IFM Investors has secured more than 60% ownership of Atlas Arteria, effectively concluding its four-year hostile takeover bid for the ASX-listed toll road operator.

The accumulation of shares brings the $7.4 billion campaign to a close, granting the global investment group decisive control over the infrastructure firm's strategic direction.

The $268 billion asset manager is expected to implement significant changes to the toll road operator's management structure.

The milestone follows IFM's earlier crossing of the 50% ownership threshold, which had already signaled the likely end of the protracted battle.

With the bid nearing its finish line, the focus now shifts to the operational overhaul of Atlas Arteria's portfolio, particularly the management of the Chicago Skyway in the United States.

The $268 billion asset manager is expected to implement significant changes to the toll road operator's management structure.

The resolution comes amid turbulence for Atlas Arteria's leadership.