The company could buy Transdev’s 66% stake in the Corsican operator.
"Our proposal for SNCM seems well accepted by Transdev and was presented to the government," the company told Reuters.
Transdev called the bidder a “serious candidate.”
Siem had been in talks about a possible takeover, but pulled out earlier this month.
A new buyer will have to find a solution to the European Union’s demand for EUR 440m ($605.5m)