What does Corundum Group, Inc. hold?

Corundum Group, Inc.'s 13F holdings are disclosed quarterly in Form 13F-HR filings on SEC EDGAR. Full top-holdings list, quarter-over-quarter position changes, and sector allocation breakdown are available at https://13fpro.ai/research/fund/1486083.

What is Corundum Group, Inc.'s AUM?

Corundum Group, Inc. reported approximately $337.1M in 13F-reportable AUM as of 2026-06-30. This figure reflects long US-listed positions disclosed on Form 13F-HR and excludes non-13F-reportable holdings (cash, short positions, certain derivatives, and non-US securities). Separately, the firm reported $1.7B in total regulatory AUM (RAUM) on its most recent Form ADV filing.

Where does 13F Pro source Corundum Group, Inc.'s holdings?

All Corundum Group, Inc. holdings data comes directly from SEC EDGAR Form 13F-HR filings under CIK 1486083. Data refreshes automatically each quarter as new 13F filings are submitted (typically within 45 days of quarter-end). 13F Pro applies no third-party rewrites or estimates.

How often is Corundum Group, Inc.'s 13F data updated on 13F Pro?

Corundum Group, Inc.'s holdings update on 13F Pro within hours of each new Form 13F-HR filing on SEC EDGAR. Quarterly position changes, accumulation/distribution flags, and sector allocation are recalculated on each refresh.

Corundum Group, Inc.

Institutional InvestorSimilar funds →SEC EDGAR: CIK 1486083

Institutional-grade research for retail investors

Sector Allocation

Other61.1%$206.1M
Technology11.6%$39.1M
Healthcare9.0%$30.3M
Industrials5.1%$17.2M
Financials5.1%$17.1M
Materials2.6%$8.8M
Consumer Discretionary1.4%$4.7M
Consumer Staples1.4%$4.6M
Utilities1.1%$3.7M
Energy1.1%$3.5M

AUM History

13fpro.ai/research/fund/corundum-group-inc-1486083

Conviction and streaks

Stable · top 10 = 54.0%

From the fund's last 12 quarters of 13F filings: positions held longest at size, and names it added to or trimmed several quarters running.

$Conviction hold12.6% weight · held 10 quarters

$Conviction hold12.0% weight · held 10 quarters

$Conviction hold5.1% weight · held 10 quarters

$MMMConviction hold4.8% weight · held 10 quarters

$Conviction hold4.1% weight · held 10 quarters

$Accumulating+45% shares · 5 quarters running

$Accumulating+31% shares · 5 quarters running

$Accumulating+32% shares · 5 quarters running

$Accumulating+60% shares · 5 quarters running

$KOAccumulating+25% shares · 5 quarters running

$MUTrimming-63% shares · 7 quarters running

$Trimming-28% shares · 5 quarters running

$Trimming-15% shares · 5 quarters running

$MRVLTrimming-67% shares · 4 quarters running

Largest positions — Q2 2026

ISHARES
$42.4M
ISHARES
$40.5M
ISHARES
$17.1M
MMM
$16.1M
ISHARES
$13.7M
ISHARES
$11.7M
ISHARES
$11.2M
ISHARES
$10.2M
LMT
$9.7M
SPY
$9.4M
ISHARES
$7.4M
LIN
$7.2M
AAPL
$7.1M
VANGUARD
$5.1M
MSFT
$4.7M
ISHARES
$4.5M
ISHARES
$4.2M
INTC
$4.2M
CAT
$3.6M
INVESCO
$3.5M

Top 20 stock positions. Options are left out: 13F reports them at the underlying's value.

13fpro.ai/research/fund/corundum-group-inc-1486083

Corundum Group, Inc. 13F holdings — Q2 2026

$337.1M portfolio (+12.7% QoQ) · 112 holdings · Q2 2026 13F · top 10 are 54% of the stock portfolio

1
ISHARES RUSSELL 1000 GROWTH ET - CS
$42.4M
12.6% of stocks
+300%This quarter—Since filed—Held
AIQuality—Est. buy—
2
ISHARES RUSSELL 1000 VALUE ETF - CS
$40.5M
12.0% of stocks
+0.9%This quarter—Since filed—Held
AIQuality—Est. buy—
3
ISHARES MSCI EAFE ETF - CS
$17.1M
5.1% of stocks
+2%This quarter—Since filed—Held
AIQuality—Est. buy—
4
3M CO
$MMM
$16.1M
4.8% of stocks
+0.2%This quarter-5.5%Since filed10+ qtrsHeld
AIQuality61.0#822Est. buyEstimated buy price is Pro: unlock with a free trial
5
ISHARES RUSSELL 2000 GROWTH ET - CS
$13.7M
4.1% of stocks
-2%This quarter—Since filed—Held
AIQuality—Est. buy—
6
ISHARES RUSSELL 2000 VALUE ETF - CS
$11.7M
3.5% of stocks
-0.8%This quarter—Since filed—Held
AIQuality—Est. buy—
7
ISHARES RUSSELL MID CAP GROWTH - CS
$11.2M
3.3% of stocks
+1%This quarter—Since filed—Held
AIQuality—Est. buy—
8
ISHARES RUSSELL MID CAP VALUE - CS
$10.2M
3.0% of stocks
-10%This quarter—Since filed—Held
AIQuality—Est. buy—
9
LOCKHEED MARTIN CORP
$LMT
$9.7M
2.9% of stocks
No changeThis quarter+8.0%Since filed3 qtrsHeld
AIQuality64.9#503Est. buyEstimated buy price is Pro: unlock with a free trial
10
SPDR S&P 500 ETF TRUST
$SPY
$9.4M
2.8% of stocks
+1%This quarter-1.0%Since filed10+ qtrsHeld
AIQuality—Est. buyEstimated buy price is Pro: unlock with a free trial

#	Company	Value	Weight	This quarter	Since filed	Held	AI quality	Est. buy
1	ISHARES RUSSELL 1000 GROWTH ET - CS	$42.4M	12.6%	+300%	—	—	—	—
2	ISHARES RUSSELL 1000 VALUE ETF - CS	$40.5M	12.0%	+0.9%	—	—	—	—
3	ISHARES MSCI EAFE ETF - CS	$17.1M	5.1%	+2%	—	—	—	—
4	3M CO$MMM	$16.1M	4.8%	+0.2%	-5.5%	10+ qtrs	61.0#822	Estimated buy price is Pro: unlock with a free trial
5	ISHARES RUSSELL 2000 GROWTH ET - CS	$13.7M	4.1%	-2%	—	—	—	—
6	ISHARES RUSSELL 2000 VALUE ETF - CS	$11.7M	3.5%	-0.8%	—	—	—	—
7	ISHARES RUSSELL MID CAP GROWTH - CS	$11.2M	3.3%	+1%	—	—	—	—
8	ISHARES RUSSELL MID CAP VALUE - CS	$10.2M	3.0%	-10%	—	—	—	—
9	LOCKHEED MARTIN CORP$LMT	$9.7M	2.9%	No change	+8.0%	3 qtrs	64.9#503	Estimated buy price is Pro: unlock with a free trial
10	SPDR S&P 500 ETF TRUST$SPY	$9.4M	2.8%	+1%	-1.0%	10+ qtrs	—	Estimated buy price is Pro: unlock with a free trial

All holdings — Corundum Group, Inc. (Q2 2026)

Sort

112 disclosed positions from the Form 13F-HR on SEC EDGAR, with quarter-over-quarter share changes. Largest by value first; the ten above are not repeated.

#		Company						Held		Source
11	—	ISHARES TRUST ISHARES ESG OPTI - CSetf/fund	—	$7.4M	2.2%	48K	-4%	—	—	13F
12	$LIN	LINDE PLC	Materials	$7.2M	2.1%	14K	-12%	3 qtrsTrimmed 2 qtrs in a row	—	13F
13	$AAPL	Apple Inc.	Technology	$7.1M	2.1%	24K	+4%	10+ qtrs	75.7	13F
14	—	VANGUARD RUSSELL 1000 VALUE ET - CSetf/fund	—	$5.1M	1.5%	48K	+1%	—	—	13F
15	$MSFT	MICROSOFT CORP	Technology	$4.7M	1.4%	13K	+0.4%	10+ qtrs	AI quality score is Pro: unlock with a free trial	13F
16	—	ISHARES RUSSELL 1000 ETF - CSetf/fund	—	$4.5M	1.3%	11K	+2%	—	—	13F
17	—	ISHARES RUSSELL 2000 ETF - CSetf/fund	—	$4.2M	1.3%	14K	+3%	—	—	13F
18	$INTC	INTEL CORP	Technology	$4.2M	1.2%	30K	+0.3%	6 qtrs	AI quality score is Pro: unlock with a free trial	13F
19	$CAT	CATERPILLAR INC	Industrials	$3.6M	1.1%	3,337	-0.7%	10+ qtrs	AI quality score is Pro: unlock with a free trial	13F
20	—	INVESCO EXCHANGE TRADED FD TR - CS	—	$3.5M	1.1%	47K	+2%	—	—	13F
21	$NVDA	NVIDIA CORP	Technology	$3.5M	1.0%	17K	+3%	10+ qtrsAdded 2 qtrs in a row	AI quality score is Pro: unlock with a free trial	13F
22	$GOOGL	Alphabet Inc.	Technology	$3.5M	1.0%	9,763	+1%	10+ qtrs	AI quality score is Pro: unlock with a free trial	13F
23	$GLD	SPDR GOLD TRUSTetf/fund	Financials	$3.5M	1.0%	9,401	+0.1%	10+ qtrs	AI quality score is Pro: unlock with a free trial	13F
24	$GOOG	Alphabet Inc.	Technology	$3.4M	1.0%	9,510	+6%	10+ qtrsAdded 2 qtrs in a row	AI quality score is Pro: unlock with a free trial	13F
25	—	SPDR SERIES TRUST STATE STREET - CSetf/fund	—	$3.3M	1.0%	37K	+11%	—	—	13F
26	$JPM	JPMORGAN CHASE & CO	Financials	$3.2M	0.9%	9,835	+0.9%
27	—	VANGUARD S&P 500 ETF - CS	—	$2.9M	0.8%	4,152	+5%
28	—	ISHARES S&P 500 GROWTH ETF - CS	—	$2.8M	0.8%	20K	-0.3%
29	$XOM.R34088	EXXON MOBIL CORP	Energy	$2.6M	0.8%	19K	+1%
30	$AVGO	Broadcom Inc.	Technology	$2.6M	0.8%	6,786	-0.5%
31	—	SELECT SECTOR SPDR TRUST STATE - CS	—	$2.4M	0.7%	53K	+3%
32	$CSCO	CISCO SYSTEMS, INC.	Technology	$2.4M	0.7%	20K	+0.2%
33	—	FIRST TRUST GLOBAL TACTICAL CO - CS	—	$2.3M	0.7%	84K	+1%
34	—	NUSHARES ETF TR SMALL CAP ETF - CS	—	$2.3M	0.7%	43K	-4%
35	—	ISHARES CORE S&P MID CAP ETF - CS	—	$2.1M	0.6%	27K	-2%
36	$AMZN	AMAZON COM INC	Consumer Discretionary	$2.0M	0.6%	8,601	+2%
37	$V	VISA INC.	Financials	$2.0M	0.6%	5,950	+0.7%
38	$LLY	ELI LILLY & Co	Healthcare	$2.0M	0.6%	1,681	+0.6%
39	$ABBV	AbbVie Inc.	Healthcare	$2.0M	0.6%	8,000	-0.7%
40	$JNJ	JOHNSON & JOHNSON	Healthcare	$2.0M	0.6%	7,755	-0.3%
41	$GS	GOLDMAN SACHS GROUP INC	Financials	$1.9M	0.6%	1,897	+0.5%
42	$USB	US BANCORP \DE\	Financials	$1.7M	0.5%	28K	+0.7%
43	$ECL	ECOLAB INC.	Materials	$1.6M	0.5%	5,646	-0.2%
44	$BMY	BRISTOL MYERS SQUIBB CO	Healthcare	$1.5M	0.4%	26K	+0.3%
45	$HD	HOME DEPOT, INC.	Consumer Discretionary	$1.4M	0.4%	4,102	+1%
46	$BAC	BANK OF AMERICA CORP /DE/	Financials	$1.4M	0.4%	25K	+1%
47	$COST	COSTCO WHOLESALE CORP /NEW	Consumer Staples	$1.4M	0.4%	1,507	+2%
48	$MRK	Merck & Co., Inc.	Healthcare	$1.4M	0.4%	11K	+2%
49	$DUK	Duke Energy CORP	Utilities	$1.3M	0.4%	11K	-1%
50	$WM	WASTE MANAGEMENT INC	Utilities	$1.3M	0.4%	6,016	+1%
51	$WMT	Walmart Inc.	Consumer Staples	$1.3M	0.4%	12K	+2%
52	$AMGN	AMGEN INC	Healthcare	$1.3M	0.4%	3,678	+1%
53	—	ISHARES S&P 500 VALUE ETF - CS	—	$1.3M	0.4%	5,790	-3%
54	$BRK.B	BERKSHIRE HATHAWAY INC	Financials	$1.3M	0.4%	2,589	+1%
55	$MA	Mastercard Inc	Financials	$1.3M	0.4%	2,508	+1%
56	$ORCL	ORACLE CORP	Technology	$1.2M	0.4%	8,301	+2%
57	$MU	MICRON TECHNOLOGY INC	Technology	$1.2M	0.4%	1,038	-1.0%
58	$KO	COCA COLA CO	Consumer Staples	$1.0M	0.3%	12K	+4%
59	$BA	BOEING CO	Industrials	$998K	0.3%	4,610	New
60	$META	Meta Platforms, Inc.	Technology	$983K	0.3%	1,745	New
61	$ADP	AUTOMATIC DATA PROCESSING INC	Technology	$974K	0.3%	4,347	+1%
62	$CVX	CHEVRON CORP	Energy	$974K	0.3%	5,873	+4%
63	$MCD	MCDONALDS CORP	Consumer Discretionary	$921K	0.3%	3,408	+2%
64	$ABT	ABBOTT LABORATORIES	Healthcare	$889K	0.3%	9,802	-1%
65	$PG	PROCTER & GAMBLE Co	Consumer Staples	$873K	0.3%	5,954	+3%
66	$FDX	FEDEX CORP	Industrials	$871K	0.3%	2,782	+3%
67	$MDT	Medtronic plc	Healthcare	$837K	0.3%	11K	+4%
68	$PFE	PFIZER INC	Healthcare	$825K	0.2%	34K	+4%
69	$UPS	UNITED PARCEL SERVICE INC	Industrials	$816K	0.2%	7,593	+3%
70	$XEL	XCEL ENERGY INC	Utilities	$796K	0.2%	9,911	+3%
71	$DIS	Walt Disney Co	Communication Services	$779K	0.2%	8,097	+5%
72	$VZ	VERIZON COMMUNICATIONS INC	Communication Services	$745K	0.2%	18K	+5%
73	$ANET	Arista Networks, Inc.	Technology	$740K	0.2%	4,356	+49%
74	—	ISHARES S&P MID CAP 400 GROWTH - CS	—	$736K	0.2%	6,265	-11%
75	$TXN	TEXAS INSTRUMENTS INC	Technology	$634K	0.2%	2,128	-2%
76	$SOLV	Solventum Corp	Healthcare	$634K	0.2%	8,214	—
77	$GE	GENERAL ELECTRIC CO	Industrials	$579K	0.2%	1,548	+0.6%
78	$TSM	TAIWAN SEMICONDUCTOR MANUFACTURING CO LTD	Technology	$561K	0.2%	1,174	-9%
79	—	LEGG MASON ETF INVT TR CLEARBR - CS	—	$547K	0.2%	6,389	—
80	$QQQ	INVESCO QQQ TRUST, SERIES 1	—	$520K	0.1%	706	—
81	—	HONEYWELL AEROSPACE INC COMMON - CS	—	$497K	0.1%	2,247	New
82	$HON	HONEYWELL INTERNATIONAL INC	Industrials	$442K	0.1%	1,976	-47%
83	—	ISHARES CORE S&P SMALL CAP ETF - CS	—	$421K	0.1%	2,840	-61%
84	—	DBX ETF TRUST XTRACKERS S&P 50 - CS	—	$403K	0.1%	5,852	+0.9%
85	$PANW	Palo Alto Networks Inc	Technology	$346K	0.1%	1,015	-26%
86	—	DIMENSIONAL ETF TRUST DIMENSIO - CS	—	$343K	0.1%	4,908	-19%
87	—	NUVEEN ESG INTERNATIONAL DEVEL - CS	—	$338K	0.1%	8,456	+0.7%
88	—	DIMENSIONAL ETF TRUST DIMENSIO - CS	—	$332K	0.1%	4,054	—
89	$DHR	DANAHER CORP /DE/	Healthcare	$312K	0.1%	1,640	+4%
90	$CDNS	CADENCE DESIGN SYSTEMS INC	Technology	$298K	0.1%	795	-2%
91	—	ISHARES TRUST ISHARES MSCI USA - CS	—	$285K	0.1%	1,300	—
92	$MRVL	Marvell Technology, Inc.	Technology	$283K	0.1%	950	-57%
93	—	VANGUARD INDEX FUNDS VANGUARD - CS	—	$283K	0.1%	3,282	+500%
94	$SPOT	Spotify Technology S.A.	Communication Services	$278K	0.1%	606	+24%
95	$PGR	PROGRESSIVE CORP/OH/	Financials	$276K	0.1%	1,265	-0.8%
96	—	VANGUARD INDEX FUNDS VANGUARD - CS	—	$267K	0.1%	3,320	+300%
97	—	VANGUARD BD INDEX FDS VANGUARD - CS	—	$252K	0.1%	5,069	—
98	$WST	WEST PHARMACEUTICAL SERVICES INC	Healthcare	$252K	0.1%	701	New
99	$UBER	Uber Technologies, Inc	Technology	$249K	0.1%	3,445	+10%
100	$ISRG	INTUITIVE SURGICAL INC	Healthcare	$248K	0.1%	624	+9%
101	$AJG	Arthur J. Gallagher & Co.	Financials	$248K	0.1%	1,079	-2%
102	—	DIMENSIONAL ETF TRUST DIMENSIO - CS	—	$238K	0.1%	4,331	—
103	$CTAS	CINTAS CORP	Consumer Discretionary	$238K	0.1%	1,400	New
104	$DDOG	Datadog, Inc.	Technology	$234K	0.1%	898	New
105	$RSG	REPUBLIC SERVICES, INC.	Utilities	$226K	0.1%	1,061	-0.8%
106	$MPWR	MONOLITHIC POWER SYSTEMS, INC.	Technology	$221K	0.1%	160	-32%
107	—	VANGUARD FTSE DEVELOPED MARKET - CS	—	$218K	0.1%	3,065	New
108	$SCHW	SCHWAB CHARLES CORP	Financials	$218K	0.1%	2,360	+9%
109	$MDY	SPDR S&P MIDCAP 400 ETF TRUST	—	$211K	0.1%	300	New
110	$MTN	VAIL RESORTS INC	Communication Services	$204K	0.1%	1,500	New
111	$FDXF	FedEx Freight Holding Company, Inc.	Industrials	$202K	0.1%	1,340	New
112	—	FUTUREONE INC - CS	—	$0	0.0%	100K	—

What changed in Q2 2026

Against the previous quarter's 13F: 10 new, 63 added to, 30 trimmed, 6 sold out. Share-count changes; largest moves by dollar size first.

New positions (10)

$BABOEING CO$998K
first bought this quarter
$METAMeta Platforms, Inc.$983K
first bought this quarter
HONEYWELL AEROSPACE INC COMMON - CS$497K
first bought this quarter
$WSTWEST PHARMACEUTICAL SERVICES INC$252K
first bought this quarter
$CTASCINTAS CORP$238K
first bought this quarter
$DDOGDatadog, Inc.$234K
first bought this quarter

+4 more in the Excel export

Added to (63)

ISHARES RUSSELL 1000 GROWTH ET - CS+300%
now $42.4M
ISHARES RUSSELL 1000 VALUE ETF - CS+0.9%
now $40.5M
SPDR SERIES TRUST STATE STREET - CS+11%
now $3.3M
$AAPLApple Inc.+4%
now $7.1M · held 10+ qtrs
ISHARES MSCI EAFE ETF - CS+2%
now $17.1M
$ANETArista Networks, Inc.+49%
now $740K · held 7 qtrs

+57 more in the Excel export

Trimmed (30)

ISHARES RUSSELL MID CAP VALUE - CS-10%
now $10.2M
$LINLINDE PLC-12%
now $7.2M · held 3 qtrs, 2 trims in a row
ISHARES CORE S&P SMALL CAP ETF - CS-61%
now $421K
$HONHONEYWELL INTERNATIONAL INC-47%
now $442K · held 10+ qtrs
$MRVLMarvell Technology, Inc.-57%
now $283K · held 2 qtrs
ISHARES TRUST ISHARES ESG OPTI - CS-4%
now $7.4M

+24 more in the Excel export

Sold out (6)

$TSCOTRACTOR SUPPLY CO /DE/was $359K
held 9+ qtrs
ISHARES TRUST ISHARES 0 3 MONTwas $242K
$KKRKKR & Co. Inc.was $223K
held 2 qtrs
ISHARES S&P SMALL CAP 600 GROWwas $210K
$INTUINTUIT INC.was $207K
$VLTOVeralto Corpwas $205K

Firm AUM (Form ADV): $1.7B as of 2025-12-31 · SEC IAPD

Holdings by quarter

Every 13F Corundum Group, Inc. has filed, 37 earlier quarters. Pick one to see what it held then.

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Is it too late to follow Corundum Group?

Q2 2026 13F filed with the SEC on Aug 7, 2026. Prices are closing prices as of Oct 26, 2026.

Average quality of Corundum Group's top 20 holdings: 69/100 (our AI quality score, weighted by position size; 17 of the 20 are scored)

Top 10 since filing

-0.8%

Value-weighted move of the 10 largest stock positions

Turnover

Last quarter; 12% over the last 4

Top 10 weight

54%

Share of the stock portfolio in its 10 largest positions

Held 4+ quarters

83%

Share of portfolio value in positions held a year or more

Highest-quality names it owns(among its 100 largest positions)

The 8 highest-scoring companies in this portfolio are a Pro feature.

How these are measured

Moves since the quarter-end and since the filing date use our own daily closing prices, from the close on (or just before) each date to the latest close.
Turnover is the lesser of shares bought or sold in a quarter, valued at the quarter-end prices in the 13F, divided by the average of the two quarters' stock portfolio values.
Quarters held and add/trim streaks count back only through quarters whose filed holdings add up to the filing's own cover-page total (back to Q1 2024 for this fund). A change counts as an add or a trim when the split-adjusted share count moves by more than 1%.
Estimate, not the fund's reported cost. For each quarter in the current holding period in which the fund's share count rose (split-adjusted), we take that quarter's average daily close and weight it by the shares added; sales do not change an average cost. Quarters where the stock's price history and the 13F's own implied price disagree by more than 2x are left out.
Put and call option rows report the value of the underlying shares, not a position the fund paid for, so they are left out of all of the above.

Portfolio Overview

Corundum Group, Inc. disclosed 112 positions worth $337.1M in its Form 13F-HR for Q2 2026. During the quarter the fund opened 10 new positions and exited 6 — including a new stake in $BA and a full exit from $TSCO. The portfolio is most concentrated in Other (61.1% of disclosed assets). All figures are sourced directly from Corundum Group, Inc.’s Form 13F-HR filing with the SEC under CIK 1486083.

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AI-Powered Hedge Fund Analysis: Corundum Group, Inc.

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Every holding in Corundum Group, Inc.'s portfolio is scored on an AI quality ranking built from its SEC filings (ROIC, FCF margin, revenue growth, institutional flow, earnings quality, shareholder dilution, and more). Track accumulation and distribution quarter over quarter, identify conviction positions, and see AI stock analysis for each position — alongside 8,700+ other institutional filers and 2,800+ AI-ranked companies.