(Bloomberg) — B. Riley Financial Inc. faces a widening US investigation into whether it gave investors an accurate picture of its financial health amid a string of losses and a sagging stock price.Most Read from BloombergHow a Tiny Midwestern Town Became a Mecca for Modern ArchitectureHow Chicago’s Gigantic Merchandise Mart Is Still Thriving as Office SpaceLos Angeles Sees Remote Work Helping ‘No Car’ 2028 Olympic GamesIn DNC, Chicago’s Embattled Transit System Faces a High-Profile TestNYC Subw