It said it was considering a placement of up to 1.6m shares worth $49m - 8.5% of its capital - to institutional investors outside the US.
This will pay for a portion of the £281.2m ($441m) purchase price - the part made up of loan notes and cash.
The rest is being settled in Clarksons shares.
If the plan is not carried out, it will fund this part of the deal from existing and future cash resources.
Clarksons
