Casper Bradford B 4

4 · U.S. SILICA HOLDINGS, INC. · Filed Apr 2, 2019

Form 4

Period: 2019-03-31

V P of Strategic Planning

Transactions

Exercise/Conversion
Common Stock
2019-03-31+9,878→ 92,761 total
Exercise/Conversion
Common Stock
2019-04-01+4,751→ 94,583 total
Exercise/Conversion
Restricted Stock Units
2019-04-01−2,607→ 2,607 total
→ Common Stock (2,607 underlying)
Exercise/Conversion
Restricted Stock Units
2019-04-01−4,751→ 9,502 total
→ Common Stock (4,751 underlying)
Exercise/Conversion
Common Stock
2019-04-01+2,607→ 90,988 total
Tax Payment
Common Stock
2019-04-01$17.25/sh−2,107$36,346→ 92,476 total
Exercise/Conversion
Restricted Stock Units
2019-03-31−9,878→ 0 total
→ Common Stock (9,878 underlying)
Tax Payment
Common Stock
2019-03-31$17.36/sh−4,380$76,037→ 88,381 total
Tax Payment
Common Stock
2019-04-01$17.25/sh−1,156$19,941→ 89,832 total

Footnotes (8)

[F1]Scheduled vesting of restricted stock units granted on March 31, 2016.
[F2]Represents tax withholding on vested restricted stock units.
[F3]Scheduled vesting of restricted stock units granted on April 1, 2017.
[F4]Scheduled vesting of restricted stock units granted on April 1, 2018.
[F5]Each restricted stock unit represents a contingent right to receive one share of common stock upon vesting of the unit.
[F6]Restricted Stock Units granted on March 31, 2016 and vesting in three equal installments on the anniversaries of the grant date.
[F7]Restricted Stock Units granted on April 1, 2017 and vesting in three equal installments on the anniversaries of the grant date.
[F8]Restricted Stock Units granted on April 1, 2018 and vesting in three equal installments on the anniversaries of the grant date.

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