Anson Funds Management LP has a 13.3% stake in SOL.
As per latest SEDAR document
Link "
as of April 30, 2019, Anson, on behalf of the Funds, held or had ownership and control over a total of (i) 7,221,926 Common Shares; and (ii) Warrants exercisable for 30,000 Common Shares if exercised, representing approximately 13.29% of the issued and outstanding Common Shares (and the same percentage on a partially diluted basis, assuming the exercise of all Warrants held by the Funds)."
Anson was a net buyer from March 22 to Apr 30 2019