Q3 2026 13F · SEC CIK 1987720

Corundum Trust Company, INC

Bank & trustFiled 2026-10-29 for Q3 2026. Open the filing ↗ · All SEC filings ↗

Reported 13F value: $37.8M
Reported positions: 28
Top holdings a year, 3 yrs: +21.4%
Average holding period: 3.0 yrs

Corundum Trust Company, INC is a bank & trust that reported 28 positions worth $37.8M in its Q3 2026 13F, filed 2026-10-29. Its largest holdings were 3m Co (MMM, 17.1%), Ishares Tr (IJR, 11.2%), Ishares Tr (DVY, 7.6%). A portfolio copying its top holdings returned 21.4% a year over the last 3 years, against 20.4% for the S&P 500.

Corundum Trust Company, INC holdings all 28 positions.

Weights are shares of the filer's total reported 13F value, compared with Q2 2026. Share changes may reflect splits; weight changes also reflect price moves. A 13F shows long US-listed positions only, up to 135 days after the fact.

Corundum Trust Company, INC 13F holdings
Stock	% of 13F value	Q2 2026	Shares	Share change	Reported value
MMM3m Co	17.1%	17.0%	39,280	+0.0%	$6.4M
IJRIshares Tr	11.2%	12.4%	31,198	-0.3%	$4.2M
DVYIshares Tr	7.6%	7.9%	18,840	+0.0%	$2.9M
IVVIshares Tr	6.7%	6.6%	3,306	+0.0%	$2.5M
MSFTMicrosoft Corp	6.5%	4.8%	4,812	-0.2%	$2.5M
IJKIshares S&p Mid Cap 400 Growth	6.5%	7.0%	22,354	+0.0%	$2.5M
AAPLApple Inc	5.7%	5.0%	6,491	-0.3%	$2.2M
IJJIshares Tr	4.8%	5.2%	13,166	+0.0%	$1.8M
GOOGAlphabet Inc	4.8%	5.0%	5,296	-0.3%	$1.8M
EFAIshares Tr	3.5%	3.5%	12,639	-0.1%	$1.3M
LLYEli Lilly & Co	3.4%	3.5%	1,095	+0.0%	$1.3M
SPYState Str Spdr S&p 500 ETF T	2.5%	2.5%	1,223	-0.8%	$933K
SOLVSolventum Corporation Common S	2.3%	2.0%	9,831	+0.0%	$867K
CSCOCisco Sys Inc	2.2%	2.4%	7,756	+0.0%	$835K
JPMJpmorgan Chase & Co	2.2%	2.2%	2,476	+0.0%	$819K
VTHRVanguard Russell 3000 ETF	1.7%	1.7%	1,892	+0.0%	$635K
UNHUnitedhealth Group Inc	1.5%	1.7%	1,499	+0.0%	$550K
IVWIshares Tr	1.2%	1.1%	3,110	+0.0%	$442K
CCitigroup Inc	1.1%	1.2%	3,315	+0.0%	$429K
AMZNAmazon Com Inc	1.1%	1.1%	1,703	+0.0%	$424K
UNPUnion Pac Corp	1.0%	1.0%	1,382	+0.0%	$376K
UGIUgi Corporation	0.9%	0.9%	9,773	+0.0%	$349K
TMOThermo Fisher Scientific Inc	0.9%	0.7%	500	+0.0%	$338K
BRK-BBerkshire Hathaway Inc Del	0.9%	0.9%	653	+0.0%	$325K
EEMIshares Tr	0.9%	0.9%	4,810	+0.0%	$321K
MRKMerck & Co Inc	0.7%	0.6%	1,824	+0.0%	$265K
IVEIshares Tr	0.7%	0.7%	1,130	+0.0%	$258K
TGTTarget Corp	0.6%	New	1,460	—	$229K

What Corundum Trust Company, INC bought and sold in Q3 2026, against Q2 2026.

New positions

TGT Target Corp0.6% of 13F

Added to

No position grew by more than 5%.

Reduced

No position shrank by more than 5%.

Sold out

BA Boeing Cowas 0.6%

Share counts compared with the Q2 2026 13F; a split also changes share counts.

How the holdings did against the S&P 500.

1 year: +29.5% /yr; S&P 500 +20.1%
3 years: +21.4% /yr; S&P 500 +20.4%
5 years: —

A portfolio of the filer's 20 largest 13F positions, weighted by value, bought the trading day after each 13F was filed and held until the next one was: what copying this filer could have earned. 13Fs show long US-listed positions only, so this is an estimate of the stock picks, not the fund's reported returns.

Reported 13F value by quarter.

13F value by quarter
Quarter	13F value	Positions
Q3 2026	$37.8M	28
Q2 2026	$37.4M	28
Q1 2026	$43.8M	48
Q4 2025	$43.9M	51
Q3 2025	$46.1M	127
Q2 2025	$37.9M	50
Q1 2025	$34.7M	50
Q4 2024	$33.3M	49
Q3 2024	$36.3M	52
Q2 2024	$34.4M	54
Q3 2023	$33.5M	37
Q2 2023	$36.6M	39

Questions about Corundum Trust Company, INC's portfolio

What stocks does Corundum Trust Company, INC own?

Corundum Trust Company, INC's latest 13F, for Q3 2026 and filed Oct 29, 2026, lists 28 positions worth $37.8M. The largest are 3m Co (MMM) at 17.1%, Ishares Tr (IJR) at 11.2%, Ishares Tr (DVY) at 7.6%, Ishares Tr (IVV) at 6.7% and Microsoft Corp (MSFT) at 6.5%.

What did Corundum Trust Company, INC buy last quarter?

In Q3 2026, Corundum Trust Company, INC added a new position in Target Corp (TGT), compared with its Q2 2026 filing.

What did Corundum Trust Company, INC sell last quarter?

In Q3 2026, Corundum Trust Company, INC sold all of Boeing Co (BA), compared with its Q2 2026 filing.

How has Corundum Trust Company, INC's portfolio performed?

A portfolio copying Corundum Trust Company, INC's 20 largest 13F holdings each quarter, from the day each filing was public, returned +21.4% a year over the last 3 years, against +20.4% for the S&P 500. Over 1 year: +29.5% against +20.1%.

When is Corundum Trust Company, INC's next 13F filing due?

13F filings are due 45 days after each quarter ends. Corundum Trust Company, INC's filing for the quarter ending Dec 31, 2026 is due by Feb 14, 2027; this page updates the day after it is published.