Pioneer Municipal High Income Fund, Inc. (MHI)
MHI moved a median of 0.00% 30 minutes after news, and 0.00% by the close. How MHI actually reacts to news — the realized, point-in-time move the market made, measured across 133 labeled events over the last three years with zero look-ahead.
MHI’s median reaction, across the day.
| Horizon | Median | % positive | Events |
|---|---|---|---|
| 5-min | 0.00% | 35% | 97 |
| 30-min | 0.00% | 50% | 126 |
| 60-min | 0.00% | 48% | 132 |
| to close | 0.00% | 41% | 133 |
| Middle 50% of MHI reactions | -0.10% to +0.15% |
|---|---|
| Median reaction (30-min) | 0.00% |
| Measured reactions | 133 |
Half of all Pioneer Municipal High Income Fund, Inc. news events land between -0.10% and +0.15% at 30 minutes.
Reaction stats as of 2026-09-21. Newest measured event . Reaction = percent move vs. the price at the news timestamp.
Email me when MHI moves on news.
One email per qualifying move — the headline, the measured reaction, and how it compares to MHI's baseline. Nothing else.
Recent MHI events, each with its measured reaction.
| Date | Headline | Event | Source | 5-min | To close |
|---|---|---|---|---|---|
| Form N-23C-2 PIONEER MUNICIPAL HIGH For: Jul 17 | SEC filing · Form N-23C-2 | SEC EDGAR | — | -0.22% | |
| Form N-CEN PIONEER MUNICIPAL HIGH For: Apr 30 | SEC filing · Form N-CEN | SEC EDGAR | — | +0.11% | |
| Form N-CSR PIONEER MUNICIPAL HIGH For: Apr 30 | SEC filing · Form N-CSR | SEC EDGAR | -0.11% | -0.22% | |
| Form NPORT-P PIONEER MUNICIPAL HIGH For: Apr 30 | SEC filing · Form NPORT-P | SEC EDGAR | +0.00% | +0.22% | |
| Form 8-K PIONEER MUNICIPAL HIGH For: May 07 | SEC filing · Form 8-K | SEC EDGAR | +0.43% | +0.86% | |
| Form 8-K PIONEER MUNICIPAL HIGH For: Apr 01 | SEC filing · Form 8-K | SEC EDGAR | +0.00% | -0.33% | |
| Form DEFA14A PIONEER MUNICIPAL HIGH | SEC filing · Form DEFA14A | SEC EDGAR | +0.05% | -0.75% | |
| Form NPORT-P PIONEER MUNICIPAL HIGH For: Jan 31 | SEC filing · Form NPORT-P | SEC EDGAR | -0.32% | -0.74% | |
| Pioneer Closed-End Funds Announce Postponement of March 26, 2025 Special Meeting of Stockholders | Press release | Business Wire | +0.05% | -0.75% | |
| Pioneer Closed-End Funds Required Notice to Shareholders Sources of Distribution Under Section 19(a) | Press release | Business Wire | +0.59% | -0.11% | |
| Form N-CSRS PIONEER MUNICIPAL HIGH For: Oct 31 | SEC filing · Form N-CSRS | SEC EDGAR | +0.00% | +0.11% | |
| Form NPORT-P PIONEER MUNICIPAL HIGH For: Oct 31 | SEC filing · Form NPORT-P | SEC EDGAR | — | +0.11% | |
| Pioneer Closed-End Funds Required Notice to Shareholders Sources of Distribution Under Section 19(a) | Press release | Business Wire | +0.11% | -0.53% | |
| Form NPORT-P PIONEER MUNICIPAL HIGH For: Jul 31 | SEC filing · Form NPORT-P | SEC EDGAR | — | -0.31% | |
| Form N-PX PIONEER MUNICIPAL HIGH For: Jun 30 | SEC filing · Form N-PX | SEC EDGAR | +0.53% | +0.48% | |
| Form N-CEN PIONEER MUNICIPAL HIGH For: Apr 30 | SEC filing · Form N-CEN | SEC EDGAR | — | +0.00% | |
| Form N-CSR PIONEER MUNICIPAL HIGH For: Apr 30 | SEC filing · Form N-CSR | SEC EDGAR | — | -0.87% | |
| Form NPORT-P PIONEER MUNICIPAL HIGH For: Apr 30 | SEC filing · Form NPORT-P | SEC EDGAR | +0.16% | -0.11% | |
| Pioneer Closed-End Funds Required Notice to Shareholders Sources of Distribution Under Section 19(A) | Press release | Business Wire | -0.23% | +0.11% | |
| Pioneer Closed-End Funds Required Notice to Shareholders Sources of Distribution Under Section 19(a) | Press release | Business Wire | +0.71% | +0.71% | |
| Pioneer Closed-End Funds Required Notice to Shareholders Sources of Distribution Under Section 19(a) | Press release | Business Wire | -0.17% | +0.34% | |
| Form NPORT-P PIONEER MUNICIPAL HIGH For: Jan 31 | SEC filing · Form NPORT-P | SEC EDGAR | — | +0.11% | |
| Pioneer Closed-End Funds Required Notice to Shareholders Sources of Distribution Under Section 19(a) | Press release | Business Wire | +0.11% | +0.34% | |
| Amundi US Announces Portfolio Management Changes for Pioneer Municipal Closed-End Funds | Press release | Business Wire | +0.00% | -0.11% | |
| Form N-23C-2 PIONEER MUNICIPAL HIGH For: Jan 29 | SEC filing · Form N-23C-2 | SEC EDGAR | — | +0.65% | |
| Form N-CSRS PIONEER MUNICIPAL HIGH For: Oct 31 | SEC filing · Form N-CSRS | SEC EDGAR | -0.12% | +0.00% | |
| Form NPORT-P PIONEER MUNICIPAL HIGH For: Oct 31 | SEC filing · Form NPORT-P | SEC EDGAR | +0.06% | +0.00% | |
| Form N-CEN/A PIONEER MUNICIPAL HIGH For: Apr 30 | SEC filing · Form N-CEN | SEC EDGAR | -0.28% | -1.56% |
Each reaction is the move the market actually made, measured from the news timestamp. Headlines link through to the MHI section they belong to.
Where else MHI is measured.
MHI earnings → · Analyst actions → · SEC filings →
Other Financial Services names, measured the same way
| Ticker | Events | Median 30-min | % positive |
|---|---|---|---|
| BANK RAKYAT UNSP/ADR B (BKRKY) | 133 | -0.75% | 22% |
| Dragon Victory International Limited - Ordinary Shares (LYL) | 133 | -0.20% | 33% |
| OP Bancorp (OPBK) | 133 | +0.08% | 53% |
| ABSA GROUP LTD S/ADR (AGRPY) | 132 | 0.00% | 8% |
Same sector, same measurement: percent move vs. the price at the news timestamp, read at 30 minutes. Sample sizes differ, so the medians are comparable but the confidence behind them is not.
All Financial Services names, measured the same way →
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Every name we’ve measured, in one place.
How the numbers are made.
How is Pioneer Municipal High Income Fund, Inc.'s median reaction calculated?
Every labeled MHI news event is measured from its own timestamp: the last trade before the news is the base price, and the move is read at fixed horizons — 30 minutes of trading, then the close. The median across 133 events is what this page reports. Point-in-time, zero look-ahead: no event borrows information from a later one.
What counts as a positive reaction?
Any event whose price move is above zero at the horizon, relative to the last trade before the news timestamp. 50% of MHI's measured events are up at 30 minutes; the rest close the window flat or negative.
How often is this page updated?
The news table refreshes automatically as new events are labeled and priced. The reaction medians are re-pulled in batches from the dataset — the figures here are as of 2026-09-21.
Does MHI's past reaction predict its next one?
No. These are realized facts about past events, not forecasts. They describe a distribution — they say nothing certain about any future move.