Sources: Rakuten, which owns a 13% stake in Lyft, made the investment in 2015 after data from its consumer purchase tracker Slice showed Lyft was undervalued (Ari Levy/CNBC)

Ari Levy / CNBC:
Sources: Rakuten, which owns a 13% stake in Lyft, made the investment in 2015 after data from its consumer purchase tracker Slice showed Lyft was undervalued  —  - Rakuten invested $300 million in Lyft in 2015, when the ride-hailing company was trying to avoid being crushed by Uber.