Grupo Aeroportuario del Sureste, S. A. B. de C. V. (ASR) Cash Flow Statement

The 2025Q3 collapse to 0.11x — where $2.1B of net income produced just $230.3M of operating cash flow — contrasts sharply with 2026Q3's $7.8B OCF on only $2.1B of net income. This pattern, where net income has been declining from $3.7B to $2.1B per quarter while operating cash flow has become more erratic, appears to reflect non-operating working capital movements and potentially IFRIC 12 construction accounting rather than a clean operational improvement. The 2026Q3 surge to 3.68x partly reflects a favorable working capital swing of $468.4M, though this alone does not fully account for the magnitude of the outperformance, warranting further investigation into the cash flow bridge.

The FCF margin swing from -14.2% in 2025Q4 to 76.2% in 2026Q3 represents a $9.4B swing in three quarters, driven primarily by episodic capital expenditure and acquisition timing rather than shifts in underlying operating economics. The two quarters reporting $0 FCF in 2026Q1 and 2026Q2 likely represent data unavailable rather than true zero, which would further distort any extrapolation attempt. For an analyst modeling forward FCF, the extreme variability in capex deployment — from $99.6M in 2025Q3 to $3.9B in 2025Q4 — means that no single-quarter snapshot offers a reliable annualized run rate.

The D&A base has expanded 64% from $566.9M in 2024Q2 to $928.6M in 2026Q3, confirming rapid asset base growth, yet corresponding capex has been deployed inconsistently across quarters. This episodic pattern makes it difficult to cleanly separate maintenance capex from growth capex using quarterly data alone, obscuring whether recurring infrastructure reinvestment needs are being fully met. Given that concession agreements typically mandate specific investment thresholds under the MDP, the near-absence of capex in certain quarters may reflect timing shifts within the development cycle rather than reduced long-term capital requirements.

The $16.8B acquisition in 2026Q3 represents a transformational capital commitment that appears to dwarf any prior transaction in the dataset and may fundamentally reshape future cash flow generation profiles if integration proceeds as modeled. Dividend payments are irregularly timed — clustering in Q2 and Q4 — but have averaged approximately $3.8B per quarter when paid, representing a significant and persistent claim on operating cash flow. The complete absence of share repurchases across all ten quarters indicates management is prioritizing cash distributions and growth-by-acquisition over per-share accretion, a strategy that warrants monitoring for sustainability given the accelerating pace of capital deployment.

The aggregate OCF-to-NI ratio of 1.25x suggests healthy cumulative cash conversion, but this smoothing effect obscures what appear to be two distinct cash generation regimes: the earlier quarters (2024Q2 through 2025Q1) show a tight and predictable NI-to-OCF relationship ranging from 0.95x to 1.31x, while the later quarters (2025Q3 onward) exhibit violent swings. This structural shift in cash flow behavior may reflect the cash flow consequences of major acquisitions, changes in construction accounting under IFRIC 12, or both, suggesting that the acquisition-driven expansion is introducing cash flow volatility not present in the legacy Mexican airport portfolio alone.