DIANTHUS THERAPEUTICS INC DNTH

* Summed across managers. Shares that two managers' reports both contain – a subsidiary's holdings that its parent's report includes too, or a sub-adviser's in its client's – are counted once ($1.1m this quarter). Holder counts are more reliable. Shares outstanding: 32.2m as of 2025-08-06, from the company's own SEC filing; the percentage can still exceed 100%: lent-out shares are counted by the lender and the buyer, and some reports overlap without saying so. Implied quarter-end price ≈ $18.63. Options: 5 managers hold calls ($2.7m notional), 3 hold puts ($571.8k).

Trends to Q2 2025

Options at notional value: the value of the shares the contracts control, as filers report them, not what the options cost. Not included in the holders, shares or buying above.

Major shareholders (over 5%)

Anyone who owns more than 5% of a class of the company's shares has to say so: on Schedule 13D if they may try to influence or control the company, on 13G if they're a passive investor, and update it as the stake changes. Each holder's latest filing, from 19 Dec 2024 on; percentages are of the share class, as the holder worked them out.

Fell to 5% or below in the last year: Sirenia Capital Management LP (3.1%, 2026-08-14), Point72 Asset Management, L.P. (1.2%, 2026-05-15), RA CAPITAL MANAGEMENT, L.P. (4.8%, 2026-05-15), Octagon Capital Advisors LP (3.6%, 2026-05-14), Fairmount Funds Management LLC (4.9%, 2025-11-25), Avidity Partners Management LP (4.9%, 2025-11-19), Deep Track Capital, LP (0.0%, 2025-11-14), BCLS Fund III Investments, LP (3.1%, 2025-11-14), Vestal Point Capital, LP (3.0%, 2025-11-14)

Insider purchases and sales in Q2 2025

Shares bought or sold by the company's own officers, directors and 10% owners, in the open market or privately, as they reported to the SEC on Form 4 (due within two business days of the trade). Grants, option exercises, shares withheld for tax and gifts aren't included.

None reported in Q2 2025.

Holders, Q2 2025