Investigate / reported ownership
FAST
Fastenal CO
3 tracked reported owners · snapshot updated 2026-10-04. Delayed disclosures, not live holdings or an investment recommendation.
Who reports owning FAST?
Select a manager to inspect their portfolio. Reports may cover different quarters; portfolio weights describe disclosed long 13F holdings, not total economic exposure.
| #↑ | Manager | % Port. | History | Value | Shares |
|---|---|---|---|---|---|
| 1 | Mairs & Power Funds | 1.7% | 40q | $186M | 3,870,891 |
| 2 | Joel Greenblatt | 0.1% | 38q | $95M | 1,973,383 |
| 3 | William Von Mueffling | 2.7% | 33q | $18M | 376,044 |
Go beyond ownership.
Fastenal sells industrial and construction supplies through a global network using vending, bin-stock and eBusiness technologies, primarily in business-to-business transactions. Its managed-inventory, integrated-supply and eBusiness service models are designed to improve product availability, replenishment and procurement costs.
Question to investigate: Can Fastenal's customer-site service models keep winning business amid tariff, trade-policy and macroeconomic uncertainty?
Company research reviewed 2026-10-02; a dated source-linked starting point, not the investors’ stated reasons.
Understand the business and investment case →Filing dates and original SEC sources
Reported position changes
Net disclosed share changes—not individual trades or execution dates. NEW has no prior-position percentage comparison; EXIT weight refers to the previous report.
| Manager | Move | % Port. | Δ Shares | Value | Filed |
|---|---|---|---|---|---|
| William Von Mueffling | TRIM | 2.7% | -95% | $18M | Jul 29, 2026 |
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Long US 13F disclosures omit shorts and can be amended. CUSIP 311900104. No current price, valuation or manager motive is inferred.