Exhibit 99.1

United States Commodity Index Funds Trust

United States Commodity Index Fund

Monthly Account Statement

For the Month Ended February 28, 2019

Statement of Income (Loss)
Income
Realized Trading Gain (Loss) on Futures	$	3,772,164
Unrealized Gain (Loss) on Market Value of Futures		3,029,344
Dividend Income		37,016
Interest Income		814,440
ETF Transaction Fees		1,400
Total Income (Loss)	$	7,654,364
Expenses
Management Fees	$	285,774
Professional Fees		51,102
Brokerage Commissions		39,789
Non-interested Directors' Fees and Expenses		4,318
Prepaid Insurance Expense		2,541
Total Expenses	$	383,524
Net Income (Loss)	$	7,270,840

Statement of Changes in Net Asset Value
Net Asset Value Beginning of Month 2/1/19	$	463,980,813
Withdrawals (200,000 Shares)		(7,805,512	)
Net Income (Loss)		7,270,840
Net Asset Value End of Month	$	463,446,141
Net Asset Value Per Share (11,800,000 Shares)	$	39.28

To the Shareholders of United States Commodity Index Fund:

Pursuant to Rule 4.22(h) under the Commodity Exchange Act, the undersigned represents that, to the best of his knowledge and belief, the information contained in the Account Statement for the month ended February 28, 2019 is accurate and complete.

/s/ Stuart P. Crumbaugh               

Stuart P. Crumbaugh

Chief Financial Officer

United States Commodity Funds LLC, Sponsor of United States Commodity Index Fund

United States Commodity Funds LLC

1850 Mt. Diablo Boulevard, Suite 640

Walnut Creek, CA 94596

United States Commodity Index Funds Trust

United States Copper Index Fund

Monthly Account Statement

For the Month Ended February 28, 2019

Statement of Income (Loss)
Income
Realized Trading Gain (Loss) on Futures	$	(26,375	)
Unrealized Gain (Loss) on Market Value of Futures		604,913
Dividend Income		1,511
Interest Income		17,328
ETF Transaction Fees		350
Total Income (Loss)	$	597,727
Expenses
Management Fees	$	5,328
Professional Fees		7,519
Brokerage Commissions		226
Non-interested Directors' Fees and Expenses		99
Prepaid Insurance Expense		64
Total Expenses		13,236
Expense Waiver		(6,677	)
Net Expenses	$	6,559
Net Income (Loss)	$	591,168

Statement of Changes in Net Asset Value
Net Asset Value Beginning of Month 2/1/19	$	10,454,838
Additions (50,000 Shares)		921,236
Net Income (Loss)		591,168
Net Asset Value End of Month	$	11,967,242
Net Asset Value Per Share (650,000 Shares)	$	18.41

To the Shareholders of United States Copper Index Fund:

Pursuant to Rule 4.22(h) under the Commodity Exchange Act, the undersigned represents that, to the best of his knowledge and belief, the information contained in the Account Statement for the month ended February 28, 2019 is accurate and complete.

/s/ Stuart P. Crumbaugh               

Stuart P. Crumbaugh

Chief Financial Officer

United States Commodity Funds LLC, Sponsor of United States Copper Index Fund

United States Commodity Funds LLC

1850 Mt. Diablo Boulevard, Suite 640

Walnut Creek, CA 94596

United States Commodity Index Funds Trust

Monthly Account Statement

For the Month Ended February 28, 2019

Statement of Income (Loss)
Income
Realized Trading Gain (Loss) on Futures	$	3,745,789
Unrealized Gain (Loss) on Market Value of Futures		3,634,257
Dividend Income		38,527
Interest Income		831,768
ETF Transaction Fees		1,750
Total Income (Loss)	$	8,252,091
Expenses
Management Fees	$	291,102
Professional Fees		58,621
Brokerage Commissions		40,015
Non-interested Directors' Fees and Expenses		4,417
Prepaid Insurance Expense		2,605
Total Expenses		396,760
Expense Waiver		(6,677	)
Net Expenses	$	390,083
Net Income (Loss)	$	7,862,008

Statement of Changes in Net Asset Value
Net Asset Value Beginning of Month 2/1/19	$	474,435,651
Additions (50,000 Shares)		921,236
Withdrawals (200,000 Shares)		(7,805,512	)
Net Income (Loss)		7,862,008
Net Asset Value End of Month	$	475,413,383

To the Shareholders of the Series of the United States Commodity Index Funds Trust:

Pursuant to Rule 4.22(h) under the Commodity Exchange Act, the undersigned represents that, to the best of his knowledge and belief, the information contained in the Account Statement for the month ended February 28, 2019 is accurate and complete.

/s/ Stuart P. Crumbaugh               

Stuart P. Crumbaugh

Chief Financial Officer

United States Commodity Funds LLC, Sponsor of United States Commodity Index Funds Trust

United States Commodity Funds LLC

1850 Mt. Diablo Boulevard, Suite 640

Walnut Creek, CA 94596