Subway is a privately held company and does not disclose audited financials publicly. However, industry estimates, franchise disclosure documents (FDDs), and the 2023 Roark Capital acquisition process have generated a reasonably coherent financial picture that analysts and industry observers treat as directionally reliable. At its peak around 2012–2015, Subway's global system sales were estimated at approximately $18–20 billion annually. This figure represents the aggregate revenue flowing through all franchise locations — not Subway's own revenue, which would be the royalties and fees extracted from that system. At an 8% royalty rate on $18 billion in system sales, Subway's royalty income alone would approximate $1.4–1.5 billion annually, a figure that does not account for franchise fees, supply chain income, or advertising fund management. The 2016–2021 contraction period materially impacted system sales. Domestic same-store sales declined for multiple consecutive years, and the net closure of thousands of US locations reduced the domestic royalty base. Estimates suggest global system sales fell to approximately $14–16 billion during the trough years, with recovery accelerating after the 2021 menu refresh. The Roark Capital acquisition in 2023, reportedly valued at approximately $9.6 billion, implies a business generating substantial and stable cash flows — private equity acquirers of that profile typically target companies with EBITDA multiples in the 10–15x range, which would suggest Subway's normalized EBITDA in the range of $640 million to $960 million. These are estimates, not confirmed figures, but they are consistent with the asset-light franchise model's high-margin characteristics. Franchisee-level economics are more transparent through FDD disclosures. Average US Subway locations generate approximately $400,000–$500,000 in annual gross sales, below the QSR industry average and significantly below competitors like Chick-fil-A (which averages over $8 million per unit) or even McDonald's (approximately $3.5 million per unit). This per-unit productivity gap is central to franchisee profitability concerns and explains why Subway's aggressive unit-count growth strategy eventually became self-defeating — adding marginal locations cannibalized existing ones without proportionally growing the system. Post-refresh data has shown some improvement in per-unit volumes, with several markets reporting same-store sales growth in the low-to-mid single digits following the 2021 menu overhaul. International markets, particularly in Asia-Pacific and the Middle East, have shown stronger unit-level economics in some cases, reflecting less mature competitive environments and younger consumer bases.