I quote a US bank expert:
Bank's equity drops when interest rate rises.
MUFG needs to sell AT1 bonds
When BoJ exits YCC, Japanese interest rates will eventually rise to a new higher norm (as can be seen from JGB bond yields) so MUFG's assets (JPY loans earning low interest for MUFG) will decrease in value. So it needs to shore up its balance sheet now before the interest rates start rising drastically.
USD$ instead of JPY denominated bonds
When BoJ exits YCC, USDJPY can drop by a lot as interest rates differential reverse. i.e. MUFG may be betting on USD to top out soon and then weaken relative to JPY down the road, so it will be easier for MUFG to redeem or pay the recurring interest on the AT1 bonds.
So my conclusion could still be right, that MUFG's USD$ AT1 bond issuance may indeed be a consequence of a bet on permanent rise in JGB yields.
Huh? Charles Schwab and other US banks got hit because they have an asset/loan duration mismatch, MUFG doesnt have this problem, their portfolio of JGBs has a weighted average maturity of <2 years.
Also banks dun generally place bets on FX, they make money from the loan/deposit spread, the reason for selling AT1s (according to the Bloomberg credit analysts) is clear:
But they may consider selling such debt in US dollars to help mitigate foreign-currency risk in their capital ratios, given they can get squeezed when the yen depreciates, Bloomberg Intelligence credit analysts including Pri De Silva wrote in September.
It has nothing to do with gambling on the direction of the Yen or USD. They have assets (loans) in dollars so they need dollars to shore up their CET1.
Anyway MUFG doesnt have a crystal ball, they are just like everyone else in the market, clueless about whats coming next.