Rongai MP Raymond Moi is among MPs listed as worst house performers.
Moi is among Members of Parliament listed by Mzalendo.com of being inactive in parliament.
The report released on Thursday was compiled from Hansard reports of the house.
According to Nation online, Mzalendo's report said that of the 27 MPs who did not contribute to plenary sessions in the Assembly, five have never given their maiden speech, meaning they have never ever spoken a word in the House.
"Although the number of speech counts in plenary discussions is not indicative of the quality of input, it could allude to low capacity to exercise their parliamentarian roles," said Ms Jessica Musila, Mzalendo Trust's executive director.
Moi could not be reached for comment.