** Piper Sandler downgrades specialty insurer Aspen Insurance AHL.N to "neutral" from "overweight"

** Brokerage cites acquisition by Japan's Sompo for $37.50 per share as limiting factor for upside for investors

** Piper Sandler also reported lower net premiums written in third quarter of $705.2 million, below consensus estimates of $725.1 million

** Brokerage revises co's FY25 EPS estimate to $3.95 from $3.80, lowers estimate for FY26 EPS to $4.95 from $5.10

** One of 7 brokerages rate stock "buy" or higher, six "hold"; their median PT is $37.50 - data compiled by LSEG

** As of last close, AHL stock has risen 10.86% from opening price on debut in May

(Reporting by Anuj T in Bengaluru)

((anuj.t@thomsonreuters.com))