Siemens plans to acquire Altair Engineering for approximately $10 billion as part of its plan to strengthen its software business, the company announced on Wednesday. The Munich-based conglomerate signed an agreement the Michigan-based firm that would give Altair shareholders $113 per share. The acquisition is expected to be completed by year’s end. Altair, with some 3,500 employees, provides industrial software for companies in sectors such as aerospace, automotive, and energy, as well as in financial services. The demand for this software is expected to increase with the growing prevalence o…