Pioneer Municipal High Income Opportunities Fund, Inc.
Schedule of Investments  |  July 31, 2023
 
Ticker Symbol: MIO
Schedule of Investments  |  7/31/23
(unaudited) 
Principal
Amount
USD ($) 		          Value
  UNAFFILIATED ISSUERS — 110.9%  
  Municipal Bonds — 110.9% of Net Assets(a)  
  Arizona — 3.0%  
1,675,000 Arizona Industrial Development Authority, Doral Academy Nevada Fire Mesa, Series A, 5.00%, 7/15/49 $  1,520,766
1,000,000 Arizona Industrial Development Authority, Doral Academy Of Northern Nevada Project, Series A, 4.00%, 7/15/51 (144A)      746,640
950,000 Arizona Industrial Development Authority, Doral Academy Of Northern Nevada Project, Series A, 4.00%, 7/15/56 (144A)      685,102
4,000,000 Maricopa County Industrial Development Authority, Commercial Metals Company, 4.00%, 10/15/47 (144A)   3,462,360
  Total Arizona   $6,414,868
  Arkansas — 4.9%  
9,500,000 Arkansas Development Finance Authority, Big River Steel Project, 4.50%, 9/1/49 (144A) $  8,708,175
1,750,000 Arkansas Development Finance Authority, Green Bond, 5.45%, 9/1/52   1,729,298
  Total Arkansas  $10,437,473
  California — 8.2%  
1,000,000 California County Tobacco Securitization Agency, Golden Gate Tobacco Settlement, Series A, 5.00%, 6/1/47 $    927,100
1,000,000 California Statewide Communities Development Authority, Baptist University, Series A, 5.00%, 11/1/41 (144A)      994,070
1,500,000 California Statewide Communities Development Authority, Loma Linda University Medical Center, Series A, 5.00%, 12/1/46 (144A)   1,470,000
3,315,000 California Statewide Communities Development Authority, Loma Linda University Medical Center, Series A, 5.25%, 12/1/56 (144A)   3,319,973
750,000 City of Oroville, Oroville Hospital, 5.25%, 4/1/39      664,875
3,865,000 City of Oroville, Oroville Hospital, 5.25%, 4/1/49   3,197,630
8,550,000 City of Oroville, Oroville Hospital, 5.25%, 4/1/54   6,806,056
  Total California  $17,379,704
  Colorado — 8.9%  
5,180,000 Aerotropolis Regional Transportation Authority, 4.25%, 12/1/41 $  4,382,850
2,660,000 Aerotropolis Regional Transportation Authority, 5.00%, 12/1/51   2,344,923
1Pioneer Municipal High Income Opportunities Fund, Inc. |  | 7/31/23
Principal
Amount
USD ($) 		          Value
  Colorado — (continued)  
1,900,000(b) Cottonwood Highlands Metropolitan District No. 1, Series A, 5.00%, 12/1/49 $  1,773,422
7,000,000 Dominion Water & Sanitation District, 5.875%, 12/1/52   6,952,820
3,475,000 Prairie Center Metropolitan District No 3, Series A, 5.00%, 12/15/41 (144A)   3,417,801
  Total Colorado  $18,871,816
  Delaware — 0.3%  
1,015,000 Delaware State Economic Development Authority, Aspira of Delaware Charter, 4.00%, 6/1/57 $    748,228
  Total Delaware     $748,228
  Florida — 0.9%  
2,425,000 Florida Development Finance Corp., Glenridge On Palmer Ranch Project, 5.00%, 6/1/51 (144A) $  1,931,319
  Total Florida   $1,931,319
  Georgia — 2.5%  
8,440,000(c) Tender Option Bond Trust Receipts/Certificates, Series 2021, 7/15/50 (ST GTD) (144A) $  5,355,537
  Total Georgia   $5,355,537
  Illinois — 10.5%  
4,260,000(b) Chicago Board of Education, Series A, 5.00%, 12/1/42 $  4,173,948
2,000,000(b) Chicago Board of Education, Series D, 5.00%, 12/1/46   1,971,620
5,000,000(b) Chicago Board of Education, Series D, 5.00%, 12/1/46   4,929,050
2,255,000(b) City of Chicago, Series A, 5.50%, 1/1/33   2,294,327
9,500,000 Metropolitan Pier & Exposition Authority, McCormick Place Expansion, 4.00%, 6/15/50   8,847,350
  Total Illinois  $22,216,295
  Iowa — 3.9%  
8,600,000 Iowa Finance Authority, Alcoa Inc. Projects, 4.75%, 8/1/42 $  8,394,460
  Total Iowa   $8,394,460
  Kentucky — 0.5%  
1,010,000 City of Henderson, 4.70%, 1/1/52 (144A) $    963,227
  Total Kentucky     $963,227
Pioneer Municipal High Income Opportunities Fund, Inc. |  | 7/31/232
Schedule of Investments  |  7/31/23
(unaudited) (continued)
Principal
Amount
USD ($) 		          Value
  Massachusetts — 0.9%  
2,000,000 Massachusetts Development Finance Agency, Lowell General Hospital, Series G, 5.00%, 7/1/44 $  1,936,800
  Total Massachusetts   $1,936,800
  Minnesota — 0.6%  
1,430,000 City of Rochester, Rochester Math & Science Academy, Series A, 5.125%, 9/1/38 $  1,371,341
  Total Minnesota   $1,371,341
  New Jersey — 0.9%  
1,865,000 Tobacco Settlement Financing Corp., Series B, 5.00%, 6/1/46 $  1,859,405
  Total New Jersey   $1,859,405
  New York — 24.1%  
5,300,000 Chautauqua Tobacco Asset Securitization Corp., 5.00%, 6/1/48 $  4,964,033
1,000,000 Dutchess County Local Development Corp., Health Quest Systems Inc., Series B, 5.00%, 7/1/46   1,001,990
8,885,000 Erie Tobacco Asset Securitization Corp., Asset-Backed, Series A, 5.00%, 6/1/45   8,397,213
3,505,000 Nassau County Tobacco Settlement Corp., Asset-Backed, Series A-3, 5.00%, 6/1/35   3,252,430
2,895,000 Nassau County Tobacco Settlement Corp., Asset-Backed, Series A-3, 5.125%, 6/1/46   2,669,393
1,730,000 New York Counties Tobacco Trust IV, Series A, 5.00%, 6/1/42   1,636,182
7,915,000 New York Counties Tobacco Trust IV, Settlement pass through, Series A, 5.00%, 6/1/45   7,403,533
12,325,000 TSASC, Inc., Series B, 5.00%, 6/1/48  11,558,631
8,000,000 Westchester County Local Development Corp., Purchase Senior Learning Community, 4.50%, 7/1/56 (144A)   5,681,040
5,775,000 Westchester County Local Development Corp., Purchase Senior Learning Community, 5.00%, 7/1/56 (144A)   4,562,250
  Total New York  $51,126,695
  Ohio — 5.1%  
11,600,000 Buckeye Tobacco Settlement Financing Authority, Senior Class 2, Series B2, 5.00%, 6/1/55 $ 10,814,216
  Total Ohio  $10,814,216
3Pioneer Municipal High Income Opportunities Fund, Inc. |  | 7/31/23
Principal
Amount
USD ($) 		          Value
  Oklahoma — 2.8%  
5,900,000 Tulsa Airports Improvement Trust, Series C, 5.50%, 12/1/35 $  5,903,658
  Total Oklahoma   $5,903,658
  Pennsylvania — 0.3%  
750,000 Philadelphia Authority for Industrial Development, 4.00%, 6/1/41 $    619,980
  Total Pennsylvania     $619,980
  Puerto Rico — 19.9%  
7,673,960(b) Commonwealth of Puerto Rico, Restructured Series A1, 4.00%, 7/1/37 $  6,956,368
1,796,000(b) Commonwealth of Puerto Rico, Restructured Series A1, 4.00%, 7/1/41   1,544,560
3,624,000(b) Commonwealth of Puerto Rico, Restructured Series A1, 4.00%, 7/1/46   3,072,971
3,220,000 Puerto Rico Commonwealth Aqueduct & Sewer Authority, Series A, 5.00%, 7/1/37 (144A)   3,238,193
8,500,000 Puerto Rico Commonwealth Aqueduct & Sewer Authority, Series A, 5.00%, 7/1/47 (144A)   8,382,870
9,000,000 Puerto Rico Highway & Transportation Authority, Restructured Series A, 5.00%, 7/1/62   8,842,500
10,844,000 Puerto Rico Sales Tax Financing Corp. Sales Tax Revenue, Restructured Series A-1, 4.75%, 7/1/53  10,317,415
  Total Puerto Rico  $42,354,877
  Texas — 1.3%  
3,000,000 City of Houston Airport System Revenue, 4.00%, 7/15/41 $  2,685,330
  Total Texas   $2,685,330
  Virginia — 3.1%  
7,315,000 Tobacco Settlement Financing Corp., Series A-1, 6.706%, 6/1/46 $  6,536,026
  Total Virginia   $6,536,026
  West Virginia — 5.5%  
15,000,000 Tobacco Settlement Finance Authority, Series A, 4.306%, 6/1/49 $ 11,670,600
  Total West Virginia  $11,670,600
Pioneer Municipal High Income Opportunities Fund, Inc. |  | 7/31/234
Schedule of Investments  |  7/31/23
(unaudited) (continued)
Principal
Amount
USD ($) 		          Value
  Wisconsin — 2.8%  
8,000,000 Public Finance Authority, Searstone CCRC Project, 4.00%, 6/1/41 (144A) $  6,043,440
  Total Wisconsin   $6,043,440
  Total Municipal Bonds
(Cost $237,500,350) 		$235,635,295
  TOTAL INVESTMENTS IN UNAFFILIATED ISSUERS — 110.9%
(Cost $237,500,350) 		$235,635,295
  OTHER ASSETS AND LIABILITIES — (10.9)% $(23,173,496)
  net assets — 100.0% $212,461,799
             
ST GTD State Guaranteed.
(144A) The resale of such security is exempt from registration under Rule 144A of the Securities Act of 1933. Such securities may be resold normally to qualified institutional buyers. At July 31, 2023, the value of these securities amounted to $58,961,997, or 27.8% of net assets.
(a) Consists of Revenue Bonds unless otherwise indicated.
(b) Represents a General Obligation Bond.
(c) The interest rate is subject to change periodically. The interest rate and/or reference index and spread shown at July 31, 2023.
FUTURES CONTRACTS
FIXED INCOME INDEX FUTURES CONTRACTS
Number of
Contracts
Long 		Description Expiration
Date 		Notional
Amount 		Market
Value 		Unrealized
(Depreciation)
38 U.S. Ultra Bond (CBT) 9/20/23 $5,138,416 $5,024,313 $(114,103)
TOTAL FUTURES CONTRACTS $5,138,416 $5,024,313 $(114,103)
5Pioneer Municipal High Income Opportunities Fund, Inc. |  | 7/31/23
Various inputs are used in determining the value of the Fund's investments. These inputs are summarized in the three broad levels below.
Level 1 – unadjusted quoted prices in active markets for identical securities.
Level 2 – other significant observable inputs (including quoted prices for similar securities, interest rates, prepayment speeds, credit risks, etc.).
Level 3 – significant unobservable inputs (including the Adviser's own assumptions in determining fair value of investments).
The following is a summary of the inputs used as of July 31, 2023, in valuing the Fund's investments:
  Level 1 Level 2 Level 3 Total
Municipal Bonds $— $235,635,295 $— $235,635,295
Total Investments in Securities $— $235,635,295 $— $235,635,295
Other Financial Instruments        
Net unrealized depreciation on futures contracts $(114,103) $— $— $(114,103)
Total Other Financial Instruments $(114,103) $— $— $(114,103)
During the period ended July 31, 2023, there were no transfers in or out of Level 3.
Pioneer Municipal High Income Opportunities Fund, Inc. |  | 7/31/236
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