You land in Madrid. The seatbelt sign pings off. You walk off the plane, past the duty free, past the café and the smell of fresh espresso, past the car rental desks, down to the parking garage, your bag pulling at your shoulder.

You never chose any of it. There was no other way out.

Every coffee you bought on that walk paid Aena a slice. In 2025, food and beverage rents alone brought Aena €1.10 for every passenger who walked through its Spanish airports. Car rental added another €0.80. Per person. Every person. 321.6 million of them last year 🐬

That walk is the whole thesis.

The Hohn thesis

I heard Chris Hohn of TCI describe airports this way: they are monopolies, and the market prices them like boring regulated utilities. But the shops, restaurants, car rental and parking inside are not price-capped. That part has real pricing power.

Hohn didn't just say it. TCI was the biggest foreign investor in Aena's IPO in February 2015, priced at €58 a share (€5.80 after the later 10-for-1 split). In a September 2025 letter to the board, TCI still called itself a core long-term shareholder with about 6% of the shares.

Today the stock trades around €25.54. That's over 4x the IPO price, before dividends.

So the question for you and me is not "was Hohn right in 2015". He was. The question is: is the market still missing it today?

Let's test it with real numbers. (Ten-second version: great bridge, full price, I'd buy around €19.)

What Aena actually is

Aena runs 46 airports and two heliports in Spain. It also owns 51% of London Luton, 51% of the holding behind Leeds Bradford (plus 49% of Newcastle), 17 airports in Brazil, and since March 2026 the concession for Rio de Janeiro-Galeão until 2039.

The Spanish state owns 51% through ENAIRE. Keep that number in mind. It matters later.

In 2025 the group made €6,379 million of revenue, €3,785 million of EBITDA and €2,137 million of net profit. 384.8 million passengers moved through its airports.

The test: two businesses under one roof

Spain runs a "dual till" since Law 18/2014. The regulator sets airport charges on the aeronautical business only. Commercial income stays outside the till. That's the legal core of Hohn's idea.

Here is what that split looked like in 2025, from Aena's own segment data:

| Segment | Revenue | EBITDA | EBITDA margin | EBITDA growth | |---|---|---|---|---| | Aeronautical (regulated) | €3,347M | €1,655M | 49.4% | +2.8% | | Commercial (uncapped) | €1,975M | €1,648M | 83.4% | +11.1% | | Real estate | €132M | €102M | 77.4% | +8.5% | | International | €914M | €383M | 41.9% | +17.3% |

Read that table slowly 🐯

Commercial is 31% of revenue. But it's 43.5% of EBITDA, the same size as the regulated business. It earns 83 cents of EBITDA on every euro. And it grew four times faster.

Inside commercial, the lines tell the story. Car rental rose 25.6% to €261M. VIP lounges and fast track jumped 31% to €205M. Parking rose 8.7% to €222M. Duty free, the biggest line at €535M, grew only 1.5%.

Now the contracts. Most shops pay a Minimum Annual Guarantee (MAG), a fixed floor rent, or a share of sales, whichever is higher. Aena has €1,283M of MAG and fixed rents locked in for 2026. When contracts get re-tendered, the floors reset. New food and beverage tenders came in 19% above the old MAG in 2025. New specialty retail tenders came in at 140% of the old MAG.

That is pricing power. Hohn is right on this part.

The momentum held in 2026. In the first half, commercial revenue rose 6.7% to €991M on traffic up only 3.7% in Spain. New F&B contracts lift MAG 37% by 2028 versus 2025. Specialty shops, 83%.

Now the regulated side. On 15 September 2026, the Spanish government approved DORA III, the airport rules for 2027 to 2031. Aena had asked for tariffs to rise 3.82% a year. The competition regulator CNMC recommended a cut of 0.59% a year. The government landed on +0.33% a year. About three cents per passenger.

With inflation anywhere near 2%, that is a real cut. For five years. That's the bitter part of the thesis.

Two sweeteners came with it. The allowed return (WACC) moved to 8.32%, up from 6.02% in the last period, according to Aena's investor update. And Aena gets to invest nearly €13 billion between 2027 and 2031, €9,991M of it regulated. That's capacity at Madrid, Barcelona, Málaga, the islands.

So the toll on the plane is capped and barely moves. The toll on the walk to the car park keeps resetting up. Two businesses. One roof 🌴

The Mauboussin lens: what does the price expect?

A great business isn't automatically a great stock. So the first question is: what does €25.54 already assume?

ROIC. 2025 EBIT was €2,988M. After Aena's 23.6% effective tax rate in 2025, NOPAT was about €2,283M. Average operating capital (airports, intangibles, working capital) was about €14.2B. That's a ROIC of 16.0%. It's a margin story: 36% NOPAT margin, but only 0.45x capital turnover. Airports are heavy. The return comes from pricing, not from speed.

ROIIC. This is where it gets odd. From 2022 to 2025, NOPAT (at a flat 25% tax) went from about €960M to €2,200M while invested capital barely moved (€13.5B to €14.4B). The math prints an incremental return of over 200%. Sounds wonderful. It's meaningless. It's a COVID recovery, plus tariffs and rents on old assets. Growth came from pricing and traffic, not new capital.

The next five years are different. €10B of regulated capex earns the regulated return: 8.32% (the regulator's pre-tax WACC), roughly 6.2% after tax. Add about €3B of commercial capex at maybe 20% (my estimate). Blended, I get roughly 9.5% on new money. Close to the cost of capital. Mauboussin calls this the treadmill: you invest a lot to grow, and the growth adds almost no value.

What the price implies. I use an 8% cost of capital. At that rate, Aena with zero growth is worth NOPAT / 8%. On my 2026 NOPAT estimate of about €2,400M (H1 extrapolated by last year's seasonality, an estimate), that's €30B. The enterprise value is €45B (€38.3B market cap plus €6.7B net debt).

So 67% of the price is the bridge as it stands. 33% is the price of future value creation.

Then I ran the reverse DCF (working backwards from the price to what it must assume). With a 9.5% return on new investment, and the advantage wearing off at the average speed for industrial companies, the value never reaches today's price. Not in 60 years. For the price to make sense, you need one of two things:

1. A bond-like discount rate of about 6.5%. Then the price implies about 21 years of advantage.
2. Or returns on new investment of 20 to 30% for 26 to 40 years. That's the commercial engine running at full speed for a generation.

That's the answer to Hohn's thesis. The market does NOT price Aena like a boring utility. At about 18.8x NOPAT, it already pays a premium for the commercial engine.

Base rate. 5% nominal growth (about 3% real) is right at the median for companies with $7-12B of sales. Plausible. Not special.

Capital allocation. Aena pays out 80% of profit. The 2025 dividend was €1.09 a share, up 11.7%, a 4.3% yield today. It adds bolt-on airports abroad (Galeão for R$2.9B, about €491M; 51% of Leeds Bradford/Newcastle for €340M). Sensible deals, modest size. But net debt rose to €6,724M, 1.73x EBITDA, from 1.46x at year end. And capex is about to jump from €1.06B paid in 2025 to roughly €2.6B a year. I'd grade it a B.

Edge. At €25.54, I don't have one. Everyone can read this segment table. The only edge I can see is behavioral: a traffic scare or a regulatory headline that pushes the price down hard.

The Toll Bridge lens: 7 questions

| # | Question | Score | Why | |---|---|---|---| | Q1 | Destination | 2 | Spain's tourism, and the islands have no road | | Q2 | Traffic | 1 | DORA III sees 321M to 358M passengers by 2031, ~1.8% a year | | Q3 | No bypass | 2 | A national network monopoly. Rail only competes on domestic routes | | Q4 | Toll power | 1 | Aero: +0.33%/yr, a real cut. Commercial: new MAGs at 119% to 140% of the old floors | | Q5 | Cheap to run | 1 | 83% commercial margin, but ~€13B capex coming | | Q6 | Government | 0 | The state owns 51% and sets the tariff | | Q7 | Owners paid | 2 | 80% payout, dividend up 11.7% |

Score: 9/14. STRONG TOLL, with a GOV RISK flag. I had it at 11 earlier this month. DORA III dropped traffic and running costs one point each.

Q6 deserves one more line. The commercial till is "uncapped" until it isn't. In 2021 the Spanish parliament passed Act 13/2021, which cut the minimum rents of shops and restaurants in proportion to traffic lost to COVID. Aena estimated about €1.3B less rent over those contracts' lives. The state reached into the uncapped till once. It can do it again.

Risks

• Traffic. In H1 2026 Aena itself warned of weaker load factors and limited visibility, as airline fuel hedges expire with the Middle East conflict ongoing. Part of the 2026 growth is temporary diversion to "safe" Spain.
• The state. A 51% owner that also writes the tariff. It wants dividends today. It may want lower charges for airlines tomorrow.
• Capex. €13B in five years is a lot of concrete. Cost overruns earn nothing extra.
• Luton. The concession ends in 2032 and a new licence process is coming.

Catalysts

• Q3 results on 28 October 2026: H2 traffic and commercial per passenger.
• Re-tenders of duty free and F&B contracts, where MAG resets land.
• The first DORA III tariff in 2027.

Five scenarios

I use the same formula as my watchlist: return per year = (1 + growth) x (exit multiple / entry multiple)^(1/5) - 1 + dividend yield. Entry is 18.8x NOPAT.

| Scenario | Probability | NOPAT growth | Exit multiple | Dividend | 5-yr price | Return/yr | |---|---|---|---|---|---|---| | Super Bull | 5% | 8.0% | 22x | 4.3% | ~€44 | 15.8% | | Bull | 20% | 6.5% | 19x | 4.3% | ~€35 | 11.1% | | Base Case | 45% | 5.0% | 16x | 4.3% | ~€28 | 6.0% | | Bear | 20% | 3.0% | 14x | 4.0% | ~€22 | 1.1% | | Super Bear | 10% | 0.0% | 12x | 3.5% | ~€16 | -5.1% |

Probability-weighted expected return: about 5.4% a year.

My hurdle for the Compounding Portfolio is 12%. Aena doesn't clear it.

Verdict

Hohn's thesis holds on the business. The commercial engine is real: 83% margins, 43.5% of EBITDA, rents that reset up at every tender.

It fails on the price. The market saw the same table I did. At 18.8x NOPAT, it already pays for the commercial engine, and the regulated half just got five years of real tariff cuts. Chew on that.

What would make me act? A price that clears 12% in my base case. That's about €19 a share, roughly 25% below today (the 52-week low was €21.96). At €19, I'd also be paid for the government risk instead of just carrying it.

Hohn's line was that the market files airports under boring utilities. You now know what the price already assumes.

And you don't have to decide today. I don't own Aena today. It stays on my watchlist with a price alert at €19, and the alert does the waiting 🐬

The founder's version of this lesson

Look at why the two tolls behave so differently. On the plane, someone else sets Aena's price. On the walk to the car park, the payer has no other way out, and the price resets up at every tender.

Your business has the same two tolls. If your buyer never puts a number on what the problem costs them, someone else sets your price (the competitor, the procurement team, the discount). When the cost of doing nothing is on the table before your price is, you're the one who resets it 🐯

This is my own process, shared openly. Not investment advice.

Want the same process for your business? Every week in Sprint Club we turn the same probabilistic thinking into decisions you can act on. Join here: https://www.strategysprints.com

Ready to accelerate now? Book a Discovery Call: https://calendly.com/strategysprint/discovery-call

Happy hunting.

Simon & The Sprinters 🐬⚡️🐆

Sources: Aena Results Presentation full year 2025 (25 Feb 2026); Aena H1 2026 results press release (29 Jul 2026); Moodie Davitt Report on Aena H1 2026 commercial results; Vozpópuli (15 Sep 2026) and Quartr summary of Aena's DORA III investor update (Sep 2026); Aena DORA III proposal (Feb 2026); CNMC summary of Law 18/2014; Act 13/2021 MAG provision as reported by Moodie Davitt and Aena (2021); Euromoney and Law360 on the 2015 IPO; TCI letter to the Aena board (Sep 2025) as reported; Thecorner.eu on Luton; stockanalysis.com balance sheet history 2021-2025; Yahoo Finance price (16 Oct 2026); Mauboussin ROIC Lens and Toll Bridge Lens (Strategy Sprints).