Last month, Gusto, a payroll and HR software company, announced that it agreed to acquire Guideline, a startup offering retirement plans to small and medium businesses. The terms of the deal weren’t disclosed, but Gusto paid approximately $600 million, according to a source familiar with the deal, although TechCrunch could not confirm how much of this was cash and how much was stock. Guideline was last valued at $1.15 billion in 2021 when it raised a $200 million Series D funding round. Since it...