Getty Images Cars near a highway entrance in Italy.Atlantia’s stock looked due for a trip north as the year began, and the rally has since come to pass. Investors might want to consider locking in their profits on the Italian operator of highways and airports, especially as a potential huge acquisition has turned into a worry for some analysts. The possible deal would be a multibillion-dollar buyout of Abertis InfraestructurasABE, +0.03% , though German construction company Hochtief HOT, +0.74% is also maneuvering to take over the Spanish operator of toll roads. It has been described as potentially the world’s biggest M&A agreement of the year when assumed debt is included, which pushes the value above $34 billion.via