51Talk Online Education Group (NYSE: COE) has another insider purchase on the books, and it extends what is quickly becoming one of the more notable buying streaks tracked on this site. On July 27, 2026, CEO, Director, and 10%+ owner Huang Jack Jiajia bought 451,320 shares of COE on the open market at $16.97 per share, a purchase worth $7,658,900.40. Following the trade, Huang’s stake stands at 33,225,960 shares, held indirectly through a trust or entity structure rather than in his own name.
This is not an isolated transaction. It’s the tenth open-market purchase by Huang in an eleven-day span, running from July 17 to July 27, 2026. Combined, those ten filings add up to $31,804,893 in personal capital spent acquiring COE shares. Our system flags this pattern as a cluster buy, a signal reserved for cases where an insider repeatedly returns to the market to purchase stock rather than making a single, one-off trade.
A Pattern That Keeps Growing
The size and frequency of these purchases stand out even by insider-buying standards. Most Form 4 filings show a single transaction tied to option exercises, vesting schedules, or routine compensation planning. Ten separate open-market buys from the same executive, spread across less than two weeks and totaling north of $31 million, is a materially different kind of disclosure. We covered an earlier stage of this same buying spree in 51Talk CEO Jiajia Huang Buys More COE in $28M Buying Spree, when the running total was closer to $28 million. The latest purchase pushes that figure higher still.
Because Huang holds the roles of CEO, director, and a 10%+ owner simultaneously, his trading activity carries added weight. Insiders in this position typically have the deepest visibility into a company’s operations, competitive position, and near-term outlook, and repeated personal purchases at this scale suggest a high degree of conviction in the stock at current prices.
Academic research on insider trading has found that clustered buying, meaning multiple insiders or repeated purchases by the same insider within a short window, tends to correlate with above-average stock performance in the periods that follow, more so than single, isolated purchases. That said, this pattern is being reported here strictly as a disclosed fact from SEC filings, not as investment guidance. Readers evaluating COE, or any stock with a similar insider-buying pattern, should treat filings like this as one data point among many, not a signal to act on directly.
Additional Form 4 filings tied to this buying spree may follow, and this site will continue tracking them as they are disclosed.
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Source: original SEC Form 4 filing.