May 6 (Reuters) - Australian toll operator Atlas Arteria on Wednesday rejected IFM Global Infrastructure Fund's offer to acquire all shares in the firm, stating that the offer "materially undervalues" the company and is "opportunistic."

IFM Global Infrastructure Fund, in late-April, had offered to acquire all the shares it does not currently own in Atlas Arteria, valuing the firm at A$6.89 billion ($4.95 billion).

($1 = 1.3924 Australian dollars)

(Reporting by Shivangi Lahiri in Bengaluru)