CG
Corundum Group, Inc. 13F Filings & Institutional Holdings (Q2 2026)
Corundum Group, Inc.CIK: 0001486083
Diversified strategyMomentum followerQuality / disciplined sizing
Total reported value
$337.1M
Reporting period: 2026-06-30 · Number of holdings: 112
Corundum Group, Inc. disclosed 112 holdings in its latest 13F filing for the period ending 2026-06-30, with total reported value of $337.1M and a quarterly turnover rate of 18.4%.
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Personality snowflake
- Concentration
- 18.34
- Portfolio Stability
- 18.39
- Momentum
- 100
- Sector conviction
- 54.26
- Diversification
- 100
- Sizing Uniformity
- 79.57
Corundum Group, Inc.'s disclosed holdings carry a Herfindahl concentration index of 0.046 — mathematically equivalent to about 22 equally-sized positions, well below its 112 actual disclosed holdings. That gap points to a strategy built around a small core of high-conviction bets rather than broad diversification.
Position sizes vary widely across the portfolio (a coefficient of variation of 2.04), with a handful of outsized bets alongside many smaller positions.
No strong tilt toward either adding to existing winners or initiating outsized new positions was observed in the latest reported quarter.
Sector classification currently covers about 36% of this portfolio's disclosed value; the remainder includes holdings (e.g. unmapped tickers, options, or other security types) not yet covered by our sector mapping.
Source and citation information
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Recent moves
View source Form 13F filing on SEC.govSold out XOM
Trim LMT
0.0% -$1.8M
Add INTC
+0.3% $2.9M
New buy 30233Q108
Trim LIN
-12.3% -$644.2K
Add IWF
+300.0% $6.0M
Holdings Map
New buyAddUnchangedTrim
Top 10 holdings by weight
Full holdings list this quarter
| # | Ticker | Issuer | Asset Subclass | Weight | Weight Change | Shares Change | 4Q Trend |
|---|---|---|---|---|---|---|---|
| 1 | IWF | Ishares Russell 1000 Growth | ETF-Other | 12.59% | +0.42% | +300.00% | |
| 2 | IWD | Ishares Russell 1000 Value E | ETF-Other | 12.02% | +0.18% | +0.89% | |
| 3 | EFA | Ishares Msci Eafe ETF | ETF-Other | 5.08% | -0.19% | +1.54% | |
| 4 | MMM | 3m Co | Stock-Industrials | 4.77% | -0.04% | +0.23% | |
| 5 | IWO | Ishares Russell 2000 Growth | ETF-Small Cap | 4.06% | +0.36% | -1.68% | |
| 6 | IWN | Ishares Russell 2000 Value E | ETF-Small Cap | 3.48% | +0.09% | -0.81% | |
| 7 | IWP | Ishares Russell Mid-cap Grow | ETF-Other | 3.31% | +0.08% | +1.09% | |
| 8 | IWS | Ishares Russell Mid-cap Valu | ETF-Other | 3.02% | -0.33% | -10.19% | |
| 9 | LMT | Lockheed Martin CORP | Stock-Industrials | 2.88% | -0.97% | — | |
| 10 | SPY | Ss Spdr S&p 500 ETF Trust-us | ETF-Large Cap & Growth | 2.78% | +0.09% | +1.21% | |
| 11 | SUSA | Ishares Esg Optimized Msci U | ETF-Other | 2.19% | -0.02% | -4.41% | |
| 12 | LIN | Linde plc | Stock-Materials | 2.14% | -0.49% | -12.29% | |
| 13 | AAPL | Apple Inc | Stock-Tech | 2.10% | +0.11% | +4.00% | |
| 14 | VONV | Vanguard Russell 1000 Value | ETF-Other | 1.51% | +0.03% | +1.41% | |
| 15 | MSFT | Microsoft CORP | Stock-Tech | 1.38% | -0.16% | +0.41% | |
| 16 | IWB | Ishares Russell 1000 ETF | ETF-Other | 1.33% | +0.05% | +2.41% | |
| 17 | IWM | Ishares Russell 2000 ETF | ETF-Small Cap | 1.25% | +0.12% | +2.76% | |
| 18 | INTC | Intel CORP | Stock-Tech | 1.24% | +0.80% | +0.27% | |
| 19 | CAT | Caterpillar Inc | Stock-Industrials | 1.05% | +0.25% | -0.66% | |
| 20 | SPLV | Invesco S&p 500 Low Volatili | ETF-Large Cap & Growth | 1.05% | -0.08% | +2.11% | |
| 21 | NVDA | Nvidia CORP | Stock-Tech | 1.04% | +0.05% | +3.04% | |
| 22 | GOOGL | Alphabet Inc-cl A | Stock-Comm Services | 1.03% | +0.10% | +1.01% | |
| 23 | GLD | Spdr Gold Shares | ETF-Commodities | 1.03% | -0.32% | +0.11% | |
| 24 | GOOG | Alphabet Inc-cl C | Stock-Comm Services | 1.00% | +0.14% | +5.98% | |
| 25 | SPYM | Ste Str Spdr Pt S&p 500 ETF | ETF-Large Cap & Growth | 0.97% | +0.11% | +10.93% | |
| 26 | JPM | Jpmorgan Chase & Co | Stock-Financials | 0.95% | -0.01% | +0.89% | |
| 27 | VOO | Vanguard S&p 500 ETF | ETF-Large Cap & Growth | 0.85% | +0.06% | +5.27% | |
| 28 | IVW | Ishares S&p 500 Growth ETF | ETF-Large Cap & Growth | 0.83% | +0.05% | -0.32% | |
| 29 | ✓ | Stock-Other | 0.76% | +0.76% | NEW | ||
| 30 | AVGO | Broadcom Inc | Stock-Tech | 0.76% | +0.05% | -0.50% | |
| 31 | XLU | St Sr Utl Sl Se Spdr Etf-usd | ETF-Other | 0.72% | -0.08% | +2.75% | |
| 32 | CSCO | Cisco Systems Inc | Stock-Tech | 0.71% | +0.18% | +0.19% | |
| 33 | FTGC | First Trust Global Tactical | ETF-Other | 0.68% | -0.12% | +1.18% | |
| 34 | NUSC | Nuveen Esg Small-cap ETF | ETF-Other | 0.67% | -0.01% | -4.48% | |
| 35 | IJH | Ishares Core S&p Midcap ETF | ETF-Other | 0.62% | — | -2.17% | |
| 36 | AMZN | Amazon.com Inc | Stock-Consumer Disc | 0.61% | +0.02% | +1.79% | |
| 37 | V | Visa Inc-class A Shares | Stock-Financials | 0.61% | +0.01% | +0.74% | |
| 38 | LLY | Eli Lilly & Co | Stock-Healthcare | 0.60% | +0.09% | +0.60% | |
| 39 | ABBV | Abbvie Inc | Stock-Healthcare | 0.60% | +0.01% | -0.68% | |
| 40 | JNJ | Johnson & Johnson | Stock-Healthcare | 0.58% | -0.06% | -0.30% | |
| 41 | GS | Goldman Sachs Group Inc | Stock-Financials | 0.57% | +0.04% | +0.53% | |
| 42 | USB | US Bancorp | Stock-Financials | 0.50% | +0.02% | +0.71% | |
| 43 | ECL | Ecolab Inc | Stock-Materials | 0.47% | -0.03% | -0.16% | |
| 44 | BMY | Bristol-myers Squibb Co | Stock-Healthcare | 0.44% | -0.08% | +0.34% | |
| 45 | HD | Home Depot Inc | Stock-Consumer Disc | 0.43% | -0.02% | +1.21% | |
| 46 | BAC | Bank Of America CORP | Stock-Financials | 0.42% | +0.02% | +1.05% | |
| 47 | COST | Costco Wholesale CORP | Stock-Consumer Staples | 0.42% | -0.07% | +1.89% | |
| 48 | MRK | Merck & Co. Inc. | Stock-Healthcare | 0.41% | -0.01% | +1.95% | |
| 49 | DUK | Duke Energy CORP | Stock-Utilities | 0.40% | -0.07% | -1.36% | |
| 50 | WM | Waste Management Inc | Stock-Industrials | 0.40% | -0.06% | +1.11% |
1–50 of 112
Portfolio Performance
Performance for Q3 2026
+4.3%
Performance Last 4 Quarters
+20.5%
- Stdev
- +12.1%
- Beta
- +0.87
- Alpha
- +0.5%
- Max Drawdown
- -7.3%
- Annualized Perf
- +18.6%
- Batting Avg vs S&P
- +36.1%
- Sortino
- +2.78
- Stutzer
- +0.43
- Treynor
- +0.21
- Sterling
- +1.19
- Calmar
- +2.57
- Information Ratio
- -0.44
- Tracking Error
- +4.7%
- Stdev Down
- +6.5%
- Winning Months %
- +69.4%
- Losing Months %
- +30.6%
- Best 12 Months
- +33.5%
- Worst 12 Months
- +8.4%
- Efficiency Ratio
- +0.58
- Sharpe
- +1.48
- Stdev Sectors
- +9%
- Skewness
- -0.34
- Kurtosis
- -0.43
- Upside Potential
- +4.39
Reported value over time
Sector allocation
Sector allocation over time
Quarterly history
| Period | Holdings | Total value | Stability | Top holdings | |
|---|---|---|---|---|---|
| 2026 Q2 | 112 | $337.1M | 18 | ||
| 2026 Q1 | 108 | $299.2M | 13 | ||
| 2025 Q4 | 113 | $298.0M | 27 | ||
| 2025 Q3 | 103 | $243.4M | 20 | ||
| 2025 Q2 | 103 | $226.2M | 0 | ||
| 2025 Q1 | 98 | $208.5M | 100 | ||
| 2024 Q4 | 100 | $267.8M | 0 | ||
| 2024 Q3 | 100 | $219.2M | 0 | ||
| 2024 Q2 | 101 | $256.0M | 0 | ||
| 2024 Q1 | 98 | $207.3M | 0 | ||
| 2023 Q4 | 100 | $199.4M | 0 | ||
| 2023 Q3 | 102 | $176.0M | 0 | ||
| 2023 Q2 | 116 | $200.5M | 0 | ||
| 2023 Q1 | 100 | $211.4M | 0 | ||
| 2022 Q4 | 101 | $177.1M | 0 | ||
| 2022 Q3 | 107 | $159.0M | 0 | ||
| 2022 Q2 | 97 | $148.0M | 0 | ||
| 2022 Q1 | 99 | $107.6M | 0 | ||
| 2021 Q4 | 104 | $153.6M | 0 | ||
| 2021 Q3 | 94 | $134.9M | 0 | ||
| 2021 Q2 | 103 | $152.5M | 91 | ||
| 2021 Q1 | 91 | $128.0M | 9 | ||
| 2020 Q4 | 93 | $120.0M | 18 | ||
| 2020 Q3 | 87 | $103.2M | 23 | ||
| 2020 Q2 | 62 | $83.4M | 21 | ||
| 2020 Q1 | 60 | $70.3M | 32 | ||
| 2019 Q4 | 73 | $95.2M | 11 | ||
| 2019 Q3 | 66 | $86.3M | 4 | ||
| 2019 Q2 | 70 | $87.0M | 9 | ||
| 2019 Q1 | 71 | $87.4M | 38 | ||
| 2018 Q4 | 77 | $108.9M | 46 | ||
| 2018 Q2 | 55 | $81.1M | 20 | ||
| 2018 Q1 | 55 | $92.5M | 6 | ||
| 2017 Q4 | 51 | $92.7M | 12 | ||
| 2017 Q3 | 50 | $94.9M | 72 | ||
| 2017 Q2 | 35 | $45.1M | 73 | ||
| 2017 Q1 | 30 | $79.3M | 16 | ||
| 2016 Q4 | 28 | $68.0M | 20 | ||
| 2016 Q3 | 27 | $61.8M | 22 | ||
| 2016 Q2 | 27 | $65.0M | 68 | ||
| 2016 Q1 | 23 | $38.0M | 18 | ||
| 2015 Q4 | 20 | $33.4M | 18 | ||
| 2015 Q3 | 13 | $28.2M | 19 | ||
| 2015 Q2 | 13 | $28.4M | 7 | ||
| 2015 Q1 | 13 | $29.6M | 22 | ||
| 2014 Q4 | 15 | $24.8M | 19 | ||
| 2014 Q3 | 13 | $21.1M | 10 | ||
| 2014 Q2 | 13 | $21.3M | 10 | ||
| 2014 Q1 | 11 | $20.6M | 5 | ||
| 2013 Q4 | 12 | $21.3M | 21 | ||
| 2013 Q3 | 9 | $17.9M | 10 | ||
| 2013 Q2 | 8 | $16.2M | 0 |
Holding changes this quarter
Corundum Group, Inc.'s most significant position changes for 2026-06-30: Sold out: Exxon Mobil CORP (XOM); New buy: ; New buy: Boeing Co/the (BA); New buy: Meta Platforms Inc-class A (META); Sold out: Honeywell International Inc (HON).
| # | Ticker | Issuer | Weight Change | Shares Change | Action |
|---|---|---|---|---|---|
| 1 | INTC | Intel CORP | +0.8% | +0.27% | Add |
| 2 | ✓ | +0.8% | NEW | New buy | |
| 3 | IWF | Ishares Russell 1000 Growth | +0.4% | +300.00% | Add |
| 4 | IWO | Ishares Russell 2000 Growth | +0.4% | -1.68% | Trim |
| 5 | BA | Boeing Co/the | +0.3% | NEW | New buy |
| 6 | META | Meta Platforms Inc-class A | +0.3% | NEW | New buy |
| 7 | CAT | Caterpillar Inc | +0.3% | -0.66% | Trim |
| 8 | MU | Micron Technology Inc | +0.2% | -0.95% | Trim |
| 9 | IWD | Ishares Russell 1000 Value E | +0.2% | +0.89% | Add |
| 10 | CSCO | Cisco Systems Inc | +0.2% | +0.19% | Add |
| 11 | ✓ | +0.2% | NEW | New buy | |
| 12 | GOOG | Alphabet Inc-cl C | +0.1% | +5.98% | Add |
| 13 | ✓ | +0.1% | NEW | New buy | |
| 14 | IWM | Ishares Russell 2000 ETF | +0.1% | +2.76% | Add |
| 15 | AAPL | Apple Inc | +0.1% | +4.00% | Add |
| 16 | SPYM | Ste Str Spdr Pt S&p 500 ETF | +0.1% | +10.93% | Add |
| 17 | GOOGL | Alphabet Inc-cl A | +0.1% | +1.01% | Add |
| 18 | ANET | Arista Networks Inc | +0.1% | +49.43% | Add |
| 19 | IWN | Ishares Russell 2000 Value E | +0.1% | -0.81% | Trim |
| 20 | SPY | Ss Spdr S&p 500 ETF Trust-us | +0.1% | +1.21% | Add |
| 21 | LLY | Eli Lilly & Co | +0.1% | +0.60% | Add |
| 22 | IWP | Ishares Russell Mid-cap Grow | +0.1% | +1.09% | Add |
| 23 | WST | West Pharmaceutical Services | +0.1% | NEW | New buy |
| 24 | CTAS | Cintas CORP | +0.1% | NEW | New buy |
| 25 | DDOG | Datadog Inc - Class A | +0.1% | NEW | New buy |
| 26 | VOO | Vanguard S&p 500 ETF | +0.1% | +5.27% | Add |
| 27 | VEA | Vanguard Ftse Developed ETF | +0.1% | NEW | New buy |
| 28 | MDY | State Street Spdr S&p Midcap | +0.1% | NEW | New buy |
| 29 | MTN | Vail Resorts Inc | +0.1% | NEW | New buy |
| 30 | ✓ | +0.1% | NEW | New buy | |
| 31 | IWB | Ishares Russell 1000 ETF | +0.1% | +2.41% | Add |
| 32 | NVDA | Nvidia CORP | +0.1% | +3.04% | Add |
| 33 | IVW | Ishares S&p 500 Growth ETF | +0.1% | -0.32% | Trim |
| 34 | AVGO | Broadcom Inc | +0.1% | -0.50% | Trim |
| 35 | TXN | Texas Instruments Inc | +0.1% | -2.30% | Trim |
| 36 | GS | Goldman Sachs Group Inc | 0% | +0.53% | Add |
| 37 | VONV | Vanguard Russell 1000 Value | 0% | +1.41% | Add |
| 38 | PANW | Palo Alto Networks Inc | 0% | -25.70% | Trim |
| 39 | AMZN | Amazon.com Inc | 0% | +1.79% | Add |
| 40 | USB | US Bancorp | 0% | +0.71% | Add |
| 41 | BAC | Bank Of America CORP | 0% | +1.05% | Add |
| 42 | GE | General Electric | 0% | +0.58% | Add |
| 43 | TSM | Taiwan Semiconductor-sp Adr | 0% | -8.99% | Trim |
| 44 | ABBV | Abbvie Inc | 0% | -0.68% | Trim |
| 45 | V | Visa Inc-class A Shares | 0% | +0.74% | Add |
| 46 | QQQ | Invesco Qqq Trust Series 1 | 0% | — | Unchanged |
| 47 | SOLV | Solventum CORP | 0% | — | Unchanged |
| 48 | CDNS | Cadence Design Sys Inc | 0% | -1.73% | Trim |
| 49 | MRVL | Marvell Technology Inc | 0% | -56.70% | Trim |
| 50 | IJH | Ishares Core S&p Midcap ETF | — | -2.17% | Trim |
1–50 of 120
Filing History
FAQ
What is Corundum Group, Inc. and what type of investor is it?
Corundum Group, Inc. is an investment manager that files SEC Form 13F quarterly, disclosing its U.S. public equity holdings to regulators. As of the most recent reporting period (2026-06-30), the firm manages a tracked equity portfolio valued at approximately $337.1M, spread across 112 disclosed positions.
What are Corundum Group, Inc.'s largest equity positions?
Based on the latest 13F filing, Corundum Group, Inc.'s top holdings by market value are:
1. Ishares Russell 1000 Growth (IWF) — $42.4M (12.6%)
2. Ishares Russell 1000 Value E (IWD) — $40.5M (12.0%)
3. Ishares Msci Eafe ETF (EFA) — $17.1M (5.1%)
4. 3m Co (MMM) — $16.1M (4.8%)
5. Ishares Russell 2000 Growth (IWO) — $13.7M (4.1%)
What changes did Corundum Group, Inc. make in its most recent portfolio filing?
In the latest reported quarter, Corundum Group, Inc. made 111 notable position adjustments: 12 new positions were initiated, 62 existing holdings were added to, 29 positions were partially reduced, and 8 were completely exited. The largest of these moves: Sold out: Exxon Mobil CORP (XOM); New buy: ; New buy: Boeing Co/the (BA); New buy: Meta Platforms Inc-class A (META); Sold out: Honeywell International Inc (HON)
What sectors does Corundum Group, Inc. focus on?
Corundum Group, Inc. is concentrated in the following sectors based on its current disclosed equity portfolio:
• Industrials: 28.2%
• Information Technology: 25.2%
• Health Care: 11.5%
• Financials: 10.0%
• Communication Services: 7.8%
• Materials: 7.2%
Investment Profile
Corundum Group, Inc. returned an annualized 18.6% over the trailing 36 months — outperforming the S&P 500 by 0.5 points — based on a reconstructed track record of its disclosed 13F positions, with a beta of 0.87 (less volatile than the market) and a 36% quarterly batting average against the index.
Its portfolio is broadly diversified and long-term-holding.
Its turnover score has risen from 0 to 18 over the past 4 quarters — a shift toward more active trading.
It has added to its IWF position over the past two quarters (+$6.4M, now $42.4M), while trimming LMT over the same stretch (-$2.8M, still holding $9.7M).
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Developer Access
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