CoCo Bond ETFs: High Yield With a Trigger

You bought a preferred fund. You may also own Europe's riskiest bank debt

A preferred-stock ETF looks like a quiet income holding. Steady payout, a yield near 6%. Inside some of these funds sits a security that can go to zero on a weekend at a regulator's say-so: the bank contingent convertible, or CoCo.

If you hold FPE, nearly a quarter of the fund is in CoCo bonds. Most buyers never picked that on purpose. Worth knowing what it is and how much you own.

What an AT1 CoCo actually is

Banks issue Additional Tier 1 bonds, the most common kind of CoCo, to meet the capital rules written after 2008. The trade is simple: you collect a high coupon, and the bond stands first in line to absorb losses if the bank runs into trouble.

Two things can pull the trigger. A mechanical one trips when the bank's Common Equity Tier 1 ratio falls through a preset level, usually 5.125% or 7%, converting the bond to equity or writing it down. The other needs no ratio breach at all: a regulator can declare the bank at its "point of non-viability" and write the bonds off on judgment alone. The Bank for International Settlements lays out both in its 2013 primer on the instrument.

The Credit Suisse lesson

The discretionary trigger is the one investors keep underpricing, and in March 2023 it fired in public. When UBS absorbed Credit Suisse, Swiss regulator FINMA wrote roughly CHF 16 billion (about $17 billion) of AT1 bonds down to zero while shareholders still walked away with CHF 3 billion in UBS stock. The hierarchy ran backwards. Bonds that were supposed to rank above equity were wiped while equity survived.

The same day, EU regulators (the ECB, the Single Resolution Board, the European Banking Authority) said that is not how their framework works, where common equity absorbs losses first and AT1 only after. The protection you think you have depends on which regulator is in charge.

The court fight isn't over. In October 2025 a Swiss court annulled FINMA's write-off, and the case is now with the Federal Supreme Court. Even if bondholders get paid back in the end, the lesson holds: an AT1 can be wiped out overnight, and the rules can bend in a crisis.

Why there is no clean US wrapper

If you want pure AT1 exposure in a single fund, the products exist. The WisdomTree AT1 CoCo Bond fund and the Invesco AT1 Capital Bond fund both hold nothing else, and a European investor can buy either directly. They are UCITS funds, though, so a US brokerage generally can't offer them at all, and no US-listed ETF holds CoCos as its mandate.

So if you're limited to US-listed funds, you get AT1 indirectly, inside preferred and hybrid funds. AT1 bonds are bank hybrids, so any fund holding bank hybrids holds CoCos too. You own them whether the fund's name mentions it or not.

Not every preferred fund is the same

Two funds can both call themselves preferred and hold very different things.

FPE, First Trust's actively managed fund, reports 24.97% of the portfolio in CoCo bonds, much of it European bank debt. Its 30-day SEC yield is 5.59%, and it charges 0.83% a year, per First Trust. A meaningful share of your payout there rides on a UK or Spanish bank staying above its capital trigger.

PFF, the $13 billion iShares fund, tracks a US-focused preferred index built mostly on $25-par retail preferreds. Financials are 62% of the book, but barely 4% of it sits outside the US, so the CoCo content rounds to nothing next to FPE's quarter. It yields 6.34% at a 0.45% expense ratio, per iShares. Invesco's PGX and Global X's cheaper PFFD (0.23%, yielding 6.38%) are just as US-focused.

The fund with the most CoCo is the one whose income depends most on a single European bank staying healthy. The word "preferred" on the label tells you none of this. Like any bond ETF, you have to read the holdings to see the real risk.

Should you own any

Start with what a CoCo doesn't do: diversify. It's bank debt that acts like bank stock when things go wrong, so the same panic that sinks your shares is what pushes a CoCo toward its trigger. It won't cushion a stock crash the way a cat bond can. The high coupon is your pay for a concentrated bet on banks.

In calm years it pays well, more than safer bank bonds, and European banks today hold far more capital than in 2008. But the downside is all-or-nothing. A CoCo can be wiped to zero overnight on a regulator's call, with no slow slide you can wait out like a falling stock.

If you already own banks through a broad index fund, a separate AT1 fund just piles more onto banks you already hold. Most investors don't need one. The smarter move is the opposite: open the fact sheet of the income fund you bought for stability and find the CoCo or AT1 line. If it reads 25%, that safe-looking fund is really a bet on European banks staying healthy. That can be a bet you make on purpose. Just don't make it by accident.