Henderson finalised the acquisitions of Perennial Fixed Interest and Perennial Growth Management in November 2015.
The group's Pan Asia executive chairman Rob Adams said the acquisitions brought forward the Australian operations' strategy to grow its business.
The addition of the Perennial businesses added $11 billion to the Australian operation of Henderson, bring the current AUM to $17 billion, Mr Adams said.
"Despite the challenging market conditions, we have seen solid net flows from both retail and institutional clients across a diverse range of our local and global investment capabilities," Mr Adams said.
"The majority of the funds acquired in November 2015 have continued to deliver outperformance against their respective benchmarks over a 1 year return period and such solid outperformance is, of course, critical to realising this growth over the medium to long term."
Both Perennial businesses are now operating on the Henderson global operating model, having maintained key client relationships, Mr Adams said.
"We’ve been pleased that strong ratings have been maintained from both asset consultants and research houses," he said.
"The inroads we’ve made over the past 12 months are a true testament to Henderson’s unique platform. Investors benefit from our ability to provide the best of both worlds – boutique investment thinking within an institutional grade framework."
Hederson Global Investors entered into a 'merger of equals' with Janus Capital Group in October 2016, with the deal expected to close in the second quarter of 2017.
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