Rod James and Adam Le
Landmark Partners is lined up to back the deal which involves pub chain Stonegate Pubs.
The buyout firm wants to move Swedish chemicals producer Perstorp into a continuation vehicle, Secondaries Investor has learned.
The firm is expecting to raise around $6.5bn for Dover Street X, including co-investment pockets and SMAs.
The deal is one of the largest LP portfolio transactions.
The firm's latest fund is seeking around $2bn more than the target of its predecessor in a year in which some of the biggest names in secondaries have returned to market.
The investment firm has previously offloaded portfolios from its first four ASF funds and first three AESF funds on the secondaries market.
The firm is understood to be seeking around $12bn for its latest flagship in a year when several large secondaries firms are expected return to market.
The German mid-market buyout firm has extended the life of its 2008-vintage fund by two years in a deal advised by Rede Partners.
The bank is understood to have paid €100m into the deal, which included a stake in Byron Hamburgers.
Details of the $55bn pension's secondaries sale, which includes at least 130 fund positions, were outlined in an RFP posted on its website.