As of early Friday afternoon, Mitsubishi UFJ Financial Group’s long-awaited investment in Morgan Stanley could more than give the Japanese bank a big stake in the embattled firm. Technically, it could buy Morgan Stanley outright.

Given the steep slide in Morgan Stanley’s stock, the firm’s market value is now worth about $8.4 billion, having come up from even further lows. Mitsubishi’s investment — the apparent subject of numerous rumors around trading floors — is for $9 billion, for 21 percent of the American investment bank.

Shares in Morgan Stanley traded at about $7.40 by early afternoon Friday.

It’s worth noting that Mitsubishi would open itself up to potential new hazards were it to try and acquire more than 21 percent of Morgan Stanley. As The Wall Street Journal pointed out on Friday, under federal regulations, owning 25 percent or more of a bank constitutes control, imposing several financial constraints on Mitsubishi.

And by owning Morgan Stanley outright, Mitsubishi would leave another recent acquisition, UnionBanCal of California, exposed to the investment bank’s liabilities. (And therefore, the Federal Deposit Insurance Corporation as well.)

(Thanks to Dealbreaker for the pointer.)

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