Ross Stores, Inc.
MX ˙ BMV ˙ US7782961038
SecurityMX:ROST / Ross Stores, Inc.
InstitutionCalamos Advisors LLC
Latest Disclosed Ownership88,483 shares
Latest Disclosed Value $ 19,168,073
Calamos Advisors LLC reports 1.12% increase in ownership of ROST / Ross Stores, Inc.

On May 4, 2026 - Calamos Advisors LLC filed a 13F-HR form disclosing ownership of 88,483 shares of Ross Stores, Inc. (MX:ROST) valued at $19,168,073 USD as of March 31, 2026. The entity filed a previous 13F-HR on January 29, 2026 disclosing 87,501 shares of Ross Stores, Inc.. This represents a change in shares of 1.12% 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)
2026-05-04 2026-03-31 13F ROSS STORES COM 778296103 88,483 982 1.12 19,168 21.61 0.0676
2026-01-29 2025-12-31 13F ROSS STORES COM 778296103 87,501 -3,553 -3.90 15,762 13.60 0.0592
2025-10-20 2025-09-30 13F ROSS STORES COM 778296103 91,054 0 0.00 13,876 19.45 0.0512
2025-08-08 2025-06-30 13F ROSS STORES COM 778296103 91,054 0 0.00 11,617 -0.16 0.0457
2025-04-29 2025-03-31 13F ROSS STORES COM 778296103 91,054 1,014 1.13 11,636 -14.57 0.0506
2025-01-24 2024-12-31 13F ROSS STORES COM 778296103 90,040 0 0.00 13,620 0.51 0.0570
2024-11-07 2024-09-30 13F ROSS STORES COM 778296103 90,040 -2,209 -2.39 13,552 1.09 0.0586
2024-07-25 2024-06-30 13F ROSS STORES COM 778296103 92,249 -3,367 -3.52 13,406 -4.47 0.0595
2024-05-08 2024-03-31 13F ROSS STORES COM 778296103 95,616 -2,405 -2.45 14,033 3.44 0.0665
2024-01-31 2023-12-31 13F ROSS STORES COM 778296103 98,021 -1,280 -1.29 13,565 20.94 0.0658
2023-10-26 2023-09-30 13F ROSS STORES COM 778296103 99,301 0 0.00 11,216 0.74 0.0583
2023-07-28 2023-06-30 13F ROSS STORES COM 778296103 99,301 0 0.00 11,135 5.66 0.0551
2023-05-04 2023-03-31 13F ROSS STORES COM 778296103 99,301 -12,415 -11.11 10,539 -18.73 0.0515
2023-01-26 2022-12-31 13F ROSS STORES COM 778296103 111,716 -19,752 -15.02 12,967 17.03 0.0608
2022-10-24 2022-09-30 13F ROSS STORES COM 778296103 131,468 0 0.00 11,079 19.99 0.0507
2022-08-01 2022-06-30 13F ROSS STORES COM 778296103 131,468 3,540 2.77 9,233 -20.21 0.0398
2022-05-03 2022-03-31 13F ROSS STORES COM 778296103 127,928 17,052 15.38 11,572 -8.67 0.0434
2022-02-01 2021-12-31 13F ROSS STORES COM 778296103 110,876 4,292 4.03 12,671 9.21 0.0474
2021-10-26 2021-09-30 13F ROSS STORES COM 778296103 106,584 9,405 9.68 11,602 -3.72 0.0507
2021-07-22 2021-06-30 13F ROSS STORES COM 778296103 97,179 22,103 29.44 12,050 33.86 0.0551
2021-04-12 2021-03-31 13F ROSS STORES COM 778296103 75,076 2,320 3.19 9,002 0.75 0.0491
2021-01-27 2020-12-31 13F ROSS STORES COM 778296103 72,756 -3,151 -4.15 8,935 26.13 0.0519
2020-10-26 2020-09-30 13F ROSS STORES COM 778296103 75,907 -6,661 -8.07 7,084 0.65 0.0456
2020-07-27 2020-06-30 13F ROSS STORES COM 778296103 82,568 -5,283 -6.01 7,038 -7.88 0.0497
2020-04-28 2020-03-31 13F ROSS STORES COM 778296103 87,851 -8,820 -9.12 7,640 -32.11 0.0599
2020-01-15 2019-12-31 13F ROSS STORES COMMON STOCK 778296103 96,671 -1,147 -1.17 11,254 4.74 0.0556
2019-10-21 2019-09-30 13F ROSS STORES COMMON STOCK 778296103 97,818 9,441 10.68 10,745 22.66 0.0585
2019-08-07 2019-06-30 13F ROSS STORES COMMON STOCK 778296103 88,377 4,399 5.24 8,760 12.05 0.0486
2019-04-12 2019-03-31 13F ROSS STORES COMMON STOCK 778296103 83,978 842 1.01 7,818 13.03 0.0488
2019-01-24 2018-12-31 13F ROSS STORES COMMON STOCK 778296103 83,136 12,447 17.61 6,917 -1.26 0.0457
2018-10-22 2018-09-30 13F ROSS STORES COMMON STOCK 778296103 70,689 40,241 132.16 7,005 171.51 0.0385
2018-07-17 2018-06-30 13F ROSS STORES COMMON STOCK 778296103 30,448 -20,280 -39.98 2,580 -34.78 0.0158
2018-04-13 2018-03-31 13F ROSS STORES COMMON STOCK 778296103 50,728 2,392 4.95 3,956 1.99 0.0257
2018-02-13 2017-12-31 13F ROSS STORES COMMON STOCK 778296103 48,336 -1,025 -2.08 3,879 21.71 0.0198
2017-10-25 2017-09-30 13F ROSS STORES COMMON STOCK 778296103 49,361 1,807 3.80 3,187 16.10 0.0246
2017-08-09 2017-06-30 13F ROSS STORES COMMON STOCK 778296103 47,554 7,398 18.42 2,745 3.78 0.0203
2017-04-20 2017-03-31 13F ROSS STORES COMMON STOCK 778296103 40,156 -16,954 -29.69 2,645 -29.39 0.0208
2017-02-06 2016-12-31 13F ROSS STORES COMMON STOCK 778296103 57,110 -7,129 -11.10 3,746 -9.32 0.0298
2016-11-14 2016-09-30 13F ROSS STORES COMMON STOCK 778296103 64,239 -692,242 -91.51 4,131 -90.37 0.0295
2016-07-26 2016-06-30 13F ROSS STORES COMMON STOCK 778296103 756,481 715,847 1,761.69 42,885 1,722.57 0.3009
2016-04-25 2016-03-31 13F ROSS STORES COMMON STOCK 778296103 40,634 2,536 6.66 2,353 14.78 0.0156
2016-02-05 2015-12-31 13F ROSS STORES COMMON STOCK 778296103 38,098 0 0.00 2,050 10.99 0.0130
2015-11-10 2015-09-30 13F ROSS STORES COMMON STOCK 778296103 38,098 14 0.04 1,847 -0.22 0.0127
2015-08-14 2015-06-30 13F ROSS STORES COMMON STOCK 778296103 38,084 17,967 89.31 1,851 -12.69 0.0114
2015-05-13 2015-03-31 13F ROSS STORES COMMON STOCK 778296103 20,117 13 0.06 2,120 11.87 0.0133
2015-02-13 2014-12-31 13F ROSS STORES COMMON STOCK 778296103 20,104 104 0.52 1,895 25.33 0.0125
2014-11-14 2014-09-30 13F ROSS STORES COMMON STOCK 778296103 20,000 0 0.00 1,512 14.29 0.0101
2014-08-14 2014-06-30 13F ROSS STORES COMMON STOCK 778296103 20,000 0 0.00 1,323 -7.55 0.0084
2014-05-16 2014-03-31 13F ROSS STORES COMMON STOCK 778296103 20,000 0 0.00 1,431 -4.54 0.0091
2014-02-14 2013-12-31 13F ROSS STORES COMMON STOCK 778296103 20,000 -20,000 -50.00 1,499 -48.52 0.0095
2013-11-14 2013-09-30 13F ROSS STORES COMMON STOCK 778296103 40,000 15,000 60.00 2,912 79.75 0.0183
2013-08-12 2013-06-30 13F ROSS STORES COMMON STOCK 778296103 25,000 25,000 1,620 0.0106
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.