Parthenon Capital has agreed to sell portfolio company eSecLending, a global securities lending agent, to Capitolis in a transaction valued at $200 million. Capitolis is a financial technology company that helps banks and the buy side optimize their financial resources. As part of the deal, Parthenon Capital’s Fund IV is making a rollover investment in Capitolis.

Parthenon invested in eSecLending alongside securities lending industry veteran Craig Starble, who joined the company as chief executive at the time of the investment. Over the 13-year partnership, eSecLending added major clients and grew aggregate client on-loan balances more than six-fold.

“A 13-year partnership with one company is unusual in private equity,” said Brian Golson, managing partner and co-chief executive of Parthenon Capital. “It was that consistent, steady growth that fostered a unique and highly lucrative partnership for Parthenon and our investors.”

eSecLending is headquartered in Boston. It serves institutional investors including pension funds, insurance companies and asset managers, and works with major banks and prime brokers. After closing, eSecLending will keep its existing leadership team, employees and service model, led by Starble, and clients will retain their existing relationships.