SCHEDULE: Janus Henderson Discloses 9.99% Stake in Equillium

Janus Henderson Group plc has reported a significant 9.99% beneficial ownership stake in EQUILLIUM, INC., holding over 6 million shares.

Summary

• Janus Henderson Group plc reported beneficial ownership of 6,083,239 shares of EQUILLIUM, INC. Common Stock.
• This represents 9.99% of the class of securities.
• Janus Henderson holds shared voting power and shared dispositive power over all 6,083,239 shares.
• The event requiring this filing occurred on November 28, 2025.
• The reported ownership includes certain pre-funded and/or common warrants, exercisable only up to the 9.99% beneficial ownership limit.
• An additional 12,858,179 pre-funded and 5,036,469 common warrants are not reflected in the reported figures due to the 9.99% beneficial ownership limitation.
• Janus Henderson Group plc is classified as an Investment Adviser (IA) and a Parent Holding Company (HC).
• The securities were acquired and are held in the ordinary course of business, not for the purpose of changing or influencing control of the issuer.

Sentiment

Score: 7

Explanation: The disclosure of a significant 9.99% stake by a reputable institutional investor like Janus Henderson Group plc is generally a positive indicator, suggesting confidence in the company. The explicit statement that the investment is in the ordinary course of business and not for control purposes further supports a positive, long-term view.

Positives

• A major institutional investor, Janus Henderson Group plc, has taken a significant 9.99% stake in Equillium, indicating potential confidence in the company's prospects.
• The investment is stated to be in the ordinary course of business, suggesting a long-term investment strategy rather than an activist play.

Risks

• The beneficial ownership limit of 9.99% means a substantial number of warrants (12,858,179 pre-funded and 5,036,469 common warrants) are currently unexercised, representing potential future dilution if exercised above this threshold or if the threshold is removed.

Future Outlook

NA

Management Comments

• By signing below I certify that, to the best of my knowledge and belief, the securities referred to above were acquired and are held in the ordinary course of business and were not acquired and are not held for the purpose of or with the effect of changing or influencing the control of the issuer of the securities and were not acquired and are not held in connection with or as a participant in any transaction having that purpose or effect, other than activities solely in connection with a nomination under 240.14a-11.

Industry Context

The acquisition of a significant stake by a large asset manager like Janus Henderson in a biotechnology company (implied by 'EQUILLIUM, INC.' and common stock) can signal institutional confidence in the company's drug pipeline or market position, potentially attracting further investor interest in the sector.

Comparison to Industry Standards

• A 9.99% stake is a substantial position for an institutional investor, often indicating a high conviction investment. This level of ownership is common for passive institutional investors who wish to avoid the more stringent reporting requirements and potential 'control person' implications of exceeding 10%.
• Compared to other institutional filings, Janus Henderson's disclosure of unexercised warrants (12,858,179 pre-funded and 5,036,469 common warrants) due to the 9.99% beneficial ownership cap is a notable detail, suggesting a larger potential interest if regulatory thresholds were different or if the company's stock price performance makes warrant exercise more attractive.

Stakeholder Impact

• Shareholders: The disclosure of a significant institutional investor taking a large stake could increase investor confidence and potentially lead to positive share price movement.

Key Dates

Recommendation

While the entry of a significant institutional investor like Janus Henderson is a positive signal, a Schedule 13G filing primarily reports a passive ownership stake and does not provide new operational or financial performance data for Equillium. Therefore, without additional fundamental analysis of Equillium's business, financials, and market position, a 'hold' recommendation is prudent for existing investors, while potential new investors might view this as a positive indicator for further due diligence.

Keywords

Equillium, Janus Henderson, SEC Filing, Schedule 13G, Beneficial Ownership, Common Stock, Institutional Investment, EQ, Investment Adviser, Warrants