This is demonstrably untrue and yet you proffer it as fact. The pensions benefit from rates rising, because higher rates decrease their liabilities more than it decrements the value of their bonds. The pensions have, as a result, entered swap positions go hedge themselves against rates falling. The only issue is that the sudden drop in the gilt has created a feedback loop in the gilt sell off.

There is a reason why explanations of what went on are so complicated… It’s because pension math is extremely boring. However, you cannot understand the situation, even intuitively, without going into the nitty-gritty to try to learn the plumbing.

Your mistruth is incredibly corrosive to discussion on this site. @dang please keep an eye out.

Edit: I’m reading through the comments here and virtually everyone has it wrong. The pensions made what should have been a good decision to hedge their liabilities. They made a bad decision in terms of forecasting their liquidity needs in a high-stress rate scenario.

Don't look at the word "margin call" and assume they did something wrong. Simplistically, if you're getting called on a hedge, you're probably making money, just less of it. On a position like this, the fund faces a "margin call" every day. It's called variation margin, and all that means is the position's PNL is settled on a cash basis, daily. You may be thinking of a margin call in terms of a retail investor naked shorting a stock that has subsequently tripled in value. It's nothing like that. Variation margin "calls" are part of the structure of the instrument.

I've consulted pensions. Saying that pension fund managers did this to "pay themself large bonuses" is laughable – pension fund managers aren't compensated like other areas of finance so the incentive is always to be more risk averse because they want to keep their jobs.

Edit edit: I don’t mean to say these pension mgrs don’t deserve criticism. It’s just that what I see is so off mark.