SiteOne Landscape Supply, Inc.
MX ˙ BMV ˙ US82982L1035
SecurityMX:SITE / SiteOne Landscape Supply, Inc.
InstitutionJanus Henderson Group Plc
Latest Disclosed Ownership410,854 shares
Latest Disclosed Value $ 54,684,973
Janus Henderson Group Plc reports 3.64% increase in ownership of SITE / SiteOne Landscape Supply, Inc.

On May 18, 2026 - Janus Henderson Group Plc filed a 13F-HR/A form disclosing ownership of 410,854 shares of SiteOne Landscape Supply, Inc. (MX:SITE) valued at $54,684,973 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 17, 2026 disclosing 396,440 shares of SiteOne Landscape Supply, Inc.. This represents a change in shares of 3.64% 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)
2026-05-18 2026-03-31 13F/A-1 SITEONE LANDSCAPE SUPPLY COM 82982L103 410,854 14,414 3.64 54,685 10.74 0.0261
2026-05-15 2026-03-31 13F SITEONE LANDSCAPE SUPPLY COM 82982L103 410,854 14,414 54,685 0.0101
2026-02-17 2025-12-31 13F SITEONE LANDSCAPE SUPPLY COM 82982L103 396,440 -14,081 -3.43 49,381 -6.61 0.0221
2025-11-14 2025-09-30 13F SITEONE LANDSCAPE SUPPLY COM 82982L103 410,521 392,152 2,134.86 52,876 2,281.76 0.0241
2025-08-14 2025-06-30 13F SITEONE LANDSCAPE SUPPLY COM 82982L103 18,369 -37,462 -67.10 2,221 -67.35 0.0011
2025-05-15 2025-03-31 13F SITEONE LANDSCAPE SUPPLY COM 82982L103 55,831 3,668 7.03 6,799 -1.00 0.0037
2025-02-14 2024-12-31 13F SITEONE LANDSCAPE SUPPLY COM 82982L103 52,163 2,379 4.78 6,868 -8.57 0.0035
2024-11-14 2024-09-30 13F SITEONE LANDSCAPE SUPPLY COM 82982L103 49,784 13,314 36.51 7,512 69.69 0.0038
2024-08-14 2024-06-30 13F SITEONE LANDSCAPE SUPPLY COM 82982L103 36,470 697 1.95 4,428 -29.09 0.0024
2024-05-15 2024-03-31 13F SITEONE LANDSCAPE SUPPLY COM 82982L103 35,773 -381 -1.05 6,243 6.25 0.0034
2024-02-14 2023-12-31 13F SITEONE LANDSCAPE SUPPLY COM 82982L103 36,154 902 2.56 5,877 1.96 0.0035
2023-11-14 2023-09-30 13F SITEONE LANDSCAPE SUPPLY COM 82982L103 35,252 3,171 9.88 5,764 7.34 0.0038
2023-08-14 2023-06-30 13F SITEONE LANDSCAPE SUPPLY COM 82982L103 32,081 6,007 23.04 5,369 50.56 0.0033
2023-05-15 2023-03-31 13F SITEONE LANDSCAPE SUPPLY COM 82982L103 26,074 11,095 74.07 3,566 102.96 0.0024
2023-02-14 2022-12-31 13F SITEONE LANDSCAPE SUPPLY COM 82982L103 14,979 -98 -0.65 1,757 11.91 0.0013
2023-01-13 2022-09-30 13F/A-1 SITEONE LANDSCAPE SUPPLY COM 82982L103 15,077 27 0.18 1,570 -12.29 0.0012
2022-11-14 2022-09-30 13F SITEONE LANDSCAPE SUPPLY COM 82982L103 15,077 27 1,570 0.0004
2022-08-15 2022-06-30 13F SITEONE LANDSCAPE SUPPLY COM 82982L103 15,050 665 4.62 1,790 -23.01 0.0012
2022-05-16 2022-03-31 13F SITEONE LANDSCAPE SUPPLY COM 82982L103 14,385 -1,199 -7.69 2,325 -38.44 0.0011
2022-02-14 2021-12-31 13F SITEONE LANDSCAPE SUPPLY COM 82982L103 15,584 4,125 36.00 3,777 65.22 0.0016
2021-11-16 2021-09-30 13F SITEONE LANDSCAPE SUPPLY COM 82982L103 11,459 3,205 38.83 2,286 63.64 0.0010
2021-08-16 2021-06-30 13F SITEONE LANDSCAPE SUPPLY COM 82982L103 8,254 2,099 34.10 1,397 32.92 0.0006
2021-05-17 2021-03-31 13F SITEONE LANDSCAPE SUPPLY COM 82982L103 6,155 717 13.18 1,051 21.78 0.0005
2021-02-16 2020-12-31 13F SITEONE LANDSCAPE SUPPLY COM 82982L103 5,438 484 9.77 863 42.88 0.0004
2020-11-16 2020-09-30 13F SITEONE LANDSCAPE SUPPLY COM 82982L103 4,954 -1,793 -26.57 604 -21.46 0.0003
2020-08-14 2020-06-30 13F SITEONE LANDSCAPE SUPPLY COM 82982L103 6,747 -5,934 -46.79 769 -17.67 0.0004
2020-05-14 2020-03-31 13F SITEONE LANDSCAPE SUPPLY COM 82982L103 12,681 -331,312 -96.31 934 -97.00 0.0006
2020-02-18 2019-12-31 13F SITEONE LANDSCAPE SUPPLY COM 82982L103 343,993 -3,101 -0.89 31,183 21.37 0.0160
2019-11-14 2019-09-30 13F SITEONE LANDSCAPE SUPPLY COM 82982L103 347,094 66,095 23.52 25,692 31.94 0.0139
2019-07-31 2019-06-30 13F SITEONE LANDSCAPE SUPPLY COM 82982L103 280,999 -3,477 -1.22 19,473 19.77 0.0106
2019-04-30 2019-03-31 13F SITEONE LANDSCAPE SUPPLY COM 82982L103 284,476 3,432 1.22 16,258 4.67 0.0090
2019-02-06 2018-12-31 13F SITEONE LANDSCAPE SUPPLY COM 82982L103 281,044 -8,575 -2.96 15,533 -28.81 0.0099
2018-11-09 2018-09-30 13F SITEONE LANDSCAPE SUPPLY COM 82982L103 289,619 180,658 165.80 21,820 138.50 0.0117
2018-08-10 2018-06-30 13F SITEONE LANDSCAPE SUPPLY COM 82982L103 108,961 106,370 4,105.36 9,149 4,474.50 0.0052
2018-05-14 2018-03-31 13F SITEONE LANDSCAPE SUPPLY COM 82982L103 2,591 2,591 200 0.0001
2017-11-14 2017-09-30 13F SITEONE LANDSCAPE SUPPLY COM 82982L103 0 -225,852 -100.00 0 -100.00
2017-08-17 2017-06-30 13F/A-1 SITEONE LANDSCAPE SUPPLY COM 82982L103 225,852 225,852 11,758 0.0080
2017-08-14 2017-06-30 13F SITEONE LANDSCAPE SUPPLY COM 82982L103 225,852 11,758 0.0080
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.