Preferred-Plus ETF
             
Schedule of Investments
 
 
 
 
 
 
 
June 30, 2022 (Unaudited)
             

   
Shares
   
Value
       
CLOSED-END FUNDS - 0.2%
             
Cohen & Steers Limited Duration Preferred and Income Fund, Inc. (b)
              1,293
  $
        25,588
       
TOTAL CLOSED-END FUNDS (Cost $30,140)
   
          25,588
       
                   
PREFERRED STOCKS — 104.1%
                 
Agriculture — 3.0%
                 
CHS, Inc.
                 
Series 1, 7.875%, 09/26/2023 (g)
 
4,791
   
        130,986
       
Series 2, 7.100% (3 Month LIBOR USD + 4.298%), 03/31/2024 (b)(f)(g)
 
4,258
   
        110,069
       
Series 4, 7.500%, 01/21/2025 (b)(g)
 
4,857
   
        127,933
       
         
        368,988
       
Auto Manufacturers — 2.8%
                 
Ford Motor Co.
                 
6.200%, 06/01/2059 (b)(h)
 
6,390
   
        158,344
       
6.000%, 12/01/2059 (b)(h)
 
7,456
   
        179,019
       
         
        337,363
       
Banks— 42.7% (e)
                 
Bank of America Corp.
                 
Series HH, 5.875%, 07/24/2023 (g)
 
6,390
   
        157,833
       
Series LL, 5.000%, 09/17/2024 (g)
 
6,390
   
        136,043
       
Citigroup Capital XIII
                 
7.609% (3 Month LIBOR USD + 6.370%), 10/30/2040 (b)(f)(h)
 
4,362
   
        116,902
       
Citigroup, Inc.
                 
Series J, 7.125%, (3 Month LIBOR USD + 4.040%), 09/30/2023 (f)(g)
 
6,390
   
        163,456
       
Series K, 6.875%, (3 Month LIBOR USD + 4.130%), 11/15/2023 (b)(f)(g)
 
10,643
   
        273,844
       
Citizens Financial Group, Inc.
                 
Series D, 6.350% (3 Month LIBOR USD + 3.642%), 04/06/2024 (f)(g)
 
6,390
   
        160,389
       
ConnectOne Bancorp, Inc.
                 
Series A, 5.250% (5 Year CMT USD + 4.420%), 09/01/2026 (b)(f)(g)
 
5,324
   
        120,216
       
Dime Community Bancshares, Inc.
                 
5.500%, 02/15/2025 (b)(g)
 
6,390
   
        131,315
       
Fifth Third Bancorp
                 
Series I, 6.625%, (3 Month LIBOR USD + 3.710%), 12/31/2023 (f)(g)
 
6,635
   
        167,268
       
Series K, 4.950%, 09/30/2024 (b)(g)
 
4,258
   
          95,890
       
First Citizens BancShares, Inc.
                 
Series A, 5.375%, 03/15/2025 (b)(g)
 
4,791
   
        104,444
       
First Republic Bank
                 
Series I, 5.500%, 06/30/2023 (g)
 
3,195
   
          73,805
       
JPMorgan Chase & Co.
                 
Series DD, 5.750%, 12/01/2023 (g)
 
9,585
   
        238,762
       
Series EE, 6.000%, 03/01/2024 (g)
 
4,791
   
        122,362
       
Series LL, 4.625%, 06/01/2026 (g)
 
4,791
   
          95,149
       
KeyCorp
                 
Series E, 6.125% (3 Month LIBOR USD + 3.892%), 12/15/2026 (b)(f)(g)
 
5,324
   
        134,005
       
Morgan Stanley
                 
Series E, 7.125% (3 Month LIBOR USD + 4.320%), 10/15/2023 (f)(g)
 
5,812
   
        152,449
       
Series F, 6.875% (3 Month LIBOR USD + 3.940%), 01/15/2024 (b)(f)(g)
 
6,571
   
        169,269
       
Series K, 5.850% (3 Month LIBOR USD + 3.491%), 04/15/2027 (b)(f)(g)
 
7,411
   
        183,274
       
Old National Bancorp
                 
Series C, 7.000%, 08/20/2025 (b)(g)
 
6,390
   
        164,031
       
PacWest Bancorp
                 
Series A, 7.750% (5 Year CMT USD + 4.820%), 09/01/2027 (f)(g)
 
6,000
   
        153,420
       
Regions Financial Corp.
                 
Series B, 6.375% (3 Month LIBOR USD + 3.536%), 09/15/2024 (b)(f)(g)
 
6,323
   
        160,035
       
Series C, 5.700% (3 Month LIBOR USD + 3.148%), 05/15/2029 (b)(f)(g)
 
6,390
   
        149,079
       
State Street Corp.
                 
Series D, 5.900% (3 Month LIBOR USD + 3.108%), 03/15/2024 (f)(g)
 
5,324
   
        132,408
       
Series G, 5.350% (3 Month LIBOR USD + 3.709%), 03/15/2026 (f)(g)
 
4,258
   
        106,024
       
Synovus Financial Corp.
                 
Series D, 6.300% (3 Month LIBOR USD + 3.352%), 06/21/2023 (b)(f)(g)
 
7,432
   
        174,132
       
Series E, 5.875% (5 Year CMT USD + 4.127%), 07/01/2024 (f)(g)
 
10,495
   
        260,591
       
The Goldman Sachs Group, Inc.
                 
Series J, 5.500% (3 Month LIBOR USD + 3.640%), 05/10/2023 (f)(g)
 
6,390
   
        156,172
       
Series K, 6.375% (3 Month LIBOR  USD + 3.550%), 05/10/2024 (f)(g)
 
1,225
   
          31,874
       
Truist Financial Corp.
                 
Series R, 4.750%, 09/01/2025 (b)(g)
 
4,258
   
          85,245
       
US Bancorp
                 
Series K, 5.500%, 10/15/2023 (g)
 
6,390
   
        155,916
       
Wells Fargo & Co.
                 
Series L, 7.500% (b)
 
68
   
          82,655
       
Series Q, 5.850% (3 Month LIBOR USD + 3.090%), 09/15/2023 (b)(f)(g)
 
6,415
   
        152,292
       
Series R, 6.625% (3 Month LIBOR USD + 3.690%), 03/15/2024 (f)(g)
 
4,791
   
        123,847
       
WesBanco, Inc.
                 
Series A, 6.750% (5 Year CMT USD + 6.557%), 11/15/2025 (f)(g)
 
5,324
   
        139,489
       
Wintrust Financial Corp.
                 
Series E, 6.875% (5 Year CMT USD + 6.507%), 07/15/2025 (f)(g)
 
6,390
   
        165,054
       
         
     5,188,939
       
Distribution & Wholesale — 1.6%
                 
WESCO International, Inc.
                 
Series A, 10.625% (5 Year CMT USD + 10.325%), 06/22/2025 (b)(f)(g)
 
7,298
   
        200,111
       
                   
Diversified Financial Services — 4.6%
                 
Air Lease Corp.
                 
Series A, 6.150% (3 Month LIBOR USD + 3.650%), 03/15/2024 (b)(f)(g)
 
6,390
   
        150,804
       
B. Riley Financial, Inc.
                 
5.000%, 12/31/2026 (h)
 
2,662
   
          60,161
       
Capital One Financial Corp.
                 
Series I, 5.000%, 12/01/2024 (b)(g)
 
5,393
   
        109,208
       
Series J, 4.800%, 06/01/2025 (b)(g)
 
3,240
   
          62,759
       
Stifel Financial Corp.
                 
Series D, 4.500%, 08/15/2026 (g)
 
3,195
   
          58,437
       
Synchrony Financial
                 
Series A, 5.625%, 11/15/2024 (b)(g)
 
6,390
   
        122,049
       
         
        563,418
       
Electric — 10.4%
                 
Algonquin Power & Utilities Corp. (a)
                 
6.875% (3 Month LIBOR USD + 3.677%), 10/17/2078 (f)(h)
 
3,195
   
          79,971
       
Series 19-A, 6.200% (3 Month LIBOR USD + 4.010%), 07/01/2079 (f)(h)
 
6,390
   
        155,788
       
CMS Energy Corp.
                 
5.875%, 03/01/2079 (h)
 
3,195
   
          76,105
       
Duke Energy Corp.
                 
5.625%, 09/15/2078 (b)(h)
 
6,254
   
        157,601
       
DTE Energy Co.
               
6.250%, 11/01/2022 (b)
 
              2,129
   
        109,473
       
National Rural Utilities Cooperative Finance Corp.
                 
Series US, 5.500%, 05/15/2064 (b)(h)
 
5,324
   
        127,882
       
SCE Trust III
                 
Series H, 5.750% (3 Month LIBOR USD + 2.990%), 03/15/2024 (f)(g)
 
5,324
   
        113,614
       
SCE Trust IV
                 
Series J, 5.375% (3 Month LIBOR USD + 3.132%), 09/15/2025 (b)(f)(g)
 
5,324
   
        107,012
       
SCE Trust V
                 
Series K, 5.450% (3 Month LIBOR USD + 3.790%), 03/15/2026 (b)(f)(g)
 
5,324
   
        115,903
       
Sempra Energy
                 
5.750%, 07/01/2079 (h)
 
6,390
   
        150,868
       
The Southern Co.
                 
Series 2020, 4.950%, 01/30/2080 (h)
 
3,195
   
          69,820
       
         
     1,264,037
       
Gas — 1.3%
                 
NiSource, Inc.
                 
Series B, 6.500% (5 Year CMT USD + 3.632%), 03/15/2024 (b)(f)(g)
 
5,931
   
        154,799
       
                   
Insurance — 18.4%
                 
American Equity Investment Life Holding Co.
                 
Series A, 5.950% (5 Year CMT USD + 4.322%), 12/01/2024 (b)(f)(g)
 
7,930
   
        180,725
       
Series B, 6.625% (5 Year CMT USD + 6.297%), 09/01/2025 (b)(f)(g)
 
7,456
   
        177,453
       
Aspen Insurance Holdings Ltd. (a)
                 
5.625%, 10/01/2024 (g)
 
3,195
   
          70,450
       
Athene Holding Ltd. (a)
                 
Series A, 6.350% (3 Month LIBOR USD + 4.253%), 06/30/2029 (b)(f)(g)
 
10,651
   
        261,908
       
Series C, 6.375% (5 Year CMT USD + 5.970%), 06/30/2025 (f)(g)
 
4,237
   
        107,620
       
Brighthouse Financial, Inc.
                 
Series B, 6.750%, 06/25/2025 (b)(g)
 
7,456
   
        180,808
       
6.250%, 09/15/2058 (b)(h)
 
3,619
   
          89,679
       
Enstar Group Ltd. (a)
                 
Series D, 7.000% (3 Month LIBOR USD + 4.015%), 09/01/2028 (b)(f)(g)
 
6,390
   
        148,887
       
Equitable Holdings, Inc.
                 
Series A, 5.250%, 12/15/2024 (b)(g)
 
5,415
   
        114,257
       
Kemper Corp.
                 
5.875% (5 Year CMT USD + 4.140%), 03/15/2062 (f)(h)
 
4,791
   
        118,338
       
MetLife, Inc.
                 
Series E, 5.625%, 06/15/2023 (g)
 
6,390
   
        162,817
       
Prudential Financial, Inc.
                 
5.625%, 08/15/2058 (h)
 
3,195
   
          80,099
       
Reinsurance Group of America, Inc.
                 
6.200% (3 Month LIBOR USD + 4.370%), 09/15/2042 (b)(f)(h)
 
6,254
   
        157,788
       
The Allstate Corp.
                 
5.100% (3 Month LIBOR USD + 3.165%), 01/15/2053 (f)(h)
 
6,390
   
        153,935
       
Unum Group
                 
6.250%, 06/15/2058 (h)
 
3,195
   
          76,808
       
Voya Financial, Inc.
                 
Series B, 5.350% (5 Year CMT USD + 3.210%), 09/15/2029 (f)(g)
 
6,843
   
        155,815
       
         
     2,237,387
       
Investment Companies - 0.6%
                 
Oaktree Capital Group, LLC
                 
Series B, 6.550%, 09/15/2023 (g)
 
3,195
   
          75,562
       
                   
Pipelines — 3.5%
                 
Enbridge, Inc. (a)
                 
Series B, 6.375% (3 Month LIBOR USD + 3.593%), 04/15/2078 (b)(f)(h)
 
6,323
   
        156,621
       
Energy Transfer LP
                 
Series E, 7.600% (3 Month LIBOR USD + 5.161%), 05/15/2024 (b)(f)(g)
 
7,456
   
        173,725
       
NuStar Logistics LP
                 
7.778% (3 Month LIBOR USD + 6.734%), 01/15/2043 (f)(h)
 
4,083
   
          97,788
       
         
        428,134
       
Real Estate Investment Trusts — 11.3%
                 
AGNC Investment Corp.
                 
Series F, 6.125% (3 Month LIBOR USD + 4.697%), 04/15/2025 (f)(g)
 
7,451
   
        150,510
       
Annaly Capital Management, Inc.
                 
Series F, 6.950% (3 Month LIBOR USD + 4.933%), 09/30/2022 (f)(g)
 
3,062
   
          68,466
       
Series I, 6.750% (3 Month LIBOR USD + 4.989%), 06/30/2024 (f)(g)
 
3,160
   
          68,667
       
Arbor Realty Trust, Inc.
                 
Series F, 6.250% (SOFR USD + 5.440%), 10/12/2026 (f)(g)
 
7,410
   
        151,164
       
Chimera Investment Corp.
                 
Series B, 8.000% (3 Month LIBOR USD + 5.791%), 03/30/2024 (f)(g)
 
3,682
   
          78,758
       
Hudson Pacific Properties, Inc.
                 
Series C, 4.750%, 11/16/2026 (g)
 
3,195
   
          60,865
       
KKR Real Estate Finance Trust, Inc.
                 
Series A, 6.500%, 04/16/2026 (b)(g)
 
5,430
   
        118,103
       
MFA Financial, Inc.
                 
Series C, 6.500% (3 Month LIBOR USD +5.345%), 03/31/2025 (f)(g)
 
2,617
   
          48,153
       
Pebblebrook Hotel Trust
                 
Series G, 6.375%, 05/13/2026 (b)(g)
 
6,390
   
        130,995
       
Public Storage
                 
Series M, 4.125%, 08/14/2025 (b)(g)
 
1,063
   
          20,686
       
Sachem Capital Corp.
                 
6.000%, 12/30/2026 (h)
 
3,195
   
          75,242
       
6.875%, 12/30/2024 (b)(h)
 
3,195
   
          78,948
       
Series A, 7.750%, 06/29/2026 (b)(g)
 
6,390
   
        150,676
       
Vornado Realty Trust
                 
Series N, 5.250%, 11/24/2025 (b)(g)
 
8,519
   
        166,632
       
         
     1,367,865
       
Retail — 0.3%
                 
Qurate Retail, Inc.
                 
8.000%, 03/15/2031 (h)
 
639
   
          37,350
       
                   
Savings & Loans — 1.5%
                 
New York Community Bancorp, Inc. (g)
                 
Series A, 6.375% (3 Month LIBOR USD + 3.821%), 03/17/2027 (f)(g)
 
7,410
   
        180,804
       
                   
Telecommunications — 2.1%
                 
AT&T, Inc.
                 
Series A, 5.000%, 12/12/2024 (b)(g)
 
1,196
   
          24,745
       
Series C, 4.750%, 02/18/2025 (b)(g)
 
1,286
   
          24,627
       
5.625%, 08/01/2067 (h)
 
3,195
   
          80,290
       
Telephone and Data Systems, Inc.
                 
Series UU, 6.625%, 03/31/2026 (b)(g)
 
6,390
   
        129,334
       
         
        258,996
       
TOTAL PREFERRED STOCKS (Cost $13,965,318)
       
   12,663,753
       
                   
MONEY MARKET FUNDS - 1.0%
             
First American Government Obligations Fund - Class X, 1.30% (d)
          119,075
   
        119,075
       
TOTAL MONEY MARKET FUNDS (Cost $119,075)
   
        119,075
       
                   
   
Number of
             
   
Contracts (c)
         
Notional Value
 
PURCHASED OPTIONS - 2.1%
             
PURCHASED PUT OPTIONS - 2.1%
               
CBOE S&P 500 Index
               
Expiration: August 2022, Exercise Price: $369
                   73
   
          80,337
  $
       2,763,342
 
Expiration: September 2022, Exercise Price: $355
                   63
   
          71,127
   
        2,384,802
 
Expiration: September 2022, Exercise Price: $370
                   69
   
        100,912
   
        2,611,926
 
TOTAL PURCHASED OPTIONS (Cost $272,176)
       
        252,376
       
                   
TOTAL INVESTMENTS (Cost $14,386,709) — 107.4%
       
   13,060,792
       
Other assets and liabilities, net — (7.4)%
       
       (900,409)
       
NET ASSETS — 100.0%
      $
 12,160,383
       

Percentages are stated as a percent of net assets.
     
               
CBOE  Chicago Board Options Exchange
     
CMT Constant Maturity Treasury Rate
             
LIBOR London Interbank Offered Rate
             
SOFR Secured Overnight Financing Rate
             

(a) Foreign issued security.
             
(b) A portion or all of the security has been segregated or earmarked as collateral for written options.
 
(c) Each contract has a multiplier of 100.
             
(d) The rate shown is the yield at period end.
 
(e) To the extent the Fund invests more heavily in particular sectors or asset classes, its performance will be especially sensitive to developments that significantly affect those sectors or asset classes.
 
(f) Variable rate securities. The coupon is based on a reference index and spread. The rate reported is the rate in effect as of June 30, 2022.
 
(g) Perpetual security. Perpetual securities have no stated maturity date, but they may be called/redeemed by the issuer as of the date indicated.
 
(h) Security may be called/redeemed by the issuer as of an earlier date.
 

Preferred-Plus ETF
                 
Schedule of Written Options
 
June 30, 2022 (Unaudited)
                 
                   
   
Number of
             
   
Contracts (a)
   
Value
   
Notional Value
 
WRITTEN OPTIONS - (10.2)%
                 
WRITTEN PUT OPTIONS - (10.2)%
                 
CBOE S&P 500 Index
                 
Expiration: August 2022, Exercise Price: $439
   
73
   
$
448,110
   
$
2,763,342
 
Expiration: September 2022, Exercise Price: $435
   
63
     
366,062
     
2,384,802
 
Expiration: September 2022, Exercise Price: $440
   
69
     
431,561
     
2,611,926
 
TOTAL WRITTEN OPTIONS (Premiums Received $1,265,221)
         
$
1,245,733
         
                         
Percentages are stated as a percent of net assets.
         
                         
CBOE Chicago Board Options Exchange
         
(a) Each contract has a multiplier of 100.
                       

Fair Value Measurements
             
Various inputs are used in determining the value of the Fund's investments. These inputs are summarized in three broad levels. Level 1 includes quoted prices in active markets for identical securities. Level 2 includes other significant observable inputs (including quoted prices for similar securities, interest rates, prepayment speeds and credit risk). Level 3 includes significant unobservable inputs (including the Fund's own assumptions in determining the fair value of investments). The level assigned to the securities valuations may not be an indication of the risk or liquidity associated with investing in those securities.
               
The Fund did not hold any investments during the period with significant unobservable inputs which would be classified as Level 3.
 
               
The following is a summary of the inputs used to value the Fund’s investments carried at fair value as of June 30, 2022:
     
               

   
Level 1
   
Level 2
   
Level 3
   
Total
 
Investments - Assets:
                       
Closed-End Funds
 
$
25,588
   
$
-
   
$
-
   
$
25,588
 
Money Market Funds
   
119,075
     
-
     
-
     
119,075
 
Preferred Stock*
   
12,663,753
     
-
     
-
     
12,663,753
 
Purchased Options
   
-
     
252,376
     
-
     
252,376
 
Total Investments - Assets
 
$
12,808,416
   
$
252,376
   
$
-
   
$
13,060,792
 
                                 
Other Financial Instruments - Liabilities:
                               
Written Put Options
 
$
-
   
$
1,245,733
   
$
-
   
$
1,245,733
 
                                 
* See the Schedule of Investments for industry classifications.