Vinci, which employs 179,000 people and has revenues of €36.9bn, works on a number of high-tech and large-scale projects across the globe (see image above).
As a result of the hoax, shares in the firm plummeted 19 per cent, and finished three per cent down when trading closed yesterday, the FT reported.
In a response posted on its website, Vinci denied all information contained in the release, and said it would now be considering legal action.
Vinci has yet to respond to PRWeek's request for further comment, but financial structuring firm Hawksmoor Partners asked whether the hoax signals a need to bring regulation to the public relations industry.
The issue of fake news has been the subject of concern among media and politicians in recent weeks, as Facebook and Google have been forced to respond to the apparent proliferation of fabricated information distributed via the platforms about the US election.
Speaking to PRWeek sister title Campaign about its impact, Tony Telloni, a veteran PR executive who has held senior positions at SparkPR and Golin, said fake news spreads fast on social media, but can cause damage to a brand that takes "anywhere from six weeks to six months" to repair. PepsiCo is just beginning this process after fake quotes were attributed to its CEO.
UPDATE: Following publication of this story, a spokesperson for Bloomberg provided the following statement: "As soon as we realised the press release was a hoax, we corrected our headlines immediately. We have been in touch with Vinci's leadership, and are investigating the situation."