Carillion went into liquidation after the construction firm failed to secure a rescue deal in talks with lenders and the government, casting uncertainty over many of its contracts.
HICL, which had 10 facilities management subcontracts with Carillion subsidiaries, said the estimated impact of the insolvency would be about £50mln in net asset value on top of a previous provision of £9.4mln.
Shares fell 4.8% to 140.3p around midday.
“This situation is expected to continue until long-term replacement operators are in place, a process that the company anticipates will take a number of months,” it said.
HICL reassured investors that its dividend guidance remains unchanged for the current year and the next two financial years.
It said it will continue to work with its adviser InfraRed Capital Partners Limited to address affected public-private partnerships and to "maintain stable services in the near-term and to secure long-term, credible replacement operators”.
HICL is one of many companies that have said they will be hurt by Carillion’s failure.