Robin Geffen, the architect of Pru's AIA downfall, believes the botched deal could be a defining moment in the fight for investor justice.
The Neptune founder believes the battle to tackle Pru's proposed $35.5bn deal has been groundbreaking in the show of "solidarity and unity" amongst investment managers and wider shareholders, which he says stood together and rejected a deal that was not in the best interests of underlying investors.
Geffen says this message should not be forgotten in future transactions.
"I do not recall another turn of events like this in the City and I think there are some lessons to be learnt, namely for company management to speak with their shareholders early on in shaping any deal, listen to what they have to say and be prepared to face a united force if the deal is deemed contrary to investor interests," Geffen says.
Geffen believes "common sense" has prevailed and Pru is better off following its proven existing strategy.
"From the beginning it has been an absurdly ambitious attempt by the Pru to buy a large Asian company, at a very high price, with a very unclear strategy," he adds.
"But the real problem with the deal was that it didn't in fact give them any meaningful exposure to mainland China and India - which is exactly where the growth is.
"I think investors should feel enormously relieved that their dividend is substantially more secure with the Pru as a UK based and owned business, rather than prioritising Asian growth at any cost.
"Let's also not forget the probable job losses that we would have seen had the deal gone through."
Oversees £30bn of advised and D2C assets
£1bn business since inception
Considered doing so in 2015
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