While Navlakha and Babu are currently in jail under judicial custody, Bharadwaj is out on bail.
SentinelOne's findings on the link between hackers and cops in Pune stems from evidence that was excavated from devices belonging to two specific defendants - Rona Wilson and Varavara Rao.
The special court for National Investigation Agency (NIA) cases, while passing the release order, had directed that she shall not leave Mumbai without permission.
A bench comprising Justices U U Lalit and Ajay Rastogi dismissed as withdrawn the plea filed by Bharadwaj.
Justice A M Khanwilkar read out the verdict for himself and the CJI, while Justice D Y Chandrachud said he was unable to agree with the view of the two judges.
The five activists --Varavara Rao, Arun Ferreira, Vernon Gonsalves, Sudha Bharadwaj and Gautam Navlakha-- are under arrest at their respective homes since August 29.
The Maharashtra police had arrested the five activists on August 28 in connection with an FIR lodged following a conclave.
Reacting to this in a handwritten statement, Bharadwaj, who is under house arrest, Friday said the purported letter shown by the Pune Police is a mixture of innocuous.
Prominent people who signed the letter included economist Jean Dreze, Afzal Anees and Kavita Srivastava.
Bhima Koregaon case: Those speaking against human rights violation being targeted by present regime, says Sudha Bharadwaj
Bharadwaj has been confined at her residence in Faridabad, under the guard of police officers, and allowed to meet only her lawyer.
CPI-M on Tuesday condemned the arrests of various activists and journalists such as Sudha Bharadwaj, Varavara Rao and Gautam Navlakha.