Credit Suisse AT1 Bondholder Lawsuit Moves to Discovery

The legal battle over Credit Suisse’s dramatic collapse just took a sharp turn. A U.S. federal judge has ruled that investors who lost everything on the bank’s controversial Additional Tier 1 bonds—roughly CHF 16 billion worth—can move forward with discovery in their case.

This isn’t just legal housekeeping. It’s a major green light. For the first time, plaintiffs will be able to dig into internal communications, emails, and risk reports inside Credit Suisse—documents that may reveal what really happened in the months leading up to its downfall.

Back in October 2023, Core Capital Partners Ltd., a large institutional player, filed a class action in New York. Their complaint paints a troubling picture: while things were falling apart behind the scenes at Credit Suisse, the public was being told everything was fine.

The bank, they allege, reassured investors repeatedly that customer outflows had stabilized and that liquidity wasn’t a problem. But those public statements, according to Core Capital, didn’t match reality. Instead, they say the bank was bleeding client funds, struggling to stay afloat, and failing to address deep flaws in its internal risk controls.

Then came the emergency merger with UBS in March 2023. Swiss authorities pushed the deal through over a weekend. As part of it, they triggered a clause that allowed them to write down Credit Suisse’s AT1 bonds to zero. Gone. Just like that. Core Capital says that decision was just the final blow in a long chain of misleading behavior.

Names in the complaint include some of the bank’s top brass—people like Chairman Axel Lehmann, Ulrich Körner (the CEO), and CFO Dixit Joshi.

July 7 arrived with a decision from Judge Colleen McMahon that tilted things in the plaintiffs’ favor—and not just slightly, either. She refused to dismiss the central claims. More importantly, she gave the go-ahead for discovery.

That’s a big deal.

Here’s what the judge laid out:

In plain English? The court just gave Core Capital the green light to begin building its case from the inside out. That means subpoenas. Depositions. Internal risk memos. Anything that might show Credit Suisse executives had knowledge that contradicted their public reassurances.

There’s more. The judge also carved out a separate space for AT1 bondholders—literally.

Another case, filed earlier by investor Ali Diabat, had already moved forward and covered shareholders and some noteholders. But AT1 bondholders? They weren’t included. And when Diabat’s legal team decided not to bring their claims, Core Capital stepped up.

Judge McMahon officially confirmed it: AT1 bondholders are their own class. Core Capital is now their lead plaintiff. Their case will run in parallel—not absorbed into Diabat’s—and they’ll get their own shot at justice.

It’s a big win for investors who were previously left out in the cold.

This case isn’t just about Credit Suisse. What happens here could ripple across Europe’s entire banking sector.

AT1 bonds, also called CoCos, have become a go-to tool for European banks. They’re meant to act as a buffer in a crisis. Higher yield, higher risk. If things go sideways, they can be converted into shares or written down completely.

But here’s the twist: while investors know the risks are baked in, this lawsuit says the problem wasn’t the product—it was the pitch.

Until now, very few investors have gone to court over AT1 bond losses. If Core Capital succeeds, that might change.

The message to banks? Just because you issue risky bonds doesn’t mean you can withhold the truth.

And for investors: even if you take on high-risk instruments, you still deserve transparency. If the truth was hidden, you have the right to fight back.

With discovery now underway, the next couple of months could get very interesting. Emails, internal reports, board communications—anything could surface. And if it turns out the bank’s leadership knew things were worse than they admitted? That could shift the whole case.

Class certification is also coming up fast. Once that’s locked in, the case officially becomes a vehicle for all AT1 bondholders to pursue collective action—not just Core Capital.

What started as a dispute over an obscure bond clause is turning into a full-on reckoning over how one of Europe’s biggest banks communicated with its investors.

Ambassador Dario Item