The results of tests and scans this week.
Tests and scans this week showed that there was "no evidence of cancer" left in his body.
Dimon concluded the memo by urging employees to "take care of your health first. Nothing is more important."
On Wednesday, Dimon had announced he had completed cancer treatment and that his "prognosis is very good."
He was diagnosed with throat cancer in July and was undergoing treatment.
Shares of the biggest U.S. bank by assets rose as much as 2.7 percent to a 14-year high of $63.06 in late U.S. morning trading.
-Reporting by CNBC's David Faber, writing by CNBC's Evelyn Cheng. Reuters contributed to this report.