Frontier MFG Global Equity Fund
SCHEDULE OF INVESTMENTS
March 31, 2021 (Unaudited)
Number of Shares			Value
COMMON STOCKS 94.9%
		China  10.1%
	286,924	Alibaba Group Holding Ltd. - ADR (a)	$	65,054,279
	810,346	Tencent Holdings Ltd.		63,584,345
				128,638,624
		France  1.5%
	28,482	LVMH Moet Hennessy Louis Vuitton SE		18,975,085
		Germany  4.0%
	416,132	SAP SE		50,956,930
		Switzerland  7.1%
	371,303	Nestle SA		41,382,911
	565,055	Novartis AG		48,288,094
				89,671,005
		United Kingdom  4.2%
	598,322	Reckitt Benckiser Group PLC		53,598,803
		United States  68.0%
	5,687	Alphabet, Inc. - Class A (a)		11,729,551
	36,363	Alphabet, Inc. - Class C (a)		75,221,593
	280,089	Crown Castle International Corp.		48,211,720
	490,769	Eversource Energy		42,495,688
	250,453	Facebook, Inc. - Class A (a)		73,765,922
	459,140	Intercontinental Exchange, Inc.		51,276,755
	127,333	Mastercard, Inc. - Class A		45,336,915
	134,428	McDonald's Corp.		30,130,692
	393,315	Microsoft Corp.		92,731,877
	105,786	Netflix, Inc. (a)		55,184,325
	367,162	PepsiCo, Inc.		51,935,065
	647,427	Starbucks Corp.		70,744,348
	79,345	The Estee Lauder Companies, Inc. - Class A		23,077,493
	266,626	Visa, Inc. - Class A		56,452,723
	460,764	WEC Energy Group, Inc.		43,122,903
	678,746	Xcel Energy, Inc.		45,143,396
	451,722	Yum! Brands, Inc.		48,867,286
				865,428,252
		Total Common Stocks
		(Cost $757,466,147)		1,207,268,699
SHORT-TERM INVESTMENTS 5.0%
		Money Market Deposit Account 5.0%
	64,213,072	U.S. Bank N.A., 0.004% (b)		64,213,072
		Total Short-Term Investments
		(Cost $64,213,072)		64,213,072
		Total Investments 99.9%
		(Cost $821,679,219)		1,271,481,771
		Other Assets in Excess of Liabilities 0.1%		1,222,586
		TOTAL NET ASSETS 100.0%	$	1,272,704,357

(a) Non-Income Producing.

(b) The Money Market Deposit Account ("MMDA") is a short-term investment vehicle in which the Fund holds cash balances. The MMDA will bear interest at a variable rate that is determined based on market conditions and may change daily and by any amount. The rate shown is as of March 31, 2021.

ADR - American Depositary Receipt

Frontier MFG Global Plus Fund
SCHEDULE OF INVESTMENTS
March 31, 2021 (Unaudited)
Number of Shares			Value
COMMON STOCKS 94.0%
		China 10.0%
	139,610	Alibaba Group Holding Ltd. - ADR (a)	$	31,653,775
	394,719	Tencent Holdings Ltd.		30,971,893
				62,625,668
		France  1.5%
	13,767	LVMH Moet Hennessy Louis Vuitton SE		9,171,757
		Germany  4.0%
	201,547	SAP SE		24,680,189
		Switzerland  6.9%
	179,365	Nestle SA		19,990,805
	272,890	Novartis AG		23,320,452
				43,311,257
		United Kingdom  4.2%
	289,606	Reckitt Benckiser Group PLC		25,943,446
		United States  67.4%
	2,730	Alphabet, Inc. - Class A (a)		5,630,680
	17,749	Alphabet, Inc. - Class C (a)		36,716,114
	135,438	Crown Castle International Corp.		23,312,943
	239,250	Eversource Energy		20,716,658
	121,893	Facebook, Inc. - Class A (a)		35,901,145
	222,015	Intercontinental Exchange, Inc.		24,794,635
	61,644	Mastercard, Inc. - Class A		21,948,346
	65,048	McDonald's Corp.		14,579,859
	191,261	Microsoft Corp.		45,093,606
	51,622	Netflix, Inc. (a)		26,929,133
	179,501	PepsiCo, Inc.		25,390,417
	315,319	Starbucks Corp.		34,454,907
	38,859	The Estee Lauder Companies, Inc. - Class A		11,302,140
	129,009	Visa, Inc. - Class A		27,315,076
	224,812	WEC Energy Group, Inc.		21,040,155
	330,221	Xcel Energy, Inc.		21,962,998
	218,488	Yum! Brands, Inc.		23,636,032
				420,724,844
		Total Common Stocks
		(Cost $414,232,311)		586,457,161
SHORT-TERM INVESTMENTS 5.7%
		Money Market Deposit Account 5.7%
	35,285,448	U.S. Bank N.A., 0.004% (b)		35,285,448
		Total Short-Term Investments
		(Cost $35,285,448)		35,285,448
		Total Investments 99.7%
		(Cost $449,517,759)		621,742,609
		Other Assets in Excess of Liabilities 0.3%		1,630,264
		TOTAL NET ASSETS 100.0%	$	623,372,873

(a) Non-Income Producing.

(b) The Money Market Deposit Account ("MMDA") is a short-term investment vehicle in which the Fund holds cash balances. The MMDA will bear interest at a variable rate that is determined based on market conditions and may change daily and by any amount. The rate shown is as of March 31, 2021.

ADR - American Depositary Receipt

Frontier MFG Global Sustainable Fund
SCHEDULE OF INVESTMENTS
March 31, 2021 (Unaudited)
Number of Shares			Value
COMMON STOCKS 89.8%
		China 7.7%
	4,586	Alibaba Group Holding Ltd. - ADR (a)	$	1,039,784
	10,946	Tencent Holdings Ltd.		858,885
				1,898,669
		France  2.0%
	7,249	Danone SA		497,305
		Germany  3.0%
	6,038	SAP SE		739,376
		Italy  2.2%
	70,162	Terna Rete Elettrica Nazionale SpA		529,714
		Spain  3.1%
	42,452	Red Electrica Corp SA		751,733
		Switzerland  6.8%
	6,938	Nestle SA		773,261
	10,400	Novartis AG		888,756
				1,662,017
		United Kingdom  7.5%
	10,954	Reckitt Benckiser Group PLC		981,280
	15,347	Unilever PLC		856,321
				1,837,601
		United States  57.5%
	885	Alphabet, Inc. - Class C (a)		1,830,737
	227	Amazon.com, Inc. (a)		702,356
	5,074	American Water Works Co., Inc.		760,694
	591	Chipotle Mexican Grill, Inc. (a)		839,705
	1,602	CME Group, Inc.		327,176
	6,929	Eversource Energy		599,982
	5,098	Facebook, Inc. - Class A (a)		1,501,514
	5,377	Intercontinental Exchange, Inc.		600,504
	1,799	Mastercard, Inc. - Class A		640,534
	7,469	Microsoft Corp.		1,760,966
	924	Netflix, Inc. (a)		482,014
	4,987	PepsiCo, Inc.		705,411
	8,088	Starbucks Corp.		883,776
	3,353	Visa, Inc. - Class A		709,931
	3,337	Walmart, Inc.		453,265
	19,556	Wells Fargo & Co.		764,053
	5,439	Yum! Brands, Inc.		588,391
				14,151,009
		Total Common Stocks
		(Cost $19,380,384)		22,067,424
SHORT-TERM INVESTMENTS 10.0%
		Money Market Deposit Account 10.0%
	2,464,538	U.S. Bank N.A., 0.004% (b)		2,464,538
		Total Short-Term Investments
		(Cost $2,464,538)		2,464,538
		Total Investments 99.8%
		(Cost $21,844,922)		24,531,962
		Other Assets in Excess of Liabilities 0.2%		57,677
		TOTAL NET ASSETS 100.0%	$	24,589,639

(a) Non-Income Producing.

(b) The Money Market Deposit Account ("MMDA") is a short-term investment vehicle in which the Fund holds cash balances. The MMDA will bear interest at a variable rate that is determined based on market conditions and may change daily and by any amount. The rate shown is as of  March 31, 2021.

ADR - American Depositary Receipt

Frontier MFG Core Infrastructure Fund
SCHEDULE OF INVESTMENTS
March 31, 2021 (Unaudited)
Number of Shares			Value
COMMON STOCKS 98.0%
		Australia  7.7%
	1,202,615	APA Group	$	9,152,724
	1,018,712	Atlas Arteria Ltd.		4,603,885
	3,719,890	AusNet Services		5,184,683
	1,830,305	Spark Infrastructure Group		3,016,750
	2,827,102	Sydney Airport		13,291,934
	2,154,664	Transurban Group		21,799,163
				57,049,139
		Canada  14.1%
	625,367	Algonquin Power & Utilities Corp.		9,907,740
	195,998	Canadian Utilities Ltd. - Class A		5,262,173
	259,381	Emera, Inc.		11,543,868
	604,682	Enbridge, Inc.		22,027,804
	474,794	Fortis, Inc.		20,601,987
	625,924	Hydro One Ltd.		14,578,496
	471,680	TC Energy Corp.		21,622,889
				105,544,957
		Chile  0.3%
	6,320,474	Aguas Andinas SA - Class A		1,955,444
		France  5.7%
	103,646	Aeroports de Paris		12,385,547
	587,485	Getlink SE (a)		9,011,415
	206,484	Vinci SA		21,153,756
				42,550,718
		Germany  0.8%
	99,451	Fraport AG Frankfurt Airport Services Worldwide (a)		6,047,089
		Hong Kong  1.7%
	2,199,573	Power Assets Holdings Ltd		12,986,764
		Italy  7.0%
	223,903	ACEA SpA		4,894,341
	152,518	ASTM SpA (a)		4,614,549
	593,801	Enav SpA		2,888,472
	802,014	Italgas SpA		5,205,807
	3,455,996	Snam SpA		19,161,926
	2,073,329	Terna Rete Elettrica Nazionale SpA		15,653,363
				52,418,458
		Mexico  1.8%
	328,192	Grupo Aeroportuario del Centro Norte SAB de CV (a)		2,070,358
	511,342	Grupo Aeroportuario del Pacifico SAB de CV - Class B		5,337,700
	285,179	Grupo Aeroportuario del Sureste SAB de CV - Class B (a)		5,064,702
	322,178	Infraestructura Energetica Nova SAB de CV		1,245,239
				13,717,999
		Netherlands  0.9%
	126,710	Koninklijke Vopak NV		6,307,787
		New Zealand  1.5%
	1,459,588	Auckland International Airport Ltd.		7,991,933
	1,046,972	Vector Ltd.		2,961,390
				10,953,323
		Portugal  0.2%
	623,151	REN - Redes Energeticas Nacionais SGPS SA		1,739,237
		Spain  8.1%
	126,085	Aena SME SA (a)		20,449,094
	419,672	Cellnex Telecom SA		24,164,619
	259,682	Enagas SA		5,639,898
	579,173	Red Electrica Corp SA		10,255,898
				60,509,509
		Switzerland  0.7%
	32,627	Flughafen Zuerich AG (a)		5,361,025
		United Kingdom  6.2%
	1,908,633	National Grid PLC		22,734,038
	418,216	Pennon Group PLC		5,621,415
	259,571	Severn Trent PLC		8,251,937
	733,181	United Utilities Group PLC		9,357,693
				45,965,083
		United States  41.3%
	22,692	ALLETE, Inc.		1,524,676
	109,603	Alliant Energy Corp.		5,936,099
	114,703	Ameren Corp.		9,332,236
	190,987	American Electric Power Co., Inc.		16,176,599
	12,310	American States Water Co.		930,882
	69,422	American Tower Corp.		16,596,023
	83,394	American Water Works Co., Inc.		12,502,429
	61,189	Atmos Energy Corp.		6,048,533
	143,530	Avangrid, Inc.		7,149,229
	24,153	Avista Corp.		1,153,306
	26,882	Black Hills Corp.		1,794,911
	15,472	California Water Service Group		871,693
	125,238	CMS Energy Corp.		7,667,070
	156,036	Consolidated Edison, Inc.		11,671,493
	99,919	Crown Castle International Corp.		17,199,058
	210,464	Dominion Energy Corp.		15,986,845
	89,001	DTE Energy Co.		11,849,593
	169,338	Duke Energy Corp.		16,346,197
	91,227	Entergy Corp.		9,074,350
	106,793	Essential Utilities, Inc.		4,778,987
	98,865	Evergy, Inc.		5,885,433
	151,726	Eversource Energy		13,137,954
	247,534	FirstEnergy Corp.		8,586,955
	20,846	IDACORP, Inc.		2,083,975
	17,062	MGE Energy, Inc.		1,218,056
	178,557	NiSource, Inc.		4,305,009
	8,491	Northwest Natural Holding Co.		458,089
	23,320	NorthWestern Corp.		1,520,464
	23,234	ONE Gas, Inc.		1,786,927
	49,141	Pinnacle West Capital Corp.		3,997,620
	34,126	PNM Resources, Inc.		1,673,880
	41,267	Portland General Electric Co.		1,958,945
	350,412	PPL Corp.		10,105,882
	48,359	SBA Communications Corp.		13,422,040
	120,214	Sempra Energy		15,937,972
	8,232	SJW Group		518,534
	28,661	South Jersey Industries, Inc.		647,165
	23,815	Spire, Inc.		1,759,690
	258,649	The Southern Co.		16,077,622
	139,415	WEC Energy Group, Inc.		13,047,850
	237,629	Xcel Energy, Inc.		15,804,705
				308,524,976
		Total Common Stocks
		(Cost $603,919,124)		731,631,508
CLOSED-END FUNDS 1.1%
		United Kingdom  1.1%
	2,019,139	HICL Infrastructure PLC (a)		4,592,938
	1,696,810	International Public Partnerships Ltd. (a)		3,934,591
				8,527,529
		Total Closed-End Funds
		(Cost $7,214,413)		8,527,529
RIGHTS 0.0%
		Italy 0.0%
	3,591,691	Snam SpA		-
		Total Rights
		(Cost $0)		-
SHORT-TERM INVESTMENTS 1.1%
		Money Market Deposit Account 1.1%
	8,005,340	U.S. Bank N.A., 0.004% (b)		8,005,340
		Total Short-Term Investments
		(Cost $8,005,340)		8,005,340
		Total Investments 100.2%
		(Cost $619,138,877)		748,164,377
		Liabilities in Excess of Other Assets (0.2)%		(1,392,648	)
		TOTAL NET ASSETS 100.0%	$	746,771,729

(a) Non-Income Producing.

(b) The Money Market Deposit Account ("MMDA") is a short-term investment vehicle in which the Fund holds cash balances. The MMDA will bear interest at a variable rate that is determined based on market conditions and may change daily and by any amount. The rate shown is as of March 31, 2021.

Frontier MFG Select Infrastructure Fund
SCHEDULE OF INVESTMENTS
March 31, 2021 (Unaudited)
Number of Shares			Value
COMMON STOCKS 94.5%
		Australia  15.9%
	249,200	APA Group	$	1,896,583
	845,958	Atlas Arteria Ltd.		3,823,154
	548,047	AusNet Services		763,853
	1,840,556	Spark Infrastructure Group		3,033,645
	256,106	Sydney Airport		1,204,111
	760,042	Transurban Group		7,689,496
				18,410,842
		Canada  5.0%
	159,371	Enbridge, Inc.		5,805,685
		France  4.8%
	2,350	Aeroports de Paris		280,822
	51,462	Vinci SA		5,272,150
				5,552,972
		Italy  5.0%
	19,025	ASTM SpA (a)		575,616
	531,910	Snam SpA		2,949,199
	302,739	Terna Rete Elettrica Nazionale SpA		2,285,640
				5,810,455
		Netherlands  1.4%
	32,321	Koninklijke Vopak NV		1,608,981
		New Zealand  1.1%
	243,174	Auckland International Airport Ltd.		1,331,492
		Spain  7.8%
	27,984	Aena SME SA (a)		4,538,584
	255,091	Red Electrica Corp SA		4,517,109
				9,055,693
		United Kingdom  6.0%
	284,543	National Grid PLC		3,389,238
	284,820	United Utilities Group PLC		3,635,198
				7,024,436
		United States  47.5%
	36,636	Alliant Energy Corp.		1,984,206
	21,360	American Tower Corp.		5,106,322
	23,139	American Water Works Co., Inc.		3,468,999
	61,704	Atmos Energy Corp.		6,099,441
	30,162	Crown Castle International Corp.		5,191,785
	39,718	CSX Corp.		3,829,610
	69,741	Evergy, Inc.		4,151,682
	59,357	Eversource Energy		5,139,722
	16,849	Norfolk Southern Corp.		4,524,293
	40,806	Sempra Energy		5,410,059
	5,190	Union Pacific Corp.		1,143,928
	48,242	WEC Energy Group, Inc.		4,514,969
	69,312	Xcel Energy, Inc.		4,609,940
				55,174,956
		Total Common Stocks
		(Cost $97,886,194)		109,775,512
RIGHTS 0.0%
		Italy 0.0%
	522,224	Snam SpA		-
		Total Rights
		(Cost $0)		-
SHORT-TERM INVESTMENTS 4.8%
		Money Market Deposit Account 4.8%
	5,535,105	U.S. Bank N.A., 0.004% (b)		5,535,105
		Total Short-Term Investments
		(Cost $5,535,105)		5,535,105
		Total Investments 99.3%
		(Cost $103,421,299)		115,310,617
		Other Assets in Excess of Liabilities 0.7%		786,969
		TOTAL NET ASSETS 100.0%	$	116,097,586

(a) Non-Income Producing.

(b) The Money Market Deposit Account ("MMDA") is a short-term investment vehicle in which the Fund holds cash balances. The MMDA will bear interest at a variable rate that is determined based on market conditions and may change daily and by any amount. The rate shown is as of March 31, 2021.

Investment Valuation – Securities are valued at their fair value. Equity securities, including preferred stocks, that are traded on a national securities exchange, except for those traded on NASDAQ Global Market, NASDAQ Global Select Market and NASDAQ Capital Market exchanges (together, "NASDAQ"), for which market quotations are readily available are valued at the last reported sale price on the national securities exchange on which such securities are principally traded. Equity securities that are traded on NASDAQ are valued using the NASDAQ Official Closing Price ("NOCP"). Equity securities for which there were no transactions on a given day or securities not listed on a national securities exchange are valued at the most recent quoted bid price. Debt securities are valued at the bid price provided by an independent pricing service, which uses valuation methods such as matrix pricing and other analytical pricing models, as well as market transactions and other market inputs. Shares of underlying mutual funds are valued at their respective Net Asset Value ("NAV"). Deposit accounts are valued at acquisition cost which approximates fair value. Exchange-traded funds and closed-end funds are valued at the last reported sale price on the exchange on which the security is principally traded. Securities that are primarily traded on foreign exchanges generally are valued at the last sale price of such securities on their respective exchange. In the case of foreign securities, the occurrence of events after the close of the foreign markets, but prior to the time a Fund's NAV is calculated, will result in a systematic fair value adjustment to the trading prices of foreign securities provided that there is a movement in the markets that exceeds a threshold established by the Board of Directors (the "Board") and provided the fair value prices exceed a pre-established confidence level. The Funds will also value foreign securities at fair value using fair valuation procedures approved by the Board in the case of other significant events relating to a particular foreign issuer or market. In such cases, use of fair valuation can reduce an investor's ability to seek to profit by estimating the Fund's NAV in advance of the time the NAV is calculated. The Board has retained an independent fair value pricing service to assist in valuing foreign securities held by the Funds. In valuing assets, prices denominated in foreign currencies are converted to U.S. dollar equivalents at the current exchange rate, which approximates fair value. Any securities or other assets for which market quotations are not readily available are valued at their fair value as determined in good faith by the Adviser or subadvisers pursuant to guidelines established by the Board. The Board has appointed a Valuation Committee to assist the Board in its oversight of the Funds' valuation procedures.

The Funds follow a fair value hierarchy that distinguishes between market data obtained from independent sources (observable inputs) and the Funds' own market assumptions (unobservable inputs). These inputs are used in determining the value of each Fund's investments and are summarized in the following fair value hierarchy:

Level 1 — Quoted prices in active markets for identical securities that the Funds have the ability to access

Level 2 — Evaluated prices based on other significant observable inputs (including quoted prices for similar securities, foreign security indices, foreign exchange rates, fair value estimates for foreign securities and changes in benchmark securities indices)

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

The following is a summary of inputs used to value the Funds’ securities as of March 31, 2021:

 

Global Equity Fund
Description	Level 1		Level 2		Level 3		Total
Equity (a)
Common Stocks	$	1,207,268,699	$	-	$	-	$	1,207,268,699
Total Equity		1,207,268,699		-		-		1,207,268,699
Short-Term Investments		64,213,072		-		-		64,213,072
Total Investments in Securities	$	1,271,481,771	$	-	$	-	$	1,271,481,771
Global Plus Fund
Description	Level 1		Level 2		Level 3		Total
Equity (a)
Common Stocks	$	586,457,161	$	-	$	-	$	586,457,161
Total Equity		586,457,161		-		-		586,457,161
Short-Term Investments		35,285,448		-		-		35,285,448
Total Investments in Securities	$	621,742,609	$	-	$	-	$	621,742,609
Global Sustainable Fund
Description	Level 1		Level 2		Level 3		Total
Equity (a)
Common Stocks	$	22,067,424	$	-	$	-	$	22,067,424
Total Equity		22,067,424		-		-		22,067,424
Short-Term Investments		2,464,538		-		-		2,464,538
Total Investments in Securities	$	24,531,962	$	-	$	-	$	24,531,962
Core Fund
Description	Level 1		Level 2		Level 3		Total
Equity (a)
Common Stocks	$	731,631,508	$	-	$	-	$	731,631,508
Closed-End Funds		8,527,529		-		-		8,527,529
Total Equity		740,159,037		-		-		740,159,037
Rights		-		-		-		-
Short-Term Investments		8,005,340		-		-		8,005,340
Total Investments in Securities	$	748,164,377	$	-	$	-	$	748,164,377
Select Fund
Description	Level 1		Level 2		Level 3		Total
Equity (a)
Common Stocks	$	109,775,512	$	-	$	-	$	109,775,512
Total Equity		109,775,512		-		-		109,775,512
Rights		-		-		-		-
Short-Term Investments		5,535,105		-		-		5,535,105
Total Investments in Securities	$	115,310,617	$	-	$	-	$	115,310,617
(a) See each Fund's Schedule of Investments for sector or country classifications.

Tax Disclosure - Each Fund intends to comply with the requirements of Subchapter M of the Internal Revenue Code of 1986, as amended, necessary to qualify as a regulated investment company and to make the requisite distributions of income and capital gains to its shareholders sufficient to relieve it from all or substantially all federal income taxes. Therefore, no federal income tax provision has been provided.

The Funds have adopted financial reporting rules regarding recognition and measurement of tax positions taken or expected to be taken on a tax return. The Funds recognize interest and penalties, if any, as income tax expense on the Statements of Operations. During the period, the Funds did not incur any interest or penalties. The Funds have reviewed all open tax years and concluded that there is no effect to any of the Fund's financial positions or results of operations and no tax liability resulting from unrecognized tax benefits relating to uncertain income tax positions taken or expected to be taken on a tax return. The Funds have no examinations in progress.