Intelligence Feed event · Equity · 2026-09-26

    C3.ai CEO Sells $4.8M in Stock via 10b5-1 Plan Following 40% Share Price Decline

    Question

    C3.ai CEO Sells $4.8M in Stock via 10b5-1 Plan Following 40% Share Price Decline

    Direct answer

    Regulatory disclosures reveal C3.ai CEO Thomas Siebel sold approximately 444,000 shares across September 15-16, generating $4.8 million in gross proceeds. The transaction was executed pursuant to a Rule 10b5-1 plan established during a period in which the stock registered a 40% annual decline.

    Original publisher
    Market Ontology
    Evidence through
    2026-09-26
    Published
    2026-10-20
    Revision
    1 · 2026-10-20

    Cite as: Market Ontology, “C3.ai CEO Sells $4.8M in Stock via 10b5-1 Plan Following 40% Share Price Decline”, revision 1, evidence through 2026-09-26. https://marketontology.com/market-events/2026-09-26/c3-ai-ceo-sells-4-8m-in-stock-via-10b5-1-plan-following-40-share-price-decline-fd6402

    EQUITY
    C3.ai CEO Sells $4.8M in Stock via 10b5-1 Plan Following 40% Share Price Decline
    Regulatory disclosures reveal C3.ai CEO Thomas Siebel sold approximately 444,000 shares across September 15-16, generating $4.8 million in gross proceeds. The transaction was executed pursuant to a Rule 10b5-1 plan established during a period in which the stock registered a 40% annual decline.
    AI
    Impact
    56
    SEP 26
    SIG
    88%
    AI
    C3.ai CEO Sells $4.8M in Stock via 10b5-1 Plan Following 40% Share Price Decline
    Regulatory disclosures reveal C3.ai CEO Thomas Siebel sold approximately 444,000 shares across September 15-16, generating $4.8 million in gross proceeds. The transaction was executed pursuant to a Rule 10b5-1 plan established during a period in which the stock registered a 40% annual decline.
    → Executive insider selling via 10b5-1 programs increases secondary float supply in AI, compounding price pressure following multi-quarter equity drawdowns.
    Impact
    Regulatory disclosures reveal C3.ai CEO Thomas Siebel sold approximately 444,000 shares across September 15-16, generating $4.8 million in gross proceeds. The transaction was executed pursuant to a Rule 10b5-1 plan established during a period in which the stock registered a 40% annual decline.
    Affected
    AI
    Transmission
    Executive insider selling via 10b5-1 programs increases secondary float supply in AI, compounding price pressure following multi-quarter equity drawdowns.

    How this development reaches the affected companies

    AssetExposure and channelDirectionEvidence
    AIsecondary market supply pressure from executive share disposalDown1-5dC3.ai CEO sold ~444k shares for $4.8M following 40% drop.

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    What happened next

    Price follow-up pending — no stored daily closes for these assets yet.

    Closing prices from stored daily bars; returns measured from the last close on or before the event date. Not a recommendation.

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