January 2015 and the Swiss franc: what a liquidity vacuum actually looks like

[Shadow Trader]

On January 15, 2015, the Swiss National Bank removed the euro floor of 1.20 against the franc without warning. EURCHF fell from around 1.20 to something near 0.85 within minutes, before bouncing back.

That kind of move makes headlines, but the part that matters for short-term traders is the mechanics. Bids vanished. Liquidity providers pulled quotes. Stop-loss orders triggered into an empty market and filled at prices far from where they were set. Several brokers went insolvent, and many clients ended up with negative balances.

The lesson isn't about the franc itself. It's about the assumption that stops guarantee a maximum loss. In a true gap, they don't. A stop is an order to trade at the next available price, and when no price is available, the next one can be a long way off.

The same pattern, on a smaller scale, shows up whenever a central bank breaks a regime: pegs, bands, or implied policy commitments.

Any currency with a managed regime carries the same type of tail risk, and scalpers rarely price it in.

A few facts help explain why the event felt so extreme. The floor had been in place for years, so many participants treated it as permanent. Positioning was heavily one-sided, with large long euro and short franc exposure. Leverage was high. When the floor vanished, those positions were on the wrong side of a market with no bids.

Trading platforms displayed prices that nobody would honor. Stop orders triggered, but there was nothing to fill against until much lower. Some clients saw their stops execute at prices more than a thousand pips away.

What stays relevant is the structure of the risk. Any pair controlled by a central bank policy carries this potential: pegs, floors, crawling bands, informal ranges. The quiet periods of such pairs are the very thing that makes them dangerous. Low volatility invites larger size, and larger size makes the eventual break more painful.

Which currency pairs deserve a permanent "avoid" label because of pegs or managed ranges?