The slowdown is expected to continue this year as global trade contracts and the fall in box volumes, coupled with the loss of a key SAGT client, is likely to erode JKH group earnings, analysts said.
"The declining performance can be attributable to the global recession that resulted in a slow down in international trading activities," stock brokers Lanka Securities said in a report.
"We believe SAGT volumes to decline further with the affects of long lasting global recession."
JKH has a 38 percent stake in South Asian Gateway Terminals and counts the terminal operator as an associate firm.
SAGT also lost a key client, APL, to the state-owned Jaya Container Terminal last year. APL handles over 200,000 boxes through Colombo, shipping industry analysts said.
The JKH group's transportation business, which includes the Lanka Marine Services (LMS) ship fuel unit, has emerged as its main source of profits in recent years.
But LMS lost a tank farm and an effective monopoly in fuel supply in Colombo port last year when the island's supreme court ruled them as having been acquired illegally.
"We believe the margins of SAGT and LMS will come under pressure with the pressure mounting on international trading activities with the global recession," Lanka Securities said.
The fall in box volumes at SAGT comes after months of record growth with the terminal exceeding its original design limits owing to highly efficient operations and modern equipment.
JKH transportation business profits almost halved to 343 million rupees in the December 2008 quarter and to 1.1 billion rupees in the nine months ending December 31, 2008 compared with the same periods a year ago.