The Exchange Fund, which backs the Hong Kong dollar, posted an investment income of HK$18.6 billion for the third quarter, down 69 percent over the same period a year ago, data from the Hong Kong Monetary Authority showed on Friday.
The figure also represented a decrease of 83 percent from the second quarter.
For the first three quarters, the fund's investment income reached HK$171.9 billion.
In the third quarter, profits from bonds stood at around HK$300 million, down 99 percent year-on-year.
The investment in Hong Kong equities swung to a profit of HK$9.1 billion, compared with a HK$6.8 billion loss during the April-June period, while it indicated a decline of 47 percent year-on-year.
Profit of other equities dropped 98 percent quarter-on-quarter to HK$1.5 billion.
It also earned HK$7.7 billion from the positive currency translation effect of non-Hong Kong dollar assets.
