1. Time Warner acquired by AOL

Announced: Jan 2000
Completed: Jan 2000
Price at announcement: $162,000,000,000
Adjusted for October 2017: $236,726,340,000

2. Time Warner acquired by AT&T

Announced: October 2016
Price at announcement: $85,400,000,000
Adjusted for October 2017: $87,143,120,000

3. EMC acquired by Dell

Announced: October 2015
Completed: September 2016
Price at announcement: $67,000,000,000
Adjusted for October 2017: $69,486,040,000

4. Spectrum acquired by Charter Communications

Announced: May 2015
Completed: May 2016
Price at announcement: $56,000,000,000
Adjusted for October 2017: $58,085,940,000

5. DIRECTV acquired by AT&T

Announced: July 2015
Completed: July 2015
Price at announcement: $48,500,000,000
Adjusted for October 2017: $50,127,610,000

6. NXP Semiconductors acquired by Qualcomm

Announced: October 2016
Price at announcement: $47,000,000,000
Adjusted for October 2017: $47,959,330,000

7. Nextel Communications acquired by Sprint

Announced: August 2005
Completed: August 2005
Price at announcement: $35,000,000,000
Adjusted for October 2017: $43,957,260,000

8. O2 acquired by Telefonica

Announced: November 2005
Completed: January 2006
Price at announcement: $31,600,000,000
Adjusted for October 2017: $39,446,110,000

9. Level 3 Communications acquired by CenturyLink

Announced: October 2016
Price at announcement: $34,000,000,000
Adjusted for October 2017: $34,693,980,000

10. ARM acquired by SoftBank

Announced: July 2016
Completed: September 2016
Price at announcement: $32,000,000,000
Adjusted for October 2017: $32,802,570,000