Frontczak Mary L 4

4 · COMPASS MINERALS INTERNATIONAL INC · Filed Oct 17, 2024

Form 4

Period: 2024-10-15

Chief Legal Officer

Transactions

Tax Payment
Common Stock
2024-10-15$12.83/sh−5,272$67,640→ 19,957 total
Exercise/Conversion
Restricted Stock Unit
2024-10-15−1,160→ 0 total
Exp: 2024-10-15→ Common Stock (1,160 underlying)
Exercise/Conversion
Restricted Stock Unit
2024-10-15−7,333→ 14,666 total
Exp: 2026-10-15→ Common Stock (7,333 underlying)
Award
Restricted Stock Unit
2024-10-15+48,627→ 48,627 total
Exp: 2027-10-15→ Common Stock (48,627 underlying)
Exercise/Conversion
Common Stock
2024-10-15+11,699→ 25,229 total
Exercise/Conversion
Restricted Stock Unit
2024-10-15−3,206→ 3,205 total
Exp: 2025-10-15→ Common Stock (3,206 underlying)

Footnotes (7)

[F1]Represents the number of shares withheld to satisfy tax withholding obligations on the vesting and release of restricted stock units.
[F2]Each restricted stock unit represents a contingent right to receive one share of Issuer common stock.
[F3]Restricted stock units vest in three equal annual installments, beginning on the first anniversary of the grant date and ending on October 15, 2027
[F4]Each restricted stock unit represents a contingent right to receive one share of Issuer common stock. A performance hurdle tied to the Issuer's fiscal year 2022 financial performance was satisfied.
[F5]The first and second tranche of these restricted stock units vested on November 14, 2022 (the date the Compensation Committee certified achievement of the performance hurdle) and October 15, 2023, respectively. The remaining tranche vested on October 15, 2024.
[F6]Restricted stock units vest in three equal annual installments, beginning on the first anniversary of the grant date and ending on October 15, 2025.
[F7]Restricted stock units vest in three equal annual installments, beginning on the first anniversary of the grant date and ending on October 15, 2026

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