[1]https://www.investopedia.com/terms/r/riskarbitrage.asp#:~:text=Risk%
   20arbitrage%20is%20an%20investment,acquirer%27s%20valuation%20of%20that
   %20stock.

References

   1. https://www.investopedia.com/terms/r/riskarbitrage.asp#:~:text=Risk arbitrage is an investment,acquirer's valuation of that stock