Zung Jonathan B. 4

4 · CURIS INC · Filed Mar 23, 2026

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Updated Mar 23, 2026

Curis (CRIS) CDO Jonathan Zung Converts Preferred into 66,667 Shares

What Happened

Jonathan B. Zung, Chief Development Officer of Curis, converted Series B Convertible Non-Redeemable Preferred Stock into common stock. The filing shows an acquisition of 66,667 common shares resulting from the automatic conversion of the Series B preferred securities on March 20, 2026. The conversion was made at no additional consideration under the Certificate of Designations.
The footnote indicates each Series B preferred share converted into 1,333.33 common shares and that the Securities (one Series B preferred share plus associated Series A, B and C warrants) were originally sold to the reporting person at $1,000 per Security. The conversion reflects roughly 50 Securities (50 × $1,000 = $50,000 original purchase price).

Key Details

Transaction date: March 20, 2026; reported on Form 4 filed March 23, 2026 (timely).
Conversion ratio: 1,333.33 common shares per Series B preferred share; filing reports 66,667 common shares acquired (reflecting conversion of ~50 Series B preferred shares).
Consideration: conversion was automatic and for no additional consideration; original Securities were purchased at $1,000 per Security (per footnote).
Related entries: the Form 4 also lists a disposition entry for 50 derivative shares (this corresponds to the Series B preferred securities that were converted).
Shares owned after the transaction: not specified in the provided excerpt of the filing.
Not marked as a gift, sale, or 10b5-1 plan; coded as conversion of a derivative security (code C).

Context

This is a conversion of preferred stock into common stock (a non-cash corporate action), not an open-market buy or sale; such conversions change share count but do not necessarily signal a personal purchase or sale decision.
The Securities included warrants (per the footnote); this filing documents the preferred-to-common conversion specifically.

Form 4

Period: 2026-03-20

CDO

Transactions

Conversion
Common Stock
[F1]
2026-03-20+66,667→ 66,667 total
Conversion
Series B Convertible Preferred Stock
[F1]
2026-03-20−50→ 0 total
→ Common Stock (66,667 underlying)

Footnotes (1)

[F1]Each share of Series B Convertible Non-Redeemable Preferred Stock ("Series B Preferred Stock") automatically converted into 1,333.33 shares of Common Stock, for no additional consideration, at 5 p. m. Eastern Time on March 20, 2026, subject to the terms of the Certificate of Designations, Preferences and Rights of Series B Convertible Non-Redeemable Preferred Stock of Curis, Inc. (the "Certificate of Designations") and subject to the applicable Beneficial Ownership Limitations (as defined in the Certificate of Designations). Each share of Series B Preferred Stock was sold together with a Series A Warrant to purchase 1,333.33 shares of Common Stock, a Series B Warrant to purchase 1,333.33 shares of Common Stock and a Series C Warrant to purchase 1,333.33 shares of Common Stock (collectively, a "Security"). The Securities were sold at a purchase price of $1,000.00 per Security to the Reporting Person.

Signature

/s/ Diantha Duvall, Attorney-in-fact|2026-03-23

1 file