Ross Stores, Inc.
MX ˙ BMV ˙ US7782961038
SecurityMX:ROST / Ross Stores, Inc.
InstitutionPrimecap Management Co/ca/
Latest Disclosed Ownership9,170,030 shares
Latest Disclosed Value $ 1,986,503,598
Primecap Management Co/ca/ reports 0.40% decrease in ownership of ROST / Ross Stores, Inc.

On May 11, 2026 - Primecap Management Co/ca/ filed a 13F-HR form disclosing ownership of 9,170,030 shares of Ross Stores, Inc. (MX:ROST) valued at $1,986,503,598 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 11, 2026 disclosing 9,207,200 shares of Ross Stores, Inc.. This represents a change in shares of -0.40% 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)
2026-05-11 2026-03-31 13F ROSS STORES COM 778296103 9,170,030 -37,170 -0.40 1,986,504 19.77 1.5640
2026-02-11 2025-12-31 13F ROSS STORES COM 778296103 9,207,200 -747,710 -7.51 1,658,585 9.33 1.2555
2025-11-12 2025-09-30 13F ROSS STORES COM 778296103 9,954,910 -313,790 -3.06 1,517,029 15.80 1.1619
2025-08-11 2025-06-30 13F ROSS STORES COM 778296103 10,268,700 51,765 0.51 1,310,081 0.34 1.0382
2025-05-09 2025-03-31 13F ROSS STORES COM 778296103 10,216,935 -147,890 -1.43 1,305,622 -16.73 1.0794
2025-02-10 2024-12-31 13F ROSS STORES COM 778296103 10,364,825 -171,142 -1.62 1,567,887 -1.13 1.2143
2024-11-08 2024-09-30 13F ROSS STORES COM 778296103 10,535,967 -114,750 -1.08 1,585,768 2.46 1.1659
2024-08-09 2024-06-30 13F ROSS STORES COM 778296103 10,650,717 -62,207 -0.58 1,547,762 -1.56 1.1205
2024-05-14 2024-03-31 13F ROSS STORES COM 778296103 10,712,924 -93,880 -0.87 1,572,229 5.13 1.1726
2024-02-09 2023-12-31 13F ROSS STORES COM 778296103 10,806,804 -105,345 -0.97 1,495,554 21.34 1.1840
2023-11-13 2023-09-30 13F ROSS STORES COM 778296103 10,912,149 -80,315 -0.73 1,232,527 0.00 1.0404
2023-08-11 2023-06-30 13F ROSS STORES COM 778296103 10,992,464 -282,960 -2.51 1,232,585 3.00 1.0299
2023-05-15 2023-03-31 13F ROSS STORES COM 778296103 11,275,424 95,230 0.85 1,196,661 -7.79 1.0435
2023-02-13 2022-12-31 13F ROSS STORES COM 778296103 11,180,194 -121,310 -1.07 1,297,685 36.26 1.1880
2022-11-14 2022-09-30 13F ROSS STORES COM 778296103 11,301,504 -13,940 -0.12 952,378 19.84 0.9216
2022-08-11 2022-06-30 13F ROSS STORES COM 778296103 11,315,444 -28,715 -0.25 794,684 -22.56 0.7103
2022-05-11 2022-03-31 13F ROSS STORES COM 778296103 11,344,159 57,260 0.51 1,026,193 -20.44 0.7740
2022-02-11 2021-12-31 13F ROSS STORES COM 778296103 11,286,899 -161,770 -1.41 1,289,867 3.51 0.8928
2021-11-12 2021-09-30 13F ROSS STORES COM 778296103 11,448,669 -5,980 -0.05 1,246,188 -12.26 0.8796
2021-08-10 2021-06-30 13F ROSS STORES COM 778296103 11,454,649 -187,540 -1.61 1,420,376 1.75 0.9543
2021-05-14 2021-03-31 13F ROSS STORES COM 778296103 11,642,189 672,600 6.13 1,396,015 3.63 0.9735
2021-02-08 2020-12-31 13F ROSS STORES COM 778296103 10,969,589 -19,760 -0.18 1,347,175 31.36 1.0013
2020-11-13 2020-09-30 13F ROSS STORES COM 778296103 10,989,349 94,470 0.87 1,025,526 10.43 0.8461
2020-08-13 2020-06-30 13F ROSS STORES COM 778296103 10,894,879 -291,530 -2.61 928,679 -4.54 0.7969
2020-05-14 2020-03-31 13F ROSS STORES COM 778296103 11,186,409 -180,410 -1.59 972,882 -26.48 0.9540
2020-02-14 2019-12-31 13F ROSS STORES COM 778296103 11,366,819 -27,000 -0.24 1,323,325 5.73 0.9598
2019-11-13 2019-09-30 13F ROSS STORES COM 778296103 11,393,819 -213,100 -1.84 1,251,611 8.79 1.0010
2019-08-14 2019-06-30 13F ROSS STORES COM 778296103 11,606,919 -800,342 -6.45 1,150,478 -0.40 0.8507
2019-05-14 2019-03-31 13F ROSS STORES COM 778296103 12,407,261 -15,050 -0.12 1,155,116 11.76 0.8501
2019-02-12 2018-12-31 13F ROSS STORES COM 778296103 12,422,311 -28,480 -0.23 1,033,536 -16.24 0.8374
2018-11-13 2018-09-30 13F ROSS STORES COM 778296103 12,450,791 -56,388 -0.45 1,233,873 16.40 0.8329
2018-08-13 2018-06-30 13F ROSS STORES COM 778296103 12,507,179 -403,770 -3.13 1,059,983 5.28 0.7859
2018-05-14 2018-03-31 13F ROSS STORES COM 778296103 12,910,949 -371,198 -2.79 1,006,796 -5.54 0.7554
2018-02-13 2017-12-31 13F ROSS STORES COM 778296103 13,282,147 -1,068,953 -7.45 1,065,892 15.03 0.8180
2017-11-13 2017-09-30 13F ROSS STORES COM 778296103 14,351,100 -235,400 -1.61 926,651 10.04 0.7670
2017-08-11 2017-06-30 13F ROSS STORES COM 778296103 14,586,500 -81,300 -0.55 842,079 -12.84 0.7234
2017-05-12 2017-03-31 13F ROSS STORES COM 778296103 14,667,800 -124,700 -0.84 966,168 -0.43 0.8769
2017-02-13 2016-12-31 13F ROSS STORES COM 778296103 14,792,500 -57,600 -0.39 970,388 1.63 0.9549
2016-11-14 2016-09-30 13F ROSS STORES COM 778296103 14,850,100 -446,400 -2.92 954,861 10.11 0.9530
2016-08-12 2016-06-30 13F ROSS STORES COM 778296103 15,296,500 259,700 1.73 867,159 -0.40 0.9233
2016-05-12 2016-03-31 13F ROSS STORES COM 778296103 15,036,800 18,500 0.12 870,631 7.73 0.9030
2016-02-12 2015-12-31 13F ROSS STORES COM 778296103 15,018,300 19,200 0.13 808,135 11.16 0.8262
2015-11-12 2015-09-30 13F ROSS STORES COM 778296103 14,999,100 -1,147,400 -7.11 727,006 -7.37 0.8070
2015-08-13 2015-06-30 13F ROSS STORES COM 778296103 16,146,500 8,054,760 99.54 784,881 -7.94 0.7720
2015-05-14 2015-03-31 13F ROSS STORES COM 778296103 8,091,740 7,250 0.09 852,546 11.88 0.8326
2015-02-12 2014-12-31 13F ROSS STORES COM 778296103 8,084,490 -23,000 -0.28 762,044 24.36 0.7722
2014-11-13 2014-09-30 13F ROSS STORES COM 778296103 8,107,490 866,140 11.96 612,764 27.96 0.6556
2014-08-14 2014-06-30 13F ROSS STORES COM 778296103 7,241,350 744,910 11.47 478,870 2.99 0.5243
2014-05-14 2014-03-31 13F ROSS STORES COM 778296103 6,496,440 3,674,610 130.22 464,950 119.90 0.5262
2014-02-13 2013-12-31 13F ROSS STORES COM 778296103 2,821,830 712,780 33.80 211,440 37.71 0.2541
2013-11-13 2013-09-30 13F ROSS STORES COM 778296103 2,109,050 -3,800 -0.18 153,539 12.13 0.2020
2013-08-14 2013-06-30 13F ROSS STORES COM 778296103 2,112,850 2,112,850 136,934 0.1958
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.