Blackrock Muniassets Fund (MUA)

Blackrock Muniassets Fund on one page: short interest, daily short volume, fails to deliver, large holders, 13F holders and insider trades. Listed on NYSE.

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59K

Short interest

settlement 2026-09-15

1.0

Days to cover

-1.2 days vs prior

28.0%

Short share of volume

2026-10-08

2,799

Fails to deliver

settlement 2026-09-11

Insider flow, 90 days

0 buys, 0 sells

As of 2026-10-08.

Short interest

FINRA, twice a month. The newest 24 settlements in the table, 48 in the chart. JSON

As of 15 September 2026, short interest in MUA is 58,845 shares, down 1,826,349 shares over the last month. Over the last 48 readings it ranged from 9,836 shares (15 April 2025) to 1,885,194 shares (14 August 2026). The latest reading sits at the bottom of that range. At the reported average volume of 402K shares a day that is 1.0 days to cover.

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Settlement	Shares short	Change	Avg daily volume	Days to cover
2026-09-15	58,845	-92.9%	402,335	1.00
2026-08-31	826,593	-56.1%	369,065	2.24
2026-08-14	1,885,194	+20.9%	295,369	6.38
2026-07-31	1,559,566	+3378.8%	353,224	4.42
2026-07-15	44,831	+69.5%	90,279	1.00
2026-06-30	26,441	+70.1%	138,090	1.00
2026-06-15	15,544	-37.6%	89,589	1.00
2026-05-29	24,928	-56.1%	99,995	1.00
2026-05-15	56,832	+223.6%	117,456	1.00
2026-04-30	17,565	-26.3%	97,672	1.00
2026-04-15	23,836	-36.4%	123,865	1.00
2026-03-31	37,493	-17.7%	107,227	1.00
2026-03-13	45,559	+4.0%	95,750	1.00
2026-02-27	43,815	-75.1%	80,554	1.00
2026-02-13	175,842	+69.9%	99,305	1.77
2026-01-30	103,506	+117.2%	96,880	1.07
2026-01-15	47,662	+18.2%	69,801	1.00
2025-12-31	40,320	-33.7%	211,046	1.00
2025-12-15	60,847	+317.1%	134,492	1.00
2025-11-28	14,589	-48.6%	119,210	1.00
2025-11-14	28,373	-51.9%	96,314	1.00
2025-10-31	58,950	+101.1%	106,917	1.00
2025-10-15	29,310	-65.0%	115,281	1.00
2025-09-30	83,790	-20.2%	96,074	1.00

Daily short volume

FINRA Reg SHO, the last 30 sessions. JSON

As of 8 October 2026, the short share of MUA volume is 28.0%, down 32.2 points over the last five sessions. Over the last 30 readings it ranged from 26.6% (27 August 2026) to 60.2% (1 October 2026). The latest reading sits at the bottom of that range. The latest reading is 13.2 points below the 30-session average of 41.2%, on 207K shares reported.

Date	Short volume	Total volume	Short share	Exempt
2026-10-08	58K	207K	28.0%	0
2026-10-07	84K	237K	35.6%	0
2026-10-06	65K	244K	26.8%	0
2026-10-05	99K	189K	52.1%	0
2026-10-02	60K	159K	37.8%	0
2026-10-01	130K	216K	60.2%	0
2026-09-30	187K	441K	42.5%	5,133
2026-09-29	234K	614K	38.2%	0
2026-09-28	245K	676K	36.2%	0
2026-09-25	91K	163K	56.0%	0
2026-09-24	124K	363K	34.0%	0
2026-09-23	160K	299K	53.5%	0
2026-09-22	149K	327K	45.6%	92
2026-09-21	85K	180K	47.3%	0
2026-09-18	76K	164K	46.5%	0
2026-09-17	159K	315K	50.6%	0
2026-09-16	153K	389K	39.3%	0
2026-09-15	115K	240K	48.0%	0
2026-09-14	89K	251K	35.6%	112
2026-09-11	55K	160K	34.3%	0
2026-09-10	160K	401K	39.8%	1,200
2026-09-09	61K	156K	39.4%	440
2026-09-08	123K	226K	54.4%	0
2026-09-04	90K	230K	39.0%	10,432
2026-09-03	73K	189K	38.4%	2,526
2026-09-02	134K	379K	35.4%	1,017
2026-09-01	116K	262K	44.1%	466
2026-08-31	67K	193K	34.9%	0
2026-08-28	98K	282K	34.6%	0
2026-08-27	51K	191K	26.6%	0

Fails to deliver

SEC, the last 30 settlement dates with a fail. JSON

As of 11 September 2026, the fails-to-deliver balance in MUA is 2,799 shares, down 12,571 shares over the last settlement date. Over the last 30 readings it ranged from 741 shares (3 September 2026) to 419,932 shares (26 August 2026). The latest reading sits at the bottom of that range.

Settlement	Shares failed	Price	Value
2026-09-11	2,799	$9.77	$27K
2026-09-10	15,370	$9.84	$151K
2026-09-09	9,124	$9.89	$90K
2026-09-04	1,620	$9.92	$16K
2026-09-03	741	$9.92	$7K
2026-09-01	1,078	$9.93	$11K
2026-08-28	63,872	$9.97	$637K
2026-08-27	88,743	$9.98	$886K
2026-08-26	419,932	$9.99	$4.2M
2026-08-25	304,944	$9.94	$3.0M
2026-08-24	290,456	$10.04	$2.9M
2026-08-21	327,711	$10.02	$3.3M
2026-08-20	301,622	$10.07	$3.0M
2026-08-19	126,718	$10.06	$1.3M
2026-08-18	97,306	$10.09	$982K
2026-08-17	62,211	$10.23	$636K
2026-08-14	99,679	$10.34	$1.0M
2026-08-13	181,962	$10.24	$1.9M
2026-08-12	185,361	$10.18	$1.9M
2026-08-11	160,527	$10.20	$1.6M
2026-08-10	161,168	$10.26	$1.7M
2026-08-07	95,695	$10.18	$974K
2026-08-06	3,645	$10.13	$37K
2026-08-03	13,010	$10.10	$131K
2026-07-31	3,046	$10.17	$31K
2026-07-30	30,195	$10.24	$309K
2026-07-29	48,918	$10.28	$503K
2026-07-28	7,782	$10.51	$82K
2026-07-27	17,035	$10.46	$178K
2026-07-24	5,467	$10.50	$57K

Insider trades

SEC Form 4, newest first, 50 of 100 shown. JSON

No open-market insider trades were reported for MUA in the last 90 days. The most recent filings are listed below. Latest filing: HUBBARD ROBERT GLENN (Director) on 2026-02-23.

Date	Insider	Title	Type	Shares	Price	Value	Owned after
2026-02-23	HUBBARD ROBERT GLENN	Director	J	261	$11.36	$3K	261
2026-02-23	HUBBARD ROBERT GLENN	Director	J	261	$11.36	$3K	261
2026-02-23	Romaglino Christian	Director	J	1K	$11.36	$12K	1K
2026-02-23	KESTER W CARL	Director	J	88	$11.36	$1000	188
2026-02-23	Harris Stayce D.	Director	J	9	$11.36	$102	20
2026-01-30	Maloney Kevin	Other	Disposition	385	$11.07	$4K	0
2026-01-30	Maloney Kevin	Other	Option exercise	385	price not stated in the filing	not stated	385
2026-01-30	Soccio Phillip	Other	Disposition	711	$11.07	$8K	0
2026-01-30	Soccio Phillip	Other	Option exercise	711	price not stated in the filing	not stated	711
2026-01-30	OCONNOR WALTER	Other	Disposition	1K	$11.07	$12K	0
2026-01-30	OCONNOR WALTER	Other	Option exercise	1K	price not stated in the filing	not stated	1K
2025-01-31	Maloney Kevin	Other	Disposition	36	$11.05	$401	0
2025-01-31	Maloney Kevin	Other	Option exercise	36	price not stated in the filing	not stated	36
2025-01-31	OCONNOR WALTER	Other	Disposition	309	$11.05	$3K	0
2025-01-31	OCONNOR WALTER	Other	Option exercise	309	price not stated in the filing	not stated	309
2025-01-31	Soccio Phillip	Other	Option exercise	238	price not stated in the filing	not stated	238
2025-01-31	Soccio Phillip	Other	Disposition	238	$11.05	$3K	0
2024-10-29	Harris Stayce D.	Director	Buy	10	$11.46	$115	10
2024-04-11	Banc of America Preferred Funding Corp	TenPercentOwner	J	2K	price not stated in the filing	not stated	0
2024-01-31	Soccio Phillip	Other	Disposition	39	$10.91	$424	0
2024-01-31	Soccio Phillip	Other	Option exercise	39	price not stated in the filing	not stated	39
2024-01-31	OCONNOR WALTER	Other	Disposition	143	$10.91	$2K	0
2024-01-31	OCONNOR WALTER	Other	Option exercise	143	price not stated in the filing	not stated	143
2024-01-31	Maloney Kevin	Other	Option exercise	34	price not stated in the filing	not stated	34
2024-01-31	Maloney Kevin	Other	Disposition	34	$10.91	$374	0
2023-12-27	BANK OF AMERICA CORP /DE/	10% owner	Buy	300	$10.56	$3K	3K
2023-12-27	BANK OF AMERICA CORP /DE/	10% owner	Buy	100	$10.56	$1K	2K
2023-12-27	BANK OF AMERICA CORP /DE/	10% owner	Buy	100	$10.56	$1K	2K
2023-12-27	BANK OF AMERICA CORP /DE/	10% owner	Buy	100	$10.56	$1K	2K
2023-12-27	BANK OF AMERICA CORP /DE/	10% owner	Buy	100	$10.56	$1K	2K
2023-12-27	BANK OF AMERICA CORP /DE/	10% owner	Buy	100	$10.56	$1K	2K
2023-12-27	BANK OF AMERICA CORP /DE/	10% owner	Buy	100	$10.56	$1K	2K
2023-12-27	BANK OF AMERICA CORP /DE/	10% owner	Buy	100	$10.56	$1K	1K
2023-12-27	BANK OF AMERICA CORP /DE/	10% owner	Buy	100	$10.56	$1K	1K
2023-12-27	BANK OF AMERICA CORP /DE/	10% owner	Buy	100	$10.56	$1K	1K
2023-12-27	BANK OF AMERICA CORP /DE/	10% owner	Buy	100	$10.56	$1K	1K
2023-12-27	BANK OF AMERICA CORP /DE/	10% owner	Buy	100	$10.56	$1K	1K
2023-12-27	BANK OF AMERICA CORP /DE/	10% owner	Buy	100	$10.56	$1K	900
2023-12-27	BANK OF AMERICA CORP /DE/	10% owner	Buy	100	$10.56	$1K	800
2023-12-27	BANK OF AMERICA CORP /DE/	10% owner	Buy	100	$10.56	$1K	700
2023-12-27	BANK OF AMERICA CORP /DE/	10% owner	Buy	100	$10.56	$1K	600
2023-12-27	BANK OF AMERICA CORP /DE/	10% owner	Buy	100	$10.56	$1K	500
2023-12-27	BANK OF AMERICA CORP /DE/	10% owner	Buy	100	$10.55	$1K	300
2023-12-27	BANK OF AMERICA CORP /DE/	10% owner	Buy	100	$10.55	$1K	200
2023-12-27	BANK OF AMERICA CORP /DE/	10% owner	Buy	5	$10.56	$53	5
2023-12-27	BANK OF AMERICA CORP /DE/	TenPercentOwner	Buy	5	$10.56	$53	10
2023-12-27	BANK OF AMERICA CORP /DE/	TenPercentOwner	Buy	6	$10.55	$63	16
2023-12-27	BANK OF AMERICA CORP /DE/	TenPercentOwner	Buy	16	$10.54	$169	32
2023-12-27	BANK OF AMERICA CORP /DE/	TenPercentOwner	Buy	17	$10.56	$180	49
2023-12-27	BANK OF AMERICA CORP /DE/	TenPercentOwner	Buy	24	$10.56	$253	73

Form 4 filings are due within two business days of the trade. Insiders sell for many reasons that say nothing about the company; open-market buys are rarer.

Large holders (13D and 13G)

One row per reporting person with its latest filing, newest first. JSON

2 holders report 5% or more of MUA in their latest filing, all on Schedule 13G (passive). The largest reported stake is SIT FIXED INCOME ADVISORS II LLC /ADV at 10.6% of the class (7,135,290 shares), filed 2026-10-02 for an event on 2026-09-30.

Filed	Form	Holder	Shares	Of class	Event
2026-10-02	13G	SIT FIXED INCOME ADVISORS II LLC /ADVinvestment adviser	7.1M	10.6%	2026-09-30
2026-10-02	13G	SIT INVESTMENT ASSOCIATES INCinvestment adviser	7.1M	10.6%	2026-09-30

13F holders

Tracked managers holding MUA at their latest 13F. JSON

1 of the 30 tracked managers held MUA at their latest 13F, $178K in total at quarter-end prices. Citadel Advisors is the largest at $178K (0.0% of its portfolio) as of 2026-06-30. Over the prior quarter 1 added shares and 0 cut.

Fund	Quarter	Shares	Value	Of portfolio	Change in shares
Citadel Advisors	2026-06-30	16K	$178K	0.00%	new

Only the 30 tracked managers on the funds hub; a 13F reports long positions in US listed stock at quarter end, 45 days late, and says nothing about shorts or positions sold since.

What this page is

Blackrock Muniassets Fund in the regulatory record

Regulators publish company data in separate files that never sit next to each other: FINRA's twice-monthly short interest, its daily short sale volume, the SEC's fails-to-deliver counts, and each insider's Form 4. A company page puts those series for one ticker on one URL, with planned sales, large holders, 13F holders and financials beside them, so the short position, the daily flow, the settlement fails and what insiders are doing can be read together.

Each section has its own history table, a one-line summary of the latest figures and its own JSON and CSV links, and says when its source last updated.

This page follows Blackrock Muniassets Fund (MUA), SEC CIK 901243, listed on NYSE. The cross-market tables live on the short interest and insider transactions hubs.

Source and updates

Short interest: FINRA consolidated short interestSource: FINRA.Twice a month, about eight business days after settlement. Latest 2026-09-15.JSON and CSV
Daily short volume: FINRA Reg SHO daily filesSource: FINRA.Every trading day, the morning after FINRA posts it. Latest 2026-10-08.JSON and CSV
Fails to deliver: SEC fails-to-deliver dataSource: SEC.Twice a month, a few weeks after the half month ends. Latest 2026-09-11.JSON and CSV
Large holders: SEC EDGAR Schedule 13D and 13GSource: SEC.New filings appear shortly after the SEC posts them. A 13D is due within five business days of crossing 5%; a 13G follows the passive schedule. Latest 2026-10-02.JSON and CSV
13F holders: SEC EDGAR Form 13F-HRSource: SEC.Quarterly, filed within 45 days of quarter end; 30 tracked managers. Latest 2026-06-30.JSON and CSV
Insider trades: SEC EDGAR Form 4Source: SEC.New filings appear shortly after the SEC posts them; they're due two business days after the trade. Latest 2026-02-23.JSON and CSV
Company record: EDGAR filing index for CIK 901243Ticker, name and exchange from the SEC's company list, refreshed weekly.
Rate limits: 10 requests a minute without a key, 30 with a free key from a free account.

How to read it

Read the position against the flow: rising short interest with a high daily short share is new shorting; rising short interest with a normal short share is old shorts holding on.
Insider buys next to a large short position are rare and stand out; insider sells next to one are common and mean little.
Fails to deliver matter relative to the float, not in absolute shares; a million failed shares in a mega cap is noise.

Analysis of what the data shows, not advice. XOOMAR does not recommend buying, selling or holding anything.

Datasets

Frequently Asked Questions

How much of MUA is sold short?

58,845 shares were held short at the 2026-09-15 settlement, 1.0 days of average volume. FINRA publishes the next count about eight business days after the 15th and the last business day of the month.

What is MUA's daily short volume?

On 2026-10-08, 57,777 of the 206,640 MUA shares reported to FINRA were sold short, 28.0% of the day's reported volume. Short volume is a flow for one day, not a position.

Does MUA have fails to deliver?

The SEC's latest file shows 2,799 MUA shares failed to deliver at settlement 2026-09-11. Fails are reported per settlement date and published twice a month with a lag.

Are MUA insiders buying or selling?

No open-market insider trades were reported for MUA in the last 90 days. The most recent filings are listed below. Latest filing: HUBBARD ROBERT GLENN (Director) on 2026-02-23.

Who owns 5% or more of MUA?

Which tracked 13F managers own MUA?

1 of the 30 tracked 13F managers held MUA shares at their latest filing, $178K in all. The largest: Ken Griffin's Citadel Advisors (16K shares, $178K).

Data on this page is provided for informational purposes only and is not financial advice. See our editorial policy.

Blackrock Muniassets Fund (MUA)

Short interest

Daily short volume

Fails to deliver

Insider trades

Large holders (13D and 13G)

13F holders

Blackrock Muniassets Fund in the regulatory record

Source and updates

How to read it

Other company pages

Datasets

Frequently Asked Questions