Wall Street's top bankers are getting their pay slashed, but at least they're keeping their jobs.

Investment banks cut pay to begin the year, when a disastrous first quarter hampered earnings. But now, even as markets and bank performance rebound — Morgan Stanley on Wednesday morning became the latest major Wall Street firm to top analysts' estimates — they're still slashing compensation.

It's a sign that the banking and trading businesses on which Wall Street's leading banks rely for billions of dollars in revenue are hitting peak efficiency. Having already pared down headcount to get profitable last quarter, it looks like big banks are running out of jobs to cut.