[Disclosure] Celltrion (068270) Announces Stock Futures and Options Market Adjustments Following Bonus Issue Decision

Fact Source: Financial Supervisory Service DART / 2026-06-02

Disclosure Type: Guide on Market Measures for Stock Futures and Options

💡 3-Second Summary

Following Celltrion’s bonus issue decision, the Korea Exchange is adjusting the reference prices and contract multipliers (from 10 to 10.49272103) for all of Celltrion’s stock futures and options, effective June 4, 2026.

📊 1. [Summary of Key Disclosure Content and Figures]

• Adjustment Trigger: Board resolution on Celltrion’s bonus issue on May 21, 2026
• Effective Date: June 4, 2026
• Underlying Asset: Celltrion Common Stock
• Key Adjustments:
  • Futures Reference Price Modifications (For all active contracts listed on June 2, 2026):
    • June 2026 Contract: KRW 178,700
    • July 2026 Contract: KRW 180,600
    • August 2026 Contract: KRW 180,000
    • September 2026 Contract: KRW 180,500
    • December 2026 Contract: KRW 182,000
    • March 2027 Contract: KRW 182,900
  • Contract Multiplier Adjustments (June & July 2026 Futures, and All Options):
    • Adjusted Contract Multiplier: 10.49272103 (increased from the standard multiplier of 10)
  • Delisting of Futures Spread Contracts: Due to the discrepancy in multipliers between different contract months, calendar spreads between the June 2026 contract and other outer months (August, September, December 2026, and March 2027) will be delisted.
  • Special Option Strike Prices: New option contracts with the standard multiplier of 10 will be newly listed to avoid confusion with the adjusted strike prices.

📈 2. [Professional Insight: What This Disclosure Means for Investors]

• Reflecting the Ex-Dividend/Ex-Rights Drop in Derivatives: Because a bonus issue dilutes the share price by introducing new outstanding float, an “ex-rights” price drop occurs in the spot market. This derivatives market adjustment scales down the reference price of futures and options contracts while scaling up the contract multiplier, ensuring that the structural value of derivatives matches the spot equity.
• Preservation of Portfolio Value: The increase in the multiplier to approximately 10.49 and the proportional downward adjustment of the reference prices mean that the total dollar-value of outstanding positions for existing long or short derivative holders remains completely unchanged. However, calendar-spread traders must account for the temporary delisting of certain spread contracts, which may restrict automatic roll-over orders.
• Caution Against Operational Errors: Following the adjustment, older contracts with fractional multipliers (10.49272103) will trade alongside newly introduced standard contracts with a multiplier of 10. Global participants must verify the exact contract specs and multiplier values of their orders to prevent execution mismatches.

📝 Editor’s Comment (by K-STOCK Editor)

This administrative disclosure maps the corporate action of Celltrion’s bonus issue directly into the KRX derivatives trading landscape. By adjusting the futures base prices down to the KRW 170k-180k range and expanding the multiplier to ~10.49, the exchange perfectly insulates existing derivatives positions from artificial losses. The most critical operational takeaway for global macro desks is the delisting of the June 2026 calendar spreads. Since standard roll-over orders linking June to farther-out months will not be available, portfolio managers must manually unwind and rebuild their positions. Paying close attention to the structural mix of adjusted fractional contracts and newly issued standard contracts will be essential for execution accuracy starting June 4.

📢 Disclaimer & Source Information

Source: This content has been structured and newly written based on official disclosure data submitted to the Financial Supervisory Service’s Electronic Disclosure System (DART).

Investment Risk Advisory: This information is provided solely for informational and linguistic reference purposes. Under no circumstances does it constitute financial advice, solicitation, or a recommendation to buy or sell any specific stock. All investment decisions and financial liabilities rest entirely with the individual investor.

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