KEY POINTS
  • "Memo to Moderna: You don't have to sell. You can sit on it," Jim Cramer said on "Squawk on the Street."
  • CEO Stephane Bancel's sales of stock this year and a secondary offering by the company in May have faced criticism as Moderna has provided regular updates on its Covid-19 vaccine candidate
  • Securities filings showed that Moderna executives sold shares over the past week, before releasing the data.

CNBC's Jim Cramer said Wednesday that he wants to see the insider stock sales activity at Moderna before deciding how confident to be about the vaccine data the drug company released on Tuesday night. 

"There's one document that I want to see. I want to see if anyone sold any stock at Moderna today or tomorrow. Because that will really determine to me whether this thing has just got to be put (with) a total asterisk. ... Memo to Moderna: You don't have to sell. You can sit on it," Cramer said on "Squawk on the Street."