Lewis T. "rusty" Williams - 17 Feb 2026 Form 4 Insider Report for Protagonist Therapeutics, Inc (PTGX)

Role
Director
Signature
/s/ Matthew Gosling, Attorney-in-Fact for Lewis T. "Rusty" Williams
Issuer symbol
PTGX
Transactions as of
17 Feb 2026
Net transactions value
-$1,288,440
Form type
4
Filing time
18 Feb 2026, 18:12:56 UTC
Previous filing
06 Jan 2026
SEC
View on sec.gov

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Quoteable Key Fact

"Lewis T. "rusty" Williams filed Form 4 for Protagonist Therapeutics, Inc (PTGX) on 18 Feb 2026."

Quick Takeaways

  • This page summarizes Lewis T. "rusty" Williams's Form 4 filing for Protagonist Therapeutics, Inc (PTGX).
  • 3 reported transactions and 1 derivative row are listed below.
  • Filing timestamp: 18 Feb 2026, 18:12.

What Changed

  • Previous filing in this sequence was filed on 06 Jan 2026.
  • Current net transaction value: -$1,288,440.

Why This Matters

  • This tells you what this filing adds before you inspect full transaction and derivative tables.
  • You can trace every row back to the original SEC filing document.

Official SEC Source

Filed on Form 4

Ownership activity is grounded in SEC Form 4 disclosures.

See Original Filing

Reporting Owners (1)

Name Relationship Address Signature Signature date CIK
Williams Lewis T Director C/O PROTAGONIST THERAPEUTICS, INC., 7707 GATEWAY BLVD., SUITE 140, NEWARK /s/ Matthew Gosling, Attorney-in-Fact for Lewis T. "Rusty" Williams 18 Feb 2026 0001475714

Transactions Table

Type Sym Class Transaction Value $ Shares Change % * Price $ Shares After Date Ownership Footnotes
transaction PTGX Common Stock Options Exercise $195,120 +18,000 +230% $10.84 25,825 17 Feb 2026 Direct
transaction PTGX Common Stock Sale $1,483,560 -18,000 -70% $82.42 7,825 17 Feb 2026 Direct F1

Derivative Securities (e.g., puts, calls, warrants, options, convertible securities)

Type Sym Class Transaction Value $ Shares Change % * Price $ Shares After Date Underlying Class Amount Exercise Price Ownership Footnotes
transaction PTGX Stock Option (right to buy) Options Exercise $0 +18,000 $0.000000 6,000 17 Feb 2026 Common Stock 18,000 $10.84 Direct F2
* An asterisk sign (*) next to the price indicates that the price is likely invalid.

Explanation of Responses:

Id Content
F1 The price reported represents the weighted average sale price per share. The shares were sold in multiple transactions at prices ranging from $81.47 to $83.12. Upon request by the staff of the U.S. Securities and Exchange Commission, the Issuer, or a security holder of the Issuer, the Reporting Person will provide full information regarding the number of shares sold at each separate price.
F2 These stock options are fully vested.

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