Sinha runs SIS (Security and Intelligence Services India Ltd.), one of the biggest private security agencies in the country. He has assets worth Rs.564 crore and his wife assets' are Rs.230 crore, say his nomination papers.
On Monday, he filed nomination papers for the biennial elections to the Rajya Sabha from Bihar to be held Feb 7, officials said.
R.K. Sinha has declared his and his wife's assets worth around Rs 800 crore.
Senior BJP leader C.P. Thakur is another nominee of the party for the elections to Rajyasabha. Thakur is a sitting Rajya Sabha member, and also the BJP's national vice president.
Last week, the party re-nominated Thakur, and named R.K. Sinha - who worked with former party chief Nitin Gadkari in the Delhi assembly polls - as another candidate for the Rajya Sabha which has five seats from the state up for elections this time.
Sinha is also not a new face in the saffron party in the state. His name cropped up a few years ago for the upper house of parliament, but he was not nominated because of caste equations in state politics being then unfavourable.