Fastenal Company
MX ˙ BMV ˙ US3119001044
SecurityMX:FAST / Fastenal Company
InstitutionRhumbline Advisers
Latest Disclosed Ownership2,386,667 shares
Latest Disclosed Value $ 110,741,247
Rhumbline Advisers reports 1.26% decrease in ownership of FAST / Fastenal Company

On May 12, 2026 - Rhumbline Advisers filed a 13F-HR form disclosing ownership of 2,386,667 shares of Fastenal Company (MX:FAST) valued at $110,741,247 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 13, 2026 disclosing 2,417,147 shares of Fastenal Company. This represents a change in shares of -1.26% 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.

Upgrade to unlock premium data and export to Excel .

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)
2026-05-12 2026-03-31 13F FASTENAL CO COM COM 311900104 2,386,667 -30,480 -1.26 110,741 14.17 0.0947
2026-02-13 2025-12-31 13F FASTENAL CO COM COM 311900104 2,417,147 -68,516 -2.76 97,000 -20.42 0.0784
2025-11-06 2025-09-30 13F FASTENAL CO COM COM 311900104 2,485,663 -56,609 -2.23 121,897 14.16 0.0979
2025-08-12 2025-06-30 13F FASTENAL CO COM COM 311900104 2,542,272 1,281,967 101.72 106,775 9.25 0.0914
2025-05-29 2025-03-31 13F/A-1 FASTENAL CO COM COM 311900104 1,260,305 35,163 2.87 97,737 10.94 0.0914
2025-04-08 2025-03-31 13F FASTENAL CO COM COM 311900104 1,260,305 35,163 97,737 0.0914
2025-05-29 2024-12-31 13F/A-1 FASTENAL CO COM COM 311900104 1,225,142 -20,992 -1.68 88,100 -1.01 0.0788
2025-01-30 2024-12-31 13F FASTENAL CO COM COM 311900104 1,225,142 -20,992 88,100 0.0788
2024-11-12 2024-09-30 13F FASTENAL CO COM COM 311900104 1,246,134 -104,501 -7.74 88,999 4.86 0.0803
2024-08-01 2024-06-30 13F FASTENAL CO COM COM 311900104 1,350,635 483 0.04 84,874 -18.51 0.0798
2024-05-09 2024-03-31 13F FASTENAL CO COM COM 311900104 1,350,152 137,570 11.35 104,151 32.61 0.1000
2024-02-08 2023-12-31 13F FASTENAL CO COM COM 311900104 1,212,582 18,190 1.52 78,539 20.34 0.0823
2023-11-09 2023-09-30 13F FASTENAL CO COM COM 311900104 1,194,392 -17,654 -1.46 65,261 -8.72 0.0758
2023-08-08 2023-06-30 13F FASTENAL CO COM COM 311900104 1,212,046 -14,901 -1.21 71,499 108,230.30 0.0801
2023-05-11 2023-03-31 13F FASTENAL CO COM COM 311900104 1,226,947 91,402 8.05 66 -99.88 0.0817
2023-02-14 2022-12-31 13F FASTENAL CO COM COM 311900104 1,135,545 17,355 1.55 53,734 4.38 0.0722
2022-11-10 2022-09-30 13F FASTENAL CO COM COM 311900104 1,118,190 10,628 0.96 51,481 -6.89 0.0767
2022-08-11 2022-06-30 13F FASTENAL CO COM COM 311900104 1,107,562 94,418 9.32 55,289 -8.13 0.0807
2022-05-12 2022-03-31 13F FASTENAL CO COM COM 311900104 1,013,144 -25,768 -2.48 60,181 -9.57 0.0775
2022-02-10 2021-12-31 13F FASTENAL CO COM COM 311900104 1,038,912 40,157 4.02 66,553 29.11 0.0816
2021-11-12 2021-09-30 13F FASTENAL CO COM COM 311900104 998,755 -24,960 -2.44 51,546 -3.17 0.0698
2021-08-05 2021-06-30 13F FASTENAL CO COM COM 311900104 1,023,715 -37,689 -3.55 53,233 -0.25 0.0699
2021-05-06 2021-03-31 13F FASTENAL CO COM COM 311900104 1,061,404 -25,845 -2.38 53,367 0.52 0.0725
2021-02-10 2020-12-31 13F FASTENAL CO COM COM 311900104 1,087,249 -114,064 -9.49 53,090 -1.99 0.0733
2020-11-12 2020-09-30 13F FASTENAL CO COM COM 311900104 1,201,313 -33,815 -2.74 54,167 2.37 0.0849
2020-08-13 2020-06-30 13F FASTENAL CO COM COM 311900104 1,235,128 90,764 7.93 52,913 47.96 0.0884
2020-05-06 2020-03-31 13F FASTENAL CO COM COM 311900104 1,144,364 -33,799 -2.87 35,761 -17.85 0.0749
2020-02-05 2019-12-31 13F FASTENAL CO COM COM 311900104 1,178,163 -50,068 -4.08 43,533 8.49 0.0728
2019-10-23 2019-09-30 13F FASTENAL CO COM COM 311900104 1,228,231 -1,479 -0.12 40,126 0.12 0.0733
2019-08-14 2019-06-30 13F FASTENAL CO COM COM 311900104 1,229,710 657,781 115.01 40,076 8.96 0.0752
2019-05-01 2019-03-31 13F FASTENAL CO COM COM 311900104 571,929 -7,615 -1.31 36,781 21.37 0.0712
2019-01-31 2018-12-31 13F FASTENAL CO COM COM 311900104 579,544 -12,487 -2.11 30,304 -11.78 0.0659
2018-11-07 2018-09-30 13F FASTENAL CO COM COM 311900104 592,031 -22,784 -3.71 34,350 16.08 0.0663
2018-08-06 2018-06-30 13F FASTENAL CO COM COM 311900104 614,815 14,858 2.48 29,591 -9.65 0.0597
2018-05-02 2018-03-31 13F FASTENAL CO COM COM 311900104 599,957 -16,679 -2.70 32,752 -2.88 0.0684
2018-02-09 2017-12-31 13F FASTENAL CO COM COM 311900104 616,636 195 0.03 33,724 20.03 0.0685
2017-11-06 2017-09-30 13F FASTENAL CO COM COM 311900104 616,441 -2,180 -0.35 28,097 4.34 0.0611
2017-08-02 2017-06-30 13F FASTENAL CO COM COM 311900104 618,621 6,696 1.09 26,929 -14.55 0.0615
2017-05-02 2017-03-31 13F FASTENAL CO COM COM 311900104 611,925 -2,181 -0.36 31,514 9.23 0.0736
2017-01-27 2016-12-31 13F FASTENAL CO COM COM 311900104 614,106 43,460 7.62 28,851 21.01 0.0731
2016-11-08 2016-09-30 13F FASTENAL CO COM COM 311900104 570,646 15,551 2.80 23,842 -3.24 0.0657
2016-08-11 2016-06-30 13F FASTENAL CO COM COM 311900104 555,095 6,330 1.15 24,641 -8.36 0.0730
2016-05-02 2016-03-31 13F FASTENAL CO USD.0 COM 311900104 548,765 7,416 1.37 26,889 21.68 0.0834
2016-02-03 2015-12-31 13F FASTENAL CO USD.0 COM 311900104 541,349 15,667 2.98 22,098 14.82 0.0711
2015-11-04 2015-09-30 13F FASTENAL CO USD.0 COM 311900104 525,682 20,961 4.15 19,245 -9.60 0.0655
2015-08-04 2015-06-30 13F FASTENAL CO USD.0 COM 311900104 504,721 36,846 7.88 21,289 9.82 0.0679
2015-05-12 2015-03-31 13F FASTENAL CO USD.0 COM 311900104 467,875 6,550 1.42 19,386 -11.64 0.0559
2015-02-06 2014-12-31 13F FASTENAL CO USD.0 COM 311900104 461,325 -2,920 -0.63 21,941 5.26 0.0637
2014-11-12 2014-09-30 13F FASTENAL CO USD.0 COM 311900104 464,245 -101,267 -17.91 20,845 -25.52 0.0626
2014-08-06 2014-06-30 13F FASTENAL CO USD.0 COM 311900104 565,512 -16,156 -2.78 27,987 -2.44 0.0821
2014-05-06 2014-03-31 13F FASTENAL CO USD.0 COM 311900104 581,668 23,373 4.19 28,688 8.15 0.0851
2014-02-03 2013-12-31 13F FASTENAL CO USD.0 COM 311900104 558,295 -39,733 -6.64 26,525 -11.73 0.0782
2013-11-05 2013-09-30 13F FASTENAL CO USD.0 COM 311900104 598,028 1,508 0.25 30,051 9.88 0.0931
2013-08-07 2013-06-30 13F FASTENAL CO USD.0 COM 311900104 596,520 596,520 27,350 0.0879
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.