Stripe and Advent International lobbed a $53 billion bid for PayPal on July 15, sending the stock up more than 17 percent in a single session. The market cheered, but the math suggests the buyers are hoping to catch a falling knife at a discount.

PayPal is barely five months into a turnaround under Enrique Lores, who left the HP chief executive role in February to take the reins. Companies typically give a new boss more than a quarter before deciding the patient is terminal, but Stripe and Advent are betting the board’s patience runs thinner than the market’s.

The offer works out to $60.50 a share, a 30 percent premium to the July 10 close. That sounds generous until you remember PayPal traded at that level in early December. The stock closed at $55.52 on the day of the bid, meaning the premium had already evaporated by the time investors could react. Meanwhile, the company threw off $6.4 billion in free cash flow last year and sat on $13.5 billion in cash and investments at the end of March. At that run rate, the acquirer earns back the purchase price in under nine years, assuming zero growth.

Shareholders who have tired of the turnaround narrative might take a deal at the right number. This isn’t it. PayPal returned $1.5 billion to owners via buybacks in the first quarter alone, a signal that management thinks the stock is cheap enough to buy itself. That gives holders a reason to wait, and the board a reason to say no.

The real signal may be what comes next. The source describes the bid as a feeler, and if PayPal rejects it on price rather than principle, a higher offer often follows. For now, Stripe and Advent have put a public floor under the shares. Whether that floor becomes a ceiling depends on how badly the buyers want in.