I disagree. Ueno/Kuno are selling a small number of shares on the open market, not back to SCMP
Share buyback is done on the open market, with shares going into the treasury and decreasing the shares outstanding. Ueno/Kuno are selling on the open market, and their selling is accounting for about 10-20% of the recent daily volume. While their selling is not directly to one another, net effect is the same and their selling is enough to keep PPS down.
With the just announced Japan approval for Amitiza, we shall see how Takeda's interest evolves