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.
134K
Short interest
settlement 2026-09-30
1.0
Days to cover
unchanged vs prior
33.5%
Short share of volume
2026-10-23
18,394
Fails to deliver
settlement 2026-09-30
$0
Insider flow, 90 days
0 buys, 0 sells
As of 2026-10-23.
Short interest
FINRA, twice a month. The newest 48 settlements in the table, 48 in the chart. JSONAs of 30 September 2026, short interest in MUA is 134,412 shares, down 692,181 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 572K shares a day that is 1.0 days to cover.
Embed this chart.The embed keeps its attribution line.
<iframe src="https://xoomar.com/embed/stocks/mua" width="100%" height="440" style="border:0;max-width:100%" loading="lazy" title="XOOMAR chart"></iframe>
| Settlement | Shares short | Change | Avg daily volume | Days to cover |
|---|---|---|---|---|
| 2026-09-30 | 134,412 | +128.4% | 571,769 | 1.00 |
| 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 |
| 2025-09-15 | 105,043 | +48.6% | 103,312 | 1.02 |
| 2025-08-29 | 70,695 | -10.5% | 104,653 | 1.00 |
| 2025-08-15 | 78,967 | -28.3% | 104,911 | 1.00 |
| 2025-07-31 | 110,175 | +156.3% | 130,307 | 1.00 |
| 2025-07-15 | 42,982 | -10.3% | 93,816 | 1.00 |
| 2025-06-30 | 47,931 | +208.4% | 112,220 | 1.00 |
| 2025-06-13 | 15,542 | -45.5% | 97,027 | 1.00 |
| 2025-05-30 | 28,504 | -13.7% | 92,806 | 1.00 |
| 2025-05-15 | 33,010 | +68.3% | 80,772 | 1.00 |
| 2025-04-30 | 19,617 | +99.4% | 141,489 | 1.00 |
| 2025-04-15 | 9,836 | -66.0% | 189,393 | 1.00 |
| 2025-03-31 | 28,920 | +12.3% | 121,294 | 1.00 |
| 2025-03-14 | 25,763 | +82.7% | 158,270 | 1.00 |
| 2025-02-28 | 14,104 | -28.9% | 168,885 | 1.00 |
| 2025-02-14 | 19,834 | -19.9% | 117,257 | 1.00 |
| 2025-01-31 | 24,771 | -34.4% | 96,305 | 1.00 |
| 2025-01-15 | 37,752 | -25.9% | 89,336 | 1.00 |
| 2024-12-31 | 50,926 | +29.0% | 159,591 | 1.00 |
| 2024-12-13 | 39,491 | -2.0% | 78,202 | 1.00 |
| 2024-11-29 | 40,302 | -25.3% | 62,458 | 1.00 |
| 2024-11-15 | 53,927 | +51.3% | 97,252 | 1.00 |
| 2024-10-31 | 35,645 | -25.1% | 103,984 | 1.00 |
| 2024-10-15 | 47,603 | -34.4% | 81,120 | 1.00 |
Daily short volume
FINRA Reg SHO, the last 30 sessions. JSONAs of 23 October 2026, the short share of MUA volume is 33.5%, up 9.4 points over the last five sessions. Over the last 30 readings it ranged from 13.4% (9 October 2026) to 60.2% (1 October 2026). The latest reading is 4.8 points below the 30-session average of 38.3%, on 231K shares reported.
| Date | Short volume | Total volume | Short share | Exempt |
|---|---|---|---|---|
| 2026-10-23 | 77K | 231K | 33.5% | 0 |
| 2026-10-22 | 52K | 174K | 29.8% | 0 |
| 2026-10-21 | 100K | 186K | 53.8% | 0 |
| 2026-10-20 | 61K | 198K | 30.7% | 0 |
| 2026-10-19 | 119K | 229K | 52.1% | 18,191 |
| 2026-10-16 | 40K | 166K | 24.1% | 6,969 |
| 2026-10-15 | 65K | 168K | 38.9% | 900 |
| 2026-10-14 | 47K | 199K | 23.6% | 0 |
| 2026-10-13 | 32K | 214K | 14.8% | 175 |
| 2026-10-12 | 29K | 133K | 21.5% | 0 |
| 2026-10-09 | 47K | 354K | 13.4% | 0 |
| 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 |
Fails to deliver
SEC, the last 30 settlement dates with a fail. JSONAs of 30 September 2026, the fails-to-deliver balance in MUA is 18,394 shares, up 13,202 shares over the last settlement date. Over the last 30 readings it ranged from 631 shares (23 September 2026) to 419,932 shares (26 August 2026). The latest reading sits at the bottom of that range.
| Settlement | Shares failed | Price | Value |
|---|---|---|---|
| 2026-09-30 | 18,394 | $9.40 | $173K |
| 2026-09-28 | 5,192 | $9.55 | $50K |
| 2026-09-23 | 631 | $9.69 | $6K |
| 2026-09-22 | 711 | $9.69 | $7K |
| 2026-09-18 | 5,956 | $9.77 | $58K |
| 2026-09-17 | 3,682 | $9.68 | $36K |
| 2026-09-16 | 1,198 | $9.62 | $12K |
| 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 |
Insider trades
SEC Form 4, newest first. JSONNo 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 | Other transaction | 261 | $11.36 | $3K | 261 |
| 2026-02-23 | HUBBARD ROBERT GLENN | Director | Other transaction | 261 | $11.36 | $3K | 261 |
| 2026-02-23 | Romaglino Christian | Director | Other transaction | 1K | $11.36 | $12K | 1K |
| 2026-02-23 | KESTER W CARL | Director | Other transaction | 88 | $11.36 | $1000 | 188 |
| 2026-02-23 | Harris Stayce D. | Director | Other transaction | 9 | $11.36 | $102 | 20 |
| 2026-01-30 | Maloney Kevin | Other | Returned to company | 385 | $11.07 | $4K | 0 |
| 2026-01-30 | Maloney Kevin | Other | Exercise or conversion | 385 | price not stated in the filing | not stated | 385 |
| 2026-01-30 | Soccio Phillip | Other | Returned to company | 711 | $11.07 | $8K | 0 |
| 2026-01-30 | Soccio Phillip | Other | Exercise or conversion | 711 | price not stated in the filing | not stated | 711 |
| 2026-01-30 | OCONNOR WALTER | Other | Returned to company | 1K | $11.07 | $12K | 0 |
| 2026-01-30 | OCONNOR WALTER | Other | Exercise or conversion | 1K | price not stated in the filing | not stated | 1K |
| 2025-01-31 | Maloney Kevin | Other | Returned to company | 36 | $11.05 | $401 | 0 |
| 2025-01-31 | Maloney Kevin | Other | Exercise or conversion | 36 | price not stated in the filing | not stated | 36 |
| 2025-01-31 | OCONNOR WALTER | Other | Returned to company | 309 | $11.05 | $3K | 0 |
| 2025-01-31 | OCONNOR WALTER | Other | Exercise or conversion | 309 | price not stated in the filing | not stated | 309 |
| 2025-01-31 | Soccio Phillip | Other | Exercise or conversion | 238 | price not stated in the filing | not stated | 238 |
| 2025-01-31 | Soccio Phillip | Other | Returned to company | 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 | Other transaction | 2K | price not stated in the filing | not stated | 0 |
| 2024-01-31 | Soccio Phillip | Other | Returned to company | 39 | $10.91 | $424 | 0 |
| 2024-01-31 | Soccio Phillip | Other | Exercise or conversion | 39 | price not stated in the filing | not stated | 39 |
| 2024-01-31 | OCONNOR WALTER | Other | Returned to company | 143 | $10.91 | $2K | 0 |
| 2024-01-31 | OCONNOR WALTER | Other | Exercise or conversion | 143 | price not stated in the filing | not stated | 143 |
| 2024-01-31 | Maloney Kevin | Other | Exercise or conversion | 34 | price not stated in the filing | not stated | 34 |
| 2024-01-31 | Maloney Kevin | Other | Returned to company | 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 |
| 2023-12-27 | BANK OF AMERICA CORP /DE/ | TenPercentOwner | Buy | 27 | $10.56 | $285 | 100 |
| 2023-12-27 | BANK OF AMERICA CORP /DE/ | TenPercentOwner | Buy | 2K | $10.57 | $24K | 5K |
| 2023-12-27 | BANK OF AMERICA CORP /DE/ | TenPercentOwner | Buy | 500 | $10.56 | $5K | 3K |
| 2023-12-27 | BANK OF AMERICA CORP /DE/ | TenPercentOwner | Buy | 300 | $10.56 | $3K | 2K |
| 2023-12-27 | BANK OF AMERICA CORP /DE/ | TenPercentOwner | Buy | 100 | $10.56 | $1K | 400 |
| 2023-12-27 | BANK OF AMERICA CORP /DE/ | TenPercentOwner | Sell | 5K | $10.83 | $58K | 0 |
| 2023-11-20 | BANK OF AMERICA CORP /DE/ | 10% owner | Sell | 100 | $9.97 | $997 | 7K |
| 2023-11-20 | BANK OF AMERICA CORP /DE/ | 10% owner | Sell | 100 | $9.97 | $997 | 7K |
| 2023-11-20 | BANK OF AMERICA CORP /DE/ | 10% owner | Sell | 100 | $9.97 | $997 | 7K |
| 2023-11-20 | BANK OF AMERICA CORP /DE/ | 10% owner | Sell | 100 | $9.94 | $994 | 12K |
| 2023-11-20 | BANK OF AMERICA CORP /DE/ | 10% owner | Sell | 100 | $9.90 | $990 | 18K |
| 2023-11-20 | BANK OF AMERICA CORP /DE/ | 10% owner | Sell | 100 | $9.90 | $990 | 18K |
| 2023-11-20 | BANK OF AMERICA CORP /DE/ | 10% owner | Sell | 100 | $9.90 | $990 | 18K |
| 2023-11-20 | BANK OF AMERICA CORP /DE/ | 10% owner | Sell | 100 | $9.90 | $990 | 18K |
| 2023-11-20 | BANK OF AMERICA CORP /DE/ | 10% owner | Sell | 100 | $9.90 | $990 | 18K |
| 2023-11-20 | BANK OF AMERICA CORP /DE/ | 10% owner | Sell | 100 | $9.89 | $989 | 18K |
| 2023-11-20 | BANK OF AMERICA CORP /DE/ | 10% owner | Sell | 100 | $9.89 | $989 | 18K |
| 2023-11-20 | BANK OF AMERICA CORP /DE/ | 10% owner | Sell | 100 | $9.89 | $989 | 18K |
| 2023-11-20 | BANK OF AMERICA CORP /DE/ | 10% owner | Sell | 77 | $9.89 | $762 | 19K |
| 2023-11-20 | BANK OF AMERICA CORP /DE/ | 10% owner | Sell | 200 | $9.89 | $2K | 19K |
| 2023-11-20 | BANK OF AMERICA CORP /DE/ | 10% owner | Sell | 77 | $9.89 | $762 | 19K |
| 2023-11-20 | BANK OF AMERICA CORP /DE/ | 10% owner | Sell | 23 | $9.89 | $227 | 19K |
| 2023-11-20 | BANK OF AMERICA CORP /DE/ | 10% owner | Sell | 23 | $9.89 | $227 | 19K |
| 2023-11-20 | BANK OF AMERICA CORP /DE/ | 10% owner | Sell | 200 | $9.89 | $2K | 19K |
| 2023-11-20 | BANK OF AMERICA CORP /DE/ | 10% owner | Sell | 100 | $9.89 | $989 | 20K |
| 2023-11-20 | BANK OF AMERICA CORP /DE/ | 10% owner | Sell | 100 | $9.89 | $989 | 20K |
| 2023-11-20 | BANK OF AMERICA CORP /DE/ | 10% owner | Sell | 1K | $9.88 | $10K | 34K |
| 2023-11-20 | BANK OF AMERICA CORP /DE/ | 10% owner | Sell | 500 | $9.88 | $5K | 36K |
| 2023-11-20 | BANK OF AMERICA CORP /DE/ | 10% owner | Sell | 100 | $9.91 | $991 | 38K |
| 2023-11-20 | BANK OF AMERICA CORP /DE/ | 10% owner | Sell | 100 | $9.90 | $990 | 38K |
| 2023-11-20 | BANK OF AMERICA CORP /DE/ | 10% owner | Sell | 100 | $9.90 | $990 | 38K |
| 2023-11-20 | BANK OF AMERICA CORP /DE/ | 10% owner | Sell | 100 | $9.90 | $990 | 38K |
| 2023-11-20 | BANK OF AMERICA CORP /DE/ | 10% owner | Sell | 100 | $9.88 | $988 | 38K |
| 2023-11-20 | BANK OF AMERICA CORP /DE/ | 10% owner | Sell | 100 | $9.88 | $988 | 38K |
| 2023-11-20 | BANK OF AMERICA CORP /DE/ | 10% owner | Sell | 100 | $9.88 | $988 | 38K |
| 2023-11-20 | BANK OF AMERICA CORP /DE/ | 10% owner | Sell | 100 | $9.88 | $988 | 39K |
| 2023-11-20 | BANK OF AMERICA CORP /DE/ | 10% owner | Sell | 200 | $9.88 | $2K | 39K |
| 2023-11-20 | BANK OF AMERICA CORP /DE/ | 10% owner | Sell | 200 | $9.88 | $2K | 39K |
| 2023-11-20 | BANK OF AMERICA CORP /DE/ | 10% owner | Sell | 200 | $9.88 | $2K | 39K |
| 2023-11-20 | BANK OF AMERICA CORP /DE/ | 10% owner | Sell | 1K | $9.91 | $10K | 40K |
| 2023-11-20 | BANK OF AMERICA CORP /DE/ | 10% owner | Sell | 500 | $9.92 | $5K | 41K |
| 2023-11-20 | BANK OF AMERICA CORP /DE/ | 10% owner | Sell | 300 | $9.92 | $3K | 42K |
| 2023-11-20 | BANK OF AMERICA CORP /DE/ | 10% owner | Sell | 100 | $9.95 | $995 | 43K |
| 2023-11-20 | BANK OF AMERICA CORP /DE/ | 10% owner | Sell | 100 | $9.98 | $998 | 44K |
| 2023-11-20 | BANK OF AMERICA CORP /DE/ | 10% owner | Sell | 100 | $9.96 | $996 | 45K |
| 2023-11-20 | BANK OF AMERICA CORP /DE/ | 10% owner | Sell | 100 | $9.95 | $995 | 45K |
| 2023-11-20 | BANK OF AMERICA CORP /DE/ | 10% owner | Sell | 100 | $9.95 | $995 | 45K |
| 2023-11-20 | BANK OF AMERICA CORP /DE/ | 10% owner | Sell | 6 | $9.95 | $60 | 45K |
| 2023-11-20 | BANK OF AMERICA CORP /DE/ | TenPercentOwner | Sell | 5 | $9.95 | $50 | 45K |
| 2023-11-20 | BANK OF AMERICA CORP /DE/ | TenPercentOwner | Buy | 45K | $9.97 | $449K | 45K |
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. JSON2 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. JSON1 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 2026-09-30.JSON and CSV
- Daily short volume
- FINRA Reg SHO daily filesSource: FINRA.Every trading day, the morning after FINRA posts it. Latest 2026-10-23.JSON and CSV
- Fails to deliver
- SEC fails-to-deliver dataSource: SEC.Twice a month, a few weeks after the half month ends. Latest 2026-09-30.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.
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Datasets
Frequently Asked Questions
How much of MUA is sold short?
134,412 shares were held short at the 2026-09-30 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 2026-10-23, 77,192 of the 230,514 MUA shares reported to FINRA were sold short, 33.5% 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 18,394 MUA shares failed to deliver at settlement 2026-09-30. 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?
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.
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.