This auction attracted as many as 91 initial bids, with the world’s biggest firms all putting their hat in the ring.

This auction attracted as many as 91 initial bids, with the world’s biggest firms all putting their hat in the ring.

throw hat in the ring : 출전의사를 밝히다.(복싱에서 유래)

with something doing : something 과 함께 --> do 하는 something 과 함께