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[SCHEDULE 13G/A] Pioneer Municipal High Income Fund, Inc. SEC Filing

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SCHEDULE 13G/A

Sit Investment Associates, Inc. (SIA) and its subsidiary Sit Fixed Income Advisors II, LLC (SFI) have jointly filed Amendment No. 1 to Schedule 13G for Pioneer Municipal High Income Fund, Inc. (MHI). As of 31 Jul 2025, the advisers report beneficial ownership of 2,614,270 common shares, equal to 11.5 % of the 22,771,349 shares outstanding.

The stake is held entirely through client accounts; SIA and SFI assert shared voting and dispositive power over the shares and disclaim any direct economic ownership under Rule 13d-4. Both entities are registered investment advisers (Item 3 class “IA”) and certify the holdings were acquired in the ordinary course of business without intent to influence control of the issuer. Paul E. Rasmussen, Vice President, signed on 05 Aug 2025.

No other persons or subsidiaries are identified as part of a group, and there are no disclosures of transactions, sales, or ownership below 5 %.

Sit Investment Associates, Inc. (SIA) e la sua controllata Sit Fixed Income Advisors II, LLC (SFI) hanno presentato congiuntamente l'Emendamento n. 1 al Modulo 13G per Pioneer Municipal High Income Fund, Inc. (MHI). Al 31 luglio 2025, i consulenti dichiarano una partecipazione beneficiaria di 2.614.270 azioni ordinarie, pari al 11,5% delle 22.771.349 azioni in circolazione.

La quota è detenuta interamente tramite conti clienti; SIA e SFI affermano di avere potere condiviso di voto e disposizione sulle azioni e declinano qualsiasi proprietà economica diretta ai sensi della Regola 13d-4. Entrambe le entità sono consulenti di investimento registrati (Voce 3 classe “IA”) e certificano che le partecipazioni sono state acquisite nell'ordinaria attività commerciale senza l'intento di influenzare il controllo dell'emittente. Paul E. Rasmussen, Vicepresidente, ha firmato il 5 agosto 2025.

Non sono state identificate altre persone o controllate come parte di un gruppo, e non vi sono divulgazioni di transazioni, vendite o proprietà inferiori al 5%.

Sit Investment Associates, Inc. (SIA) y su subsidiaria Sit Fixed Income Advisors II, LLC (SFI) han presentado conjuntamente la Enmienda No. 1 al Anexo 13G para Pioneer Municipal High Income Fund, Inc. (MHI). Al 31 de julio de 2025, los asesores reportan una propiedad beneficiaria de 2,614,270 acciones comunes, equivalentes al 11.5 % de las 22,771,349 acciones en circulación.

La participación se mantiene totalmente a través de cuentas de clientes; SIA y SFI afirman tener poder compartido de voto y disposición sobre las acciones y niegan cualquier propiedad económica directa conforme a la Regla 13d-4. Ambas entidades son asesores de inversión registrados (Ítem 3 clase “IA”) y certifican que las participaciones fueron adquiridas en el curso ordinario del negocio sin intención de influir en el control del emisor. Paul E. Rasmussen, Vicepresidente, firmó el 5 de agosto de 2025.

No se identifican otras personas o subsidiarias como parte de un grupo, ni hay divulgaciones de transacciones, ventas o propiedad por debajo del 5%.

Sit Investment Associates, Inc.(SIA)와 자회사 Sit Fixed Income Advisors II, LLC(SFI)는 Pioneer Municipal High Income Fund, Inc.(MHI)에 대한 Schedule 13G 수정안 1호를 공동 제출했습니다. 2025년 7월 31일 기준으로, 자문사들은 2,614,270주의 보통주에 대한 실질 소유권을 보고했으며, 이는 총 22,771,349주 중 11.5%에 해당합니다.

지분은 전적으로 고객 계정을 통해 보유되어 있으며, SIA와 SFI는 주식에 대한 공동 의결권 및 처분권을 주장하며, Rule 13d-4에 따라 직접적인 경제적 소유권은 부인합니다. 두 기관 모두 등록 투자 자문사(Item 3 클래스 “IA”)이며, 보유 주식은 발행사의 통제에 영향을 미칠 의도 없이 정상적인 영업 과정에서 취득되었음을 증명합니다. 부사장 Paul E. Rasmussen이 2025년 8월 5일 서명했습니다.

다른 인물이나 자회사는 그룹의 일부로 식별되지 않았으며, 5% 미만의 거래, 매각 또는 소유권에 대한 공시도 없습니다.

Sit Investment Associates, Inc. (SIA) et sa filiale Sit Fixed Income Advisors II, LLC (SFI) ont conjointement déposé l'Amendement n° 1 au Schedule 13G pour Pioneer Municipal High Income Fund, Inc. (MHI). Au 31 juillet 2025, les conseillers déclarent une propriété bénéficiaire de 2 614 270 actions ordinaires, représentant 11,5 % des 22 771 349 actions en circulation.

Cette participation est détenue entièrement par le biais de comptes clients ; SIA et SFI affirment détenir un pouvoir conjoint de vote et de disposition sur les actions et déclinent toute propriété économique directe conformément à la Règle 13d-4. Les deux entités sont des conseillers en investissement enregistrés (Article 3 classe « IA ») et certifient que les avoirs ont été acquis dans le cours normal des affaires sans intention d'influencer le contrôle de l'émetteur. Paul E. Rasmussen, vice-président, a signé le 5 août 2025.

Aucune autre personne ou filiale n'est identifiée comme faisant partie d'un groupe, et aucune divulgation de transactions, ventes ou propriété inférieure à 5 % n'est mentionnée.

Sit Investment Associates, Inc. (SIA) und ihre Tochtergesellschaft Sit Fixed Income Advisors II, LLC (SFI) haben gemeinsam Änderungsantrag Nr. 1 zum Schedule 13G für Pioneer Municipal High Income Fund, Inc. (MHI) eingereicht. Zum 31. Juli 2025 melden die Berater eine wirtschaftliche Eigentümerschaft von 2.614.270 Stammaktien, was 11,5 % der 22.771.349 ausstehenden Aktien entspricht.

Der Anteil wird ausschließlich über Kundenkonten gehalten; SIA und SFI geben an, über die Aktien gemeinsames Stimm- und Verfügungsrecht zu verfügen und lehnen jeglichen direkten wirtschaftlichen Eigentumsvorbehalt gemäß Regel 13d-4 ab. Beide Einheiten sind registrierte Anlageberater (Punkt 3 Klasse „IA“) und bestätigen, dass die Beteiligungen im normalen Geschäftsverlauf ohne Absicht zur Beeinflussung der Kontrolle des Emittenten erworben wurden. Paul E. Rasmussen, Vizepräsident, unterzeichnete am 5. August 2025.

Es wurden keine weiteren Personen oder Tochtergesellschaften als Teil einer Gruppe identifiziert, und es gibt keine Offenlegungen von Transaktionen, Verkäufen oder Eigentumsanteilen unter 5 %.

Positive
  • Institutional ownership exceeds 10 %, with SIA/SFI reporting 2.61 million shares (11.5 %), highlighting professional confidence in MHI.
Negative
  • None.

Insights

TL;DR: Passive advisers now hold 11.5 % of MHI, signaling institutional interest but no control intent.

The combined SIA/SFI position crosses the 10 % threshold, requiring this 13G update. Because the advisers act on behalf of client accounts and expressly disclaim ownership intent, the filing is informational rather than strategic. The disclosure may be modestly supportive for valuation by highlighting demand from a reputable fixed-income manager, yet it does not indicate activism, takeover risk, or capital changes. Market impact should be limited unless future amendments show material position shifts.

TL;DR: An 11.5 % passive stake by Sit enhances float stability and signals confidence in tax-exempt high-yield strategy.

SIA/SFI’s sizable, jointly controlled position can reduce near-term share overhang and improve liquidity as the advisers are long-term, income-focused investors. While not activist, their presence may marginally tighten the free float, potentially aiding NAV discount narrowing if other buyers follow. However, because the shares are held for multiple discretionary accounts, block exits remain possible over time.

Sit Investment Associates, Inc. (SIA) e la sua controllata Sit Fixed Income Advisors II, LLC (SFI) hanno presentato congiuntamente l'Emendamento n. 1 al Modulo 13G per Pioneer Municipal High Income Fund, Inc. (MHI). Al 31 luglio 2025, i consulenti dichiarano una partecipazione beneficiaria di 2.614.270 azioni ordinarie, pari al 11,5% delle 22.771.349 azioni in circolazione.

La quota è detenuta interamente tramite conti clienti; SIA e SFI affermano di avere potere condiviso di voto e disposizione sulle azioni e declinano qualsiasi proprietà economica diretta ai sensi della Regola 13d-4. Entrambe le entità sono consulenti di investimento registrati (Voce 3 classe “IA”) e certificano che le partecipazioni sono state acquisite nell'ordinaria attività commerciale senza l'intento di influenzare il controllo dell'emittente. Paul E. Rasmussen, Vicepresidente, ha firmato il 5 agosto 2025.

Non sono state identificate altre persone o controllate come parte di un gruppo, e non vi sono divulgazioni di transazioni, vendite o proprietà inferiori al 5%.

Sit Investment Associates, Inc. (SIA) y su subsidiaria Sit Fixed Income Advisors II, LLC (SFI) han presentado conjuntamente la Enmienda No. 1 al Anexo 13G para Pioneer Municipal High Income Fund, Inc. (MHI). Al 31 de julio de 2025, los asesores reportan una propiedad beneficiaria de 2,614,270 acciones comunes, equivalentes al 11.5 % de las 22,771,349 acciones en circulación.

La participación se mantiene totalmente a través de cuentas de clientes; SIA y SFI afirman tener poder compartido de voto y disposición sobre las acciones y niegan cualquier propiedad económica directa conforme a la Regla 13d-4. Ambas entidades son asesores de inversión registrados (Ítem 3 clase “IA”) y certifican que las participaciones fueron adquiridas en el curso ordinario del negocio sin intención de influir en el control del emisor. Paul E. Rasmussen, Vicepresidente, firmó el 5 de agosto de 2025.

No se identifican otras personas o subsidiarias como parte de un grupo, ni hay divulgaciones de transacciones, ventas o propiedad por debajo del 5%.

Sit Investment Associates, Inc.(SIA)와 자회사 Sit Fixed Income Advisors II, LLC(SFI)는 Pioneer Municipal High Income Fund, Inc.(MHI)에 대한 Schedule 13G 수정안 1호를 공동 제출했습니다. 2025년 7월 31일 기준으로, 자문사들은 2,614,270주의 보통주에 대한 실질 소유권을 보고했으며, 이는 총 22,771,349주 중 11.5%에 해당합니다.

지분은 전적으로 고객 계정을 통해 보유되어 있으며, SIA와 SFI는 주식에 대한 공동 의결권 및 처분권을 주장하며, Rule 13d-4에 따라 직접적인 경제적 소유권은 부인합니다. 두 기관 모두 등록 투자 자문사(Item 3 클래스 “IA”)이며, 보유 주식은 발행사의 통제에 영향을 미칠 의도 없이 정상적인 영업 과정에서 취득되었음을 증명합니다. 부사장 Paul E. Rasmussen이 2025년 8월 5일 서명했습니다.

다른 인물이나 자회사는 그룹의 일부로 식별되지 않았으며, 5% 미만의 거래, 매각 또는 소유권에 대한 공시도 없습니다.

Sit Investment Associates, Inc. (SIA) et sa filiale Sit Fixed Income Advisors II, LLC (SFI) ont conjointement déposé l'Amendement n° 1 au Schedule 13G pour Pioneer Municipal High Income Fund, Inc. (MHI). Au 31 juillet 2025, les conseillers déclarent une propriété bénéficiaire de 2 614 270 actions ordinaires, représentant 11,5 % des 22 771 349 actions en circulation.

Cette participation est détenue entièrement par le biais de comptes clients ; SIA et SFI affirment détenir un pouvoir conjoint de vote et de disposition sur les actions et déclinent toute propriété économique directe conformément à la Règle 13d-4. Les deux entités sont des conseillers en investissement enregistrés (Article 3 classe « IA ») et certifient que les avoirs ont été acquis dans le cours normal des affaires sans intention d'influencer le contrôle de l'émetteur. Paul E. Rasmussen, vice-président, a signé le 5 août 2025.

Aucune autre personne ou filiale n'est identifiée comme faisant partie d'un groupe, et aucune divulgation de transactions, ventes ou propriété inférieure à 5 % n'est mentionnée.

Sit Investment Associates, Inc. (SIA) und ihre Tochtergesellschaft Sit Fixed Income Advisors II, LLC (SFI) haben gemeinsam Änderungsantrag Nr. 1 zum Schedule 13G für Pioneer Municipal High Income Fund, Inc. (MHI) eingereicht. Zum 31. Juli 2025 melden die Berater eine wirtschaftliche Eigentümerschaft von 2.614.270 Stammaktien, was 11,5 % der 22.771.349 ausstehenden Aktien entspricht.

Der Anteil wird ausschließlich über Kundenkonten gehalten; SIA und SFI geben an, über die Aktien gemeinsames Stimm- und Verfügungsrecht zu verfügen und lehnen jeglichen direkten wirtschaftlichen Eigentumsvorbehalt gemäß Regel 13d-4 ab. Beide Einheiten sind registrierte Anlageberater (Punkt 3 Klasse „IA“) und bestätigen, dass die Beteiligungen im normalen Geschäftsverlauf ohne Absicht zur Beeinflussung der Kontrolle des Emittenten erworben wurden. Paul E. Rasmussen, Vizepräsident, unterzeichnete am 5. August 2025.

Es wurden keine weiteren Personen oder Tochtergesellschaften als Teil einer Gruppe identifiziert, und es gibt keine Offenlegungen von Transaktionen, Verkäufen oder Eigentumsanteilen unter 5 %.






Check the appropriate box to designate the rule pursuant to which this Schedule is filed:
Rule 13d-1(b)
Rule 13d-1(c)
Rule 13d-1(d)






SCHEDULE 13G





SCHEDULE 13G





SCHEDULE 13G



Sit Investment Associates, Inc.
Signature:/s/ Paul E. Rasmussen
Name/Title:Paul Rasmussen / Vice President
Date:08/05/2025
Sit Fixed Income Advisors II, LLC
Signature:/s/ Paul E. Rasmussen
Name/Title:Paul Rasmussen / Vice President
Date:08/05/2025
Exhibit Information

Exhibit A - Joint Filing Agreement

FAQ

How many MHI shares do Sit Investment Associates and Sit Fixed Income Advisors II jointly own?

They report beneficial ownership of 2,614,270 common shares.

What percentage of Pioneer Municipal High Income Fund’s outstanding stock does this represent?

The holding equals 11.5 % of the 22,771,349 shares outstanding.

Do Sit Investment Associates and its subsidiary have sole or shared voting power over the MHI shares?

They have shared voting and dispositive power; sole power is 0.

Is the filing activist in nature?

No. The advisers certify the stake was acquired in the ordinary course and not to influence control of the issuer.

When was the event date triggering this Schedule 13G amendment?

The event date is 31 July 2025.

What is the classification of the reporting persons under SEC rules?

Both entities are classified as Investment Advisers (IA) under Item 3.
Pioneer Municipal High Income

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