# Fastenal (FAST): value investors who own it | moatshark

2 value investors held Fastenal in their Q3 2026 13F, led by Cantillon Capital Management, Mairs & Power.

## 13F holders

| Manager | Portfolio | Value | Change | Quarters held |
| --- | --- | --- | --- | --- |
| Cantillon Capital Management | 2.7% | $18.1m | Trimmed -95% | 33 |
| Mairs & Power | 1.7% | $186m | Trimmed -1.3% | 53 |

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

| Date | Who | Role | Bought or sold | Shares | Value |
| --- | --- | --- | --- | --- | --- |
| 2026-08-13 | Papenfuss Donnalee Kathleen | EVP-Strategy and Communication | Sold | 7894 | $406k |
| 2026-08-13 | Papenfuss Donnalee Kathleen | EVP-Strategy and Communication | Sold | 1364 | $70k |
| 2026-08-10 | Ancius Michael J | Director | Sold | 3000 | $156k |
| 2026-08-05 | Heise Rita J. | Director | Sold | 24964 | $1.2m |
| 2026-08-05 | Heise Rita J. | Director | Sold | 10000 | $501k |
| 2026-07-28 | Ancius Michael J | Director | Sold | 3000 | $147k |

## Fund holders

| Fund | Manager | Weight | Value | As at |
| --- | --- | --- | --- | --- |
| Mairs & Power Growth Fund | Mairs & Power | 1.4% | $80.1m | 2026-06-30 |

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