An Infrastructure Firm Buys Billboards

I Squared Capital is one of the largest infrastructure private equity firms in the world. It manages more than $60 billion and invests in things like natural gas storage facilities, data centers, transportation networks, and environmental waste platforms. Last week it agreed to buy Australia's largest outdoor advertising company for about A$898 million (roughly $570 million). The deal is expected to close in the fourth quarter.

I know what you're thinking. This sounds like a category error. An infrastructure firm buying billboards? But the reason it isn't is the point.

The basic idea is that out-of-home advertising — billboards, airport screens, transit wraps, street furniture — works exactly like infrastructure. You put physical assets on public land under long-term concession contracts. You collect a steady revenue stream from the right to display messages to people who can't look away. The assets are capital-intensive to deploy, geographically sticky, and produce durable cash flow from tolls on attention. If a toll road is infrastructure because you charge vehicles for the privilege of passing a concrete structure, then a digital billboard network is infrastructure because you charge brands for the privilege of passing a visual stimulus.

I Squared Capital's stated sectors are power, utilities, transportation, digital infrastructure, environmental services, and social infrastructure. Outdoor advertising doesn't appear on that list. But the firm also describes its thesis in functional terms: durable demand, essential services, physical platforms with operational resilience. A national network of 35,000 display assets, reaching over 99 percent of metropolitan Australians, underpinned by concession contracts with airports and transport authorities, is a platform that happens to sell ads instead of electricity.

The deal didn't come together on the first try. That's the part that looks like private equity rather than infrastructure, and it's worth walking through because the auction mechanics reveal how these valuations actually form.

oOh!media's shares fell to 85 cents in April 2026. The company had been posting solid numbers — A$691 million in revenue for 2025, up 9 percent, with adjusted EBITDA (earnings before interest, taxes, depreciation, and amortization, a rough proxy for operating cash flow) of A$328 million, both record highs. But the stock was down, which is the universal signal that says someone should probably bid on us. At that price the company was trading at roughly 1.3 times revenue or 2.7 times EBITDA — numbers that don't require any conviction in the advertising cycle, just an assumption that the concession contracts will keep rolling in money for a few years.

Pacific Equity Partners, Australia's largest private equity firm, made the first move in April with a non-binding offer of $1.40 per share, valuing the company at about A$747 million. oOh!media's board politely rejected it. I Squared Capital immediately followed with $1.45, and the board said that wasn't high enough either. This is standard process: the board's job in a contested auction is to play each bidder against the others, and the language is always the same. "The offer doesn't reflect the full value of the business." The subtext is bid higher.

By May, Oaktree Capital had entered the fray and had apparently built a sub-5 percent stake in the company, which gives you a hint about their incentives. Oaktree wasn't just shopping — they were positioned. A stake before the bid is a nice feature: it makes the bidder look committed, it softens the political optics of a hostile approach, and it means that if the board accepts someone else's offer, Oaktree's existing shares get bought out at the same premium. It's not exactly a free option, but it's an option where the downside is capped at the market value of a few percent stake.

Bain Capital also reportedly submitted a non-binding offer, though it didn't make it into the final rounds. By June, the three remaining bidders — PEP, I Squared, and Oaktree — had converged around $1.60 per share, valuing the company at roughly A$845 million. The company's advisers reportedly dismissed a floating figure of A$1 billion as unrealistic. A few weeks later, PEP withdrew after failing to get internal sign-off. I Squared won at A$898 million, which works out to about $1.70 per share — higher than the $1.60–$1.65 range the three bidders had confirmed in July but still below the A$1 billion that sources were quietly anchoring to.

So what did I Squared actually buy? A company that prints roughly A$328 million in annual EBITDA, at an equity price that works out to about 2.7 times that figure. In the old world of private equity, that is a number that screams for leverage. The company is paying off existing debt (it was carrying significant borrowings before the auction), and I Squared will presumably load it up again. The concession contracts — especially at airports — are the collateral. Those contracts are the part that makes this infrastructure-adjacent rather than pure media. If the contract with the airport expires or gets renegotiated, the cash flow changes. But as long as the concession rolls, the EBITDA is durable, and the debt service is covered.

I think the simplest model is this: I Squared is buying a toll collection business that happens to use digital screens instead of lane barriers. The revenue is contract-anchored rather than discretionary, the asset base is physical and defensible, and the multiple is low enough that leverage plus modest growth covers the cost of capital. That is the infrastructure thesis, just wearing a different label.

There are complications. The out-of-home advertising market is growing — U.S. OOH revenue hit a record $9.46 billion in 2025 — but it's also cyclical. Brands pull back ad spend in downturns, and Australia's retail advertising is a significant part of oOh!media's mix. The company itself warned in February about softer conditions in the retail sector. And concession contracts, while durable, are always subject to renewal risk. An airport authority that renegotiates terms mid-lease can reshape the economics overnight.

The valuation doesn't require these risks to go away. At 2.7 times EBITDA, the deal is priced for modest returns even without dramatic revenue growth. The upside comes from operating leverage (fixed costs, variable ad demand), rate increases on existing contracts, and the usual private equity playbook of cost discipline and margin expansion. The downside is the same: a broad advertising recession or a material contract loss that cuts through the assumed cash flow stream. That's why PEP walked — their internal bar for the price was higher than what the board was willing to accept, or their model for what they could extract was less optimistic than I Squared's.

The classification question is worth sitting with for a moment. I Squared Capital doesn't usually buy media companies. They buy assets with predictable cash flows tied to physical infrastructure and essential demand. By treating oOh!media as infrastructure rather than media, they're applying a lower multiple to a business that the public markets had briefly assigned a media-company discount. The stock fell to 85 cents not because the concession contracts deteriorated but because advertising sentiment soured. The infrastructure frame lets I Squared ignore the advertising cycle and price the company on the durability of the underlying physical network.

That's the move. Billboards are toll roads for attention. Concession contracts are the right-of-way. EBITDA is the toll collection. And a 2.7x multiple is just the price of leverage working in your favor.