JPMorgan Chase, the largest but no longer the most profitable US bank, announced a 19% decline in first-quarter earnings this morning, with weaker income from trading and sluggish mortgage activity. Shares fell as much as 3.7% in pre-market trading. CEO Jamie Dimon is attempting to find the bank's footing amid stronger rules on capital requirements and intense scrutiny from regulators. JPMorgan's per-share earnings of $1.28 were 7% below what analysts were expecting. Of the 43 analysts covering the stock tracked by Bloomberg, 31 rate it a buy. The rest of the big banks will announce their results next week: Citigroup reports on April 14, Bank of America goes next on April 16, and Goldman Sachs and Morgan Stanley round out the big six on April 17.