[Disclosure] Alteogen (196170) Designated as Short-Selling Overheated Stock; Short-Selling Banned on May 19

Source Fact: Financial Supervisory Service Electronic Disclosure System (DART) / 2025-05-16

Disclosure Type: Designation as Short-Selling Overheated Stock (Short-Selling Trading Ban Applied)

💡 3-Second Summary

Alteogen has been designated as a “Short-Selling Overheated Stock” by the Korea Exchange due to a sharp surge in short-selling volume. Consequently, short-selling activities in both regular and after-hours markets will be strictly prohibited for one day on May 19, 2025.

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

• Target Stock: Alteogen (Ticker 196170)
• Designation Date (Ban Period): May 19, 2025 (Applicable for 1 trading day)
• Market Action Details: Short-selling trading is prohibited in the regular and after-hours markets on the designation date. Trading will resume under normal short-selling rules from the day after the designation date (May 20).
• Extension Condition: If the stock price drops by -5% or more on the day short-selling is banned, the short-selling restriction period will be further extended.
• Permitted Exceptions: Short-selling is exceptionally allowed for liquidity provision quotes (LP), market-making quotes, hedge trading aimed at providing liquidity for ELW, ETF, and ETN products, and market-making hedge quotes in derivatives markets.
• Special Case: If trading of the designated stock is already suspended on the designation date, no separate actions under this disclosure will be enforced.

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

This disclosure serves as an administrative marker indicating that short-selling trades targeting Alteogen have recently escalated to abnormal levels. It is a regulatory market action enforced under KOSDAQ market operational provisions, rather than an event reflecting a shift in corporate Fundamental, such as biotechnology pipeline developments or revenue revisions.

For investors, the primary metric to follow is the temporary easing of short-side supply pressures, as short-selling is blocked on the target date except for designated hedging transactions. This restriction may exert a positive potential impact by temporarily dampening short-term downward technical pressure. However, because it is a single-day administrative intervention and short-selling can resume on the following day, investors should remain objective and observe intraday price volatility to see if the -5% threshold is tested, which would trigger an extension of the ban.

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

The Korea Exchange has pulled the emergency brake on short-sellers as speculative volume hit the red zone for Alteogen! For one full session on Monday, May 19, short-selling avenues will be tightly locked down. Excluding standard corporate market-making exceptions, all eyes will be on whether this catalyst sparks brief short-covering support or just a minor breathing room for the stock. Don’t forget the built-in rule: if the stock slips past -5% on the ban day, the short-selling lock gets extended. Keep your terminals open and monitor the bidding blocks closely!

📢 Disclaimer and Source Information

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

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

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