Ross Stores, Inc.
MX ˙ BMV ˙ US7782961038
SecurityMX:ROST / Ross Stores, Inc.
InstitutionBlair William & Co/il
Latest Disclosed Ownership20,225 shares
Latest Disclosed Value $ 4,381,418
Blair William & Co/il ownership in ROST / Ross Stores, Inc.

On May 8, 2026 - Blair William & Co/il filed a 13F-HR form disclosing ownership of 20,225 shares of Ross Stores, Inc. (MX:ROST) valued at $4,381,418 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 17, 2026 disclosing 20,322 shares of Ross Stores, Inc.. This represents a change in shares of -0.48% during the quarter.

Blair William & Co/il has a history of taking positions in derivatives of the underlying security (ROST) in the form of stock options. The firm currently holds call options representing 0 of underlying shares valued at $0 USD .

Note: prior versions of this page mistakenly stated that the share values represented the number of options, not the number of underlying shares. For more information on the data backing these reports, please see the SEC document Frequently Asked Questions About Form 13F.

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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Institutional Put/Call Ratios
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In addition to reporting standard equity and debt issues, institutions with more than 100MM assets under management must also disclose their put and call option holdings. Since put options generally indicate negative sentiment, and call options indicate positive sentiment, we can get a sense of the overall institutional sentiment by plotting the ratio of puts to calls. The chart to the right plots the historical put/call ratio for this instrument.

Using Put/Call Ratio as an indicator of investor sentiment overcomes one of the key deficiencies of using total institutional ownership, which is that a significant amount of assets under management are invested passively to track indices. Passively-managed funds do not typically buy options, so the put/call ratio indicator more closely tracks the sentiment of actively-managed funds.

MX:ROST / Ross Stores, Inc. Historical Put/Call Ratio
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)
2026-05-08 2026-03-31 13F ROSS STORES COM 778296103 20,225 -97 -0.48 4,381 19.70 0.0126
2026-02-17 2025-12-31 13F ROSS STORES COM 778296103 20,322 208 1.03 3,661 19.41 0.0076
2025-11-12 2025-09-30 13F ROSS STORES COM 778296103 20,114 66 0.33 3,065 19.87 0.0082
2025-07-24 2025-06-30 13F ROSS STORES COM 778296103 20,048 15 0.07 2,558 -0.08 0.0071
2025-05-09 2025-03-31 13F ROSS STORES COM 778296103 20,033 -109 -0.54 2,560 -15.99 0.0077
2025-02-12 2024-12-31 13F ROSS STORES COM 778296103 20,142 -47 -0.23 3,047 0.26 0.0089
2024-11-12 2024-09-30 13F ROSS STORES COM 778296103 20,189 305 1.53 3,039 5.16 0.0089
2024-08-12 2024-06-30 13F ROSS STORES COM 778296103 19,884 -7 -0.04 2,890 -1.03 0.0089
2024-05-09 2024-03-31 13F ROSS STORES COM 778296103 19,891 44 0.22 2,919 6.30 0.0092
2024-02-12 2023-12-31 13F ROSS STORES COM 778296103 19,847 342 1.75 2,747 24.65 0.0094
2023-11-09 2023-09-30 13F ROSS STORES COM 778296103 19,505 12,809 191.29 2,203 193.73 0.0084
2023-08-11 2023-06-30 13F ROSS STORES COM 778296103 6,696 -307 -4.38 751 0.94 0.0028
2023-05-12 2023-03-31 13F ROSS STORES COM 778296103 7,003 92 1.33 743 -7.36 0.0030
2023-02-10 2022-12-31 13F ROSS STORES COM 778296103 6,911 -319 -4.41 802 31.69 0.0035
2022-11-09 2022-09-30 13F ROSS STORES COM 778296103 7,230 -298 -3.96 609 15.12 0.0028
2022-08-10 2022-06-30 13F ROSS STORES COM 778296103 7,528 376 5.26 529 -18.24 0.0023
2022-05-13 2022-03-31 13F ROSS STORES COM 778296103 7,152 -3,214 -31.01 647 -45.40 0.0023
2022-02-14 2021-12-31 13F ROSS STORES COM 778296103 10,366 3,666 54.72 1,185 62.55 0.0037
2021-11-12 2021-09-30 13F ROSS STORES COM 778296103 6,700 134 2.04 729 -10.44 0.0025
2021-08-12 2021-06-30 13F ROSS STORES COM 778296103 6,566 -1,639 -19.98 814 -17.28 0.0028
2021-05-13 2021-03-31 13F ROSS STORES COM 778296103 8,205 1,677 25.69 984 22.69 0.0037
2021-02-09 2020-12-31 13F ROSS STORES COM 778296103 6,528 -75 -1.14 802 30.19 0.0029
2020-11-06 2020-09-30 13F ROSS STORES COM 778296103 6,603 -579 -8.06 616 0.65 0.0026
2020-08-12 2020-06-30 13F ROSS STORES COM 778296103 7,182 -5,810 -44.72 612 -45.84 0.0029
2020-05-11 2020-03-31 13F ROSS STORES COM 778296103 12,992 -9,306 -41.73 1,130 -56.47 0.0071
2020-02-13 2019-12-31 13F ROSS STORES COM 778296103 22,298 1,214 5.76 2,596 12.09 0.0133
2019-11-12 2019-09-30 13F ROSS STORES COM 778296103 21,084 -34 -0.16 2,316 10.65 0.0133
2019-08-13 2019-06-30 13F ROSS STORES COM 778296103 21,118 -1,689 -7.41 2,093 -1.41 0.0120
2019-05-14 2019-03-31 13F ROSS STORES COM 778296103 22,807 3,229 16.49 2,123 30.33 0.0129
2019-02-14 2018-12-31 13F ROSS STORES COM 778296103 19,578 2,317 13.42 1,629 -4.79 0.0119
2018-11-13 2018-09-30 13F ROSS STORES COM 778296103 17,261 4,574 36.05 1,711 59.16 0.0105
2018-08-13 2018-06-30 13F ROSS STORES COM 778296103 12,687 780 6.55 1,075 15.72 0.0073
2018-05-15 2018-03-31 13F ROSS STORES COM 778296103 11,907 3,836 47.53 929 43.36 0.0066
2018-02-14 2017-12-31 13F ROSS STORES COM 778296103 8,071 -1,227 -13.20 648 8.00 0.0044
2017-11-13 2017-09-30 13F ROSS STORES COM 778296103 9,298 -14 -0.15 600 11.52 0.0045
2017-08-04 2017-06-30 13F ROSS STORES COM 778296103 9,312 -1,118 -10.72 538 -24.65 0.0040
2017-05-10 2017-03-31 13F ROSS STORES COM 778296103 10,430 -777 -6.93 714 -2.86 0.0058
2017-02-14 2016-12-31 13F ROSS STORES COM 778296103 11,207 -422 -3.63 735 -1.74 0.0066
2016-11-14 2016-09-30 13F ROSS STORES COM 778296103 11,629 2,298 24.63 748 41.40 0.0066
2016-08-08 2016-06-30 13F ROSS STORES COM 778296103 9,331 3,751 67.22 529 64.29 0.0049
2016-05-16 2016-03-31 13F ROSS STORES COM 778296103 5,580 -40 -0.71 322 6.62 0.0030
2016-02-16 2015-12-31 13F ROSS STORES COM 778296103 5,620 -443 -7.31 302 3.07 0.0028
2015-11-12 2015-09-30 13F ROSS STORES COM 778296103 6,063 -2,321,125 -99.74 293 -99.74 0.0025
2015-08-03 2015-06-30 13F ROSS STORES COM 778296103 2,327,188 1,200,446 106.54 113,124 -4.71 0.1692
2015-05-11 2015-03-31 13F ROSS STORES COM 778296103 1,126,742 1,126,742 0.00 118,713 0.1828
2015-02-05 2014-12-31 13F ROSS STORES COM 778296103 0 -3,016 -100.00 0 -100.00
2014-11-04 2014-09-30 13F ROSS STORES COM 778296103 3,016 -1,147 -27.55 227 -17.45 0.0004
2014-08-01 2014-06-30 13F ROSS STORES COM 778296103 4,163 -3,873 -48.20 275 -52.09 0.0004
2014-05-06 2014-03-31 13F ROSS STORES COM 778296103 8,036 -127 -1.56 574 -6.06 0.0009
2014-02-11 2013-12-31 13F ROSS STORES COM 778296103 8,163 410 5.29 611 8.33 0.0010
2013-11-12 2013-09-30 13F ROSS STORES COM 778296103 7,753 -2,779 -26.39 564 -17.30 0.0010
2013-08-07 2013-06-30 13F ROSS STORES COM 778296103 10,532 10,532 682 0.0013
Disclosed Call Options
File
Date
Effective
Date
Form Security Class ID Opt Avg Share
Price
Shares ΔShares
(%)
Value
(x1000)
ΔValue
(%)
Prior Allocation
(%)
Allocation
(%)
ΔAllocation
(%)
Cost Basis
(x1000)
Profit
(x1000)
Return
(%)
2017-05-10 2017-03-31 13F ROSS STORES OPTION Call 0 -100.00 0 -100.00 n/a n/a n/a
2017-02-14 2016-12-31 13F ROSS STORES OPTION Call 200 13 n/a n/a n/a
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.