IiAS, which supports removal of estranged Chairman Cyrus Mistry from Tata Group firms, "changed its voting recommendation on the resolution to remove Nusli Wadia from Tata Steel and Tata Motors - we support the resolution," it said in a report.
The change in recommendation follows the recent Rs 3000 crore defamation case filed by Nusli Wadia against the Tatas.
"Given this, we believe the relationship between Nusli Wadia and the Tatas has become antagonistic and will therefore likely be a distraction for the boards," it said.
IiAS had previously recommended that shareholders vote against the removal of Nusli Wadia as a director.
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"Given recent developments, IiAS now changes its voting recommendation to support the resolution - it is in the long-term interest of the Tata companies to remove Nusli Wadia as a director," it said.
Tata Sons accused Nusli Wadia of being disruptive and galvanizing other independent directors to act against the interests of the Tata group.
On why it supported non-removal of Wadia previously, IiAS
said the boards of the Tata companies are also silent on his conduct, but only reiterated his independence.
"By choosing to remain silent on Nusli Wadia and by continuing to list him as an independent director, we believed the board had tacitly signaled that it has not come to such a conclusion regarding his conduct," it said.
But as the situation continues to develop, it now believes that the relationship between Nusli Wadia and the Tata group has "deteriorated to the level of being antagonistic".
"Until now, Nusli Wadia's actions were in line with the campaign of a director who believes he has been wronged. But to file a lawsuit, and ask for damages will likely have permanent implications for both sides," it said.
"Therefore, we have changed our recommendation: we now recommend voting for the removal of Nusli Wadia from the boards of the operating companies," it said.
This is the first time IiAS has changed its voting recommendation based on developing events.
"IiAS continues to believe that allowing controlling shareholders to remove independent directors may set a wrong precedent," it said.
On its recommendation for removal of Cyrus Mistry as Director, IiAS said his position as a director of Tata Steel was a direct consequence of his position as Chairperson of Tata Sons.