U.S. SILICA HOLDINGS, INC. 4

4 · U.S. SILICA HOLDINGS, INC. · Filed Feb 13, 2015

Form 4

Period: 2015-02-11

VP of Supply Chain

Transactions

Exercise/Conversion
Common Stock
2015-02-11+956→ 11,589 total
Tax Payment
Common Stock
2015-02-11$28.70/sh−360$10,332→ 11,229 total
Exercise/Conversion
Restricted Stock Units
2015-02-11−956→ 1,911 total
→ Common Stock (956 underlying)
Award
Employee Stock Option (Right to buy)
2015-02-12+8,251→ 8,251 total
Exercise: $28.70Exp: 2025-02-12→ Common Stock (8,251 underlying)
Award
Restricted Stock Units
2015-02-12+3,299→ 3,299 total
→ Common Stock (3,299 underlying)

Footnotes (6)

[F1]Scheduled vesting of restricted stock units granted February 11, 2014.
[F2]Tax withholding on vested restricted stock units.
[F3]Each restricted stock unit represents a contingent right to receive one share of common stock upon vesting of the unit.
[F4]Restricted Stock Units granted on February 11, 2014 and vesting in three equal installments on the anniversary date of the grant.
[F5]Option grant dated February 12, 2015, vesting in three equal annual installments on the anniversaries of the grant date.
[F6]Restricted Stock Units granted on February 12, 2015 and vesting in three equal installments on the anniversaries of the grant date.

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