First Trust Mid Cap Growth AlphaDEX® Fund (FNY)

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Holdings

Holdings of the Fund as of 5/29/2020
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Total Number of Holdings (excluding cash): 225

Security Name	Identifier	Classification	Shares / Quantity	Market Value	Weighting
Enphase Energy, Inc.	ENPH	Information Technology	54,658	$3,180,549.02	1.05%
Quidel Corporation	QDEL	Health Care	18,045	$3,157,875.00	1.04%
MongoDB, Inc.	MDB	Information Technology	12,926	$3,000,253.86	0.99%
Moderna, Inc.	MRNA	Health Care	47,143	$2,899,294.50	0.96%
Zillow Group, Inc. (Class C)	Z	Communication Services	48,998	$2,841,394.02	0.94%
Zscaler, Inc.	ZS	Information Technology	28,999	$2,844,511.91	0.94%
Inphi Corporation	IPHI	Information Technology	22,293	$2,801,561.31	0.93%
The Boston Beer Company, Inc.	SAM	Consumer Staples	4,802	$2,711,833.46	0.90%
Catalent, Inc.	CTLT	Health Care	33,973	$2,640,721.29	0.87%
Avalara, Inc.	AVLR	Information Technology	23,658	$2,532,825.48	0.84%
SiteOne Landscape Supply, Inc.	SITE	Industrials	23,973	$2,548,569.63	0.84%
BJ's Wholesale Club Holdings, Inc.	BJ	Consumer Staples	69,294	$2,494,584.00	0.82%
BlackLine, Inc.	BL	Information Technology	33,547	$2,492,542.10	0.82%
Smartsheet Inc. (Class A)	SMAR	Information Technology	42,518	$2,451,587.88	0.81%
The Scotts Miracle-Gro Company	SMG	Materials	17,236	$2,457,336.52	0.81%
Chegg, Inc.	CHGG	Consumer Discretionary	39,461	$2,410,277.88	0.80%
Everbridge, Inc.	EVBG	Information Technology	16,594	$2,427,038.44	0.80%
Five9, Inc.	FIVN	Information Technology	23,083	$2,405,248.60	0.80%
Pool Corporation	POOL	Consumer Discretionary	8,970	$2,413,109.40	0.80%
Carvana Co.	CVNA	Consumer Discretionary	25,629	$2,382,984.42	0.79%
Masimo Corporation	MASI	Health Care	9,964	$2,393,253.16	0.79%
Repligen Corporation	RGEN	Health Care	18,282	$2,394,393.54	0.79%
Zynga Inc.	ZNGA	Communication Services	257,652	$2,357,515.80	0.78%
Qualys, Inc.	QLYS	Information Technology	20,288	$2,339,612.16	0.77%
Tandem Diabetes Care, Inc.	TNDM	Health Care	27,426	$2,280,471.90	0.75%
TopBuild Corp.	BLD	Consumer Discretionary	19,709	$2,260,425.21	0.75%
Medpace Holdings, Inc.	MEDP	Health Care	24,051	$2,232,413.82	0.74%
Ultragenyx Pharmaceutical Inc.	RARE	Health Care	31,779	$2,175,590.34	0.72%
Alteryx, Inc. (Class A)	AYX	Information Technology	14,836	$2,135,493.84	0.71%
Ares Management Corporation (Class A)	ARES	Financials	57,062	$2,154,661.12	0.71%
CRISPR Therapeutics AG	CRSP	Health Care	33,292	$2,149,997.36	0.71%
Strategic Education, Inc.	STRA	Consumer Discretionary	12,629	$2,142,257.27	0.71%
Advanced Drainage Systems, Inc.	WMS	Industrials	47,960	$2,126,546.40	0.70%
Generac Holdings Inc.	GNRC	Industrials	18,943	$2,107,787.61	0.70%
Trex Company, Inc.	TREX	Industrials	17,618	$2,116,274.16	0.70%
ACADIA Pharmaceuticals Inc.	ACAD	Health Care	41,773	$2,075,282.64	0.69%
CACI International Inc.	CACI	Information Technology	8,358	$2,096,019.24	0.69%
LHC Group, Inc.	LHCG	Health Care	12,589	$2,045,838.39	0.68%
Cable One, Inc.	CABO	Communication Services	1,074	$2,026,519.86	0.67%
Exelixis, Inc.	EXEL	Health Care	81,993	$2,026,047.03	0.67%
Neurocrine Biosciences, Inc.	NBIX	Health Care	16,313	$2,035,209.88	0.67%
Charles River Laboratories International, Inc.	CRL	Health Care	11,188	$2,010,036.08	0.66%
RenaissanceRe Holdings Ltd.	RNR	Financials	11,820	$1,984,105.20	0.66%
Teladoc Health, Inc.	TDOC	Health Care	11,386	$1,981,847.16	0.66%
Bio-Rad Laboratories, Inc. (Class A)	BIO	Health Care	4,028	$1,979,036.96	0.65%
Tetra Tech, Inc.	TTEK	Industrials	24,992	$1,971,868.80	0.65%
Acceleron Pharma Inc.	XLRN	Health Care	19,638	$1,940,823.54	0.64%
Cannae Holdings, Inc.	CNNE	Financials	52,700	$1,940,941.00	0.64%
Chemed Corporation	CHE	Health Care	4,075	$1,949,928.25	0.64%
Deckers Outdoor Corporation	DECK	Consumer Discretionary	10,537	$1,923,318.61	0.64%
Nuance Communications, Inc.	NUAN	Information Technology	84,144	$1,925,214.72	0.64%
The Toro Company	TTC	Industrials	27,115	$1,927,063.05	0.64%
Axon Enterprise Inc.	AAXN	Industrials	24,939	$1,894,366.44	0.63%
Entegris, Inc.	ENTG	Information Technology	31,538	$1,888,495.44	0.62%
Penumbra, Inc.	PEN	Health Care	10,940	$1,886,274.80	0.62%
Amedisys, Inc.	AMED	Health Care	9,616	$1,846,752.80	0.61%
Guardant Health, Inc.	GH	Health Care	20,286	$1,833,651.54	0.61%
Churchill Downs Incorporated	CHDN	Consumer Discretionary	13,715	$1,819,569.05	0.60%
Exponent, Inc.	EXPO	Industrials	24,544	$1,822,146.56	0.60%
Horizon Therapeutics Plc	HZNP	Health Care	35,751	$1,813,648.23	0.60%
RealPage, Inc.	RP	Information Technology	26,675	$1,809,098.50	0.60%
Simpson Manufacturing Co., Inc.	SSD	Industrials	22,780	$1,823,766.80	0.60%
The New York Times Company (Class A)	NYT	Communication Services	45,976	$1,803,638.48	0.60%
Cabot Microelectronics Corporation	CCMP	Information Technology	12,371	$1,792,063.06	0.59%
FTI Consulting, Inc.	FCN	Industrials	14,736	$1,775,098.56	0.59%
Helen of Troy Limited	HELE	Consumer Discretionary	9,803	$1,783,361.76	0.59%
Nevro Corp.	NVRO	Health Care	14,122	$1,773,723.20	0.59%
RPM International Inc.	RPM	Materials	23,730	$1,774,529.40	0.59%
Dropbox, Inc. (Class A)	DBX	Information Technology	78,007	$1,760,617.99	0.58%
Lumentum Holdings Inc.	LITE	Information Technology	23,947	$1,755,794.04	0.58%
Mercury Systems, Inc.	MRCY	Industrials	19,791	$1,768,325.85	0.58%
Monolithic Power Systems, Inc.	MPWR	Information Technology	8,431	$1,768,402.25	0.58%
XPO Logistics, Inc.	XPO	Industrials	21,722	$1,711,910.82	0.57%
CyrusOne Inc.	CONE	Real Estate	22,866	$1,699,858.44	0.56%
NeoGenomics, Inc.	NEO	Health Care	63,923	$1,706,104.87	0.56%
QTS Realty Trust, Inc. (Class A)	QTS	Real Estate	24,339	$1,669,655.40	0.55%
Cogent Communications Holdings, Inc.	CCOI	Communication Services	21,531	$1,647,552.12	0.54%
Momenta Pharmaceuticals, Inc.	MNTA	Health Care	51,909	$1,634,095.32	0.54%
Sarepta Therapeutics, Inc.	SRPT	Health Care	10,825	$1,648,322.75	0.54%
HubSpot, Inc.	HUBS	Information Technology	7,951	$1,589,722.94	0.53%
PTC Therapeutics, Inc.	PTCT	Health Care	31,651	$1,605,022.21	0.53%
Cirrus Logic, Inc.	CRUS	Information Technology	21,514	$1,559,334.72	0.52%
Paylocity Holding Corporation	PCTY	Information Technology	11,989	$1,558,629.97	0.52%
CoreSite Realty Corporation	COR	Real Estate	12,182	$1,520,557.24	0.50%
Neogen Corporation	NEOG	Health Care	21,076	$1,501,032.72	0.50%
Ormat Technologies, Inc.	ORA	Utilities	20,868	$1,519,399.08	0.50%
RH	RH	Consumer Discretionary	7,027	$1,524,086.03	0.50%
Select Medical Holdings Corporation	SEM	Health Care	94,129	$1,519,242.06	0.50%
Aerojet Rocketdyne Holdings, Inc.	AJRD	Industrials	33,755	$1,480,156.75	0.49%
Cohen & Steers, Inc.	CNS	Financials	23,299	$1,480,651.45	0.49%
Etsy, Inc.	ETSY	Consumer Discretionary	18,365	$1,487,197.70	0.49%
Fortune Brands Home & Security, Inc.	FBHS	Industrials	24,484	$1,492,544.64	0.49%
Nordson Corporation	NDSN	Industrials	7,840	$1,476,664.00	0.49%
Balchem Corporation	BCPC	Materials	14,303	$1,439,596.95	0.48%
American States Water Company	AWR	Utilities	17,274	$1,416,640.74	0.47%
NovoCure Limited	NVCR	Health Care	20,967	$1,413,804.81	0.47%
Pegasystems Inc.	PEGA	Information Technology	14,866	$1,414,053.92	0.47%
White Mountains Insurance Group Ltd.	WTM	Financials	1,552	$1,420,949.12	0.47%
Zendesk, Inc.	ZEN	Information Technology	16,543	$1,418,562.25	0.47%
Black Knight, Inc.	BKI	Information Technology	18,239	$1,404,038.22	0.46%
Cloudera, Inc.	CLDR	Information Technology	134,555	$1,379,188.75	0.46%
Morningstar, Inc.	MORN	Financials	9,110	$1,396,745.20	0.46%
Watts Water Technologies, Inc.	WTS	Industrials	16,679	$1,387,025.64	0.46%
BWX Technologies, Inc.	BWXT	Industrials	21,740	$1,360,271.80	0.45%
Carlisle Companies Incorporated	CSL	Industrials	11,270	$1,350,822.20	0.45%
Commerce Bancshares, Inc.	CBSH	Financials	21,032	$1,340,369.36	0.44%
PRA Health Sciences, Inc.	PRAH	Health Care	12,753	$1,319,935.50	0.44%
Genpact Limited	G	Information Technology	36,265	$1,303,726.75	0.43%
Power Integrations, Inc.	POWI	Information Technology	11,988	$1,298,899.80	0.43%
Bruker Corporation	BRKR	Health Care	29,530	$1,278,058.40	0.42%
Gentex Corporation	GNTX	Consumer Discretionary	47,786	$1,263,461.84	0.42%
RLI Corp.	RLI	Financials	16,057	$1,267,860.72	0.42%
UniFirst Corporation	UNF	Industrials	7,009	$1,260,218.20	0.42%
Mimecast Limited	MIME	Information Technology	29,998	$1,253,316.44	0.41%
MSA Safety Incorporated	MSA	Industrials	10,464	$1,244,588.16	0.41%
SolarWinds Corporation	SWI	Information Technology	67,578	$1,236,001.62	0.41%
Itron, Inc.	ITRI	Information Technology	18,968	$1,221,918.56	0.40%
Proofpoint, Inc.	PFPT	Information Technology	10,322	$1,200,138.94	0.40%
Stericycle, Inc.	SRCL	Industrials	21,798	$1,195,184.34	0.40%
AptarGroup, Inc.	ATR	Materials	10,639	$1,185,078.21	0.39%
Arrowhead Pharmaceuticals, Inc.	ARWR	Health Care	36,807	$1,186,657.68	0.39%
Haemonetics Corporation	HAE	Health Care	10,626	$1,165,459.68	0.39%
Rapid7, Inc.	RPD	Information Technology	24,439	$1,194,822.71	0.39%
American Homes 4 Rent (Class A)	AMH	Real Estate	45,645	$1,152,079.80	0.38%
Floor & Decor Holdings, Inc. (Class A)	FND	Consumer Discretionary	21,999	$1,143,948.00	0.38%
Verint Systems Inc.	VRNT	Information Technology	24,627	$1,141,953.99	0.38%
Americold Realty Trust	COLD	Real Estate	31,109	$1,110,902.39	0.37%
Hubbell Incorporated	HUBB	Industrials	9,229	$1,129,814.18	0.37%
j2 Global, Inc.	JCOM	Information Technology	14,148	$1,107,788.40	0.37%
Wayfair Inc. (Class A)	W	Consumer Discretionary	6,605	$1,133,087.75	0.37%
ABIOMED, Inc.	ABMD	Health Care	4,863	$1,088,825.70	0.36%
Elastic N.V.	ESTC	Information Technology	12,649	$1,086,802.08	0.36%
Life Storage, Inc.	LSI	Real Estate	11,200	$1,091,776.00	0.36%
Omnicell, Inc.	OMCL	Health Care	16,147	$1,080,395.77	0.36%
Syneos Health, Inc.	SYNH	Health Care	17,909	$1,092,269.91	0.36%
Viavi Solutions Inc.	VIAV	Information Technology	94,465	$1,094,849.35	0.36%
Agree Realty Corporation	ADC	Real Estate	17,107	$1,073,806.39	0.35%
Graco Inc.	GGG	Industrials	21,731	$1,047,651.51	0.35%
Tempur Sealy International, Inc.	TPX	Consumer Discretionary	16,151	$1,053,529.73	0.35%
Terreno Realty Corporation	TRNO	Real Estate	20,463	$1,047,500.97	0.35%
Lexington Realty Trust	LXP	Real Estate	106,641	$1,036,550.52	0.34%
Rexford Industrial Realty, Inc.	REXR	Real Estate	25,822	$1,027,715.60	0.34%
Armstrong World Industries, Inc.	AWI	Industrials	13,333	$1,005,174.87	0.33%
Bio-Techne Corporation	TECH	Health Care	3,723	$985,850.40	0.33%
Pure Storage, Inc. (Class A)	PSTG	Information Technology	57,395	$1,010,725.95	0.33%
Q2 Holdings, Inc.	QTWO	Information Technology	11,954	$987,639.48	0.33%
The Wendy's Company	WEN	Consumer Discretionary	47,444	$1,008,659.44	0.33%
Albemarle Corporation	ALB	Materials	12,523	$958,259.96	0.32%
Envestnet, Inc.	ENV	Information Technology	13,127	$953,151.47	0.32%
Frontdoor Inc	FTDR	Consumer Discretionary	20,298	$926,603.70	0.31%
LPL Financial Holdings Inc.	LPLA	Financials	12,970	$925,928.30	0.31%
Planet Fitness, Inc. (Class A)	PLNT	Consumer Discretionary	14,496	$936,876.48	0.31%
Globus Medical, Inc. (Class A)	GMED	Health Care	16,599	$907,135.35	0.30%
Eldorado Resorts, Inc.	ERI	Consumer Discretionary	24,513	$869,230.98	0.29%
HealthEquity, Inc.	HQY	Health Care	13,954	$864,729.38	0.29%
PTC Inc.	PTC	Information Technology	11,534	$880,966.92	0.29%
Erie Indemnity Company	ERIE	Financials	4,762	$858,302.88	0.28%
Glacier Bancorp, Inc.	GBCI	Financials	20,761	$855,145.59	0.28%
Ionis Pharmaceuticals, Inc.	IONS	Health Care	14,932	$839,327.72	0.28%
Jazz Pharmaceuticals Plc	JAZZ	Health Care	7,078	$844,546.96	0.28%
NuVasive, Inc.	NUVA	Health Care	13,935	$844,461.00	0.28%
ACI Worldwide, Inc.	ACIW	Information Technology	29,232	$806,218.56	0.27%
Cabot Oil & Gas Corporation	COG	Energy	41,068	$814,789.12	0.27%
Eagle Materials Inc.	EXP	Materials	12,085	$806,794.60	0.27%
First Financial Bankshares, Inc.	FFIN	Financials	26,303	$805,923.92	0.27%
First Industrial Realty Trust, Inc.	FR	Real Estate	21,245	$804,760.60	0.27%
Hyatt Hotels Corporation (Class A)	H	Consumer Discretionary	14,738	$811,916.42	0.27%
Integra LifeSciences Holdings Corporation	IART	Health Care	15,804	$823,546.44	0.27%
Aspen Technology, Inc.	AZPN	Information Technology	7,426	$784,482.64	0.26%
Corporate Office Properties Trust	OFC	Real Estate	31,901	$796,567.97	0.26%
Dolby Laboratories, Inc.	DLB	Information Technology	13,022	$790,826.06	0.26%
EastGroup Properties, Inc.	EGP	Real Estate	6,757	$785,501.25	0.26%
Eaton Vance Corp.	EV	Financials	21,890	$789,134.50	0.26%
HD Supply Holdings, Inc.	HDS	Industrials	24,831	$787,391.01	0.26%
Universal Display Corporation	OLED	Information Technology	5,357	$785,336.20	0.26%
Columbia Sportswear Company	COLM	Consumer Discretionary	10,119	$739,294.14	0.24%
Iridium Communications Inc.	IRDM	Communication Services	31,615	$727,145.00	0.24%
MGE Energy, Inc.	MGEE	Utilities	10,783	$732,057.87	0.24%
Interactive Brokers Group, Inc. (Class A)	IBKR	Financials	16,353	$692,549.55	0.23%
Reata Pharmaceuticals, Inc. (Class A)	RETA	Health Care	4,891	$710,760.12	0.23%
FibroGen, Inc.	FGEN	Health Care	20,315	$679,333.60	0.22%
Piedmont Office Realty Trust, Inc.	PDM	Real Estate	39,975	$666,783.00	0.22%
Manhattan Associates, Inc.	MANH	Information Technology	7,085	$626,314.00	0.21%
US Dollar	$USD	Other	650,365	$650,364.66	0.21%
Builders FirstSource, Inc.	BLDR	Industrials	28,862	$600,618.22	0.20%
Cimpress Plc	CMPR	Industrials	6,635	$598,012.55	0.20%
Proto Labs, Inc.	PRLB	Industrials	4,636	$585,758.60	0.19%
YETI Holdings, Inc.	YETI	Consumer Discretionary	18,083	$580,464.30	0.19%
Agios Pharmaceuticals, Inc.	AGIO	Health Care	9,948	$514,709.52	0.17%
Five Below, Inc.	FIVE	Consumer Discretionary	5,015	$524,819.75	0.17%
LendingTree, Inc.	TREE	Financials	1,925	$500,538.50	0.17%
New Relic, Inc.	NEWR	Information Technology	7,634	$504,989.10	0.17%
Wyndham Hotels & Resorts, Inc.	WH	Consumer Discretionary	11,203	$514,553.79	0.17%
Vail Resorts, Inc.	MTN	Consumer Discretionary	2,390	$474,008.70	0.16%
Valvoline Inc.	VVV	Materials	26,966	$494,826.10	0.16%
Choice Hotels International, Inc.	CHH	Consumer Discretionary	5,763	$465,823.29	0.15%
ITT Inc.	ITT	Industrials	7,782	$449,021.40	0.15%
RBC Bearings Incorporated	ROLL	Industrials	3,130	$440,234.50	0.15%
Western Alliance Bancorporation	WAL	Financials	11,532	$439,945.80	0.15%
Bank of Hawaii Corporation	BOH	Financials	6,390	$411,068.70	0.14%
Donaldson Company, Inc.	DCI	Industrials	9,137	$433,550.65	0.14%
Lennox International Inc.	LII	Industrials	1,942	$415,277.28	0.14%
National Instruments Corporation	NATI	Information Technology	10,671	$413,181.12	0.14%
OneMain Holdings, Inc.	OMF	Financials	18,462	$430,718.46	0.14%
Radian Group Inc.	RDN	Financials	27,258	$432,857.04	0.14%
SEI Investments Company	SEIC	Financials	7,617	$412,993.74	0.14%
Two Harbors Investment Corp.	TWO	Financials	92,646	$418,759.92	0.14%
Blueprint Medicines Corporation	BPMC	Health Care	6,036	$393,185.04	0.13%
Bright Horizons Family Solutions Inc.	BFAM	Consumer Discretionary	3,460	$387,104.80	0.13%
Clean Harbors, Inc.	CLH	Industrials	6,875	$408,306.25	0.13%
Curtiss-Wright Corporation	CW	Industrials	3,820	$383,146.00	0.13%
Healthcare Realty Trust Incorporated	HR	Real Estate	12,638	$387,986.60	0.13%
Ingersoll-Rand Inc.	IR	Industrials	14,233	$401,370.60	0.13%
Intercept Pharmaceuticals, Inc.	ICPT	Health Care	5,607	$405,161.82	0.13%
Iron Mountain Incorporated	IRM	Real Estate	14,832	$382,072.32	0.13%
John Bean Technologies Corporation	JBT	Industrials	4,752	$390,376.80	0.13%
PNM Resources, Inc.	PNM	Utilities	9,289	$379,176.98	0.13%
Silicon Laboratories Inc.	SLAB	Information Technology	4,133	$387,096.78	0.13%
South Jersey Industries, Inc.	SJI	Utilities	14,119	$400,414.84	0.13%
Woodward, Inc.	WWD	Industrials	5,938	$407,228.04	0.13%
CubeSmart	CUBE	Real Estate	13,176	$374,988.96	0.12%
Mattel, Inc.	MAT	Consumer Discretionary	40,066	$369,007.86	0.12%
PS Business Parks, Inc.	PSB	Real Estate	2,605	$348,132.20	0.12%
GrafTech International Ltd.	EAF	Industrials	43,471	$297,341.64	0.10%
Kilroy Realty Corp	KRC	Real Estate	5,541	$316,501.92	0.10%
The Brink's Company	BCO	Industrials	6,782	$271,958.20	0.09%

Holdings are subject to change.

The holdings information set forth above for the date indicated reflects creation and redemption transactions from the prior business day and may differ from the holdings information currently available from the Fund's custodian and accounting agent. With respect to the market value of the Fund's holdings set forth above, the pricing sources are generally third party vendors. The Fund ultimately relies on pricing information provided by the Fund's accounting agent.