Institutional Manager · CIK 0001486083

Corundum Group, Inc.

COLORADO SPRINGS, CO · File #028-13880

Latest AUM

$298.0M

Positions

113

Top-10 Concentration

61.3%

Filings

Portfolio Value Over Time

2024-03

2024-06

2024-09

2024-12

2025-03

2025-06

2025-09

2025-12

Biggest QoQ Changes

Ranked by conviction flow (share change × current price) so mark-to-market moves don't dominate. Price effect column shows how much of the $ change was just the stock moving.

Action	Issuer	Ticker / CUSIP	Δ Shares	Flow ($)	Price Effect
NEW	LOCKHEED MARTIN CORP	LMT	+25,760	+$12.5M	$0
NEW	LINDE PLC ORDINARY SHARES	LIN	+23,722	+$10.1M	$0
ADD	ISHARES RUSSELL 1000 VALUE ETF	464287598	+40,326	+$8.5M	+$828,401
ADD	ISHARES RUSSELL 1000 GROWTH ET	464287614	+11,354	+$5.4M	+$316,765
ADD	SPDR SERIES TRUST STATE STREET	78464a854	+35,713	+$2.9M	+$6,518
ADD	ISHARES MSCI EAFE ETF	464287465	+26,967	+$2.6M	+$341,946
ADD	ISHARES RUSSELL MID CAP VALUE	464287473	+15,786	+$2.2M	+$71,899
ADD	ISHARES RUSSELL MID CAP GROWTH	464287481	+14,554	+$2.0M	-$295,561
ADD	ISHARES RUSSELL 2000 VALUE ETF	464287630	+10,244	+$1.9M	+$191,950
ADD	ISHARES RUSSELL 2000 GROWTH ET	464287648	+5,381	+$1.7M	+$85,845

Sector Allocation

11.2%$33.3M

8.1%$24.2M

4.0%$12.0M

3.4%$10.1M

2.8%$8.3M

Consumer Discretionary

1.6%$4.9M

Consumer Staples

1.3%$3.9M

Energy

0.9%$2.9M

Communication Services

0.1%$250,174

Filing History

Jan 12, 202613F HOLDINGS REPORTQ/E Dec 2025113 pos · $298.0M
Oct 24, 202513F HOLDINGS REPORTQ/E Sep 2025103 pos · $243.4M
Jul 21, 202513F HOLDINGS REPORTQ/E Jun 2025103 pos · $226.2M
Apr 23, 202513F HOLDINGS REPORTQ/E Mar 202598 pos · $208.5M
Jan 16, 202513F HOLDINGS REPORTQ/E Dec 2024100 pos · $267.8M
Oct 21, 202413F HOLDINGS REPORTQ/E Sep 2024100 pos · $219.2M
Jul 17, 202413F HOLDINGS REPORTQ/E Jun 2024101 pos · $256.0M
Apr 15, 202413F HOLDINGS REPORTQ/E Mar 202498 pos · $207.3M
Oct 17, 202313F HOLDINGS REPORTQ/E Dec 2023102 pos · $176.0M

Top 20 Holdings — Dec 2025

#	Issuer	Ticker	Shares	Value	% of Portfolio
1	ISHARES RUSSELL 1000 GROWTH ET	464287614	76,132	$36.0M	13.52%
2	ISHARES RUSSELL 1000 VALUE ETF	464287598	163,052	$34.3M	12.87%
3	3M COMPANY	MMM	97,999	$15.7M	5.89%
4	ISHARES MSCI EAFE ETF	464287465	155,518	$14.9M	5.61%
5	LOCKHEED MARTIN CORP	LMT	25,760	$12.5M	4.68%
6	ISHARES RUSSELL 2000 GROWTH ET	464287648	34,285	$11.1M	4.16%
7	LINDE PLC ORDINARY SHARES	LIN	23,722	$10.1M	3.80%
8	ISHARES RUSSELL 2000 VALUE ETF	464287630	53,869	$9.8M	3.66%
9	ISHARES RUSSELL MID CAP VALUE	464287473	67,887	$9.6M	3.59%
10	ISHARES RUSSELL MID CAP GROWTH	464287481	68,587	$9.4M	3.53%
11	SPDR S&P 500 ETF TRUST	SPY	12,277	$8.4M	3.14%
12	MICROSOFT CORP	MSFT	15,256	$7.4M	2.77%
13	ISHARES TRUST ISHARES ESG OPTI	464288802	51,082	$7.1M	2.67%
14	APPLE INC	AAPL	23,469	$6.4M	2.39%
15	VANGUARD RUSSELL 1000 VALUE ET	92206c714	40,341	$3.7M	1.40%
16	SPDR GOLD SHARES ETF	GLD	8,687	$3.4M	1.29%
17	ALPHABET INC CLASS A COMMON ST	GOOG	10,542	$3.3M	1.24%
18	ISHARES RUSSELL 1000 ETF	464287622	8,798	$3.3M	1.23%
19	SPDR SERIES TRUST STATE STREET	78464a854	39,180	$3.1M	1.18%
20	JPMORGAN CHASE & CO	VYLD	9,675	$3.1M	1.17%