WK Kellogg (KLG) was Smart Insider's stock pick of the week after the company's lead director Zachary Gund bought about $3.5 million worth of WK Kellogg's shares at $17.67 per share Thursday.

The purchase, which increased Gund's ownership in the company by 49% to 592,000 shares, is a "large confident purchase" and his first since the company was spun off from Kellogg last year, Smart Insider said in a note Tuesday.

"It's encouraging to see him buying now," the note added.

Smart Insider ranked the stock +1, or strong positive signal, on Friday.