The following tables present the level within the fair value hierarchy at which the investments are measured on a recurring basis as of December 31, 2025 and 2024:


	Fair value at December 31, 2025
	Level 1		Level 2	Level 3	Total
Mutual funds	$	458,459,578	—	—	458,459,578
Fastenal Company common stock	316,565,240		—	—	316,565,240
Stable value fund	—		22,812,882	—	22,812,882
Common/collective trust funds	—		408,762,271	—	408,762,271
Total investments at fair value	$	775,024,818	431,575,153	—	1,206,599,971


	Fair value at December 31, 2024
	Level 1		Level 2	Level 3	Total
Mutual funds	$	403,598,461	—	—	403,598,461
Fastenal Company common stock	285,153,120		—	—	285,153,120
Stable value fund	—		22,628,532	—	22,628,532
Common/collective trust funds	—		327,713,114	—	327,713,114
Total investments at fair value	$	688,751,581	350,341,646	—	1,039,093,227

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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+ Details

- Definition

Tabular disclosure of fair value of investment held by employee stock purchase, saving, or similar plan (employee benefit plan (EBP)), including, but not limited to, fair value measured at net asset value per share as practical expedient (NAV).

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+ Details