Southwest Airlines Co.
MX ˙ BMV ˙ US8447411088
SecurityMX:LUV / Southwest Airlines Co.
InstitutionRenaissance Technologies Llc
ManagerJames Simons
Latest Disclosed Ownership197,380 shares
Latest Disclosed Value $ 7,415,567
Renaissance Technologies Llc ownership in LUV / Southwest Airlines Co.

On May 14, 2026 - Renaissance Technologies Llc filed a 13F-HR form disclosing ownership of 197,380 shares of Southwest Airlines Co. (MX:LUV) valued at $7,415,567 USD as of March 31, 2026. The entity filed a previous 13F-HR on August 13, 2025 disclosing 0 shares of Southwest Airlines Co..

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)
2026-05-14 2026-03-31 13F SOUTHWEST AIRLS COM 844741108 197,380 197,380 7,416 0.0116
2025-08-13 2025-06-30 13F SOUTHWEST AIRLS COM 844741108 0 -1,894,180 -100.00 0 -100.00
2025-05-14 2025-03-31 13F SOUTHWEST AIRLS COM 844741108 1,894,180 1,674,800 763.42 63,607 762.45 0.0963
2025-02-13 2024-12-31 13F SOUTHWEST AIRLS COM 844741108 219,380 108,600 98.03 7,376 124.71 0.0109
2024-11-13 2024-09-30 13F SOUTHWEST AIRLS COM 844741108 110,780 -83,500 -42.98 3,282 -40.95 0.0049
2024-08-09 2024-06-30 13F SOUTHWEST AIRLS COM 844741108 194,280 -117,100 -37.61 5,558 61,655.56 0.0094
2024-05-13 2024-03-31 13F SOUTHWEST AIRLS COM 844741108 311,380 311,380 9 0.0143
2023-11-14 2023-09-30 13F SOUTHWEST AIRLS COM 844741108 0 -868,483 -100.00 0 -100.00
2023-08-11 2023-06-30 13F SOUTHWEST AIRLS COM 844741108 868,483 -250,620 -22.39 31 -13.89 0.0453
2023-05-12 2023-03-31 13F SOUTHWEST AIRLS COM 844741108 1,119,103 -623,280 -35.77 36 -37.93 0.0483
2023-02-13 2022-12-31 13F SOUTHWEST AIRLS COM 844741108 1,742,383 494,103 39.58 59 -99.85 0.0803
2022-11-14 2022-09-30 13F SOUTHWEST AIRLS COM 844741108 1,248,280 513,580 69.90 38,497 45.07 0.0545
2022-08-12 2022-06-30 13F SOUTHWEST AIRLS COM 844741108 734,700 506,500 221.95 26,537 153.89 0.0314
2022-05-13 2022-03-31 13F SOUTHWEST AIRLS COM 844741108 228,200 -2,587,780 -91.90 10,452 -91.34 0.0123
2022-02-11 2021-12-31 13F SOUTHWEST AIRLS COM 844741108 2,815,980 795,400 39.36 120,637 16.09 0.1501
2021-11-12 2021-09-30 13F SOUTHWEST AIRLS COM 844741108 2,020,580 -219,400 -9.79 103,918 -12.62 0.1342
2021-08-13 2021-06-30 13F SOUTHWEST AIRLS COM 844741108 2,239,980 1,622,200 262.59 118,921 215.26 0.1485
2021-05-13 2021-03-31 13F SOUTHWEST AIRLS COM 844741108 617,780 -965,500 -60.98 37,722 -48.88 0.0469
2021-02-10 2020-12-31 13F SOUTHWEST AIRLS COM 844741108 1,583,280 1,451,500 1,101.46 73,797 1,393.26 0.0801
2020-11-13 2020-09-30 13F SOUTHWEST AIRLS COM 844741108 131,780 131,780 4,942 0.0049
2020-08-13 2020-06-30 13F SOUTHWEST AIRLS COM 844741108 0 -3,485,300 -100.00 0 -100.00
2020-05-14 2020-03-31 13F SOUTHWEST AIRLS COM 844741108 3,485,300 46,400 1.35 124,112 -33.14 0.1205
2020-02-13 2019-12-31 13F SOUTHWEST AIRLS COM 844741108 3,438,900 1,095,520 46.75 185,632 46.67 0.1427
2019-11-13 2019-09-30 13F SOUTHWEST AIRLS COM 844741108 2,343,380 1,731,600 283.04 126,566 307.41 0.1071
2019-08-12 2019-06-30 13F SOUTHWEST AIRLS COM 844741108 611,780 333,900 120.16 31,066 115.36 0.0274
2019-05-14 2019-03-31 13F SOUTHWEST AIRLS COM 844741108 277,880 -807,400 -74.40 14,425 -73.88 0.0131
2018-08-13 2018-06-30 13F/A-1 SOUTHWEST AIRLS COM 844741108 1,085,280 1,085,280 55,219 0.0602
2018-05-14 2018-03-31 13F SOUTHWEST AIRLS COM 844741108 0 -17,500 -100.00 0 -100.00
2018-02-13 2017-12-31 13F SOUTHWEST AIRLS COM 844741108 17,500 -1,266,180 -98.64 1,145 -98.41 0.0013
2017-11-13 2017-09-30 13F SOUTHWEST AIRLS COM 844741108 1,283,680 -247,700 -16.17 71,860 -24.49 0.0846
2017-08-11 2017-06-30 13F SOUTHWEST AIRLS COM 844741108 1,531,380 -67,920 -4.25 95,160 10.68 0.1214
2017-05-12 2017-03-31 13F SOUTHWEST AIRLS COM 844741108 1,599,300 -1,007,500 -38.65 85,978 -33.82 0.1201
2017-02-13 2016-12-31 13F SOUTHWEST AIRLS COM 844741108 2,606,800 900,300 52.76 129,923 95.77 0.2055
2016-11-14 2016-09-30 13F SOUTHWEST AIRLS COM 844741108 1,706,500 934,020 120.91 66,366 119.11 0.1173
2016-08-12 2016-06-30 13F SOUTHWEST AIRLS COM 844741108 772,480 772,480 0.00 30,289 0.0576
2016-05-13 2016-03-31 13F SOUTHWEST AIRLS COM 844741108 0 -309,180 -100.00 0 -100.00
2016-02-11 2015-12-31 13F SOUTHWEST AIRLS COM 844741108 309,180 155,380 101.03 13,313 127.53 0.0290
2015-11-12 2015-09-30 13F SOUTHWEST AIRLS COM 844741108 153,800 -4,504,180 -96.70 5,851 -96.20 0.0140
2015-08-14 2015-06-30 13F SOUTHWEST AIRLS COM 844741108 4,657,980 2,146,080 85.44 154,133 38.51 0.3512
2015-05-13 2015-03-31 13F SOUTHWEST AIRLS COM 844741108 2,511,900 503,800 25.09 111,277 30.94 0.2370
2015-02-13 2014-12-31 13F SOUTHWEST AIRLS COM 844741108 2,008,100 1,075,000 115.21 84,983 169.69 0.2052
2014-11-12 2014-09-30 13F SOUTHWEST AIRLS COM 844741108 933,100 -254,680 -21.44 31,511 -1.23 0.0863
2014-08-13 2014-06-30 13F SOUTHWEST AIRLS COM 844741108 1,187,780 -3,050,900 -71.98 31,904 -60.05 0.0744
2014-02-14 2013-12-31 13F SOUTHWEST AIRLS COM 844741108 4,238,680 2,212,000 109.14 79,857 170.63 0.1912
2013-11-13 2013-09-30 13F SOUTHWEST AIRLS COM 844741108 2,026,680 2,026,680 29,508 0.0716
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.