Southwest Airlines Co.
MX ˙ BMV ˙ US8447411088
SecurityMX:LUV / Southwest Airlines Co.
InstitutionLMR Partners LLP
Latest Disclosed Ownership18,500 shares
Latest Disclosed Value $ 695,045
LMR Partners LLP ownership in LUV / Southwest Airlines Co.

On May 15, 2026 - LMR Partners LLP filed a 13F-HR form disclosing ownership of 18,500 shares of Southwest Airlines Co. (MX:LUV) valued at $695,045 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 17, 2026 disclosing 0 shares of Southwest Airlines Co..

LMR Partners LLP 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 25,000 of underlying shares valued at $939,250 USD and put options representing 75,000 of underlying shares valued at $2,817,750 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)
2026-05-15 2026-03-31 13F SOUTHWEST AIRLS COM 844741108 18,500 18,500 695 0.0015
2026-02-17 2025-12-31 13F SOUTHWEST AIRLS COM 844741108 0 -14,996 -100.00 0 -100.00
2025-11-14 2025-09-30 13F SOUTHWEST AIRLS COM 844741108 14,996 0 0.00 479 -1.65 0.0021
2025-08-14 2025-06-30 13F SOUTHWEST AIRLS COM 844741108 14,996 14,996 486 0.0035
2024-02-14 2023-12-31 13F SOUTHWEST AIRLS COM 844741108 0 -60,315 -100.00 0 -100.00
2023-11-14 2023-09-30 13F SOUTHWEST AIRLS COM 844741108 60,315 -375,303 -86.15 1,633 -89.65 0.0184
2023-08-14 2023-06-30 13F SOUTHWEST AIRLS COM 844741108 435,618 -8,804 -1.98 15,774 9.07 0.1751
2023-05-15 2023-03-31 13F SOUTHWEST AIRLS COM 844741108 444,422 -318,289 -41.73 14,461 -43.69 0.2241
2023-02-14 2022-12-31 13F SOUTHWEST AIRLS COM 844741108 762,711 -11,261 -1.45 25,680 7.59 0.4483
2022-11-14 2022-09-30 13F SOUTHWEST AIRLS COM 844741108 773,972 773,972 23,869 0.4390
2022-02-14 2021-12-31 13F SOUTHWEST AIRLINES COM 844741108 0 -22,147 -100.00 0 -100.00
2021-11-15 2021-09-30 13F SOUTHWEST AIRLINES COM 844741108 22,147 22,147 1,139 0.0128
2018-01-30 2017-12-31 13F SOUTHWEST AIRLINES COM 844741108 0 -209,485 -100.00 0 -100.00
2017-11-09 2017-09-30 13F SOUTHWEST AIRLINES COM 844741108 209,485 209,485 11,727 1.2694
2016-11-04 2016-09-30 13F/A-1 SOUTHWEST AIRLINES COM 844741108 0 -41,178 -100.00 0 -100.00
2016-11-04 2016-06-30 13F/A-1 SOUTHWEST AIRLINES COM 844741108 41,178 28,403 222.33 1,614 182.17 0.2500
2016-07-28 2016-06-30 13F SOUTHWEST AIRLINES COM 844741108 41,178 1,614
2016-05-04 2016-03-31 13F SOUTHWEST AIRLINES COM 844741108 12,775 5,397 73.15 572 80.44 0.0625
2016-02-03 2015-12-31 13F SOUTHWEST AIRLINES COM 844741108 7,378 -37,233 -83.46 317 -81.32 0.1032
2015-11-05 2015-09-30 13F SOUTHWEST AIRLINES COM 844741108 44,611 -55,832 -55.59 1,697 -48.95 0.1855
2015-08-10 2015-06-30 13F SOUTHWEST AIRLINES COM 844741108 100,443 -55,973 -35.78 3,324 -52.03 0.4062
2015-04-20 2015-03-31 13F SOUTHWEST AIRLINES COM 844741108 156,416 -6,704 -4.11 6,929 0.36 0.9581
2015-01-20 2014-12-31 13F SOUTHWEST AIRLINES COM 844741108 163,120 154,343 1,758.49 6,904 2,232.43 0.9023
2014-10-20 2014-09-30 13F SOUTHWEST AIRLINES COM 844741108 8,777 -433,107 -98.01 296 -97.51 0.0236
2014-07-10 2014-06-30 13F SOUTHWEST AIRLINES COM 844741108 441,884 441,884 11,870 0.9872
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
(%)
2026-05-15 2026-03-31 13F SOUTHWEST AIRLS COM Call 25,000 939 n/a n/a n/a
2024-02-14 2023-12-31 13F SOUTHWEST AIRLS COM Call 0 -100.00 0 -100.00 n/a n/a n/a
2023-11-14 2023-09-30 13F SOUTHWEST AIRLS COM Call 500,000 0.00 13,535 -25.24 n/a n/a n/a
2023-08-14 2023-06-30 13F SOUTHWEST AIRLS COM Call 500,000 18,105 n/a n/a n/a
Disclosed Put 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
(%)
2026-05-15 2026-03-31 13F SOUTHWEST AIRLS COM Put 75,000 2,818 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.