1. Jeff Bezos' worth hits $105.1B as Amazon shares climb 6.6% in January Full story

2. Berkshire Hathaway names 2 new vice chairs — Warren Buffett appoints potential successor Full story

3. IBM reassigns 30% of staff Full story

4. Tenet to cut 700 more jobs, says $1B divestiture plan is on track Full story

5. Delta shares up 2.5% as profit outlook rises Full story

6. Walmart to raise starting wage to $11 an hour

7. 12 takeaways from the 2018 JP Morgan Healthcare Conference — while the destination is uncertain, the direction is clear Full story