It started the buyback on November 16th, the day after they presented at an Investors Conference.  Insiders started buying after this, under the cover of company buying and supporting the price. 

 

11/28/2016 Nokia share -  1.0 billion buy-back programme (2016-2017) Buy-backs during the programme   Date 
Date             Shares       Price    Amount in EU

11/16/2016    1,941,949 3.86    7,500,001

11/17/2016    1,934,885 3.88    7,500,001

11/18/2016    1,921,747 3.90    7,500,002

11/21/2016    1,923,768 3.90    7,500,002

11/22/2016    1,917,423 3.91    7,500,000

11/23/2016    1,925,694 3.89    7,500,000

11/24/2016    1,874,626 4.00    7,500,004

11/25/2016    1,844,293 4.07    7,500,002

Total              15,284,385  3.93    60,000,013