(Adds details, analyst comments; updates share movement)
LONDON, May 20 (Reuters) - London-listed oil explorer Afren Plc reported first-quarter net production of 35,465 barrels of oil per day (bopd), lower than its target of 40,000 bopd this year.
Shares in the company fell as much as 6 percent in morning trade, making the stock the top percentage loser on the FTSE-250 Midcap Index.
"We see the results on the negative side," Oriel Securities analyst Dragan Trajkov said in a note to clients.
Afren, which is targeting double-digit production growth over the next five years, has its main assets in Nigeria, but it also operates in Kenya and Kurdistan.
The company also reported a 30 percent fall in first-quarter sales revenue due to a reduced share of production and liftings from its Ebok field in Nigeria and lower realised average oil prices.
Revenue from continuing operations fell to $269 million from $386 million a year earlier.
Average net production at Ebok - its main producing asset - fell to 25,971 bopd down from 33,513 bopd a year earlier.
The oil explorer and producer said analysis of 3D seismic data of its Ogo oil field - the world's third largest discovery of 2013 - would begin shortly.
"At first glance the (first-quarter) update appears to be in-line. However, factoring in the payments to field partners drives a reduction in our valuation, making the shares less attractive," Canaccord Genuity analysts said in a note and downgraded the stock to "hold" from "buy".
Shares in Afren were trading down 5 percent at 146.4 pence at 0910 GMT on the London Stock Exchange. (Reporting by Karolin Schaps and Roshni Menon; Editing by Gopakumar Warrier)