 SH
7 APPLE INC AAPL 037833100 $1.9M 5.03% 6,512 SH
8 ALPHABET INC CLASS C CAPITAL S GOOG 02079K107 $1.9M 5.01% 5,313 SH
9 MICROSOFT CORP MSFT 594918104 $1.8M 4.80% 4,823 SH
10 ISHARES MSCI EAFE ETF EFA 464287465 $1.3M 3.51% 12,656 SH
11 ELI LILLY & CO LLY 532457108 $1.3M 3.51% 1,095 SH
12 STATE STREET SPDR S&P 500 ETF SPY 78462F103 $920.8K 2.46% 1,233 SH
13 CISCO SYSTEMS INC CSCO 17275R102 $911.0K 2.43% 7,756 SH
14 JPMORGAN CHASE & CO JPM 46625H100 $810.5K 2.16% 2,476 SH
15 SOLVENTUM CORPORATION COMMON S SOLV 83444M101 $758.5K 2.03% 9,831 SH
16 VANGUARD RUSSELL 3000 ETF VTHR 92206C599 $627.1K 1.67% 1,892 SH
17 UNITEDHEALTH GROUP INC UNH 91324P102 $623.0K 1.66% 1,499 SH
18 CITIGROUP INC COM C 172967424 $464.0K 1.24% 3,315 SH
19 ISHARES S&P 500 GROWTH ETF IVW 464287309 $427.7K 1.14% 3,110 SH
20 AMAZON.COM INC AMZN 023135106 $405.9K 1.08% 1,703 SH
21 UNION PACIFIC CORP UNP 907818108 $375.9K 1.00% 1,382 SH
22 UGI CORPORATION UGI 902681105 $337.6K 0.90% 9,773 SH
23 ISHARES MSCI EMERGING MARKETS EEM 464287234 $329.1K 0.88% 4,810 SH
24 BERKSHIRE HATHAWAY CLASS B BRK.B 084670702 $326.8K 0.87% 653 SH
25 ISHARES S&P 500 VALUE ETF IVE 464287408 $256.6K 0.69% 1,130 SH
26 THERMO FISHER SCIENTIFIC INC TMO 883556102 $250.7K 0.67% 500 SH
27 MERCK & CO INC MRK 58933Y105 $234.4K 0.63% 1,824 SH
28 BOEING CO BA 097023105 $207.4K 0.55% 958 SH
Filing History
Period Filed AUM Holdings Accession
2026-06-30 2026-07-29 $37.4M 28 0001987720-26-000003
2026-03-31 2026-04-15 $43.8M 48 0001987720-26-000002
2025-12-31 2026-01-20 $43.9M 51 0001987720-26-000001