These big data warehouse businesses are fundamentally unable to protect the information they collect.
The size of their operation, and the financial pressures within the business, essentially guarantee that the focus is on sales and not security. Perhaps, even if the focus was on security, they still wouldn't be able to protect that data. The incentive to steal it is too great, and they need to have too many gateways open to it for their business to function.
The only solution is to end such services, which the financial industry is addicted to. It's banks, credit providers, finance companies and debt collectors who (legitimately) prize this data. The uses they've made of it in the past show that they might as well not bother. If they'd paid attention to their credit reports, the mortgage providers would never have sold millions of 'sub-prime' loans.
Of course, we're told such services are essential to credit liquidity. Without them commerce and funding for industry would grind to a halt. Yet finance was able to function before these services were computerized.
Like any business that makes big money, law and justice bends around around it. Goons in suits get rich at the expense of everybody else. They're just enthusiastic businessmen. They love their job. Why ever would we want to stop them?
I'm sure 64Fordman is right when he says nobody will go to prison, either for leaking the data, or for the insider trading that followed. But the real problem is the lack of regulation of these businesses in the first place. There are guides they have to follow in securing data, but they are all but useless, and there is no country in the world that applies any meaningful penalty if data is lost.
If the law had any teeth, a company that allowed a theft on the scale of millions of consumer's data would be subject to forfeiture of all its assets, including data, and the board-level executives would be held criminally negligent, with no recourse to passing blame down. Do I hear the sound of you belly laughing at such an idea? Are you literally busting a gut at the absurd unlikelihood of such a scenario ever arising? Think about that for a while. Think about what it really means. That you think the idea of law or justice being applied to the really rich is something funny... That's not just "how the world is", it's how we made it.