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

NOTABLE INSIDER PURCHASES: Significant Insider purchases reported in the prior week from January 14 through January 18 include: 

• Beneficial Owner of GTT Communications (GTT) Spruce House Partnership purchased 1,092,000 shares of company stock at $24.96 per share for a total transaction value of $27,253,808
• Beneficial Owner of Century Bancorp (CNBKA) James Filler purchased 3,210 shares of company stock at $74.70 per share for a total transaction value of $239,788
• Officer of FS KKR Capital (FSK) Daniel Pietrzak purchased 50,000 shares of company stock at an average price of  $5.88 per share for a total transaction value of $293,995
• Shareholder Atlas Capital Resources purchased 191,117 shares of Horizon Global (HZN) company stock at $2.11 per share for a total transaction value of $403,964
• Beneficial Owner of vTv Therapeutics (VTVT) Ronald Perelman purchased 815,217 shares of company stock $1.84 per share for a total transaction value of  $1,499,999

NOTABLE INSIDER SALES: Significant Insider sales reported in the prior week from January 14 through January 18 include:

• Director of UnitedHealth Group (UNH) Richard Burke sold 15,000 shares of company stock at $260.55 per share for a total transaction value of $3,908,259
• Chairman of Curtiss-Wright  (CW) Charles Adams sold 7,000 shares of company stock at an average price of $111 per share for a total transaction value of $777,000
• CEO of Meet Group (MEET) sold 74,823 shares of company stock at $5.48 per share for a total transaction value of $410,030
• SVP of Verisk Analytics (VRSK) Vincent de P. McCarthy sold 3,090 shares of company stock at $114.09 for a total transaction value of $352,538

NOTABLE PRICE MOVEMENT AFTER INSIDER TRANSACTION: Shares of Century Bancorp were up approximately 3% for the week.