It isn't a shock in general, because everyone can plainly see what is happening and central banks have been telegraphing the changes.
However, the financial system is complex and the levels of risk/exposure to certain instruments that are highly sensitive to rates are not always transparent until it's too late. For example, in zeroing out the AT1 bonds of CS, holders of CoCo bonds more generally will currently be doing their nut and the whole market will be repricing risk, just because they wouldn't have anticipated being behind shareholders when taking a hit (even though they knew, in theory, their bonds could be zeroed out, which is indeed the whole point of them).
However, the financial system is complex and the levels of risk/exposure to certain instruments that are highly sensitive to rates are not always transparent until it's too late. For example, in zeroing out the AT1 bonds of CS, holders of CoCo bonds more generally will currently be doing their nut and the whole market will be repricing risk, just because they wouldn't have anticipated being behind shareholders when taking a hit (even though they knew, in theory, their bonds could be zeroed out, which is indeed the whole point of them).
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