Data below is sourced from Alpha Vantage’s market data feed, last updated 2026-09-21 16:15 US/Eastern. This is a factual recap of trading activity, not investment advice — see our disclaimer.
Most Actively Traded
Trading volume today was concentrated in a handful of names:
- WBD (Warner Bros. Discovery) closed at $30.80, up 10.79% on the day, with over 233 million shares traded — one of the heaviest-volume sessions of the week for the stock.
- INTC (Intel) closed at $121.78, up 12.14%, with roughly 188 million shares changing hands.
- BTTC was the single most active ticker by share count (over 418 million shares), up 117.75% on the day.
Top Gainers
The day’s biggest percentage gainers were dominated by small- and micro-cap names, led by GRML (+230.5%), GLNDW (+186.2%), and GLND (+141.3%). Moves of this size in low-priced, low-market-cap stocks are typically driven by low share counts and thin liquidity rather than company-specific news — worth noting before reading too much into the percentage alone.
Top Losers
On the downside, the largest percentage declines were concentrated in warrants and thinly traded micro-caps, including RIV^ (-69.6%) and ASGI^# (-61.1%).
Takeaway
The notable story today is the two large, widely-held names — Intel and Warner Bros. Discovery — both posting double-digit percentage gains alongside unusually high volume. That combination (large-cap + high volume + big move) is generally more meaningful than the same percentage move in a micro-cap stock most traders have never heard of.
We’ll be back tomorrow with the next session’s movers.
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