Largest positions
| Issuer | Class | Value | Share |
|---|---|---|---|
| Apple Inc.COM | COM | $22.1M | 2.6% |
| WW Grainger Inc.COM | COM | $16.1M | 1.9% |
| Microsoft Corp.COM | COM | $15.3M | 1.8% |
| Unitedhealth Group Inc.COM | COM | $14.6M | 1.7% |
| Costco Wholesale CorporationCOM | COM | $13.4M | 1.6% |
| Broadcom Inc.COM | COM | $13.3M | 1.6% |
| Cencora Inc.COM | COM | $13.3M | 1.5% |
| Aflac Inc.COM | COM | $12.9M | 1.5% |
| Cisco Sys Inc.COM | COM | $12.5M | 1.5% |
| Linde PLCSHS | SHS | $12.3M | 1.4% |
| Chubb LimitedCOM | COM | $12.3M | 1.4% |
| Eli Lilly & COCOM | COM | $12.2M | 1.4% |
| WEC Energy Group Inc.COM | COM | $12.1M | 1.4% |
| Lowes Cos Inc.COM | COM | $12.1M | 1.4% |
| General Dynamics Corp.COM | COM | $11.9M | 1.4% |
| Texas Instrs Inc.COM | COM | $11.8M | 1.4% |
| Nextera Energy Inc.COM | COM | $11.6M | 1.3% |
| Cms Energy Corp.COM | COM | $11.5M | 1.3% |
| Automatic Data Processing INCOM | COM | $11.2M | 1.3% |
| American Wtr Wks CO Inc. NewCOM | COM | $11.2M | 1.3% |
| Trane Technologies PLCSHS | SHS | $11.1M | 1.3% |
| Amphenol Corp.CL A | CL A | $11M | 1.3% |
| Brown & Brown Inc.COM | COM | $10.9M | 1.3% |
| Sherwin Williams COCOM | COM | $10.8M | 1.3% |
| Factset Resh Sys Inc.COM | COM | $10.8M | 1.3% |
| L3harris Technologies Inc.COM | COM | $10.6M | 1.2% |
| Home Depot Inc.COM | COM | $10.6M | 1.2% |
| Walmart Inc.COM | COM | $10.6M | 1.2% |
| Paychex Inc.COM | COM | $10.6M | 1.2% |
| Analog Devices Inc.COM | COM | $10.5M | 1.2% |
| JPMORGAN Chase & COCOM | COM | $10.4M | 1.2% |
| Ecolab Inc.COM | COM | $10.3M | 1.2% |
| Motorola Solutions Inc.COM NEW | COM NEW | $10.3M | 1.2% |
| Atmos Energy Corp.COM | COM | $10.2M | 1.2% |
| Blackrock Inc.COM | COM | $10.2M | 1.2% |
| Amgen Inc.COM | COM | $10.1M | 1.2% |
| Johnson & JohnsonCOM | COM | $10.1M | 1.2% |
| Visa Inc.COM CL A | COM CL A | $10.1M | 1.2% |
| Parker-hannifin Corp.COM | COM | $9.92M | 1.2% |
| Abbott LaboratoriesCOM | COM | $9.89M | 1.2% |
| Illinois Tool Wks Inc.COM | COM | $9.88M | 1.2% |
| Xylem Inc.COM | COM | $9.86M | 1.2% |
| Waste Mgmt Inc. DelCOM | COM | $9.84M | 1.1% |
| S&P Global Inc.COM | COM | $9.83M | 1.1% |
| Roper Technologies Inc.COM | COM | $9.82M | 1.1% |
| New Jersey Res Corp.COM | COM | $9.79M | 1.1% |
| Stryker CorporationCOM | COM | $9.78M | 1.1% |
| Prologis Inc..COM | COM | $9.67M | 1.1% |
| Colgate Palmolive COCOM | COM | $9.58M | 1.1% |
| Cintas Corp.COM | COM | $9.51M | 1.1% |
- Class
- COM
- Share
- 2.6%
- Class
- COM
- Share
- 1.9%
- Class
- COM
- Share
- 1.8%
- Class
- COM
- Share
- 1.7%
- Class
- COM
- Share
- 1.6%
- Class
- COM
- Share
- 1.6%
- Class
- COM
- Share
- 1.5%
- Class
- COM
- Share
- 1.5%
- Class
- COM
- Share
- 1.5%
- Class
- SHS
- Share
- 1.4%
- Class
- COM
- Share
- 1.4%
- Class
- COM
- Share
- 1.4%
- Class
- COM
- Share
- 1.4%
- Class
- COM
- Share
- 1.4%
- Class
- COM
- Share
- 1.4%
- Class
- COM
- Share
- 1.4%
- Class
- COM
- Share
- 1.3%
- Class
- COM
- Share
- 1.3%
- Class
- COM
- Share
- 1.3%
- Class
- COM
- Share
- 1.3%
- Class
- SHS
- Share
- 1.3%
- Class
- CL A
- Share
- 1.3%
- Class
- COM
- Share
- 1.3%
- Class
- COM
- Share
- 1.3%
- Class
- COM
- Share
- 1.3%
- Class
- COM
- Share
- 1.2%
- Class
- COM
- Share
- 1.2%
- Class
- COM
- Share
- 1.2%
- Class
- COM
- Share
- 1.2%
- Class
- COM
- Share
- 1.2%
- Class
- COM
- Share
- 1.2%
- Class
- COM
- Share
- 1.2%
- Class
- COM NEW
- Share
- 1.2%
- Class
- COM
- Share
- 1.2%
- Class
- COM
- Share
- 1.2%
- Class
- COM
- Share
- 1.2%
- Class
- COM
- Share
- 1.2%
- Class
- COM CL A
- Share
- 1.2%
- Class
- COM
- Share
- 1.2%
- Class
- COM
- Share
- 1.2%
- Class
- COM
- Share
- 1.2%
- Class
- COM
- Share
- 1.2%
- Class
- COM
- Share
- 1.1%
- Class
- COM
- Share
- 1.1%
- Class
- COM
- Share
- 1.1%
- Class
- COM
- Share
- 1.1%
- Class
- COM
- Share
- 1.1%
- Class
- COM
- Share
- 1.1%
- Class
- COM
- Share
- 1.1%
- Class
- COM
- Share
- 1.1%
The share class is shown on a wider screen.
The 50 largest of 166 positions by value, with holdings of the same security combined. The 166 largest are in this firm's machine-readable record. Share counts and quarter-on-quarter changes for each position are on EDGAR. View the full information table on EDGAR
This filing
- Form
- 13F-HR
- CIK
- 1803227
- File number
- 028-19975
- Options
- 0 call, 0 put
- In the 25 largest
- 37.2%
- Prior quarter
- $835M at 31 March 2026
- Positions opened
- 3
- Positions closed
- 7
Common questions
What are Mattern Capital Management’s 13F holdings worth?
$857 million across 166 positions for the quarter ended 30 June 2026.
What is Mattern Capital Management’s largest 13F holding?
APPLE INC (COM) was the largest position at $22.1 million, or 2.6% of reported 13F value, as of 30 June 2026.
How concentrated is Mattern Capital Management’s 13F portfolio?
The ten largest positions accounted for 17.0% of reported value and the twenty-five largest for 37.2%, across 166 positions as of 30 June 2026.
Does Form 13F show everything Mattern Capital Management manages?
No. Form 13F covers only long positions in exchange-traded securities over which the manager has investment discretion, valued at quarter end. It excludes cash, most bonds, private funds, and any assets the firm does not have discretion over, so it is neither the firm's total assets nor any individual client's portfolio.
How often does Mattern Capital Management file its 13F?
Every quarter. Managers file within 45 days of each quarter's end, so the figures are a snapshot that changes between filings. This page shows the quarter ended 30 June 2026.
Answered from this filing and the prior quarter's.