SiteOne Landscape Supply, Inc.
US ˙ NYSE ˙ US82982L1035

SecuritySITE / SiteOne Landscape Supply, Inc.
InstitutionBrown Advisory Inc
Latest Disclosed Ownership352,669 shares
Latest Disclosed Value $ 46,943,765
Brown Advisory Inc reports 11.92% decrease in ownership of SITE / SiteOne Landscape Supply, Inc.

On May 15, 2026 - Brown Advisory Inc filed a 13F-HR form disclosing ownership of 352,669 shares of SiteOne Landscape Supply, Inc. (US:SITE) valued at $46,943,771 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 13, 2026 disclosing 400,403 shares of SiteOne Landscape Supply, Inc.. This represents a change in shares of -11.92% during the quarter. The current value of the position is $36,272,007 USD.

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)
2026-05-15 2026-03-31 13F SITEONE LANDSCAPE SUPPLY COM 82982L103 352,669 -47,734 -11.92 46,944 -5.88 0.0344
2026-02-13 2025-12-31 13F SITEONE LANDSCAPE SUPPLY COM 82982L103 400,403 -81,462 -16.91 49,874 -19.64 0.0696
2025-11-14 2025-09-30 13F SITEONE LANDSCAPE SUPPLY COM 82982L103 481,865 -17,952 -3.59 62,064 2.68 0.0808
2025-08-13 2025-06-30 13F SITEONE LANDSCAPE SUPPLY COM 82982L103 499,817 -17,004 -3.29 60,448 -3.69 0.0796
2025-04-30 2025-03-31 13F SITEONE LANDSCAPE SUPPLY COM 82982L103 516,821 4,179 0.82 62,763 -7.09 0.0897
2025-02-14 2024-12-31 13F SITEONE LANDSCAPE SUPPLY COM 82982L103 512,642 58,736 12.94 67,551 -1.38 0.0857
2024-11-13 2024-09-30 13F SITEONE LANDSCAPE SUPPLY COM 82982L103 453,906 -7,907 -1.71 68,499 22.17 0.0860
2024-08-14 2024-06-30 13F SITEONE LANDSCAPE SUPPLY COM 82982L103 461,813 102,683 28.59 56,069 -10.56 0.0733
2024-04-24 2024-03-31 13F SITEONE LANDSCAPE SUPPLY COM 82982L103 359,130 6,115 1.73 62,686 9.28 0.0838
2024-02-08 2023-12-31 13F SITEONE LANDSCAPE SUPPLY COM 82982L103 353,015 97,305 38.05 57,365 37.25 0.0806
2023-10-25 2023-09-30 13F SITEONE LANDSCAPE SUPPLY COM 82982L103 255,710 9,240 3.75 41,796 1.32 0.0686
2023-07-31 2023-06-30 13F SITEONE LANDSCAPE SUPPLY COM 82982L103 246,470 15,093 6.52 41,249 30.25 0.0644
2023-05-08 2023-03-31 13F SITEONE LANDSCAPE SUPPLY COM 82982L103 231,377 3,276 1.44 31,669 18.34 0.0536
2023-02-13 2022-12-31 13F SITEONE LANDSCAPE SUPPLY COM 82982L103 228,101 -4,693 -2.02 26,761 10.38 0.0497
2022-11-14 2022-09-30 13F SITEONE LANDSCAPE SUPPLY COM 82982L103 232,794 -20,375 -8.05 24,243 -19.44 0.0472
2022-11-14 2022-06-30 13F/A-2 SITEONE LANDSCAPE SUPPLY COM 82982L103 253,169 -9,785 -3.72 30,094 -29.22 0.0566
2022-09-13 2022-06-30 13F/A-1 SITEONE LANDSCAPE SUPPLY COM 82982L103 243,620 -12,405 28,959 0.0501
2022-08-02 2022-06-30 13F SITEONE LANDSCAPE SUPPLY COM 82982L103 249,788 -9,634 30,788 0.0205
2022-11-14 2022-03-31 13F/A-2 SITEONE LANDSCAPE SUPPLY COM 82982L103 262,954 -244,443 -48.18 42,517 -65.41 0.0634
2022-09-13 2022-03-31 13F/A-1 SITEONE LANDSCAPE SUPPLY COM 82982L103 256,025 -251,372 41,396 0.0581
2022-05-09 2022-03-31 13F SITEONE LANDSCAPE SUPPLY COM 82982L103 259,422 -247,975 42,661 0.0580
2022-01-27 2021-12-31 13F SITEONE LANDSCAPE SUPPLY COM 82982L103 507,397 -162,229 -24.23 122,932 -7.96 0.1523
2021-11-12 2021-09-30 13F SITEONE LANDSCAPE SUPPLY COM 82982L103 669,626 3,438 0.52 133,570 18.46 0.1972
2021-07-29 2021-06-30 13F SITEONE LANDSCAPE SUPPLY COM 82982L103 666,188 -7,846 -1.16 112,760 -2.02 0.1700
2021-05-14 2021-03-31 13F SITEONE LANDSCAPE SUPPLY COM 82982L103 674,034 -294,512 -30.41 115,084 -25.10 0.1968
2021-02-12 2020-12-31 13F SITEONE LANDSCAPE SUPPLY COM 82982L103 968,546 -177,672 -15.50 153,641 9.91 0.2727
2020-11-16 2020-09-30 13F SITEONE LANDSCAPE SUPPLY COM 82982L103 1,146,218 5,069 0.44 139,782 7.48 0.2888
2020-08-14 2020-06-30 13F SITEONE LANDSCAPE SUPPLY COM 82982L103 1,141,149 -68,035 -5.63 130,058 46.10 0.3030
2020-05-15 2020-03-31 13F SITEONE LANDSCAPE SUPPLY COM 82982L103 1,209,184 -12,327 -1.01 89,019 -19.61 0.2727
2020-02-14 2019-12-31 13F SITEONE LANDSCAPE SUPPLY COM 82982L103 1,221,511 9,163 0.76 110,729 23.39 0.2809
2019-11-14 2019-09-30 13F SITEONE LANDSCAPE SUPPLY COM 82982L103 1,212,348 50,678 4.36 89,738 11.47 0.2518
2019-08-12 2019-06-30 13F SITEONE LANDSCAPE SUPPLY COM 82982L103 1,161,670 133,899 13.03 80,502 37.06 0.2303
2019-05-15 2019-03-31 13F SITEONE LANDSCAPE SUPPLY COM 82982L103 1,027,771 234,750 29.60 58,737 34.01 0.1666
2019-02-13 2018-12-31 13F SITEONE LANDSCAPE SUPPLY COM 82982L103 793,021 381,468 92.69 43,829 41.37 0.1472
2018-11-13 2018-09-30 13F SITEONE LANDSCAPE SUPPLY COM 82982L103 411,553 -105,782 -20.45 31,004 -28.63 0.0882
2018-08-10 2018-06-30 13F SITEONE LANDSCAPE SUPPLY COM 82982L103 517,335 9,474 1.87 43,441 11.03 0.1336
2018-06-28 2018-03-31 13F/A-1 SITEONE LANDSCAPE SUPPLY COM 82982L103 507,861 4,499 0.89 39,125 1.34 0.1265
2018-05-14 2018-03-31 13F SITEONE LANDSCAPE SUPPLY COM 82982L103 295,738 -207,624 22,783
2018-02-12 2017-12-31 13F SITEONE LANDSCAPE SUPPLY COM 82982L103 503,362 -162,722 -24.43 38,607 -0.24 0.1222
2017-11-13 2017-09-30 13F SITEONE LANDSCAPE SUPPLY COM 82982L103 666,084 35,916 5.70 38,699 17.96 0.1283
2017-08-14 2017-06-30 13F SITEONE LANDSCAPE SUPPLY COM 82982L103 630,168 12,072 1.95 32,807 9.65 0.1003
2017-05-15 2017-03-31 13F SITEONE LANDSCAPE SUPPLY COM 82982L103 618,096 35,385 6.07 29,921 47.85 0.1021
2017-02-13 2016-12-31 13F SITEONE LANDSCAPE SUPPLY COM 82982L103 582,711 376,119 182.06 20,238 172.64 0.0723
2016-11-14 2016-09-30 13F SITEONE LANDSCAPE SUPPLY COM 82982L103 206,592 206,592 7,423 0.0255
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.