Nuveen Municipal High Income Opportunity Fund
US ˙ NYSE ˙ US6706821039

SecurityNMZ / Nuveen Municipal High Income Opportunity Fund
InstitutionStifel Financial Corp
Latest Disclosed Ownership260,916 shares
Latest Disclosed Value $ 2,708,307
Stifel Financial Corp reports 0.01% decrease in ownership of NMZ / Nuveen Municipal High Income Opportunity Fund

On May 12, 2026 - Stifel Financial Corp filed a 13F-HR form disclosing ownership of 260,916 shares of Nuveen Municipal High Income Opportunity Fund (US:NMZ) valued at $2,708,308 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 13, 2026 disclosing 260,942 shares of Nuveen Municipal High Income Opportunity Fund. This represents a change in shares of -0.01% during the quarter. The current value of the position is $2,671,780 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)
2026-05-12 2026-03-31 13F NUVEEN MUN HIGH INCOME OPPOR COM 670682103 260,916 -26 -0.01 2,708 1.88 0.0025
2026-02-13 2025-12-31 13F NUVEEN MUN HIGH INCOME OPPOR COM 670682103 260,942 374 0.14 2,659 -3.66 0.0024
2025-11-12 2025-09-30 13F NUVEEN MUN HIGH INCOME OPPOR COM 670682103 260,568 -1,989 -0.76 2,759 1.36 0.0025
2025-08-14 2025-06-30 13F NUVEEN MUN HIGH INCOME OPPOR COM 670682103 262,557 210,184 401.32 2,723 376.71 0.0026
2025-05-14 2025-03-31 13F NUVEEN MUN HIGH INCOME OPPOR COM 670682103 52,373 1,000 1.95 571 2.88 0.0006
2025-02-13 2024-12-31 13F NUVEEN MUN HIGH INCOME OPPOR COM 670682103 51,373 0 0.00 555 -7.35 0.0006
2024-11-14 2024-09-30 13F NUVEEN MUN HIGH INCOME OPPOR COM 670682103 51,373 -153,560 -74.93 599 -72.91 0.0006
2024-08-13 2024-06-30 13F NUVEEN MUN HIGH INCOME OPPOR COM 670682103 204,933 12,658 6.58 2,211 8.92 0.0025
2024-05-14 2024-03-31 13F NUVEEN MUN HIGH INCOME OPPOR COM 670682103 192,275 6,478 3.49 2,030 10.63 0.0023
2024-02-12 2023-12-31 13F NUVEEN MUN HIGH INCOME OPPOR COM 670682103 185,797 -57,472 -23.62 1,836 -18.70 0.0023
2023-11-13 2023-09-30 13F NUVEEN MUN HIGH INCOME OPPOR COM 670682103 243,269 6,961 2.95 2,258 -9.61 0.0032
2023-08-14 2023-06-30 13F NUVEEN MUN HIGH INCOME OPPOR COM 670682103 236,308 8,561 3.76 2,498 1.55 0.0034
2023-05-12 2023-03-31 13F NUVEEN MUN HIGH INCOME OPPOR COM 670682103 227,747 26 0.01 2,460 4.46 0.0035
2023-02-13 2022-12-31 13F NUVEEN MUN HIGH INCOME OPPOR COM 670682103 227,721 33,628 17.33 2,355 17.99 0.0035
2022-11-14 2022-09-30 13F NUVEEN MUN HIGH INCOME OPPOR COM 670682103 194,093 -2,989 -1.52 1,995 -13.49 0.0033
2022-08-15 2022-06-30 13F NUVEEN MUN HIGH INCOME OPPOR COM 670682103 197,082 172,097 688.80 2,306 609.54 0.0036
2022-05-13 2022-03-31 13F NUVEEN MUN HIGH INCOME OPPOR COM 670682103 24,985 300 1.22 325 -12.87 0.0004
2022-02-14 2021-12-31 13F NUVEEN MUN HIGH INCOME OPPOR COM 670682103 24,685 -1,000 -3.89 373 -1.58 0.0005
2021-11-15 2021-09-30 13F NUVEEN MUN HIGH INCOME OPPOR COM 670682103 25,685 -1,000 -3.75 379 -7.79 0.0006
2021-08-13 2021-06-30 13F NUVEEN MUN HIGH INCOME OPPOR COM 670682103 26,685 0 0.00 411 6.75 0.0006
2021-05-14 2021-03-31 13F NUVEEN MUN HIGH INCOME OPPOR COM 670682103 26,685 -4 -0.01 385 0.26 0.0006
2021-02-12 2020-12-31 13F NUVEEN MUN HIGH INCOME OPPOR COM 670682103 26,689 3,882 17.02 384 24.68 0.0007
2020-11-16 2020-09-30 13F NUVEEN MUN HIGH INCOME OPPOR COM 670682103 22,807 300 1.33 308 3.70 0.0006
2020-08-14 2020-06-30 13F NUVEEN MUN HIGH INCOME OPPOR COM 670682103 22,507 1,693 8.13 297 15.56 0.0007
2020-05-14 2020-03-31 13F NUVEEN MUN HIGH INCOME OPPOR COM 670682103 20,814 -3,860 -15.64 257 -26.36 0.0007
2020-02-13 2019-12-31 13F NUVEEN MUN HIGH INCOME OPP F COM 670682103 24,674 -7,993 -24.47 349 -25.27 0.0007
2019-11-19 2019-09-30 13F/A-1 NUVEEN MUN HIGH INCOME OPP F COM 670682103 32,667 -69,355 -67.98 467 -67.21 0.0012
2019-11-13 2019-09-30 13F NUVEEN MUN HIGH INCOME OPP F COM 670682103 32,667 -69,355 467 261.7769
2019-08-14 2019-06-30 13F NUVEEN MUN HIGH INCOME OPP F COM 670682103 102,022 -371,656 -78.46 1,424 -77.81 0.0037
2019-05-14 2019-03-31 13F NUVEEN MUN HIGH INCOME OPP F COM 670682103 473,678 -150,128 -24.07 6,417 -11.62 0.0181
2019-02-13 2018-12-31 13F NUVEEN MUN HIGH INCOME OPP F COM 670682103 623,806 51,781 9.05 7,261 1.16 0.0235
2018-11-13 2018-09-30 13F NUVEEN MUN HIGH INCOME OPP F COM 670682103 572,025 207,671 57.00 7,178 55.54 0.0206
2018-08-14 2018-06-30 13F NUVEEN MUN HIGH INCOME OPP F COM 670682103 364,354 197,736 118.68 4,615 121.34 0.0142
2018-05-11 2018-03-31 13F NUVEEN MUN HIGH INCOME OPP F COM 670682103 166,618 136,814 459.05 2,085 413.55 0.0066
2018-02-14 2017-12-31 13F NUVEEN MUN HIGH INCOME OPP F COM 670682103 29,804 2,440 8.92 406 8.85 0.0013
2017-11-13 2017-09-30 13F NUVEEN MUN HIGH INCOME OPP F COM 670682103 27,364 2,000 7.89 373 10.03 0.0013
2017-08-14 2017-06-30 13F NUVEEN MUN HIGH INCOME OPP F COM 670682103 25,364 -200 -0.78 339 1.19 0.0013
2017-05-10 2017-03-31 13F NUVEEN MUN HIGH INCOME OPP F COM 670682103 25,564 10,864 73.90 335 79.14 0.0013
2017-02-16 2016-12-31 13F NUVEEN MUN HIGH INCOME OPP F COM 670682103 14,700 0 0.00 187 -12.62 0.0008
2016-11-15 2016-09-30 13F NUVEEN MUN HIGH INCOME OPP F COM 670682103 14,700 -1,800 -10.91 214 -12.65 0.0010
2016-08-17 2016-06-30 13F NUVEEN MUN HIGH INCOME OPP F COM 670682103 16,500 -1,000 -5.71 245 0.00 0.0011
2016-05-16 2016-03-31 13F NUVEEN MUN HIGH INCOME OPP F COM 670682103 17,500 1,300 8.02 245 9.38 0.0013
2016-03-21 2015-12-31 13F/A-2 NUVEEN MUN HIGH INCOME OPP F COM 670682103 16,200 1,500 10.20 224 14.87 0.0012
2016-02-26 2015-12-31 13F/A-1 NUVEEN MUN HIGH INCOME OPP F COM 670682103 16,200 0 224 0.0012
2016-02-16 2015-12-31 13F NUVEEN MUN HIGH INCOME OPP F COM 670682103 16,200 224
2015-11-16 2015-09-30 13F NUVEEN MUN HIGH INCOME OPP F COM 670682103 14,700 -17,900 -54.91 195 -54.23 0.0011
2015-08-17 2015-06-30 13F/A-1 NUVEEN MUN HIGH INCOME OPP F COM 670682103 32,600 1,000 3.16 426 -2.52 0.0022
2015-08-17 2015-06-30 13F NUVEEN MUN HIGH INCOME OPP F COM 670682103 32,600 426
2015-05-14 2015-03-31 13F NUVEEN MUN HIGH INCOME OPP F COM 670682103 31,600 -1,500 -4.53 437 -1.58 0.0024
2015-02-13 2014-12-31 13F NUVEEN MUN HIGH INCOME OPP F COM 670682103 33,100 -1,075 -3.15 444 -0.45 0.0025
2014-11-13 2014-09-30 13F NUVEEN MUN HIGH INCOME OPP F COM 670682103 34,175 5,075 17.44 446 15.54 0.0039
2014-08-14 2014-06-30 13F NUVEEN MUN HIGH INCOME OPP F COM 670682103 29,100 29,100 386 0.0035
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.