What Is Cluster Buying? One of the Most Important Insider Trading Signals on the TSX
When a single executive buys shares in their own company, it’s a meaningful signal. When multiple insiders buy the same stock within days of each other — independently, with their own money — that’s cluster buying, and it’s one of the most important insider trading signals you can find on the TSX.
What Is Cluster Buying?
Cluster buying occurs when two or more insiders at the same company make open-market share purchases within a short window — typically 5 to 10 days of each other. These are not coordinated trades. Each insider is acting independently, using their own capital, and filing their own SEDI disclosure. The fact that multiple people inside the same organization are reaching the same conclusion at the same time is what makes it significant.
TSX Insider defines a cluster buy as two or more open-market purchases (transaction code 10) at the same company within a 5-day window. Each trade is verified against SEDI filings individually.
Why Cluster Buying Matters
A single insider buy can happen for many reasons — a scheduled purchase plan, portfolio rebalancing, or simply personal conviction. But when a CEO, a CFO, and a Director all independently decide to buy the same stock within the same week, the probability that they’re all acting on the same underlying confidence is high. The signal is amplified by the number of participants and the independence of each decision.
Consider what it takes for a cluster buy to happen:
- Each insider must individually decide the stock is worth buying at the current price
- Each must commit their own personal capital — not options, not RSUs, actual cash
- Each must file a public SEDI disclosure within 5 calendar days
- None of this is coordinated — insiders can’t legally tip each other on non-public information
The convergence of independent conviction is what separates a cluster buy from a routine transaction.
Real Cluster Buy Examples From the TSX
The following examples are sourced directly from SEDI filings and tracked by TSX Insider. All are open-market purchases, transaction code 10.
AtkinsRealis Group — March 17, 2026
CEO Ian L. Edwards — 20,512 shares @ $92.03 — $1,887,750
President Steve J. Morriss — 31,967 shares @ $92.03 — $2,941,971
Combined: $4,829,721 — Same day — Cluster Buy
Americas Gold and Silver — March 31, 2026
Director Tara Hassan — 10,079 shares @ $7.21 — $72,678
Director Bradley Robert Kipp — 11,500 shares @ $6.98 — $80,270
Director Gordon E. Pridham — 10,000 shares @ $7.03 — $70,300
Combined: $223,248 — Same day, three directors — Cluster Buy
TELUS — December 2025
Director Marc Parent — 60,000 shares @ $17.59 — $1,055,289 (Dec 16)
CEO Darren Entwistle — 192,600 shares @ $17.38 — $3,347,960 (Dec 19)
Combined: $4,403,249 — 3 days apart — Cluster Buy
Barrick Mining — November 21, 2025
COO Africa & Middle East Johann Sebastiaan Bock — 18,124 shares @ $37.83 — $685,631
Group COO, President & CEO Mark Francis Hill — 38,459 shares @ $53.09 — $2,041,788
Combined: $2,727,419 — Same day — Cluster Buy
How to Interpret a Cluster Buy
Not all cluster buys are equal. Here’s what to look for when evaluating one:
Who is buying?
C-suite participation (CEO, CFO, COO) carries more weight than minor shareholders or junior directors. The AtkinsRealis example above — CEO and President buying on the same day — is a particularly strong signal because both individuals have full visibility into the company’s operations and pipeline.
How large is the purchase relative to their existing position?
A director who increases their share balance by 25% is making a much stronger statement than one adding 0.5%. TSX Insider flags trades where the balance increase exceeds 10% (Notable) or 20% (Significant), which helps filter out routine top-ups.
What is the market context?
Cluster buying during a broad market selloff or after company-specific bad news is more meaningful than buying into a rally. Insiders who buy when the price is under pressure are demonstrating conviction against the prevailing sentiment.
How close together are the trades?
Same-day cluster buys like AtkinsRealis and Americas Gold are the tightest possible signal. Buys within 3–5 days still represent strong convergence. Beyond 10 days, the trades may be coincidental rather than a genuine cluster pattern.
Cluster Buying vs. Single Insider Buys
Single insider buys are valuable data points. Cluster buys are a different category of signal. When you see a CEO buy, you’re seeing one person’s conviction. When you see a CEO, a President, and two Directors all buy the same stock within days of each other, you’re seeing organizational-level confidence expressed through personal capital. That’s a meaningfully higher bar.
TSX Insider tracks both — flagging individual Notable and Significant trades while also identifying cluster patterns automatically across the TSX, TSX-V, CSE, and NEO exchanges.
TSX Insider identifies cluster buys automatically — updated daily from SEDI filings across all Canadian exchanges.