Carroll Jill purchased ~$86M in Arcellx, Inc. stock
Arcellx, Inc. (ACLX) · Data via SEC EDGAR Form 4
Price Performance · 10 days before → 90 days after trade
▲ = insider buy date
90-day return
-52.0%vs SPY -11.4%
Trade Details · Public SEC Filing
Insider
Carroll Jill
Role
—
Transaction
Open-Market Purchase
Approx. Value
~$86M
Trade Date
Feb 8, 2022
Company
Arcellx, Inc.
Ticker
ACLXSource
SEC EDGAR Form 4
Why This Trade Stands Out
Strong conviction signal
Scored above average across multiple factors. Roughly 15% of insider trades qualify as Strong.
~$86M 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.
4 insiders traded in the same window
When multiple insiders independently buy within 30 days, it's called a cluster. Studies show clustered insider purchases outperform solo trades significantly, because several people with inside knowledge are reaching the same conclusion.
-52.0% in 90 days (S&P 500: -11.4%)
This trade underperformed the S&P 500 by 40.6 percentage points. Not every insider trade wins. We track all of them so you can focus on the insiders with the best records.
How good is Carroll Jill at picking stocks?
Full track record: win rate, average return, and performance vs S&P 500
Carroll Jill wasn't the only one buying.
4 insiders at Arcellx, Inc. traded within the same 30-day window.
See who else bought · FreeOn February 8, 2022, Carroll Jill — a corporate insider at Arcellx, Inc. — filed a Form 4 with the SEC disclosing an open-market purchase of approximately ~$86M in Arcellx, Inc. (ACLX) stock.
This transaction was part of a cluster — 4 insiders at Arcellx, Inc. made open-market purchases within the same 30-day window. Cluster activity from multiple independent insiders is one of the most studied patterns in insider trading research.
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.
In the 90 days following this trade, ACLX returned -52.0% versus -11.4% for the S&P 500 over the same period.
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 ACLX Insider Activity
Gilson Michelle
Feb 17, 2026
~$13M
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Jan 3, 2025
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Gilson Michelle
Jan 4, 2024
~$2.5M
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Heery Christopher
Dec 14, 2023
~$31M
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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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