The Mexican cement giant is burdened with a heavy dollar-denominated debt load from its 2007 acquisition of Australian building products company Rinker.
ICA, Mexico's largest construction company, is in default on debt payments.
ICA sold its 49 percent stake in Proactiva Medio Ambiente México to a trust run by prominent Mexican businessman Fernando Chico Pardo.
América Móvil said it would separate its towers from the company after a sweeping sector reform forced it to open up its infrastructure.
The bank, Grupo Financiero Inbursa, and holding company Inversora Carso, have spent US$416,460,382 buying 474,120,133 shares, since their last report in August.
Mexican supermarket chain Soriana on Monday launched its offer to buy rival Comercial Mexicana at a price of 32.6124 pesos per share.
Cadu offered about 110.5 million shares in its primary offering, including its greenshoe option, and nearly 23.2 million shares in its secondary offering.
Earlier this week, Zuckerberg announced he would donate 99 percent of his Facebook shares, currently worth about US$45 billion, to a new philanthropic project he will run with his wife.
Shares in Mexican construction company ICA fell by more than 9 percent at the market open on Tuesday.
The offer includes 99 million shares, with an overallotment option of up to 9.9 million shares.