Intelligence Feed event · Equity · 2026-09-26

    Reddit and C3.ai CEOs Execute Programmatic Rule 10b5-1 Share Dispositions

    Question

    Reddit and C3.ai CEOs Execute Programmatic Rule 10b5-1 Share Dispositions

    Direct answer

    Regulatory filings confirm executed insider stock sales under Rule 10b5-1 trading plans by top leadership at Reddit (RDDT) and C3.ai (AI). Reddit CEO Steve Huffman liquidated 17,308 shares valued at $2.8 million, while C3.ai CEO Thomas Siebel disposed of roughly 444,000 shares totaling $4.8 million on September 15-16. While pre-scheduled 10b5-1 plans insulate executives from discretionary timing scrutiny, programmatic selling into 40% trailing declines provides observable supply distribution data for tech sector positioning.

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

    Cite as: Market Ontology, “Reddit and C3.ai CEOs Execute Programmatic Rule 10b5-1 Share Dispositions”, revision 1, evidence through 2026-09-26. https://marketontology.com/market-events/2026-09-26/reddit-and-c3-ai-ceos-execute-programmatic-rule-10b5-1-share-dispositions-e8c4b8

    EQUITY
    Reddit and C3.ai CEOs Execute Programmatic Rule 10b5-1 Share Dispositions
    Regulatory filings confirm executed insider stock sales under Rule 10b5-1 trading plans by top leadership at Reddit (RDDT) and C3.ai (AI). Reddit CEO Steve Huffman liquidated 17,308 shares valued at $2.8 million, while C3.ai CEO Thomas Siebel disposed of roughly 444,000 shares totaling $4.8 million on September 15-16. While pre-scheduled 10b5-1 plans insulate executives from discretionary timing scrutiny, programmatic selling into 40% trailing declines provides observable supply distribution data for tech sector positioning.
    RDDTAI
    Impact
    57
    SEP 26
    SIG
    90%
    RDDTAI
    Reddit and C3.ai CEOs Execute Programmatic Rule 10b5-1 Share Dispositions
    Regulatory filings confirm executed insider stock sales under Rule 10b5-1 trading plans by top leadership at Reddit (RDDT) and C3.ai (AI). Reddit CEO Steve Huffman liquidated 17,308 shares valued at $2.8 million, while C3.ai CEO Thomas Siebel disposed of roughly 444,000 shares totaling $4.8 million on September 15-16. While pre-scheduled 10b5-1 plans insulate executives from discretionary timing scrutiny, programmatic selling into 40% trailing declines provides observable supply distribution data for tech sector positioning.
    → Programmatic Rule 10b5-1 executive share sales introduce recurring non-fundamental supply pressure across RDDT and AI during periods of negative 12-month momentum.
    Impact
    Regulatory filings confirm executed insider stock sales under Rule 10b5-1 trading plans by top leadership at Reddit (RDDT) and C3.ai (AI). Reddit CEO Steve Huffman liquidated 17,308 shares valued at $2.8 million, while C3.ai CEO Thomas Siebel disposed of roughly 444,000 shares totaling $4.8 million on September 15-16. While pre-scheduled 10b5-1 plans insulate executives from discretionary timing scrutiny, programmatic selling into 40% trailing declines provides observable supply distribution data for tech sector positioning.
    Affected
    RDDTAI
    Transmission
    Programmatic Rule 10b5-1 executive share sales introduce recurring non-fundamental supply pressure across RDDT and AI during periods of negative 12-month momentum.

    How this development reaches the affected companies

    AssetExposure and channelDirectionEvidence
    RDDTprogrammatic insider equity disposition via Rule 10b5-1 trading planMixed1-5dReddit CEO sold 17,308 shares for $2.8 million on September 15, 2026, under pre-established plan.
    AIexecutive equity distribution via Rule 10b5-1 liquidation programMixed1-5dC3.ai CEO sold 444,000 shares worth $4.8 million on September 15-16, 2026.

    Does this development affect your holdings?

    Enter your holdings to check them against this and other recent developments, review the decision that matters most, then set a monitor.

    Check this development against my holdings

    Review your initial audit before choosing ongoing portfolio scanning at $79/month.

    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.

    No verifiable public source recorded for this card.

    Related

    Check this development against my holdings

    See today's live cards

    Public pages are published 24 hours after the product shows them. Desk shows every catalyst, event and causal reading as it happens, mapped to your holdings.

    Open Desk — $399/month