Mainsail Partners, a San Francisco-based PE firm, has promoted Lars Ahlstrom to operating partner. He will also retain his title as chief financial officer of the firm. Mr. Ahlstrom oversees the finance function of the organization, provides strategic financial advice and leadership, supports the firm's investment team and leads financial/accounting due diligence in the evaluation of new opportunities. He also serves as the firm's chief compliance officer. He joined Mainsail as CFO in 2006 after working with Golden Gate Capital and Storm Ventures.