Carson Block doesn’t need a crystal ball to predict which companies are about to implode. He just needs a printer, some coffee, and the ability to read between the lines—literally.
The founder of Muddy Waters Research has spent nearly 16 years making a living by betting against companies that look too good to be true. And spoiler alert: they usually are. His latest target? SoFi, which he’s dubbed a “financial engineering treadmill”—basically the stock market equivalent of a hamster wheel that only benefits management bonuses.
Block’s method is refreshingly old-school in an age of algorithmic trading and AI-powered screening. He doesn’t trust fancy quantitative models. Instead, he prints out four years of earnings call transcripts and reads them like a detective hunting for clues. What’s he looking for? Red flags that would make any reasonable investor nervous: emotional language, big initiatives that mysteriously vanish, and questions that get dodged faster than a politician at a town hall.
“If things appear too good to be true, they are,” Block told Business Insider. And he’s got the track record to back it up. His 2011 call on Sino-Forest—a Chinese agricultural company—wiped billions off the market and made him a Wall Street legend. Since then, Muddy Waters has published dozens of short reports, each one meticulously researched and legally bulletproof. Block notes they’re “undefeated” in court, which is pretty impressive when you’re essentially calling companies liars for a living.
The SoFi thesis is classic Block. The fintech darling performed well through 2025, but momentum stalled in early 2026. Then came a capital raise that diluted shareholders—a move Block sees as a massive red flag. When he and his team dug deeper, they found what they were looking for: a company that looked shiny on the surface but was held together with financial duct tape and creative accounting.
What makes Block’s approach so effective is that he’s not looking for smoking guns—he’s looking for smoke. He examines the language executives use on calls, noting when they get defensive or vague. He tracks which initiatives get hyped and then quietly abandoned. He watches for insider selling. These behavioral cues tell a story that spreadsheets often miss.
The irony? Block’s methods aren’t rocket science. Any investor could do this. Print the transcripts. Read them. Ask yourself: does this add up? Are the executives being straight with me, or are they tap-dancing around the truth? Do the numbers match the narrative?
SoFi pushed back hard, calling Muddy Waters’ report inaccurate and claiming the short-seller doesn’t understand the business. But Block’s already heard that song before. When you’ve been doing this for 16 years and haven’t lost a legal battle, you’ve probably got your facts straight.
The lesson here isn’t that SoFi is definitely doomed—that’s for the market to decide. The lesson is that sometimes the best investment research tool isn’t an algorithm or a Bloomberg terminal. It’s your own brain, a stack of transcripts, and the willingness to ask uncomfortable questions.
