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The coalition · diffuse-institutional dynamic + institutional thresholds

A diffuse-institutional and the Texas threshold math.

Bottom line. Southwest Airlines's ownership structure is unusual in the SB-29-era-mover cohort: the diffuse institutional shareholder base holds 24.86% economically and approximately 22% of voting power. Southwest Airlines is not a "controlled company" under NASDAQ Rule 5615(c) or under Texas SB 21's controlled-issuer definition, but the diffuse-institutional character is central to the post-SB-29 governance narrative. For Texas's elective opt-in thresholds (§21.552(a)(3) 3% derivative standing; §21.373 $1M shareholder-proposal threshold), the institutional-coalition arithmetic is reported below — pending the 13F-family ownership snapshot for Southwest Airlines as of the canonical pre-event date.

The diffuse-institutional dynamic

Ownership snapshot (S&P Capital IQ as of 2026-04-25)

  • N/A — diffuse institutional ownership — largest individual holder: 24.86% economic stake; approximately 22% of voting power. Controller type: founder / CEO.
  • Insiders aggregate: 24.95% (Southwest Airlines's filings disclose Musk and other officers/directors aggregated).
  • ≥5% individual holder list: N/A — diffuse institutional ownership (N/A%).
  • Is Southwest Airlines a "controlled company"? No — Musk's voting stake falls below the 50% threshold under NASDAQ Rule 5615(c) and Texas SB 21's controlled-issuer definition. The firm is founder-led with a controller-adjacent power structure that the post-SB-29 narrative treats as load-bearing.

The diffuse-institutional dynamic creates a power asymmetry standard event-study identification doesn't directly model: the marginal trader does not fully set price when a diffuse-institutional could credibly deliver a discontinuous corporate action (e.g., another redomiciliation, a take-private, a special dividend). The /stress_tests page documents how this asymmetry interacts with the Day-0 abnormal-return tests.

The institutional coalition — pending 13F snapshot

Pending verification — 13F-family ownership snapshot for Southwest Airlines

The coalition arithmetic below requires the canonical 13F-family ownership snapshot (S&P Capital IQ Public Ownership Detailed) as of Southwest Airlines's pre-event date. Pending that snapshot, the standard fields are shown with [DATA PENDING] placeholders.

Measure Southwest Airlines value
Total 13F-family filers in the universe[DATA PENDING]
Filers individually exceeding the §21.373 $1M threshold[DATA PENDING]
Two-holder combinations clearing the §21.552(a)(3) 3% derivative threshold[DATA PENDING]
Vanguard + BlackRock + State Street combined %[DATA PENDING]
Position-date breakdown[DATA PENDING]
Controller stake (Musk)24.86% (founder-CEO)

The "do thresholds matter for Southwest Airlines?" question

Two conditions independently matter: (1) has Southwest Airlines opted into SB 29 / SB 1057 thresholds (see /statutes)? (2) If Southwest Airlines has opted in, can the institutional coalition clear the thresholds? Both conditions resolve before the coalition-arithmetic argument carries weight. In the cross-firm cohort, the XOM canonical demonstrates the pattern: even where a firm opts into the 3% derivative threshold, the existing institutional shareholder base can clear it via two-holder coalitions. Southwest Airlines's coalition math will follow the same procedure once the 13F snapshot is pulled.

The diffuse-institutional dynamic complicates the coalition analysis in a way that XOM's diffuse-shareholder profile did not: Musk's ~22% voting power is not a coalition member; it is a counterweight to coalitions. The cross-firm placebo on /evidence reports how Southwest Airlines ranks among the 21-firm placebo distribution; the comparator is informative even before the per-firm event-study runs.

Primary sources

Ownership data

Full Bluebook-format citations in SOURCES.md.