In the first quarter, Wachenheim-based Greenhaven Associates acquired millions of additional shares in General Motors GM -1.42% (ticker: GM) and initiated a large position in Ford F -0.80% Motor (F). Greenhaven also significantly increased its investment in car seat manufacturer Lear LEA -1.30% (LEA) in the period. Greenhaven disclosed the transactions in a form filed with the Securities and Exchange Commission.