Southwest Airlines Co.
MX ˙ BMV ˙ US8447411088
SecurityMX:LUV / Southwest Airlines Co.
InstitutionSignaturefd, Llc
Latest Disclosed Ownership8,227 shares
Latest Disclosed Value $ 309,106
Signaturefd, Llc ownership in LUV / Southwest Airlines Co.

On April 7, 2026 - Signaturefd, Llc filed a 13F-HR form disclosing ownership of 8,227 shares of Southwest Airlines Co. (MX:LUV) valued at $309,106 USD as of March 31, 2026. The entity filed a previous 13F-HR on January 20, 2026 disclosing 7,350 shares of Southwest Airlines Co.. This represents a change in shares of 11.93% during the quarter.

Signaturefd, Llc has a history of taking positions in derivatives of the underlying security (LUV) 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:LUV / Southwest Airlines Co. 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)
2026-04-07 2026-03-31 13F SOUTHWEST AIRLS COM 844741108 8,227 877 11.93 309 1.98 0.0047
2026-01-20 2025-12-31 13F SOUTHWEST AIRLS COM 844741108 7,350 185 2.58 304 32.89 0.0046
2025-10-21 2025-09-30 13F SOUTHWEST AIRLS COM 844741108 7,165 -376 -4.99 229 -6.56 0.0036
2025-07-16 2025-06-30 13F SOUTHWEST AIRLS COM 844741108 7,541 -1,620 -17.68 245 -20.52 0.0042
2025-05-02 2025-03-31 13F SOUTHWEST AIRLS COM 844741108 9,161 450 5.17 308 5.14 0.0058
2025-02-10 2024-12-31 13F SOUTHWEST AIRLS COM 844741108 8,711 -803 -8.44 293 3.91 0.0055
2024-10-21 2024-09-30 13F SOUTHWEST AIRLS COM 844741108 9,514 -1,276 -11.83 282 -8.77 0.0054
2024-07-29 2024-06-30 13F SOUTHWEST AIRLS COM 844741108 10,790 -44 -0.41 309 -2.53 0.0063
2024-05-03 2024-03-31 13F SOUTHWEST AIRLS COM 844741108 10,834 1,162 12.01 316 13.26 0.0067
2024-02-01 2023-12-31 13F SOUTHWEST AIRLS COM 844741108 9,672 1,196 14.11 279 21.83 0.0064
2023-11-03 2023-09-30 13F SOUTHWEST AIRLS COM 844741108 8,476 -957 -10.15 229 -32.84 0.0060
2023-08-01 2023-06-30 13F SOUTHWEST AIRLS COM 844741108 9,433 951 11.21 342 24.00 0.0087
2023-04-28 2023-03-31 13F SOUTHWEST AIRLS COM 844741108 8,482 1,231 16.98 276 12.70 0.0075
2023-01-30 2022-12-31 13F SOUTHWEST AIRLS COM 844741108 7,251 -13,269 -64.66 244 -61.45 0.0071
2022-11-08 2022-09-30 13F SOUTHWEST AIRLS COM 844741108 20,520 11,892 137.83 633 102.88 0.0217
2022-08-10 2022-06-30 13F SOUTHWEST AIRLS COM 844741108 8,628 2,027 30.71 312 3.31 0.0106
2022-05-02 2022-03-31 13F SOUTHWEST AIRLS COM 844741108 6,601 -1,195 -15.33 302 -9.58 0.0091
2022-01-25 2021-12-31 13F SOUTHWEST AIRLS COM 844741108 7,796 -1,338 -14.65 334 -28.94 0.0103
2021-10-28 2021-09-30 13F SOUTHWEST AIRLS COM 844741108 9,134 809 9.72 470 6.33 0.0162
2021-07-26 2021-06-30 13F SOUTHWEST AIRLS COM 844741108 8,325 877 11.77 442 -2.86 0.0176
2021-04-30 2021-03-31 13F SOUTHWEST AIRLS COM 844741108 7,448 1,688 29.31 455 69.78 0.0201
2021-02-11 2020-12-31 13F SOUTHWEST AIRLS COM 844741108 5,760 -810 -12.33 268 8.94 0.0126
2020-11-03 2020-09-30 13F SOUTHWEST AIRLS COM 844741108 6,570 4,004 156.04 246 179.55 0.0132
2020-07-30 2020-06-30 13F SOUTHWEST AIRLS COM 844741108 2,566 -281 -9.87 88 -12.87 0.0053
2020-04-23 2020-03-31 13F SOUTHWEST AIRLS COM 844741108 2,847 332 13.20 101 -25.74 0.0087
2020-02-05 2019-12-31 13F SOUTHWEST AIRLS COM 844741108 2,515 27 1.09 136 1.49 0.0100
2019-10-16 2019-09-30 13F SOUTHWEST AIRLS COM 844741108 2,488 26 1.06 134 7.20 0.0110
2019-07-31 2019-06-30 13F SOUTHWEST AIRLS COM 844741108 2,462 -23 -0.93 125 -3.10 0.0108
2019-05-09 2019-03-31 13F SOUTHWEST AIRLS COM 844741108 2,485 7 0.28 129 12.17 0.0110
2019-02-13 2018-12-31 13F SOUTHWEST AIRLS COM 844741108 2,478 -49 -1.94 115 -27.22 0.0107
2018-11-14 2018-09-30 13F SOUTHWEST AIRLS COM 844741108 2,527 19 0.76 158 23.44 0.0161
2018-08-14 2018-06-30 13F SOUTHWEST AIRLS COM 844741108 2,508 295 13.33 128 0.79 0.0143
2018-05-08 2018-03-31 13F SOUTHWEST AIRLS COM 844741108 2,213 -5,024 -69.42 127 -73.21 0.0149
2018-02-13 2017-12-31 13F SOUTHWEST AIRLS COM 844741108 7,237 7,237 227.02 474 273.23 0.0571
2017-02-14 2016-12-31 13F SOUTHWEST AIRLS COM 844741108 0 -1,838 -100.00 0 -100.00
2016-11-14 2016-09-30 13F SOUTHWEST AIRLS COM 844741108 1,838 324 21.40 71 20.34 0.0104
2016-07-29 2016-06-30 13F SOUTHWEST AIRLS COM 844741108 1,514 -225 -12.94 59 -24.36 0.0086
2016-05-12 2016-03-31 13F SOUTHWEST AIRLS COM 844741108 1,739 632 57.09 78 62.50 0.0133
2016-01-22 2015-12-31 13F SOUTHWEST AIRLS COM 844741108 1,107 -249 -18.36 48 -7.69 0.0093
2015-10-23 2015-09-30 13F SOUTHWEST AIRLS COM 844741108 1,356 390 40.37 52 62.50 0.0119
2015-07-15 2015-06-30 13F SOUTHWEST AIRLS COM 844741108 966 0 0.00 32 -25.58 0.0069
2015-04-15 2015-03-31 13F SOUTHWEST AIRLS COM 844741108 966 0 0.00 43 4.88 0.0104
2015-02-13 2014-12-31 13F SOUTHWEST AIRLS COM 844741108 966 963 32,100.00 41 -4.65 0.0102
2014-11-13 2014-09-30 13F SOUTHWEST AIRLS COM 844741108 3 -295 -98.99 0 -100.00
2014-08-14 2014-06-30 13F SOUTHWEST AIRLS COM 844741108 298 295 9,833.33 8 0.0028
2014-05-16 2014-03-31 13F SOUTHWEST AIRLS COM 844741108 3 -281 -98.94 0 -100.00
2014-02-11 2013-12-31 13F SOUTHWEST AIRLS COM 844741108 284 0 0.00 5 25.00 0.0018
2013-11-13 2013-09-30 13F SOUTHWEST AIRLS COM 844741108 284 281 9,366.67 4 -20.00 0.0017
2013-08-14 2013-06-30 13F SOUTHWEST AIRLS COM 844741108 3 3 0 0.0000
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
(%)
2021-07-26 2021-06-30 13F SOUTHWEST AIRLS COM Call 0 -100.00 0 n/a n/a n/a
2021-04-30 2021-03-31 13F SOUTHWEST AIRLS COM Call 200 0 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.