Every option trade moves money. Add up the dollar premium paid for calls versus puts across the market and you get net premium flow — a rough gauge of whether crowds are paying up for upside bets or for downside protection.
Why anyone watches it
Two ideas sit underneath. First, sentiment: heavy call-premium buying can signal speculative euphoria; heavy put buying, fear or hedging. Second, and more mechanical, dealer gamma. The market-makers on the other side of all this must hedge. When they are "short gamma," hedging forces them to buy as prices rise and sell as they fall — amplifying moves. When "long gamma," they do the opposite and dampen moves. Net premium flows feed estimates of where dealers sit.
The caveat that matters most
This is heavily marketed by "flow" data vendors, and it deserves real skepticism. The data is noisy: you rarely know who initiated a trade or why (a big put buy might be a hedge on a position you can't see, not a bet). Dealer positioning is estimated, not observed. Effects that are real for professionals operating intraday at scale mostly wash out for a retail investor holding for months. We make no claim that net premium flows predict returns, and nothing on this site is built on them.
Why include it at all
Because "flows" language is everywhere in options commentary, and you deserve to know both what it means AND why it isn't the edge it's sold as. Our income exposure comes from owning real covered-call funds with real track records — not from trading flows.
Educational material — not investment advice.