Tesla shares fall 5% as Elon Musk’s ‘Master Plan 3’ is short on details about both cars and finances

Tesla Inc. shares declined more than 5% in the extended session Wednesday after the electric-vehicle maker teased a “next generation” electric vehicle in an investor-day presentation that promised a “Master Plan 3” but avoided disclosing firm details about Tesla’s new cars or its finances.

Tesla’s stock TSLA had advanced right after the closing bell having ended the regular trading day down 1.4%. The stock then saw losses accelerate as the event in Austin, Texas, progressed.

Tesla…