# 3m (MMM): value investors who own it | moatshark

4 value investors held 3m in their Q3 2026 13F, led by Mairs & Power, Jensen Investment Management, Dodge & Cox, Horizon Kinetics.

## 13F holders

| Manager | Portfolio | Value | Change | Quarters held |
| --- | --- | --- | --- | --- |
| Mairs & Power | 0.5% | $56.6m | Trimmed -0.7% | 53 |
| Jensen Investment Management | 0.1% | $4.5m | Trimmed 0.0% | 53 |
| Dodge & Cox | 0.0% | $1.2m | Trimmed -1.5% | 53 |
| Horizon Kinetics | 0.0% | $437k | Trimmed -46% | 14 |

## Directors buying and selling (Form 4, last 12 months)

| Date | Who | Role | Bought or sold | Shares | Value |
| --- | --- | --- | --- | --- | --- |
| 2026-08-05 | Chavez Rodriguez Beatriz Karina | Group President | Sold | 3635 | $663k |
| 2026-07-23 | Banovetz John Patrick | Executive Vice President | Sold | 7880 | $1.3m |
| 2026-07-23 | Reinseth Theresa E | Sr Vice President & CAO | Sold | 924 | $157k |
| 2026-07-22 | Rhodes Kevin H | EVP, Chief Legal Off & Secret | Sold | 7669 | $1.3m |
| 2026-07-22 | Goralski Christian T JR | Group President | Sold | 4902 | $836k |

Source: SEC filings, via moatshark (https://www.moatshark.com/s/mmm). Values traded and returns are estimates. Not investment advice. Built 2026-10-21.