(Reuters) – Zoom Video Communications Inc’s purchase of Five9, a cloud-based operator call center, for $14.7 billion (NASDAQ:) Inc was terminated by the two companies on Thursday. This effectively ended the largest ever acquisition in video conferencing.

After Institutional Shareholder Services had recommended earlier this month that five nine shareholders vote against the transaction, they cited growth concerns.

San Ramon-based Five9 stated that the agreement was not approved by the necessary number of shareholders from Five9 to merge with Zoom.

“Five9 will still be a separate publicly traded company.”

According to U.S. regulators, a U.S. Justice Department-led panel was reviewing Zoom’s all-stock purchase of Five9 and drafting a letter.

According to the Aug. 27 Federal Communications Commission letter, the Committee for the Assessment of Foreign Participation to the United States Telecommunications Services Sector had been reviewing the transaction to assess whether it “poses any risk to the nation security or law enforcement interest”.

Zoom’s largest deal to-date, according to analysts, could be delayed due to a U.S. Justice Department-led review, but it is unlikely that the deal will be abandoned.

Five9 stated that it will continue its partnership with Zoom, which was established prior to the announcement.