[Disclosure] Celltrion (068270) Stock Futures & Options Market Measures Scheduled Following Bonus Issue (Effective June 9)

Source Fact: Financial Supervisory Service DART / 2025-05-28

Disclosure Type: Investment Warning for Stock Futures and Options

💡 3-Second Summary

Following its bonus issue decision, KOSCOM has announced scheduled market measures for Celltrion (068270) stock futures and options, outlining the formulas for downward adjustments of reference prices and upward revisions of trading multipliers on the ex-rights date (June 9).

📊 1. [Key Disclosure Details & Major Figures]

• Underlying Asset: Celltrion (068270) Common Shares
• Reason for Adjustment: Celltrion (068270)’s bonus issue decision (Approved by the Board of Directors on May 26, 2025)
• Scheduled Effective Date: June 09, 2025 (Monday, the ex-rights date of the underlying stock)
• Scheduled Formulas for Market Measures:
  • Reference Price & Options Strike Price Adjustments: Applies to all expiration months
    • $\text{Adjusted Reference (Strike) Price} = \text{Previous Price} \times \frac{\text{Adjusted Reference Price of Underlying Stock}}{\text{Closing Price of Underlying Stock on the Day Prior to Ex-Rights}}$
  • Trading Multiplier Adjustments: Applies to Futures (All contracts with outstanding open interest after the market close on June 5, 2025) and Options (All expiration months)
    • $\text{Adjusted Trading Multiplier} = \text{Previous Multiplier} \times \frac{\text{Closing Price of Underlying Stock on the Day Prior to Ex-Rights}}{\text{Adjusted Reference Price of Underlying Stock}}$
  • Delisting of Futures Calendar Spreads: Certain spread contracts will be delisted because the trading multipliers for the near-month and far-month contracts will differ following the adjustments.
  • Special Listings of Standard Options: New options contracts with the standard trading multiplier of 10 will be introduced separately from the adjusted contracts to maintain market standardization (9 or more for near-month to 3rd-month contracts, 3 or more for 4th-month to 6th-month contracts).
• Additional Key Schedule:
  • The exact figures and final calculations will be formally determined and announced on the trading day prior to the ex-rights date, June 05, 2025 (Thursday).
  • This adjustment timeline is subject to change depending on the actual progress of Celltrion (068270)’s bonus issue procedures.

📈 2. [Expert Perspective: What This Means for Investors]

This regulatory notification acts as an advance warning and mathematical blueprint, detailing how the Korea Exchange (KRX) plans to realign the derivatives market with the cosmetic price adjustments of the underlying spot equity. When the bonus issue occurs, the spot price naturally undergoes a downward adjustment (ex-rights) to account for the increased share count. To maintain economic neutrality and protect existing contract holders from arbitrary value shifts, the exchange will execute balancing procedures by proportionately lowering pricing metrics and scaling up the transaction unit size (trading multiplier).

A closer look at the adjustment formulas reveals that the reference prices and strike prices are multiplied by the adjustment ratio, whereas the trading multiplier is adjusted by the reciprocal of that same ratio. This ensures that the total capital value of an open position remains constant before and after the ex-rights date. Consequently, these measures are purely administrative and technical adjustments that preserve the contract’s intrinsic economic value.

However, derivatives market participants must prepare for the delisting of specific calendar spreads where different contract legs carry mismatched trading multipliers, preventing accurate arbitrage pricing. Furthermore, as new options series with the standard multiplier of 10 will be launched alongside the customized, adjusted strike series, traders operating after June 9 must exercise strict diligence to avoid order entry errors across different contract specifications.

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

This preliminary market measures disclosure serves as a practical reminder for derivatives traders to proactively manage portfolio exposure ahead of Celltrion (068270)’s upcoming ex-rights event. Since the ex-rights date of June 9 will simultaneously lower underlying spot prices and trigger complex contract scale adjustments in the futures and options markets, participants should carefully evaluate how these structural changes affect their open positions.

For global investors, the primary variable to track is the follow-up disclosure scheduled for June 05, 2025. This upcoming report will finalize the exact mathematical parameters, including the closing price prior to ex-rights, the official adjusted baseline price, the finalized trading multiplier value carried out to eight decimal places, and the precise futures reference prices for all contract months.

Specifically, institutional investors managing significant derivatives portfolios must audit how the decimal-shifted trading multipliers impact their internal risk models, portfolio valuations, and margin calculations. Furthermore, for those utilizing calendar spreads scheduled for delisting, it is highly recommended to proactively adjust or liquidate these positions prior to June 5 to mitigate unexpected execution and liquidity risks during the transition.

📢 Disclaimer & Source

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

Investment Risk Warning: This content is provided for informational and linguistic reference purposes only. Under no circumstances does it constitute financial advice or a recommendation to buy or sell any specific stock. All investment decisions and financial responsibilities rest solely with the investor.

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