Rimini Street, Inc. filed a Form 8-K on August 12, 2026, disclosing the appointment of Keith C. Costello, age 60, as Executive Vice President and Chief Operating Officer, effective August 17, 2026.

Key Highlights

  • New COO appointed: Keith C. Costello, age 60, was appointed Executive Vice President and Chief Operating Officer by the Board of Directors on August 8, 2026, effective August 17, 2026.
  • Annual base salary: Costello's annual base salary is $460,000, prorated for the 2026 calendar year from his August 17, 2026 start date.
  • Incentive compensation target: His target annual incentive compensation opportunity is 81.74% of his annual salary, based on 100% attainment of all objectives, also prorated for 2026.
  • Onboarding equity awards: Costello will receive a stock option award for 150,000 shares and an RSU award for 150,000 shares, each vesting in equal installments on the first, second, and third anniversaries of the August 17, 2026 grant date.
  • Prior role: Most recently, Costello served as President, Enterprise Applications, Technology, Consulting and Engineering Services at DXC Technology from October 2025 until August 2026.
  • Severance terms: If terminated without Cause or for Good Reason before a Change of Control, Costello is entitled to continued base salary, 12 months of target annual incentive compensation, and 12 months of COBRA premium coverage.

Rimini Street Board Appoints Technology Veteran Keith Costello as COO

According to the filing, the Board of Directors of Rimini Street, Inc. (NASDAQ:RMNI) approved the appointment of Keith C. Costello as Executive Vice President and Chief Operating Officer on August 8, 2026, with an effective date of August 17, 2026. In this role, the filing states, Costello "will function as the Company's principal operating officer." The filing describes Costello as having "more than 30 years of experience in building and scaling go-to-market, global services and customer success organizations."

The filing details Costello's recent career history. At DXC Technology, he served as Global Managing Director and Senior Vice President, Applications, from December 2023 until October 2025, and then as President, Enterprise Applications, Technology, Consulting and Engineering Services from October 2025 until August 2026. Before DXC, he held roles at IBM from 2017 until 2023, most recently as General Manager, Global SAP Business from December 2020 until April 2023, where he led a worldwide team of over 35,000 professionals. Notably, the filing also discloses that in 2016, prior to joining IBM, Costello previously held the role of Senior Vice President, Global Client Engagement at Rimini Street itself.

Under the Offer Letter dated August 5, 2026, Costello's LTI Plan participation begins in 2027, with the total grant date value at target set at fifty percent of the Chief Executive Officer's LTI Plan total grant date value at target, as determined by the Board or a committee thereof. The stock options granted will be exercisable at the fair market value of the company's common stock on the grant date, based on the closing price on the Nasdaq Global Market on that date. In the event of a Change of Control followed by termination without Cause or for Good Reason within 24 months, the filing states that 100% of Costello's then-outstanding unvested equity awards would vest.

What Was Disclosed

Rimini Street disclosed the appointment of Keith C. Costello as Executive Vice President and COO, along with the material terms of his Offer Letter, including base salary, incentive compensation target, onboarding equity awards, and severance provisions, via a Form 8-K filed August 12, 2026.