Q3 2026 13F · SEC CIK 1486083

Corundum Group, Inc.

Hedge fundFiled 2026-10-28 for Q3 2026. Open the filing ↗ · All SEC filings ↗

Reported 13F value: $380.1M
Reported positions: 121
Top holdings a year, 3 yrs: +18.3%
Assets under management: $1.7B

Corundum Group, Inc. is a hedge fund that reported 121 positions worth $380.1M in its Q3 2026 13F, filed 2026-10-28. Its largest holdings were Ishares Tr (IWF, 11.3%), Ishares Tr (IWD, 10.9%), 3m Co (MMM, 6.0%). A portfolio copying its top holdings returned 18.3% a year over the last 3 years, against 20.4% for the S&P 500.

Corundum Group, Inc. holdings largest 50 of 121 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 Group, Inc. 13F holdings
Stock	% of 13F value	Q2 2026	Shares	Share change	Reported value
IWFIshares Tr	11.3%	12.6%	344,169	+0.7%	$43.1M
IWDIshares Tr	10.9%	12.0%	167,207	+0.0%	$41.5M
MMM3m Co	6.0%	4.8%	138,476	+39.3%	$22.7M
EFAIshares Tr	4.9%	5.1%	179,588	+8.9%	$18.7M
IWOIshares Tr	3.2%	4.1%	34,562	-0.5%	$12.3M
IWNIshares Tr	2.9%	3.5%	51,848	-2.3%	$10.9M
SPYState Str Spdr S&p 500 ETF T	2.8%	2.8%	13,929	+11.1%	$10.6M
IWPIshares Tr	2.8%	3.3%	76,679	+0.5%	$10.6M
AAPLApple Inc	2.7%	2.1%	31,139	+27.4%	$10.4M
IWSIshares Tr	2.6%	3.0%	62,246	+0.7%	$10.0M
LMTLockheed Martin Corp	2.6%	2.9%	19,057	+0.1%	$9.7M
MSFTMicrosoft Corp	2.3%	1.4%	17,371	+38.9%	$8.9M
SUSAIshares Tr	1.9%	2.2%	47,498	-0.9%	$7.4M
LINLinde PLC	1.7%	2.1%	13,914	+0.0%	$6.6M
VONVVanguard Scottsdale Fds	1.4%	1.5%	49,799	+4.1%	$5.4M
GOOGAlphabet Inc	1.3%	1.0%	14,256	+49.9%	$4.9M
IWBIshares Tr	1.3%	1.3%	11,474	+4.5%	$4.8M
IJRIshares Tr	1.2%	—	34,038	—	$4.6M
IWMIshares Tr	1.1%	1.2%	14,779	+5.5%	$4.1M
NVDANvidia Corporation	1.1%	1.0%	17,941	+2.7%	$4.1M
JPMJpmorgan Chase & Co	1.1%	1.0%	12,361	+25.7%	$4.1M
INTCIntel Corp	1.0%	1.2%	31,041	+4.0%	$3.7M
GLDSpdr Gold Tr	1.0%	1.0%	9,776	+4.0%	$3.7M
SPLGSpdr Series Trust	1.0%	1.0%	40,963	+10.1%	$3.7M
SPLVInvesco Exch Traded Fd Tr II	0.9%	1.1%	49,871	+5.4%	$3.5M
GOOGLAlphabet Inc	0.9%	1.0%	9,809	+0.5%	$3.4M
IVWIshares Tr	0.9%	0.8%	23,110	+13.1%	$3.3M
LLYEli Lilly & Co	0.9%	0.6%	2,801	+66.6%	$3.2M
IJKIshares S&p Mid Cap 400 Growth	0.8%	—	28,619	—	$3.1M
XOMExxonmobil Holdings Corp	0.8%	0.8%	19,213	+2.1%	$3.1M
CSCOCisco Sys Inc	0.8%	0.7%	28,266	+39.7%	$3.0M
VOOVanguard Index Fds	0.8%	0.8%	4,330	+4.3%	$3.0M
DVYIshares Tr	0.8%	—	18,840	—	$2.9M
FTGCFirst Trust Global Tactical Co	0.7%	0.7%	89,329	+6.1%	$2.7M
CATCaterpillar Inc	0.7%	1.1%	3,368	+0.9%	$2.7M
IVVIshares Tr	0.7%	—	3,318	—	$2.5M
AMZNAmazon Com Inc	0.7%	0.6%	9,924	+15.4%	$2.5M
AVGOBroadcom Inc	0.6%	0.8%	6,801	+0.2%	$2.4M
VVisa Inc	0.6%	0.6%	6,223	+4.6%	$2.2M
XLUSelect Sector Spdr Tr	0.6%	0.7%	56,576	+6.0%	$2.2M
ABBVAbbvie Inc	0.6%	0.6%	8,240	+3.0%	$2.2M
JNJJohnson & Johnson	0.6%	0.6%	7,996	+3.1%	$2.1M
NUSCNushares ETF Tr	0.6%	0.7%	43,193	-0.3%	$2.1M
IJHIshares Tr	0.5%	0.6%	26,055	-3.7%	$1.9M
MRKMerck & Co Inc	0.5%	0.4%	12,829	+19.9%	$1.9M
IJJIshares Tr	0.5%	—	13,166	—	$1.8M
GSGoldman Sachs Group Inc	0.5%	0.6%	1,957	+3.2%	$1.8M
USBUS Bancorp	0.4%	0.5%	29,037	+3.7%	$1.7M
BMYBristol-Myers Squibb Co	0.4%	0.4%	26,645	+3.2%	$1.7M
BRK-BBerkshire Hathaway Inc Del	0.4%	—	3,225	—	$1.6M

What Corundum Group, Inc. bought and sold in Q3 2026, against Q2 2026.

New positions

Q2 2026's filing was too long to tell new positions apart.

Added to

LLY Eli Lilly & Co+66.6% shares
GOOG Alphabet Inc+49.9% shares
CSCO Cisco Sys Inc+39.7% shares
MMM 3m Co+39.3% shares
MSFT Microsoft Corp+38.9% shares
AAPL Apple Inc+27.4% shares
JPM Jpmorgan Chase & Co+25.7% shares
MRK Merck & Co Inc+19.9% shares

Reduced

No position shrank by more than 5%.

Left the top 50

ECL Ecolab Incwas 0.5%
HD Home Depot Incwas 0.4%
BAC Bank of Amer Corpwas 0.4%
COST Costco Wholesale Corporationwas 0.4%
DUK Duke Energy Corp Newwas 0.4%
WM Waste Mgmt Inc Delwas 0.4%

Share counts compared with the Q2 2026 13F; a split also changes share counts. The latest filing lists more than 50 positions, so a position that left the top 50 may still be held.

How the holdings did against the S&P 500.

1 year: +18.8% /yr; S&P 500 +20.1%
3 years: +18.3% /yr; S&P 500 +20.4%
5 years: +7.6% /yr; S&P 500 +11.6%

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	$380.1M	121
Q2 2026	$337.1M	111
Q1 2026	$299.2M	107
Q4 2025	$298.0M	112
Q3 2025	$243.4M	102
Q2 2025	$226.2M	102
Q1 2025	$208.5M	97
Q4 2024	$267.8M	99
Q3 2024	$219.2M	99
Q2 2024	$256.0M	100
Q1 2024	$207.3M	97
Q4 2023	$199.4M	99

Questions about Corundum Group, Inc.'s portfolio

What stocks does Corundum Group, Inc. own?

Corundum Group, Inc.'s latest 13F, for Q3 2026 and filed Oct 28, 2026, lists 121 positions worth $380.1M. The largest are Ishares Tr (IWF) at 11.3%, Ishares Tr (IWD) at 10.9%, 3m Co (MMM) at 6.0%, Ishares Tr (EFA) at 4.9% and Ishares Tr (IWO) at 3.2%.

What did Corundum Group, Inc. buy last quarter?

In Q3 2026, Corundum Group, Inc. added Eli Lilly & Co (LLY) (+66.6% shares), Alphabet Inc (GOOG) (+49.9% shares) and Cisco Sys Inc (CSCO) (+39.7% shares), compared with its Q2 2026 filing.

What did Corundum Group, Inc. sell last quarter?

In Q3 2026, Corundum Group, Inc. cut from its top 50 Ecolab Inc (ECL), cut from its top 50 Home Depot Inc (HD), cut from its top 50 Bank of Amer Corp (BAC), cut from its top 50 Costco Wholesale Corporation (COST) and cut from its top 50 Duke Energy Corp New (DUK), compared with its Q2 2026 filing.

How has Corundum Group, Inc.'s portfolio performed?

A portfolio copying Corundum Group, Inc.'s 20 largest 13F holdings each quarter, from the day each filing was public, returned +18.3% a year over the last 3 years, against +20.4% for the S&P 500. Over 1 year: +18.8% against +20.1%. Over 5 years: +7.6% a year against +11.6%.

When is Corundum Group, Inc.'s next 13F filing due?

13F filings are due 45 days after each quarter ends. Corundum Group, 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.

How much money does Corundum Group, Inc. manage?

Corundum Group, Inc. reported $1.7B of regulatory assets under management on its latest SEC Form ADV. Its 13F, which covers only US-listed stocks and options, totals $380.1M.