Welcome to "Fly Insider," The Fly's weekly recap of notable insider stock transactions.

NOTABLE INSIDER PURCHASES: Significant insider purchases reported in the prior week December 19 through December 23:

Director and Beneficial Owner of Groupon (GRPN) Jan Barta purchased 6,716,966 shares of company stock at $7.28 per share for a total transaction amount of $48,899,512

Director of Terns Pharmaceuticals (TERN) Hongbo Lu purchased 758,620 shares of company stock at $7.25 per share for a total transaction amount of $5,499,995

Beneficial Owner of Design Therapeutics (DSGN) SR One Capital Fund purchased 900,000 shares of company stock at $8.42 per share for a total transaction amount of $7,574,130

CEO of BRT Apartments (BRT) Jeffrey Gould purchased 10,000 shares of company stock at $19.83 per share for a total transaction amount of $198,255

NOTABLE INSIDER SALES: Significant insider sales in the prior week from December 19 through December 23:

Beneficial Owner of Air Transport Services Group (ATSG) Amazon.com sold 260,000 shares of company stock at $26.99 per share for a total transaction amount of $7,017,400

Beneficial Owner of AutoNation (AN) Edward Lampert sold 296,547 shares of company stock at $104.81 per share for a total transaction amount of $31,080,913

VP of AmerisourceBergen (ABC) Silvana Battaglia sold 9,852 shares of company stock at $167 per share for a total transaction amount of $1,645,284

VP of Campbell Soup (CPB) Adam Ciongoli sold 37,354 shares of company stock at $56.86 per share for a total transaction amount of $2,123,948

NOTABLE PRICE MOVEMENT AFTER INSIDER TRANSACTION: Shares of Terns Pharmaceuticals moved up almost 28% after Director Hongbo Lu purchased 758,620 shares of company stock at $7.25 per share, while shares of Air Transport Services Group moved lower by approximately 5% after beneficial owner Amazon.com (AMZN) sold 260,000 shares of company stock at $26.99 per share.