The investment vehicle, which is backed by several major British fund firms including Aviva, Schroders and Jupiter Asset Management, said it would continue its dialogue with Barclays "for as long as it appears to be appropriate to do so".
The investor said it currently holds a 5.9% stake in the lender following recent stock purchases. The Barclays share price has fallen by around 36% in the six months to June 30.
($1 = 0.7642 pounds)
(This story corrects NAV percentage change in first paragraph.)
(Reporting By Sinead Cruise; editing by Simon Jessop)