Schedule of Investments
The 3D Printing ETF

April 30, 2021 (Unaudited)

Investments	Shares		Value
COMMON STOCKS–99.5%
Aerospace & Defense - 1.9%
Aerojet Rocketdyne Holdings, Inc.		109,478	$	5,114,812
Hexcel Corp.*		12,837		724,135
Moog, Inc., Class A		61,465		5,319,796
Total Aerospace & Defense				11,158,743
Air Freight & Logistics - 1.0%
United Parcel Service, Inc., Class B		29,471		6,007,958
Auto Components - 0.9%
Cie Generale des Etablissements Michelin SCA (France)		35,782		5,177,349
Chemicals - 0.8%
Arkema SA (France)		5,754		719,449
DuPont de Nemours, Inc.		9,346		720,670
Eastman Chemical Co.		6,288		725,572
Evonik Industries AG (Germany)		19,819		693,857
Koninklijke DSM NV (Netherlands)		4,048		726,116
Toray Industries, Inc. (Japan)		113,608		706,035
Total Chemicals				4,291,699
Commercial Services & Supplies - 0.1%
PyroGenesis Canada, Inc. (Canada)*		135,921		694,451
Electrical Equipment - 1.5%
AMETEK, Inc.		57,349		7,738,101
SGL Carbon SE (Germany)*		95,695		712,158
Total Electrical Equipment				8,450,259
Electronic Equipment, Instruments & Components - 11.7%
FARO Technologies, Inc.*		91,367		6,929,730
Hexagon AB, Class B (Sweden)		76,457		7,292,070
Renishaw PLC (United Kingdom)		312,935		27,075,885
Trimble, Inc.*		318,956		26,154,392
Total Electronic Equipment, Instruments & Components				67,452,077
Health Care Equipment & Supplies - 9.2%
Align Technology, Inc.*		12,564		7,482,239
Medtronic PLC		42,065		5,507,150
NuVasive, Inc.*		76,774		5,485,502
Straumann Holding AG (Switzerland)		20,570		29,382,497
Stryker Corp.		20,618		5,414,905
Total Health Care Equipment & Supplies				53,272,293
Industrial Conglomerates - 1.9%
3M Co.		3,540		697,876
General Electric Co.		390,609		5,124,790
Siemens AG (Germany)		31,591		5,272,446
Total Industrial Conglomerates				11,095,112
Machinery - 18.0%
Desktop Metal, Inc., Class A*		1,094,181		14,968,396
ExOne Co. (The)*†		1,488,995		34,619,134
Lincoln Electric Holdings, Inc.		43,021		5,508,839
OC Oerlikon Corp. AG (Switzerland)		456,360		5,331,904
Proto Labs, Inc.*		129,627		14,526,002
Sandvik AB (Sweden)		25,647		634,089
SLM Solutions Group AG (Germany)*†		1,268,303		28,453,219
Total Machinery				104,041,583
Metals & Mining - 2.3%
Allegheny Technologies, Inc.*		32,506		756,089
Arconic Corp.*		192,826		5,514,824
Carpenter Technology Corp.		17,255		653,447
Kaiser Aluminum Corp.		46,475		5,598,843
voestalpine AG (Austria)		16,354		709,787
Total Metals & Mining				13,232,990
Professional Services - 0.9%
Bertrandt AG (Germany)		93,907		5,199,054
Semiconductors & Semiconductor Equipment - 0.9%
Ultra Clean Holdings, Inc.*		96,630		4,934,894
Software - 28.4%
Altair Engineering, Inc., Class A*		424,931		27,620,515
ANSYS, Inc.*		69,863		25,546,105
Autodesk, Inc.*		87,564		25,560,807
Dassault Systemes SE (France)		114,339		26,523,811
Materialise NV (Belgium)*(a)		332,738		9,955,521
Microsoft Corp.		100,851		25,432,605
PTC, Inc.*		177,367		23,224,435
Total Software				163,863,799
Technology Hardware, Storage & Peripherals - 20.0%
3D Systems Corp.*		1,320,738		28,448,697
Eastman Kodak Co.*		99,237		740,308
HP, Inc.		825,499		28,157,771
MGI Digital Graphic Technology (France)*†		463,901		27,328,647
Nano Dimension Ltd. (Israel)*(a)		1,934,283		14,197,637
Stratasys Ltd.*		720,086		16,137,127
Xerox Holdings Corp.		29,125		703,078
Total Technology Hardware, Storage & Peripherals				115,713,265
Total Common Stocks
(Cost $641,971,635)				574,585,526
PREFERRED STOCK–0.1%
Household Products - 0.1%
Henkel AG & Co. KGaA (Germany) (Cost $668,630)		6,177		709,660
MONEY MARKET FUND–0.6%
Dreyfus Government Cash Management Fund, Institutional Shares, 0.03% (b)
(Cost $3,424,058)		3,424,058		3,424,058
Total Investments–100.2%
(Cost $646,064,323)				578,719,244
Liabilities in Excess of Other Assets–(0.2)%				(​1,260,081	)
Net Assets–100.0%			$	577,459,163

Schedule of Investments (continued)

The 3D Printing ETF

April 30, 2021 (Unaudited)

Affiliated Issuer Transactions

A summary of the Fund’s transactions with affiliated issuers during the period ended April 30, 2021 is as follows:

Value ($) at 7/31/2020		Purchases Cost ($)		Sales Proceeds ($)			Net Realized Gain/(Loss) ($)		Net Change in Unrealized Appreciation (Depreciation) ($)			Dividend Income ($)		Capital Gain Distributions ($)		Number of Shares at 4/30/2021		Value ($) at 4/30/2021
Common Stocks — 15.6%
Machinery — 10.9%
ExOne (The) Co.
2,089,567			58,624,908		(9,989,922	)		6,585,555		(22,690,974	)		–		–		1,488,995		34,619,134
SLM Solutions Group AG
2,127,620			34,584,008		(8,672,618	)		1,947,661		(1,533,452	)		–		–		1,268,303		28,453,219
Technology Hardware, Storage & Peripherals — 4.7%
MGI Digital Graphic Technology
2,127,889			32,525,692		(4,553,633	)		436,411		(3,207,712	)		–		–		463,901		27,328,647
$	6,345,076	$	125,734,608	$	(23,216,173	)	$	8,969,627	$	(27,432,138	)	$	–	$	–		3,221,199	$	90,401,000

*	Non-income producing security
†	Affiliated security
(a)	American Depositary Receipt
(b)	Rate shown represents annualized 7-day yield as of April 30, 2021.

Fair Value Measurement

The Fund discloses the fair value of its investments in a hierarchy that distinguishes between: (i) market participant assumptions developed based on market data obtained from sources independent of the Fund (observable inputs) and (ii) the Fund’s own assumptions about market participant assumptions developed based on the best information available under the circumstances (unobservable inputs). The three levels defined by the hierarchy are as follows:

• Level 1 — Quoted prices in active markets for identical assets.

• Level 2 — Other significant observable inputs (including quoted prices for similar securities, interest rates, prepayment speeds, credit risk, etc.).

• Level 3 — Significant unobservable inputs (including each Fund’s own assumptions in determining the fair value of investments).

The inputs or methodology used for valuing securities are not necessarily an indication of the risk associated with investing in those securities.

The following is a summary of the valuations as of April 30, 2021, based upon the three levels defined above:

The 3D Printing ETF	Level 1		Level 2		Level 3		Total
Assets
Common Stocks‡	$	574,585,526	$	–	$	–	$	574,585,526
Preferred Stock‡		709,660		–		–		709,660
Money Market Fund		3,424,058		–		–		3,424,058
Total	$	578,719,244	$	–	$	–	$	578,719,244

‡ Please refer to the Schedule of Investments to view securities segregated by industry type.