Actually, Lexmark started some 20-odd years ago as a spinoff of IBM which pondered getting rid of its consumer ink-jet division. Many of that division's executives and engineers left on an early-retirement pay-out, funded Lexmark in Lexington, KY and that's how it started. The association with IBM Corp, after that, was based on a few contracts to mutual customers (IBM main-mid-miniframe systems using ink-jets and consumer lasers), and the ex-IBM'ers getting their monthly pension checks.
After a few years, few in IBM hallways had any relationships or memories with the ex-IBM'ers, and Lexmark was expanding so rapidly that their employee base far outstripped the few ex-IBM'ers.
They did keep one engineering design - the need for service personnel, like Epson, Canon and all the other printers that require print-head cleaning instead of an HP-esque design which sells a more expensive cartridge that includes a brand-new printhead each time.