Ross Stores, Inc.
MX ˙ BMV ˙ US7782961038
SecurityMX:ROST / Ross Stores, Inc.
InstitutionAcadian Asset Management Llc
Latest Disclosed Ownership1,287,678 shares
Latest Disclosed Value $ 278,922
Acadian Asset Management Llc reports 162.05% increase in ownership of ROST / Ross Stores, Inc.

On May 13, 2026 - Acadian Asset Management Llc filed a 13F-HR form disclosing ownership of 1,287,678 shares of Ross Stores, Inc. (MX:ROST) valued at $278,922 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 10, 2026 disclosing 491,383 shares of Ross Stores, Inc.. This represents a change in shares of 162.05% 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)
2026-05-13 2026-03-31 13F ROSS STORES COM 778296103 1,287,678 796,295 162.05 279 215.91 0.3957
2026-02-10 2025-12-31 13F ROSS STORES COM 778296103 491,383 463,563 1,666.29 89 2,100.00 0.1453
2025-11-13 2025-09-30 13F ROSS STORES COM 778296103 27,820 27,820 4 0.0074
2025-08-07 2025-06-30 13F ROSS STORES COM 778296103 0 -12,524 -100.00 0 -100.00
2025-05-21 2025-03-31 13F ROSS STORES COM 778296103 12,524 -40,136 -76.22 2 -85.71 0.0045
2025-02-11 2024-12-31 13F ROSS STORES COM 778296103 52,660 -274,700 -83.91 8 -85.71 0.0231
2024-11-12 2024-09-30 13F ROSS STORES COM 778296103 327,360 -32,178 -8.95 49 -5.77 0.1531
2024-08-06 2024-06-30 13F ROSS STORES COM 778296103 359,538 273,545 318.10 52 333.33 0.1609
2024-05-10 2024-03-31 13F ROSS STORES COM 778296103 85,993 -157,081 -64.62 13 -63.64 0.0440
2024-02-13 2023-12-31 13F ROSS STORES COM 778296103 243,074 333 0.14 34 22.22 0.1304
2023-11-13 2023-09-30 13F ROSS STORES COM 778296103 242,741 235,067 3,063.16 27 0.1149
2023-08-07 2023-06-30 13F ROSS STORES COM 778296103 7,674 311 4.22 1 0.0035
2023-05-11 2023-03-31 13F ROSS STORES COM 778296103 7,363 -77,320 -91.31 1 -100.00 0.0034
2023-02-14 2022-12-31 13F ROSS STORES COM 778296103 84,683 84,683 10 0.0484
2022-02-10 2021-12-31 13F ROSS STORES COM 778296103 0 -3,780 -100.00 0 -100.00
2021-11-12 2021-09-30 13F ROSS STORES COM 778296103 3,780 -7,747 -67.21 410 -71.33 0.0016
2021-08-11 2021-06-30 13F ROSS STORES COM 778296103 11,527 6,908 149.56 1,430 158.12 0.0054
2021-05-11 2021-03-31 13F ROSS STORES COM 778296103 4,619 -3,628 -43.99 554 -45.31 0.0022
2021-02-11 2020-12-31 13F ROSS STORES COM 778296103 8,247 6,592 398.31 1,013 557.79 0.0039
2020-11-09 2020-09-30 13F ROSS STORES COM 778296103 1,655 813 96.56 154 113.89 0.0006
2020-08-12 2020-06-30 13F ROSS STORES COM 778296103 842 -298 -26.14 72 -27.27 0.0003
2020-05-11 2020-03-31 13F ROSS STORES COM 778296103 1,140 -934 -45.03 99 -58.92 0.0006
2020-02-06 2019-12-31 13F ROSS STORES COM 778296103 2,074 -11,366 -84.57 241 -83.67 0.0011
2019-11-07 2019-09-30 13F ROSS STORES COM 778296103 13,440 -12,566 -48.32 1,476 -42.72 0.0063
2019-08-08 2019-06-30 13F ROSS STORES COM 778296103 26,006 -164,411 -86.34 2,577 -85.46 0.0124
2019-05-09 2019-03-31 13F ROSS STORES COM 778296103 190,417 -52,654 -21.66 17,728 -12.35 0.0763
2019-02-07 2018-12-31 13F ROSS STORES COM 778296103 243,071 188,161 342.67 20,225 271.65 0.1001
2018-10-30 2018-09-30 13F ROSS STORES COM 778296103 54,910 -26,829 -32.82 5,442 -21.43 0.0225
2018-07-24 2018-06-30 13F ROSS STORES COM 778296103 81,739 -4,071 -4.74 6,926 3.50 0.0299
2018-04-12 2018-03-31 13F ROSS STORES COM 778296103 85,810 27,563 47.32 6,692 43.18 0.0289
2018-01-18 2017-12-31 13F ROSS STORES COM 778296103 58,247 8,757 17.69 4,674 46.38 0.0203
2017-10-13 2017-09-30 13F ROSS STORES COM 778296103 49,490 17,440 54.41 3,193 72.50 0.0141
2017-07-25 2017-06-30 13F ROSS STORES COM 778296103 32,050 1,713 5.65 1,851 -7.36 0.0084
2017-04-25 2017-03-31 13F ROSS STORES COM 778296103 30,337 -74,769 -71.14 1,998 -71.02 0.0092
2017-01-19 2016-12-31 13F ROSS STORES COM 778296103 105,106 100,433 2,149.22 6,894 2,190.37 0.0335
2016-10-20 2016-09-30 13F ROSS STORES COM 778296103 4,673 4,673 0.00 301 0.0015
2016-04-14 2016-03-31 13F ROSS STORES COM 778296103 0 0 0 0.0000
2016-01-14 2015-12-31 13F ROSS STORES COM 778296103 0 -26,279 -100.00 0 -100.00
2015-10-15 2015-09-30 13F ROSS STORES COM 778296103 26,279 -29,351 -52.76 1,273 -52.90 0.0069
2015-08-11 2015-06-30 13F ROSS STORES COM 778296103 55,630 55,560 79,371.43 2,703 38,514.29 0.0131
2015-04-20 2015-03-31 13F/A-1 ROSS STORES COM 778296103 70 0 0.00 7 0.00 0.0000
2015-01-23 2014-12-31 13F ROSS STORES COM 778296103 70 70 7 0.0000
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.