Shares in Better Home & Finance soared Monday on a bullish assessment of the money-losing mortgage lender’s prospects by Eric Jackson — the activist investor whose interest in Opendoor Technologies helped spawn a stock rally and CEO ouster in August. That set off a flurry of trading, with more than 7 million shares bought and sold — about 85 times more than the average volume. Known for its technology, Better saw business boom when homeowners rushed to refinance during the pandemic. After funding $58 billion in loans in 2021, Better racked up an $889 million loss the following year when mortgage rates rebounded. Better’s loan production dwindled to $11.4 billion in 2022 and bottomed out at $3 billion in 2023.