SOLARIS OILFIELD INFRASTRUCT

Ticker: SEI CUSIP: 83418M103 Class: Common Stock

Yorktown Energy Partners X, L.P.'s Holding History (CIK: 0001577919)

Note: Option positions (PUT/CALL) are excluded.

Q3 2018

Shares 10,954,234 Value ($000) $206,925 Avg Close $11.96 Range $9.66 - $14.32

Q2 2018

Shares 10,954,234 Value ($000) $156,536 Avg Close $12.37 Range $10.03 - $15.03

Q1 2018

Shares 10,954,234 Value ($000) $181,402 Avg Close $14.02 Range $11.69 - $17.86

Q4 2017

Shares 12,362,622 Value ($000) $264,684 Avg Close $12.61 Range $10.45 - $16.39

Q3 2017

Shares 15,022,823 Value ($000) $261,848 Avg Close $10.25 Range $8.22 - $13.20

Q2 2017

Shares 15,022,823 Value ($000) $173,213 Avg Close $8.45 Range $7.37 - $9.29

Period	Shares	Value ($000)	Average Close	Price Range
Q3 2018	10,954,234	$206,925	$11.96	$9.66 - $14.32
Q2 2018	10,954,234	$156,536	$12.37	$10.03 - $15.03
Q1 2018	10,954,234	$181,402	$14.02	$11.69 - $17.86
Q4 2017	12,362,622	$264,684	$12.61	$10.45 - $16.39
Q3 2017	15,022,823	$261,848	$10.25	$8.22 - $13.20
Q2 2017	15,022,823	$173,213	$8.45	$7.37 - $9.29