Stock Trading Canary

United States · SEC Form 4 · Snapshot date: 2026-10-18 · Built: 2026-10-18 · 中文

← United States · Coverage record

US · SEC FORM 4

NUVEEN MUNICIPAL HIGH INCOME OPPORTUNITY FUND

NMZ · NYSE · CIK 0001266585 · Closed-End Funds · Asset Management

INSIDER SIGNAL

No active buy signal

3 qualifying P purchase groups
in the current 180-day scoring window

18 Form 4 transaction lines observed in the same window
10 sales · 1 option, withholding, award, gift or other lines

Last qualifying purchase2026-08-04 · BANK OF AMERICA CORP /DE/; MERRILL LYNCH, PIERCE, FENNER & SMITH INC. · $20

WHY NO ACTIVE SIGNAL?

Purchase activityPresent
Recent buying3 qualifying line group(s)
Recent salesModerate
Buy signal statusInactive
Score anatomy

No score is calculated because there is no qualifying purchase in the active window. Unavailable inputs are not treated as zero or as a bearish signal.

ClusterNot calculated
Purchase sizeNot calculated
RoleNot calculated
RecencyNot calculated
ConvictionNot calculated

Why is there no score?

  • No qualifying open-market purchase supplies cluster, size, role, recency or conviction inputs.
  • Sales and other Form 4 activity remain visible as context and do not create a negative score.

Sales and other Form 4 activity are shown separately and do not create a negative buy signal. Absence of buying is not scored as bearish.

Insider activity timeline

Owner lanes show the latest 180 days. Symbol shape identifies the transaction type; sales remain context only.

AprMayJunJulAugSepOct
BANK OF AMERICA CORP /DE/; MERRILL LYNCH, PIERCE, FENNER & SMITH INC.TenPercentOwner
●▼▼●▼●▼
MOSCHNER ALBIN FOther
▼
WELLS FARGO & COMPANY/MN; Wells Fargo Municipal Capital Strategies, LLCTenPercentOwner
○
● Purchase▼ Sale○ Other

—

Purchase breadth & concentration

QUALIFYING BUYERS1
PURCHASE CONCENTRATION100%Largest buyer: BANK OF AMERICA CORP /DE/; MERRILL LYNCH, PIERCE, FENNER & SMITH INC. · $480
CLUSTER BUYING · 15D1 insiderPeak activity: 2026-07-24–2026-08-04

Roles in the peak window: TenPercentOwner. Concentration uses priced qualifying P lines only and does not change the saved score.

SIGNAL HISTORY

No recorded active-signal snapshot

Scores are archived only when the company qualifies for a published US buy-signal snapshot. Last qualifying purchase: 2026-08-04 · BANK OF AMERICA CORP /DE/; MERRILL LYNCH, PIERCE, FENNER & SMITH INC..

Recent Form 4 activity

9Purchases
11Sales
2Other Form 4 lines
8SEC filings · 365 days
BUYING7 qualifying P line(s) · 180 days
SELLING10 sale line(s) · context only
OTHER1 exercise / withholding / award / gift / other lines
10b5-1 / PLANNEDNot assessed

P is an open-market or private purchase. S is a sale. M, F, A and G usually describe exercises, tax withholding, awards and gifts. These categories remain visually separate.

Market context

Market context has not been captured for this ticker yet. The daily market-context job processes the US universe in rotating batches.

Short interest

Short interest is external context reported to FINRA by broker-dealers. It does not affect the Insider Signal.

Shares short
98,644
Previous report
149,994
Avg daily volume
1,414,172
Days to cover
≤ 1.0

FINRA settlement date: 2026-09-30 · Captured 2026-10-12 · FINRA equity short interest ↗. A share count, published about a week after each of two settlement dates a month; not a percentage of shares outstanding.

Historical equity purchases

Qualifying code P transactions in the local Form 4 history, including purchases outside the current signal window.

Transaction dateReporting ownerTypeSecuritySharesAvg. priceApprox. valueSource
2026-08-04BANK OF AMERICA CORP /DE/; MERRILL LYNCH, PIERCE, FENNER & SMITH INC.Purchase (P)COMMON STOCK2USD 10.18USD 20SEC filing ↗
2026-08-03BANK OF AMERICA CORP /DE/; MERRILL LYNCH, PIERCE, FENNER & SMITH INC.Purchase (P)COMMON STOCK36USD 10.21USD 368SEC filing ↗
2026-07-24BANK OF AMERICA CORP /DE/; MERRILL LYNCH, PIERCE, FENNER & SMITH INC.Purchase (P)COMMON STOCK9USD 10.24USD 92SEC filing ↗
2026-03-05Siffermann William APurchase (P)Common Stock100USD 10.48USD 1,048SEC filing ↗
2025-12-19BANK OF AMERICA CORP /DE/; MERRILL LYNCH, PIERCE, FENNER & SMITH INC.Purchase (P)COMMON STOCK1,000USD 10.32USD 10,320SEC filing ↗
2025-10-10BANK OF AMERICA CORP /DE/; MERRILL LYNCH, PIERCE, FENNER & SMITH INC.Purchase (P)COMMON STOCK6,440USD 10.56USD 68,006SEC filing ↗
2025-10-09BANK OF AMERICA CORP /DE/; MERRILL LYNCH, PIERCE, FENNER & SMITH INC.Purchase (P)COMMON STOCK190USD 10.62USD 2,018SEC filing ↗
2025-09-17BANK OF AMERICA CORP /DE/; MERRILL LYNCH, PIERCE, FENNER & SMITH INC.Purchase (P)COMMON STOCK10,784USD 10.65USD 114,850SEC filing ↗
2025-03-21Siffermann William APurchase (P)Common Stock300USD 11.08USD 3,324SEC filing ↗
2025-01-15BANK OF AMERICA CORP /DE/; MERRILL LYNCH, PIERCE, FENNER & SMITH INC.Purchase (P)COMMON STOCK6USD 10.79USD 65SEC filing ↗
2024-12-03BANK OF AMERICA CORP /DE/; MERRILL LYNCH, PIERCE, FENNER & SMITH INC.Purchase (P)COMMON STOCK75USD 11.55USD 866SEC filing ↗
2023-10-26Jones Nathaniel T.Purchase (P)Common Stock1,100USD 8.33USD 9,163SEC filing ↗
2023-08-10MOSCHNER ALBIN FPurchase (P)Common Stock4,900USD 10.38USD 50,878SEC filing ↗
2022-11-28TOTH TERENCE JPurchase (P)Common Stock2,370USD 10.97USD 25,999SEC filing ↗
2022-05-26MOSCHNER ALBIN FPurchase (P)Common Stock1,500USD 12.33USD 18,495SEC filing ↗

Form 4 evidence

22 transaction lines in the latest 365-day window; 50 in local history.

DateOwnerTypeSecuritySharesAvg. priceApprox. valueSource
2026-08-04BANK OF AMERICA CORP /DE/; MERRILL LYNCH, PIERCE, FENNER & SMITH INC.Sale (S)COMMON STOCK3USD 10.26USD 31SEC filing ↗
2026-08-04BANK OF AMERICA CORP /DE/; MERRILL LYNCH, PIERCE, FENNER & SMITH INC.Purchase (P)COMMON STOCK2USD 10.18USD 20SEC filing ↗
2026-08-03BANK OF AMERICA CORP /DE/; MERRILL LYNCH, PIERCE, FENNER & SMITH INC.Sale (S)COMMON STOCK31USD 10.25USD 318SEC filing ↗
Show recent Form 4 evidence (13 grouped rows)
DateOwnerTypeSecuritySharesAvg. priceApprox. valueSource
2026-08-04BANK OF AMERICA CORP /DE/; MERRILL LYNCH, PIERCE, FENNER & SMITH INC.Sale (S)COMMON STOCK3USD 10.26USD 31SEC filing ↗
2026-08-04BANK OF AMERICA CORP /DE/; MERRILL LYNCH, PIERCE, FENNER & SMITH INC.Purchase (P)COMMON STOCK2USD 10.18USD 20SEC filing ↗
2026-08-03BANK OF AMERICA CORP /DE/; MERRILL LYNCH, PIERCE, FENNER & SMITH INC.Sale (S)COMMON STOCK31USD 10.25USD 318SEC filing ↗
2026-08-03BANK OF AMERICA CORP /DE/; MERRILL LYNCH, PIERCE, FENNER & SMITH INC.Purchase (P)COMMON STOCK36USD 10.21USD 368SEC filing ↗
2026-07-31BANK OF AMERICA CORP /DE/; MERRILL LYNCH, PIERCE, FENNER & SMITH INC.Sale (S)COMMON STOCK5USD 10.33USD 52SEC filing ↗
2026-07-24BANK OF AMERICA CORP /DE/; MERRILL LYNCH, PIERCE, FENNER & SMITH INC.Sale (S)COMMON STOCK9USD 10.18USD 92SEC filing ↗
2026-07-24BANK OF AMERICA CORP /DE/; MERRILL LYNCH, PIERCE, FENNER & SMITH INC.Purchase (P)COMMON STOCK9USD 10.24USD 92SEC filing ↗
2026-06-22MOSCHNER ALBIN FSale (S)Common Stock2,912USD 10.36USD 30,175SEC filing ↗
2026-04-27WELLS FARGO & COMPANY/MN; Wells Fargo Municipal Capital Strategies, LLCJ (J)Variable Rate Demand Preferred Shares4,504USD —USD —SEC filing ↗
2026-03-05Siffermann William APurchase (P)Common Stock100USD 10.48USD 1,048SEC filing ↗
2025-12-19BANK OF AMERICA CORP /DE/; MERRILL LYNCH, PIERCE, FENNER & SMITH INC.Sale (S)COMMON STOCK1,000USD 10.54USD 10,540SEC filing ↗
2025-12-19BANK OF AMERICA CORP /DE/; MERRILL LYNCH, PIERCE, FENNER & SMITH INC.Purchase (P)COMMON STOCK1,000USD 10.32USD 10,320SEC filing ↗
2025-12-11BANK OF AMERICA CORP /DE/; Banc of America Preferred Funding CorpJ (J)Adjustable Rate MuniFund Term Preferred Shares1,000USD —USD —SEC filing ↗

Multiple price lines in one filing are grouped and share-weighted. Price and value are blank when a grouped filing line lacks price evidence.

Snapshot & identity

Snapshot date2026-10-18
Ranking versionUS-v1.2
Data qualityPASS ELIGIBLE · —
TickerNMZ
CIK0001266585
SectorClosed-End Funds
IndustryAsset Management Yahoo Finance
SEC SICInvestment company (SEC forms N-2, N-2/A, N-CEN)
ExchangeNYSE

Data coverage

Local Form 4 history50 transaction lines from 2022-05-26 to 2026-08-04
22 P purchase lines · 22 S sale lines · 6 other lines
SEC company submissionsOpen SEC filings ↗

Local ledger as of 2026-10-18. Mapping status is an audit field and does not erase SEC filing evidence.