September 29, 2016 - The court granted defendants' motion to dismiss without prejudice.
December 14, 2015 - Defendants filed a motion to dismiss.

October 13, 2015 - The lead plaintiffs filed an amended complaint on behalf of investors who purchased MasTec Inc (NYSE: MTZ) common shares between May 1, 2014 and August 17, 2015. The lead plaintiffs allege that the defendants violated the Securities Exchange Act of 1934 by issuing false and misleading statements between May 1, 2014 and August 17, 2015.

August 5, 2015 - Lead plaintiffs and lead counsel were appointed and all cases were consolidated.

July 6, 2015 - Lead plaintiff motions were filed.

May 7, 2015 - An investor in shares of MasTec Inc (NYSE: MTZ) filed a lawsuit in the U.S. District Court for the Southern District of Florida over alleged violations of Federal Securities Laws by MasTec Inc in connection with certain allegedly false and misleading statements made between August 12, 2014 and March 17, 2015.

According to the complaint the plaintiff alleges on behalf of purchasers of MasTec Inc (NYSE: MTZ) common shares between August 12, 2014 and March 17, 2015, that the defendants violated Federal Securities Laws. More specifically, the plaintiff claims that defendants made allegedly false and/or misleading statements and/or allegedly failed to disclose that certain cost to complete estimates, currently believed to be in the range of zero to $13 million, which were recognized during MasTec Inc's third quarter of 2014, should have been recognized during the second quarter of 2014, that MasTec Inc’s internal control over financial reporting was ineffective, and that as a result of the foregoing, MasTec Inc's public statements were materially false and misleading at all relevant times.

Shares of MasTec Inc (NYSE: MTZ) grew from $9.67 per share in September 2010 to as high as $42.99 per share on March 28, 2014. MasTec Inc reported that its annual Total Revenue rose from over $2.14 billion in 2010 to over $4.32 billion in 2013 and that its respective Net Income increased from $90.53 million to $140.95 million.

On March 17, 2015, MasTec Inc announced that it will not be able to timely file its Annual Report on Form 10-K for the fiscal year ended December 31, 2014. According to MasTec Inc, the delay is the result of an ongoing independent internal investigation by the Audit Committee and its independent counsel, and that the Audit Committee “has not reached any conclusions and is undertaking additional review of accounting estimates.” MasTec Inc further stated that it “cannot predict the outcome of the Audit Committee’s investigation, its ultimate scope or when it will be completed.” Shares of MasTec Inc (NYSE: MTZ) declined to as low as $16.00 per share on March 18, 2015.