Fastenal Company
MX ˙ BMV ˙ US3119001044
SecurityMX:FAST / Fastenal Company
InstitutionGrandfield & Dodd, Llc
Latest Disclosed Ownership52,228 shares
Latest Disclosed Value $ 2,423,379
Grandfield & Dodd, Llc ownership in FAST / Fastenal Company

On May 7, 2026 - Grandfield & Dodd, Llc filed a 13F-HR form disclosing ownership of 52,228 shares of Fastenal Company (MX:FAST) valued at $2,423,379 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 10, 2026 disclosing 52,228 shares of Fastenal Company. This represents a change in shares of 0.00% during the quarter.

Institutional Ownership: 13F and NPORT Filings

The Security and Class in the table below are shown exactly as filed by the investor. We do our best to track continuity of investments through acquisitions, and this will be reflected in the table as changes in names. In addition to descriptive data, performance of the investment is shown over time. To calculate quarterly performance, we first calculate cost basis of the shares purchased during the quarter, then use that to calculate gross profit. Quarterly return is Gross Profit / Starting Portfolio value.

Note that cost basis is calculated and stored in thousands, so small quarterly changes in shares frequently result in a cost basis of zero.

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Disclosed Equity Positions (from 13F/NPORT Filings)
File
Date		 Effective
Date		Form Security Class ID Avg Price
Paid (Est)		 Reported
Shares		 ΔShares ΔShares
(%)		 Reported
Value
(x1000)		 ΔValue
(%)		 Alloc
(%)		 ΔAlloc ΔAlloc (%) Cost Basis
(x1000)		 Unrealized
Gain/Loss
(x1000)
2026-05-07 2026-03-31 13F FASTENAL COM 311900104 52,228 0 0.00 2,423 15.66 0.1368
2026-02-10 2025-12-31 13F FASTENAL COM 311900104 52,228 0 0.00 2,096 -18.20 0.1187
2025-10-30 2025-09-30 13F FASTENAL COM 311900104 52,228 -872 -1.64 2,561 14.84 0.1453
2025-08-08 2025-06-30 13F FASTENAL COM 311900104 53,100 26,550 100.00 2,230 8.36 0.1306
2025-05-02 2025-03-31 13F FASTENAL COM 311900104 26,550 0 0.00 2,059 7.81 0.1277
2025-02-06 2024-12-31 13F FASTENAL COM 311900104 26,550 0 0.00 1,909 0.69 0.1177
2024-11-08 2024-09-30 13F FASTENAL COM 311900104 26,550 0 0.00 1,896 13.67 0.1124
2024-08-09 2024-06-30 13F FASTENAL COM 311900104 26,550 0 0.00 1,668 -18.55 0.1056
2024-05-06 2024-03-31 13F FASTENAL COM 311900104 26,550 -300 -1.12 2,048 17.77 0.1292
2024-01-31 2023-12-31 13F FASTENAL COM 311900104 26,850 0 0.00 1,739 18.54 0.1202
2023-10-26 2023-09-30 13F FASTENAL COM 311900104 26,850 0 0.00 1,467 -7.33 0.1078
2023-08-08 2023-06-30 13F FASTENAL COM 311900104 26,850 -310 -1.14 1,584 8.05 0.1107
2023-04-28 2023-03-31 13F FASTENAL COM 311900104 27,160 800 3.03 1,465 17.48 0.1024
2023-01-20 2022-12-31 13F FASTENAL COM 311900104 26,360 -2,086 -7.33 1,247 -4.81 0.0913
2022-11-04 2022-09-30 13F FASTENAL COM 311900104 28,446 0 0.00 1,310 -7.75 0.1070
2022-08-01 2022-06-30 13F FASTENAL COM 311900104 28,446 0 0.00 1,420 -15.98 0.1118
2022-04-19 2022-03-31 13F FASTENAL COM 311900104 28,446 0 0.00 1,690 -7.14 0.1147
2022-02-08 2021-12-31 13F FASTENAL COM 311900104 28,446 -1,410 -4.72 1,820 18.18 0.1171
2021-10-28 2021-09-30 13F FASTENAL COM 311900104 29,856 0 0.00 1,540 -0.65 0.1075
2021-07-28 2021-06-30 13F FASTENAL COM 311900104 29,856 0 0.00 1,550 3.33 0.1073
2021-04-22 2021-03-31 13F FASTENAL COM 311900104 29,856 0 0.00 1,500 2.74 0.1121
2021-01-29 2020-12-31 13F FASTENAL COM 311900104 29,856 0 0.00 1,460 8.15 0.1146
2020-11-03 2020-09-30 13F FASTENAL COM 311900104 29,856 0 0.00 1,350 5.47 0.1216
2020-07-24 2020-06-30 13F FASTENAL COM 311900104 29,856 286 0.97 1,280 38.53 0.1238
2020-05-14 2020-03-31 13F FASTENAL COM 311900104 29,570 0 0.00 924 -15.46 0.1089
2020-02-07 2019-12-31 13F FASTENAL COM 311900104 29,570 0 0.00 1,093 13.15 0.0996
2019-10-30 2019-09-30 13F FASTENAL COM 311900104 29,570 0 0.00 966 0.21 0.0950
2019-07-29 2019-06-30 13F FASTENAL COM 311900104 29,570 14,785 100.00 964 1.37 0.0953
2019-04-26 2019-03-31 13F FASTENAL COM 311900104 14,785 0 0.00 951 23.03 0.0990
2019-02-12 2018-12-31 13F FASTENAL COM 311900104 14,785 -700 -4.52 773 -13.92 0.0915
2018-11-02 2018-09-30 13F FASTENAL COM 311900104 15,485 -150 -0.96 898 19.26 0.0925
2018-07-27 2018-06-30 13F FASTENAL COM 311900104 15,635 0 0.00 753 -11.83 0.0827
2018-05-04 2018-03-31 13F/A-1 FASTENAL COM 311900104 15,635 0 0.00 854 -0.12 0.0953
2018-05-04 2018-03-31 13F FASTENAL COM 311900104 15,635 0 854
2018-02-05 2017-12-31 13F FASTENAL COM 311900104 15,635 0 0.00 855 19.92 0.0913
2017-11-03 2017-09-30 13F FASTENAL COM 311900104 15,635 0 0.00 713 4.70 0.0800
2017-07-27 2017-06-30 13F FASTENAL COM 311900104 15,635 2,064 15.21 681 -2.58 0.0805
2017-04-28 2017-03-31 13F FASTENAL COM 311900104 13,571 0 0.00 699 9.56 0.0863
2017-02-02 2016-12-31 13F FASTENAL COM 311900104 13,571 0 0.00 638 12.52 0.0827
2016-10-24 2016-09-30 13F FASTENAL COM 311900104 13,571 13,571 0.00 567 0.0745
2015-11-02 2015-09-30 13F FASTENAL COM 311900104 0 0 0 0.0000
2015-08-03 2015-06-30 13F FASTENAL COM 311900104 0 -9,982 -100.00 0 -100.00
2015-05-15 2015-03-31 13F FASTENAL COM 311900104 9,982 0 0.00 414 -12.84 0.0633
2015-02-05 2014-12-31 13F FASTENAL COM 311900104 9,982 -52 -0.52 475 5.32 0.0734
2014-11-10 2014-09-30 13F FASTENAL COM 311900104 10,034 52 0.52 451 -8.70 0.0709
2014-08-14 2014-06-30 13F FASTENAL COM 311900104 9,982 -3,000 -23.11 494 -22.81 0.0745
2014-05-06 2014-03-31 13F FASTENAL COM 311900104 12,982 0 0.00 640 3.73 0.1005
2014-02-06 2013-12-31 13F FASTENAL COM 311900104 12,982 -7,000 -35.03 617 -38.55 0.1002
2013-11-04 2013-09-30 13F FASTENAL COM 311900104 19,982 0 0.00 1,004 9.73 0.1790
2013-08-01 2013-06-30 13F FASTENAL COM 311900104 19,982 19,982 915 0.1733
Legend
Shares
The total number of shares held by the institution at the end of the reporting period (the effective date). This is provided in the filing.
Value
The total value of the shares as of the effective date. This is provided in the filing.
Avg. Share Price
The weighted average share price of the shares held by the institution. We use FIFO accounting to determine this price
Class
This is the security class as indicated by the filer. There are a variety of values for this field. Common values include "EC" = equity common, "EP" - equity preferred
Allocation (%)
The percent of the institution's portfolio that this position represents. This is provided in NPORT filings. For 13F filings, we calculate it.
Change in Allocation
The change in allocation from the prior reporting period. This is calculated as current allocation - prior allocation.
Change in Allocation (%)
The percent change in allocation from the prior reporting period. This is calculated as (current allocation - prior allocation) / prior allocation.
Cost Basis
The total cost of the shares held. This is calculated as reported shares * avg. share price
Unrealized Gain/Loss
This is the market value of the position as of the effective date minus the cost basis.