Lennar Corp. has reclaimed its spot as the nation’s largest homebuilder after completing the acquisition of Arlington-based CalAtlantic Group.

Miami-based Lennar (NYSE: LEN) and CalAtlantic (NYSE: CAA) both received shareholder approval for the merger on Monday. The companies said the deal was effective at 11:59 p.m. Over 99 percent of shareholders at each company approved the deal.

The deal is valued at $9.3 billion, including $3.6 billion in debt. Each share of CalAtantic may be exchanged for…

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