Southwest Airlines Co.
MX ˙ BMV ˙ US8447411088
SecurityMX:LUV / Southwest Airlines Co.
InstitutionCastleark Management Llc
Latest Disclosed Ownership1,560 shares
Latest Disclosed Value $ 58,609
Castleark Management Llc ownership in LUV / Southwest Airlines Co.

On May 15, 2026 - Castleark Management Llc filed a 13F-HR form disclosing ownership of 1,560 shares of Southwest Airlines Co. (MX:LUV) valued at $58,609 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 12, 2026 disclosing 1,560 shares of Southwest Airlines Co.. This represents a change in shares of 0.00% 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)
2026-05-15 2026-03-31 13F SOUTHWEST AIRLS COM 844741108 1,560 0 0.00 59 -9.37 0.0019
2026-02-12 2025-12-31 13F SOUTHWEST AIRLS COM 844741108 1,560 0 0.00 64 30.61 0.0019
2025-11-17 2025-09-30 13F SOUTHWEST AIRLS COM 844741108 1,560 0 0.00 50 -2.00 0.0014
2025-08-18 2025-06-30 13F SOUTHWEST AIRLS COM 844741108 1,560 0 0.00 51 -3.85 0.0015
2025-05-15 2025-03-31 13F SOUTHWEST AIRLS COM 844741108 1,560 0 0.00 52 0.00 0.0018
2025-02-18 2024-12-31 13F SOUTHWEST AIRLS COM 844741108 1,560 0 0.00 52 13.04 0.0018
2024-11-15 2024-09-30 13F SOUTHWEST AIRLS COM 844741108 1,560 0 0.00 46 4.55 0.0019
2024-08-14 2024-06-30 13F SOUTHWEST AIRLS COM 844741108 1,560 0 0.00 45 -2.22 0.0018
2024-05-16 2024-03-31 13F SOUTHWEST AIRLS COM 844741108 1,560 0 0.00 46 0.00 0.0019
2024-02-15 2023-12-31 13F SOUTHWEST AIRLS COM 844741108 1,560 0 0.00 45 7.14 0.0020
2023-11-15 2023-09-30 13F SOUTHWEST AIRLS COM 844741108 1,560 0 0.00 42 -25.00 0.0022
2023-08-16 2023-06-30 13F SOUTHWEST AIRLS COM 844741108 1,560 0 0.00 56 12.00 0.0026
2023-05-16 2023-03-31 13F SOUTHWEST AIRLS COM 844741108 1,560 0 0.00 51 -3.85 0.0025
2023-02-10 2022-12-31 13F SOUTHWEST AIRLS COM 844741108 1,560 0 0.00 53 8.33 0.0027
2022-11-15 2022-09-30 13F SOUTHWEST AIRLS COM 844741108 1,560 0 0.00 48 -14.29 0.0027
2022-08-16 2022-06-30 13F SOUTHWEST AIRLS COM 844741108 1,560 0 0.00 56 -21.13 0.0030
2022-05-16 2022-03-31 13F SOUTHWEST AIRLS COM 844741108 1,560 0 0.00 71 5.97 0.0031
2022-02-16 2021-12-31 13F SOUTHWEST AIRLS COM 844741108 1,560 0 0.00 67 -16.25 0.0025
2021-11-12 2021-09-30 13F SOUTHWEST AIRLS COM 844741108 1,560 -432,350 -99.64 80 -99.65 0.0031
2021-08-17 2021-06-30 13F SOUTHWEST AIRLS COM 844741108 433,910 110,320 34.09 23,036 16.59 0.7738
2021-05-14 2021-03-31 13F SOUTHWEST AIRLS COM 844741108 323,590 322,030 20,642.95 19,758 26,965.75 0.7114
2021-02-17 2020-12-31 13F SOUTHWEST AIRLS COM 844741108 1,560 0 0.00 73 23.73 0.0027
2020-11-16 2020-09-30 13F SOUTHWEST AIRLS COM 844741108 1,560 0 0.00 59 11.32 0.0023
2020-08-14 2020-06-30 13F SOUTHWEST AIRLS COM 844741108 1,560 0 0.00 53 -5.36 0.0023
2020-05-13 2020-03-31 13F SOUTHWEST AIRLS COM 844741108 1,560 0 0.00 56 -33.33 0.0033
2020-02-14 2019-12-31 13F SOUTHWEST AIRLS COM 844741108 1,560 0 0.00 84 0.00 0.0034
2019-11-15 2019-09-30 13F SOUTHWEST AIRLS COM 844741108 1,560 -34,180 -95.64 84 -95.37 0.0034
2019-08-13 2019-06-30 13F SOUTHWEST AIRLS COM 844741108 35,740 -5,100 -12.49 1,815 -14.39 0.0696
2019-05-14 2019-03-31 13F SOUTHWEST AIRLS COM 844741108 40,840 0 0.00 2,120 11.70 0.0798
2019-02-12 2018-12-31 13F SOUTHWEST AIRLS COM 844741108 40,840 0 0.00 1,898 -25.57 0.0809
2018-11-14 2018-09-30 13F SOUTHWEST AIRLS COM 844741108 40,840 0 0.00 2,550 22.71 0.0733
2018-08-15 2018-06-30 13F SOUTHWEST AIRLS COM 844741108 40,840 0 0.00 2,078 -11.16 0.0640
2018-05-14 2018-03-31 13F SOUTHWEST AIRLS COM 844741108 40,840 0 0.00 2,339 -12.50 0.0741
2018-02-15 2017-12-31 13F SOUTHWEST AIRLS COM 844741108 40,840 0 0.00 2,673 16.93 0.0803
2017-11-15 2017-09-30 13F SOUTHWEST AIRLS COM 844741108 40,840 0 0.00 2,286 -9.93 0.0718
2017-08-15 2017-06-30 13F SOUTHWEST AIRLS COM 844741108 40,840 0 0.00 2,538 15.57 0.0829
2017-05-15 2017-03-31 13F SOUTHWEST AIRLS COM 844741108 40,840 -1,600 -3.77 2,196 3.83 0.0688
2017-02-15 2016-12-31 13F SOUTHWEST AIRLS COM 844741108 42,440 0 0.00 2,115 28.18 0.0675
2016-11-15 2016-09-30 13F SOUTHWEST AIRLS COM 844741108 42,440 0 0.00 1,650 -0.84 0.0499
2016-08-10 2016-06-30 13F SOUTHWEST AIRLS COM 844741108 42,440 0 0.00 1,664 -12.47 0.0531
2016-05-17 2016-03-31 13F SOUTHWEST AIRLS COM 844741108 42,440 0 0.00 1,901 4.05 0.0594
2016-02-17 2015-12-31 13F SOUTHWEST AIRLS COM 844741108 42,440 -6,320 -12.96 1,827 -1.51 0.0549
2015-11-17 2015-09-30 13F SOUTHWEST AIRLS COM 844741108 48,760 0 0.00 1,855 15.00 0.0597
2015-08-17 2015-06-30 13F SOUTHWEST AIRLS COM 844741108 48,760 0 0.00 1,613 -25.32 0.0431
2015-05-15 2015-03-31 13F SOUTHWEST AIRLS COM 844741108 48,760 0 0.00 2,160 4.65 0.0521
2015-02-10 2014-12-31 13F SOUTHWEST AIRLS COM 844741108 48,760 -1,690 -3.35 2,064 73.30 0.0532
2014-11-17 2014-09-30 13F SOUTHWEST AIRLS COM 844741108 50,450 0 0.00 1,191 -12.10 0.0339
2014-08-15 2014-06-30 13F SOUTHWEST AIRLS COM 844741108 50,450 0 0.00 1,355 13.77 0.0373
2014-05-20 2014-03-31 13F SOUTHWEST AIRLS COM 844741108 50,450 0 0.00 1,191 25.37 0.0339
2014-02-20 2013-12-31 13F SOUTHWEST AIRLS COM 844741108 50,450 1,690 3.47 950 -42.32 0.0276
2014-11-21 2013-09-30 13F/A-1 SOUTHWEST AIRLS COM 844741108 48,760 -10,390 -17.57 1,647 116.14 0.0464
2013-11-20 2013-09-30 13F SOUTHWEST AIRLS COM 844741108 59,150 861
2013-09-26 2013-06-30 13F SOUTHWEST AIRLINES COM 844741108 59,150 59,150 762 0.0253
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.