Xu Diyong purchased ~$10M in QTTB stock
QTTB (QTTB) · Data via SEC EDGAR Form 4
Price Performance · 10 days before → 90 days after trade
▲ = insider buy date
Trade Details · Public SEC Filing
Insider
Xu Diyong
Role
—
Transaction
Open-Market Purchase
Approx. Value
~$10M
Trade Date
May 28, 2026
Company
QTTB
Ticker
QTTBSource
SEC EDGAR Form 4
Why This Trade Stands Out
Very Strong conviction signal
Scored in the top tier across multiple factors. Fewer than 5% of insider trades receive this rating.
~$10M purchase
Trades over $1M are rare. When insiders put this much of their own money on the line, they tend to have high conviction in their company's direction.
How good is Xu Diyong at picking stocks?
Full track record: win rate, average return, and performance vs S&P 500
On May 28, 2026, Xu Diyong — a corporate insider at QTTB — filed a Form 4 with the SEC disclosing an open-market purchase of approximately ~$10M in QTTB (QTTB) stock.
Under Section 16(a) of the Securities Exchange Act of 1934, corporate insiders must report all open-market stock transactions to the SEC within two business days. These filings — known as Form 4s — are publicly available on the SEC's EDGAR database. VeritySignals filters and scores the full Form 4 stream to surface high-conviction signals like this one.
VeritySignals Conviction Analysis
Full Conviction Analysis
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All data sourced from publicly available SEC Form 4 filings via EDGAR · Not financial advice · Past performance does not guarantee future results.
At a Glance
More QTTB Insider Activity
ORBIMED ADVISORS LLC
May 28, 2026
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ORBIMED ADVISORS LLC
May 28, 2026
~$5.0M
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Xu Diyong
May 28, 2026
~$5.0M
VS
ORBIMED ADVISORS LLC
May 28, 2026
~$150M
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How to Read Insider Trades
What is this?
When company executives buy or sell their own stock, they must report it to the SEC within 2 days. These public filings reveal what the people who know the company best are doing with their own money.
Why does it matter?
Insiders can sell for many reasons (taxes, diversification, expenses), but they generally only buy for one: they think the stock is going up. That's why insider purchases are more predictive than sales.
What makes a trade "strong"?
We score trades on 15+ factors: the insider's role (CEO > director), trade size relative to their salary, whether other insiders also bought (clusters), and historical accuracy of the insider.
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