Fastenal's third-quarter results showed that its strategy of embedding inventory systems with large customers can lift sales and operating profit even when product mix pressures gross margin. Revenue rose 15.5% year over year to $2.46 billion, while diluted earnings per share reached $0.35.
Operating income increased 20.2% to $530.8 million, and operating margin improved to 21.5% from 20.7%. That leverage matters because gross margin moved in the opposite direction, falling to 44.8% from 45.3%. Fastenal attributed the decline partly to a larger share of sales from bigger customers, which typically negotiate lower product margins.
The results illustrate the model's trade-off. Larger national accounts can dilute gross margin, but they also support more stable volume and better use of distribution and labor. Manufacturing daily sales grew 17.2%, while nonresidential construction increased 12.0%. Product pricing contributed about 240 basis points to total sales growth, so volume and customer gains, not price alone, carried most of the increase.
Fastenal also raised the investment question. It expects 2026 capital spending net of asset-sale proceeds to reach $310 million to $330 million, up from $230.6 million in 2025. Projects include replacing the Atlanta hub, expanding distribution capacity, completing delayed IT work and spending more on trucking.
The company signed 7,484 weighted FASTBin and FASTVend devices during the quarter and maintained its 2026 target of 27,000 to 29,000 monthly-equivalent unit signings. Those systems deepen customer relationships, but the higher capital plan must translate into productivity and cash generation.
Investors should now watch whether operating leverage can continue while gross margin remains under pressure. If distribution investments raise throughput and embedded-device growth sustains customer retention, the lower product margin may be an acceptable cost of faster, more durable sales.