Christopher Karlin of Associated Bank presented his thesis on Shift4 Payments (US: FOUR) at Best Ideas 2026.
Thesis summary:
Shift4 Payments is an integrated payment processor, a merchant acquirer that also supplies commerce software, strong in restaurants, hospitality, and sports and entertainment venues, with retail emerging. Founded by Jared Isaacman in 1999 at age 16, it counts 33% of U.S. table-service restaurants, 40% of hotels and 75% of pro sports stadiums as customers. Christopher sees a non-commoditized business: embedding payments in software raises switching costs, and the company has a record of identifying and controlling choke points.
The shares trade about 48% below their February 2025 high as the market lumps Shift4 with broken growth stories like Fiserv and Global Payments. Christopher argues M&A is a cheaper customer acquisition engine. Gateways earn 3-5 cents a transaction while processors earn 40-100 basis points, so buying gateways let Shift4 add merchants at about $3,000 each versus the $15,000 Toast spent, and conversion lifts gross profit four to five times. End-to-end volume grew tenfold, from $22bn in 2019 to $220bn in 2025.
Falling take rates, Christopher argues, reflect a deliberate migration toward enterprise customers, who pay less per transaction but bring far larger volumes and validate the product. In a fixed-cost business, growing payment volume drives operating margin expansion. Over five years, $2.8bn deployed across customer acquisition, R&D and deals produced $420m of incremental free cash flow, a 15% return. Payback on customer acquisition is under a year, and EBITDA per employee has doubled since 2018.
Management transition risk looks limited. Isaacman left to become NASA administrator but remains the largest shareholder at about 29%, his share conversion ends the dual-class structure, and he bought $16m of stock near $83 in August 2025. CEO Taylor Lauber helped build the M&A playbook, and CFO Christopher Cruz, formerly of pre-IPO partner Searchlight Capital, targets free cash flow per share. The $2.5bn Global Blue deal, with 80% share in VAT refunds, opens retail and international markets.
At about $64, Shift4 trades at 7x the $850m of run-rate free cash flow Christopher expects exiting 2027 (management’s $1bn target less $150m for stock compensation and M&A costs), a 14% yield, versus 8x 2027E FCF for Fiserv and 19x for Toast. A $1bn buyback is authorized. Net debt of 3.3x 2025E EBITDA could fall to about 1.8x by end-2027 on consensus FCF of $1.5bn over two years. Risks include leverage, softer merchant volumes and M&A execution.
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