Deputy Speaker Benjamin Kalu read their defection notices during plenary on Tuesday.
The Peoples Democratic Party (PDP) has lost three members of the House of Representatives from Kaduna State to the All Progressives Congress (APC).
The names of the lawmakers are Aliyu Abdullahi (Ikara/Kubau Federal Constituency) and Abdulkareem Ahmed (Kaduna South Federal Constituency).
Also, Sadiq Abdullahi, who represents Sabon Gari Federal Constituency, has formally joined the APC.
Deputy Speaker Benjamin Kalu read their defection notices during plenary on Tuesday.
The development came on the same day Governor Peter Mbah of Enugu State defected to the APC along with some top politicians in the state.