Pioneer Municipal High Income Opportunities Fund, Inc.
Schedule of Investments  |  July 31, 2024 
 
Ticker Symbol: MIO
Schedule of Investments  |  7/31/24
(unaudited) 
Principal
Amount
USD ($) 		          Value
  UNAFFILIATED ISSUERS — 110.7%  
  Municipal Bonds — 110.7% of Net Assets(a)  
  Alabama — 0.5%  
1,100,000 Mobile County Industrial Development Authority, Calvert LLC Project, Series A, 5.00%, 6/1/54 $  1,131,108
  Total Alabama   $1,131,108
  Arizona — 3.2%  
1,675,000 Arizona Industrial Development Authority, Doral Academy Nevada Fire Mesa, Series A, 5.00%, 7/15/49 $  1,677,278
1,000,000 Arizona Industrial Development Authority, Doral Academy Of Northern Nevada Project, Series A, 4.00%, 7/15/51 (144A)      832,930
950,000 Arizona Industrial Development Authority, Doral Academy Of Northern Nevada Project, Series A, 4.00%, 7/15/56 (144A)      766,612
4,000,000 Maricopa County Industrial Development Authority, Commercial Metals Company, 4.00%, 10/15/47 (144A)   3,665,000
  Total Arizona   $6,941,820
  Arkansas — 5.2%  
9,500,000 Arkansas Development Finance Authority, Big River Steel Project, 4.50%, 9/1/49 (144A) $  9,531,540
1,750,000 Arkansas Development Finance Authority, Green Bond, 5.45%, 9/1/52   1,771,472
  Total Arkansas  $11,303,012
  California — 3.2%  
1,000,000 California County Tobacco Securitization Agency, Golden Gate Tobacco Settlement, Series A, 5.00%, 6/1/47 $    961,200
1,900,000(b) California Infrastructure & Economic Development Bank, Brightline West Passenger Rail Project, Series A-4, 8.00%, 1/1/50 (144A)   1,922,743
750,000 California Municipal Finance Authority, Westside Neighborhood School Project, 6.375%, 6/15/64 (144A)      814,935
300,000(c) California School Finance Authority, Envision Education – Obligated Group, Series A, 5.00%, 6/1/54 (144A)      305,445
1Pioneer Municipal High Income Opportunities Fund, Inc. | 7/31/24
Principal
Amount
USD ($) 		          Value
  California — (continued)  
2,315,000 California Statewide Communities Development Authority, Loma Linda University Medical Center, Series A, 5.25%, 12/1/56 (144A) $  2,335,812
740,000 Chino Community Facilities District, Series 3, 5.00%, 9/1/54     755,118
  Total California   $7,095,253
  Colorado — 9.5%  
5,180,000 Aerotropolis Regional Transportation Authority, 4.25%, 12/1/41 $  4,791,966
3,500,000 Aerotropolis Regional Transportation Authority, 4.375%, 12/1/52   3,113,320
2,620,000 Aerotropolis Regional Transportation Authority, 5.00%, 12/1/51   2,533,776
3,000,000 Colorado High Performance Transportation Enterprise, 5.00%, 12/31/56   3,001,680
1,897,000(d) Cottonwood Highlands Metropolitan District No. 1, Series A, 5.00%, 12/1/49   1,904,000
2,000,000 Dominion Water & Sanitation District, 5.875%, 12/1/52   2,011,740
3,475,000 Prairie Center Metropolitan District No 3, Series A, 5.00%, 12/15/41 (144A)   3,487,093
  Total Colorado  $20,843,575
  Delaware — 0.4%  
1,015,000 Delaware State Economic Development Authority, Aspira of Delaware Charter, 4.00%, 6/1/57 $    816,710
  Total Delaware     $816,710
  District of Columbia — 0.2%  
500,000 District of Columbia, Union Market Project, Series A, 5.125%, 6/1/34 (144A) $    502,755
  Total District of Columbia     $502,755
  Florida — 5.2%  
1,335,000 Capital Trust Authority, Series A, 5.50%, 12/15/33 (144A) $  1,361,926
1,320,000 Capital Trust Authority, Series A, 6.50%, 12/15/53 (144A)   1,375,638
2,000,000 Florida Development Finance Corp., Brightline Florida Passenger Rail Project, 5.50%, 7/1/53   2,079,300
1,000,000(b) Florida Development Finance Corp., Brightline Florida Passenger Rail Project, 12.00%, 7/15/32 (144A)   1,063,260
4,425,000 Florida Development Finance Corp., Glenridge On Palmer Ranch Project, 5.00%, 6/1/51 (144A)   4,169,279
Pioneer Municipal High Income Opportunities Fund, Inc. | 7/31/242
Schedule of Investments  |  7/31/24
(unaudited) (continued)
Principal
Amount
USD ($) 		          Value
  Florida — (continued)  
400,000 Florida Development Finance Corp., The Henry Project, Series A-1, 5.25%, 6/1/54 (144A) $    409,884
900,000 Florida Development Finance Corp., The Henry Project, Series B, 6.50%, 6/1/59 (144A)     924,228
  Total Florida  $11,383,515
  Illinois — 6.1%  
4,260,000(d) Chicago Board of Education, Series A, 5.00%, 12/1/42 $  4,261,235
9,500,000 Metropolitan Pier & Exposition Authority, McCormick Place Expansion, 4.00%, 6/15/50   8,991,845
  Total Illinois  $13,253,080
  Indiana — 1.7%  
1,250,000 City of Valparaiso, Pratt Paper LLC Project, 5.00%, 1/1/54 (144A) $  1,300,550
2,500,000 Indiana Finance Authority, Multipurpose Educational Facilities, Avondale Meadows Academy Project, 5.375%, 7/1/47   2,506,075
  Total Indiana   $3,806,625
  Iowa — 3.0%  
6,600,000 Iowa Finance Authority, Alcoa Inc. Projects, 4.75%, 8/1/42 $  6,594,588
  Total Iowa   $6,594,588
  Massachusetts — 0.9%  
2,000,000 Massachusetts Development Finance Agency, Lowell General Hospital, Series G, 5.00%, 7/1/44 $  2,000,060
  Total Massachusetts   $2,000,060
  Minnesota — 0.6%  
1,430,000 City of Rochester, Rochester Math & Science Academy, Series A, 5.125%, 9/1/38 $  1,301,286
  Total Minnesota   $1,301,286
  New Jersey — 0.8%  
1,745,000 Tobacco Settlement Financing Corp., Series B, 5.00%, 6/1/46 $  1,753,428
  Total New Jersey   $1,753,428
  New York — 27.7%  
5,300,000 Chautauqua Tobacco Asset Securitization Corp., 5.00%, 6/1/48 $  5,169,302
1,000,000 Dutchess County Local Development Corp., Health Quest Systems Inc., Series B, 5.00%, 7/1/46   1,000,810
3Pioneer Municipal High Income Opportunities Fund, Inc. | 7/31/24
Principal
Amount
USD ($) 		          Value
  New York — (continued)  
8,885,000 Erie Tobacco Asset Securitization Corp., Asset-Backed, Series A, 5.00%, 6/1/45 $  8,427,423
3,505,000 Nassau County Tobacco Settlement Corp., Asset-Backed, Series A-3, 5.00%, 6/1/35   3,274,126
2,895,000 Nassau County Tobacco Settlement Corp., Asset-Backed, Series A-3, 5.125%, 6/1/46   2,669,653
1,730,000 New York Counties Tobacco Trust IV, Series A, 5.00%, 6/1/42   1,638,327
7,915,000 New York Counties Tobacco Trust IV, Settlement pass through, Series A, 5.00%, 6/1/45   7,326,124
5,000,000 New York Transportation Development Corp., Series A, 5.25%, 1/1/50   5,002,050
3,000,000 New York Transportation Development Corp., Green Bond, 5.375%, 6/30/60   3,102,090
3,000,000 New York Transportation Development Corp., Green Bond, 5.50%, 6/30/60   3,191,070
900,000 Suffolk Regional Off-Track Betting Co., 6.00%, 12/1/53      944,550
6,715,000 TSASC, Inc., Series B, 5.00%, 6/1/48   6,014,693
5,775,000 Westchester County Local Development Corp., Purchase Senior Learning Community, 5.00%, 7/1/56 (144A)   5,676,998
8,000,000 Westchester County Local Development Corp., Purchase Senior Learning Community, Inc. Project, 4.50%, 7/1/56 (144A)   7,096,640
  Total New York  $60,533,856
  North Carolina — 0.6%  
1,200,000 North Carolina Medical Care Commission, Carolina Meadows, 5.25%, 12/1/49 $  1,280,796
  Total North Carolina   $1,280,796
  Ohio — 5.3%  
12,500,000 Buckeye Tobacco Settlement Financing Authority, Senior Class 2, Series B-2, 5.00%, 6/1/55 $ 11,575,875
  Total Ohio  $11,575,875
  Oklahoma — 2.7%  
5,900,000 Tulsa Airports Improvement Trust, Series C, 5.50%, 12/1/35 $  5,903,068
  Total Oklahoma   $5,903,068
  Pennsylvania — 3.0%  
600,000 Allentown Commercial and Industrial Development Authority, 5.75%, 6/15/43 $    622,962
Pioneer Municipal High Income Opportunities Fund, Inc. | 7/31/244
Schedule of Investments  |  7/31/24
(unaudited) (continued)
Principal
Amount
USD ($) 		          Value
  Pennsylvania — (continued)  
1,600,000 Allentown Commercial and Industrial Development Authority, 6.00%, 6/15/53 $  1,645,040
1,100,000 Allentown Neighborhood Improvement Zone Development Authority, Waterfront - 30 E. Allen Street Project, Series B, 6.00%, 5/1/42 (144A)   1,169,938
750,000 Philadelphia Authority for Industrial Development, 4.00%, 6/1/41      676,275
2,500,000(b) Philadelphia Authority for Industrial Development, 5.125%, 12/15/44 (144A)   2,374,225
  Total Pennsylvania   $6,488,440
  Puerto Rico — 15.3%  
2,574,442(b) Commonwealth of Puerto Rico, 11/1/43 $  1,576,846
5,000,000(b) Commonwealth of Puerto Rico, 11/1/51   1,482,500
7,673,960(d) Commonwealth of Puerto Rico, Restructured Series A-1, 4.00%, 7/1/37   7,461,852
1,796,000(d) Commonwealth of Puerto Rico, Restructured Series A-1, 4.00%, 7/1/41   1,682,852
3,624,000(d) Commonwealth of Puerto Rico, Restructured Series A-1, 4.00%, 7/1/46   3,312,336
1,900,000 GDB Debt Recovery Authority of Puerto Rico, 7.50%, 8/20/40   1,843,000
3,220,000 Puerto Rico Commonwealth Aqueduct & Sewer Authority, Series A, 5.00%, 7/1/37 (144A)   3,350,442
6,000,000 Puerto Rico Commonwealth Aqueduct & Sewer Authority, Series A, 5.00%, 7/1/47 (144A)   6,037,380
6,844,000 Puerto Rico Sales Tax Financing Corp. Sales Tax Revenue, Series A-1, 4.75%, 7/1/53   6,782,404
  Total Puerto Rico  $33,529,612
  Texas — 2.9%  
400,000 Arlington Higher Education Finance Corp., BASIS Texas Charter Schools, Inc., 4.875%, 6/15/59 (144A) $    396,432
300,000 Arlington Higher Education Finance Corp., Great Hearts America, Series A, 5.00%, 8/15/54      300,987
3,000,000 City of Houston Airport System Revenue, 4.00%, 7/15/41   2,850,060
2,200,000 Greater Texas Cultural Education Facilities Finance Corp., Texas Bipmedical Research Institute Project, Series A, 5.25%, 6/1/54   2,322,232
450,000 Port of Beaumont Navigation District, Jefferson Gulf Coast Energy Project, Series A, 5.125%, 1/1/44 (144A)     455,062
  Total Texas   $6,324,773
5Pioneer Municipal High Income Opportunities Fund, Inc. | 7/31/24
Principal
Amount
USD ($) 		          Value
  Virginia — 3.8%  
9,440,000 Tobacco Settlement Financing Corp., Series A-1, 6.706%, 6/1/46 $  8,220,163
  Total Virginia   $8,220,163
  West Virginia — 5.5%  
15,000,000 Tobacco Settlement Finance Authority, Series A, 4.306%, 6/1/49 $ 12,113,700
  Total West Virginia  $12,113,700
  Wisconsin — 3.4%  
1,115,000 Public Finance Authority, Coral Academy Science Reno, 5.00%, 6/1/39 (144A) $  1,092,299
8,000,000 Public Finance Authority, SearStone CCRC Project, 4.00%, 6/1/41 (144A)   6,399,600
  Total Wisconsin   $7,491,899
  Total Municipal Bonds
(Cost $228,375,814) 		$242,188,997
  TOTAL INVESTMENTS IN UNAFFILIATED ISSUERS — 110.7%
(Cost $228,375,814) 		$242,188,997
  OTHER ASSETS AND LIABILITIES — (10.7)% $(23,334,863)
  net assets — 100.0% $218,854,134
             
(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, 2024, the value of these securities amounted to $68,818,646, or 31.4% of net assets.
(a) Consists of Revenue Bonds unless otherwise indicated.
(b) The interest rate is subject to change periodically. The interest rate and/or reference index and spread shown at July 31, 2024.
(c) Securities purchased on a when-issued basis. Rates do not take effect until settlement date.
(d) Represents a General Obligation Bond.
Pioneer Municipal High Income Opportunities Fund, Inc. | 7/31/246
Schedule of Investments  |  7/31/24
(unaudited) (continued)
FUTURES CONTRACTS
FIXED INCOME INDEX FUTURES CONTRACTS
Number of
Contracts
Long 		Description Expiration
Date 		Notional
Amount 		Market
Value 		Unrealized
Appreciation
38 U.S. Ultra Bond (CBT) 9/19/24 $4,708,542 $4,862,813 $154,271
TOTAL FUTURES CONTRACTS $4,708,542 $4,862,813 $154,271
CBT Chicago Board of Trade.
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, 2024 in valuing the Fund’s investments:
  Level 1 Level 2 Level 3 Total
Municipal Bonds $— $242,188,997 $— $242,188,997
Total Investments in Securities $— $242,188,997 $— $242,188,997
Other Financial Instruments        
Net unrealized appreciation on futures contracts $154,271 $— $— $154,271
Total Other Financial Instruments $154,271 $— $— $154,271
During the period ended July 31, 2024, there were no transfers in or out of Level 3.
7Pioneer Municipal High Income Opportunities Fund, Inc. | 7/31/24
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