Southwest Airlines Co.
MX ˙ BMV ˙ US8447411088
SecurityMX:LUV / Southwest Airlines Co.
InstitutionMercer Global Advisors Inc /adv
Latest Disclosed Ownership70,122 shares
Latest Disclosed Value $ 2,634,497
Mercer Global Advisors Inc /adv reports 16.05% increase in ownership of LUV / Southwest Airlines Co.

On May 15, 2026 - Mercer Global Advisors Inc /adv filed a 13F-HR form disclosing ownership of 70,122 shares of Southwest Airlines Co. (MX:LUV) valued at $2,634,497 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 17, 2026 disclosing 60,423 shares of Southwest Airlines Co.. This represents a change in shares of 16.05% 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 70,122 9,699 16.05 2,634 5.44 0.0039
2026-02-17 2025-12-31 13F SOUTHWEST AIRLS COM 844741108 60,423 4,502 8.05 2,498 40.02 0.0038
2025-11-14 2025-09-30 13F SOUTHWEST AIRLS COM 844741108 55,921 632 1.14 1,784 -0.50 0.0030
2025-08-14 2025-06-30 13F SOUTHWEST AIRLS COM 844741108 55,289 5,367 10.75 1,794 6.98 0.0037
2025-05-15 2025-03-31 13F SOUTHWEST AIRLS COM 844741108 49,922 1,093 2.24 1,676 2.13 0.0038
2025-02-14 2024-12-31 13F SOUTHWEST AIRLS COM 844741108 48,829 2,623 5.68 1,642 18.91 0.0040
2024-11-14 2024-09-30 13F SOUTHWEST AIRLS COM 844741108 46,206 3,947 9.34 1,380 14.14 0.0032
2024-08-12 2024-06-30 13F SOUTHWEST AIRLS COM 844741108 42,259 -14,925 -26.10 1,209 120,800.00 0.0033
2024-05-15 2024-03-31 13F SOUTHWEST AIRLS COM 844741108 57,184 3,353 6.23 2 0.00 0.0047
2024-02-15 2023-12-31 13F SOUTHWEST AIRLS COM 844741108 53,831 10,351 23.81 2 0.00 0.0047
2023-11-15 2023-09-30 13F/A-1 SOUTHWEST AIRLS COM 844741108 43,480 -3,646 -7.74 1 0.00 0.0045
2023-11-14 2023-09-30 13F SOUTHWEST AIRLS COM 844741108 43,480 -3,646 1 0.0045
2023-08-14 2023-06-30 13F SOUTHWEST AIRLS COM 844741108 47,126 3,386 7.74 2 0.00 0.0068
2023-05-16 2023-03-31 13F SOUTHWEST AIRLS COM 844741108 43,740 9,678 28.41 1 0.00 0.0065
2023-02-09 2022-12-31 13F SOUTHWEST AIRLS COM 844741108 34,062 -1,894 -5.27 1 -99.91 0.0057
2022-11-15 2022-09-30 13F SOUTHWEST AIRLS COM 844741108 35,956 -1,008 -2.73 1,109 -16.93 0.0066
2022-08-10 2022-06-30 13F SOUTHWEST AIRLS COM 844741108 36,964 -4,650 -11.17 1,335 -29.96 0.0082
2022-05-10 2022-03-31 13F SOUTHWEST AIRLS COM 844741108 41,614 -27,698 -39.96 1,906 -35.80 0.0112
2022-02-04 2021-12-31 13F SOUTHWEST AIRLS COM 844741108 69,312 2,396 3.58 2,969 -13.72 0.0183
2021-11-10 2021-09-30 13F SOUTHWEST AIRLS COM 844741108 66,916 7,611 12.83 3,441 9.27 0.0240
2021-08-10 2021-06-30 13F SOUTHWEST AIRLS COM 844741108 59,305 10,364 21.18 3,149 5.35 0.0242
2021-08-10 2021-03-31 13F/A-1 SOUTHWEST AIRLS COM 844741108 48,941 26,895 121.99 2,989 190.76 0.0272
2021-05-11 2021-03-31 13F SOUTHWEST AIRLS COM 844741108 48,911 26,865 2,987 0.0286
2021-02-12 2020-12-31 13F SOUTHWEST AIRLS COM 844741108 22,046 -2,250 -9.26 1,028 12.84 0.0128
2020-12-10 2020-09-30 13F SOUTHWEST AIRLS COM 844741108 24,296 -980 -3.88 911 5.44 0.0137
2020-08-10 2020-06-30 13F SOUTHWEST AIRLS COM 844741108 25,276 1,504 6.33 864 2.01 0.0157
2020-05-18 2020-03-31 13F SOUTHWEST AIRLS COM 844741108 23,772 1,346 6.00 847 -30.06 0.0186
2020-02-13 2019-12-31 13F SOUTHWEST AIRLS CO COM COM 844741108 22,426 -734 -3.17 1,211 -3.12 0.0242
2019-11-12 2019-09-30 13F SOUTHWEST AIRLS CO COM COM 844741108 23,160 -11,951 -34.04 1,250 -29.89 0.0294
2019-08-14 2019-06-30 13F SOUTHWEST AIRLS CO COM COM 844741108 35,111 -3,034 -7.95 1,783 -9.95 0.0473
2019-04-23 2019-03-31 13F/A-1 SOUTHWEST AIRLS CO COM COM 844741108 38,145 38,145 1,980 0.0712
2019-04-12 2019-03-31 13F SOUTHWEST AIRLS CO COM COM 844741108 20,430 950 0.0506
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.