Nuveen Municipal High Income Opportunity Fund
US ˙ NYSE ˙ US6706821039

SecurityNMZ / Nuveen Municipal High Income Opportunity Fund
InstitutionBaird Financial Group, Inc.
Latest Disclosed Ownership157,561 shares
Latest Disclosed Value $ 1,635,483
Baird Financial Group, Inc. reports 0.05% increase in ownership of NMZ / Nuveen Municipal High Income Opportunity Fund

On May 14, 2026 - Baird Financial Group, Inc. filed a 13F-HR form disclosing ownership of 157,561 shares of Nuveen Municipal High Income Opportunity Fund (US:NMZ) valued at $1,635,483 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 13, 2026 disclosing 157,489 shares of Nuveen Municipal High Income Opportunity Fund. This represents a change in shares of 0.05% during the quarter. The current value of the position is $1,613,425 USD.

Institutional Ownership: 13F and NPORT Filings

The Security and Class in the table below are shown exactly as filed by the investor. We do our best to track continuity of investments through acquisitions, and this will be reflected in the table as changes in names. In addition to descriptive data, performance of the investment is shown over time. To calculate quarterly performance, we first calculate cost basis of the shares purchased during the quarter, then use that to calculate gross profit. Quarterly return is Gross Profit / Starting Portfolio value.

Note that cost basis is calculated and stored in thousands, so small quarterly changes in shares frequently result in a cost basis of zero.

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Disclosed Equity Positions (from 13F/NPORT Filings)
File
Date		 Effective
Date		Form Security Class ID Avg Price
Paid (Est)		 Reported
Shares		 ΔShares ΔShares
(%)		 Reported
Value
(x1000)		 ΔValue
(%)		 Alloc
(%)		 ΔAlloc ΔAlloc (%) Cost Basis
(x1000)		 Unrealized
Gain/Loss
(x1000)
2026-05-14 2026-03-31 13F NUVEEN MUN HIGH INCOME OPPOR COM 670682103 157,561 72 0.05 1,635 1.93 0.0014
2026-02-13 2025-12-31 13F NUVEEN MUN HIGH INCOME OPPOR COM COMMON 670682103 157,489 -43,552 -21.66 1,605 -24.66 0.0025
2025-11-13 2025-09-30 13F NUVEEN MUN HI INC OPP FD COMMON 670682103 201,041 6,242 3.20 2,129 5.40 0.0034
2025-08-13 2025-06-30 13F NUVEEN MUN HIGH INCOME OPPOR COM COMMON 670682103 194,799 -1,075 -0.55 2,020 -5.43 0.0035
2025-05-15 2025-03-31 13F NUVEEN MUN HIGH INCOME OPPOR COM COMMON 670682103 195,874 8,465 4.52 2,137 5.48 0.0041
2025-02-14 2024-12-31 13F NUVEEN MUN HI INC OPP FD COMMON 670682103 187,409 12,885 7.38 2,026 -0.44 0.0039
2024-11-14 2024-09-30 13F NUVEEN MUN HI INC OPP FD COMMON 670682103 174,524 16,854 10.69 2,035 19.58 0.0040
2024-08-14 2024-06-30 13F NUVEEN MUN HI INC OPP FD COMMON 670682103 157,670 2,494 1.61 1,701 3.85 0.0035
2024-05-14 2024-03-31 13F NUVEEN MUN HI INC OPP FD COMMON 670682103 155,176 10,508 7.26 1,639 14.63 0.0034
2024-02-14 2023-12-31 13F NUVEEN MUN HI INC OPP FD COMMON 670682103 144,668 34,349 31.14 1,429 39.69 0.0033
2023-11-13 2023-09-30 13F NUVEEN MUN HI INC OPP FD COMMON 670682103 110,319 3,692 3.46 1,024 -9.23 0.0028
2023-08-11 2023-06-30 13F NUVEEN MUN HI INC OPP FD COMMON 670682103 106,627 -7,631 -6.68 1,127 -8.60 0.0030
2023-05-15 2023-03-31 13F NUVEEN MUN HI INC OPP FD COMMON 670682103 114,258 11,000 10.65 1,234 123,200.00 0.0030
2023-02-13 2022-12-31 13F NUVEEN MUN HI INC OPP FD COMMON 670682103 103,258 23,196 28.97 1 -99.88 0.0028
2022-11-15 2022-09-30 13F NUVEEN MUN HI INC OPP FD COMMON 670682103 80,062 412 0.52 823 -11.70 0.0024
2022-08-08 2022-06-30 13F NUVEEN MUN HI INC OPP FD COMMON 670682103 79,650 -205 -0.26 932 -10.30 0.0026
2022-05-13 2022-03-31 13F NUVEEN MUN HI INC OPP FD COMMON 670682103 79,855 10,215 14.67 1,039 -1.33 0.0026
2022-02-09 2021-12-31 13F NUVEEN MUN HI INC OPP FD COMMON 670682103 69,640 20,863 42.77 1,053 46.25 0.0025
2021-11-12 2021-09-30 13F NUVEEN MUN HI INC OPP FD COMMON 670682103 48,777 8,871 22.23 720 17.26 0.0018
2021-08-11 2021-06-30 13F NUVEEN MUN HI INC OPP FD COMMON 670682103 39,906 26,380 195.03 614 214.87 0.0016
2021-05-13 2021-03-31 13F NUVEEN MUN HI INC OPP FD COMMON 670682103 13,526 2,871 26.95 195 26.62 0.0005
2021-02-11 2020-12-31 13F NUVEEN MUN HI INC OPP FD COMMON 670682103 10,655 -10,960 -50.71 154 -47.26 0.0005
2020-11-12 2020-09-30 13F NUVEEN MUN HI INC OPP FD COMMON 670682103 21,615 -244 -1.12 292 1.39 0.0010
2020-10-22 2020-06-30 13F/A-1 NUVEEN MUN HI INC OPP FD COMMON 670682103 21,859 3,863 21.47 288 28.57 0.0011
2020-08-14 2020-06-30 13F NUVEEN MUN HI INC OPP FD ETF - F 670682103 19,696 1,700 279 552.9146
2020-05-14 2020-03-31 13F NUVEEN MUN HI INC OPP FD COMMON 670682103 17,996 865 5.05 224 -7.82 0.0010
2020-02-14 2019-12-31 13F NUVEEN MUN HI INC OPP FD COMMON 670682103 17,131 6,356 58.99 243 57.79 0.0009
2019-11-14 2019-09-30 13F NUVEEN MUN HI INC OPP FD COMMON 670682103 10,775 10,775 154 0.0006
2017-02-10 2016-12-31 13F NUVEEN MUN HI INC OPP FD COMMON 670682103 0 -12,989 -100.00 0 -100.00
2016-11-10 2016-09-30 13F NUVEEN MUN HI INC OPP FD COMMON 670682103 12,989 12,989 188 0.0017
Legend
Shares
The total number of shares held by the institution at the end of the reporting period (the effective date). This is provided in the filing.
Value
The total value of the shares as of the effective date. This is provided in the filing.
Avg. Share Price
The weighted average share price of the shares held by the institution. We use FIFO accounting to determine this price
Class
This is the security class as indicated by the filer. There are a variety of values for this field. Common values include "EC" = equity common, "EP" - equity preferred
Allocation (%)
The percent of the institution's portfolio that this position represents. This is provided in NPORT filings. For 13F filings, we calculate it.
Change in Allocation
The change in allocation from the prior reporting period. This is calculated as current allocation - prior allocation.
Change in Allocation (%)
The percent change in allocation from the prior reporting period. This is calculated as (current allocation - prior allocation) / prior allocation.
Cost Basis
The total cost of the shares held. This is calculated as reported shares * avg. share price
Unrealized Gain/Loss
This is the market value of the position as of the effective date minus the cost basis.