Eckert Celia 4

4 · Xencor Inc · Filed Mar 4, 2026

Form 4

Period: 2026-03-02

SVP, GENERAL COUNSEL

Transactions

Award
Common Stock
[F1][F2]
2026-03-02+18,680→ 83,421 total
Sale
Common Stock
[F3]
2026-03-03$11.90/sh−1,492$17,747→ 81,929 total
Award
Stock Option (Right to Buy)
[F4]
2026-03-02+112,080→ 112,080 total
Exercise: $12.30Exp: 2036-03-02→ Common Stock (112,080 underlying)

Footnotes (4)

[F1]Represents restricted stock units that vest as follows: 1/3 of the shares vest on the first, second and third anniversaries of the date of grant, subject to the Reporting Person's continuous service to the Issuer on and through each applicable vesting date, inclusive.
[F2]Includes the following shares acquired by the Reporting Person pursuant to the Issuer's Employee Stock Purchase Plan: 977 shares acquired on June 10, 2025 and 257 shares on December 10, 2025.
[F3]Represents the disposition of shares that were sold to pay withholding taxes upon vesting of 3,502 restricted stock units.
[F4]25% of the shares subject to the option shall vest on the one year anniversary of March 2, 2026 (the "Vesting Commencement Date"), and 1/48th of the shares shall vest monthly thereafter, such that the option shall be fully vested and exercisable on the four year anniversary of the Vesting Commencement Date, subject to the Reporting Person's continuous service to the Issuer on and through each applicable vesting date, inclusive.

Signature

/s/ Celia E. Eckert, Attorney-in-Fact|2026-03-04

Documents

1 file