Mbia (MBI)
Mbia on one page: short interest, daily short volume, fails to deliver, large holders, 13F holders, earnings dates and insider trades. Listed on NYSE, classified by the SEC as surety insurance.
2.9M
Short interest
settlement 2026-09-30
6.3
Days to cover
-0.8 days vs prior
45.8%
Short share of volume
2026-10-23
890
Fails to deliver
settlement 2026-09-30
Tue 3 Nov
Next earnings
estimated date
$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 MBI is 2,915,363 shares, up 120,299 shares over the last month. Over the last 48 readings it ranged from 1,447,929 shares (31 December 2025) to 2,970,765 shares (14 August 2026). The latest reading sits at the top of that range. At the reported average volume of 461K shares a day that is 6.3 days to cover.
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| Settlement | Shares short | Change | Avg daily volume | Days to cover |
|---|---|---|---|---|
| 2026-09-30 | 2,915,363 | +2.6% | 460,828 | 6.33 |
| 2026-09-15 | 2,841,227 | +1.6% | 398,761 | 7.13 |
| 2026-08-31 | 2,795,064 | -5.9% | 602,039 | 4.64 |
| 2026-08-14 | 2,970,765 | +13.0% | 514,410 | 5.78 |
| 2026-07-31 | 2,628,598 | +7.3% | 469,751 | 5.60 |
| 2026-07-15 | 2,450,273 | +3.9% | 286,797 | 8.54 |
| 2026-06-30 | 2,358,623 | +0.1% | 384,048 | 6.14 |
| 2026-06-15 | 2,357,548 | +12.9% | 321,162 | 7.34 |
| 2026-05-29 | 2,088,821 | +2.0% | 284,168 | 7.35 |
| 2026-05-15 | 2,047,023 | +4.3% | 509,691 | 4.02 |
| 2026-04-30 | 1,963,122 | +2.5% | 221,749 | 8.85 |
| 2026-04-15 | 1,914,449 | -2.3% | 197,486 | 9.69 |
| 2026-03-31 | 1,959,059 | +4.4% | 369,568 | 5.30 |
| 2026-03-13 | 1,875,704 | +0.1% | 404,413 | 4.64 |
| 2026-02-27 | 1,873,872 | +3.2% | 369,588 | 5.07 |
| 2026-02-13 | 1,815,507 | +2.9% | 369,156 | 4.92 |
| 2026-01-30 | 1,764,869 | +6.0% | 345,354 | 5.11 |
| 2026-01-15 | 1,664,620 | +15.0% | 521,532 | 3.19 |
| 2025-12-31 | 1,447,929 | -9.2% | 318,640 | 4.54 |
| 2025-12-15 | 1,593,963 | -5.5% | 325,725 | 4.89 |
| 2025-11-28 | 1,685,882 | -11.8% | 259,173 | 6.50 |
| 2025-11-14 | 1,912,181 | -3.7% | 380,520 | 5.03 |
| 2025-10-31 | 1,986,029 | +2.5% | 237,612 | 8.36 |
| 2025-10-15 | 1,937,509 | -4.7% | 263,175 | 7.36 |
| 2025-09-30 | 2,033,886 | -3.3% | 455,673 | 4.46 |
| 2025-09-15 | 2,102,514 | -9.5% | 288,896 | 7.28 |
| 2025-08-29 | 2,323,363 | +5.7% | 629,957 | 3.69 |
| 2025-08-15 | 2,197,519 | +9.7% | 629,670 | 3.49 |
| 2025-07-31 | 2,003,717 | -4.4% | 237,176 | 8.45 |
| 2025-07-15 | 2,095,320 | -1.2% | 169,697 | 12.35 |
| 2025-06-30 | 2,121,110 | -2.0% | 205,575 | 10.32 |
| 2025-06-13 | 2,164,751 | +0.9% | 194,698 | 11.12 |
| 2025-05-30 | 2,144,294 | +6.5% | 224,727 | 9.54 |
| 2025-05-15 | 2,013,919 | +5.9% | 310,147 | 6.49 |
| 2025-04-30 | 1,902,339 | -0.2% | 262,104 | 7.26 |
| 2025-04-15 | 1,906,021 | +1.8% | 476,624 | 4.00 |
| 2025-03-31 | 1,873,327 | +3.8% | 236,289 | 7.93 |
| 2025-03-14 | 1,805,435 | +7.7% | 485,187 | 3.72 |
| 2025-02-28 | 1,677,155 | -2.3% | 438,719 | 3.82 |
| 2025-02-14 | 1,716,796 | +0.0% | 347,554 | 4.94 |
| 2025-01-31 | 1,716,448 | +6.9% | 432,811 | 3.97 |
| 2025-01-15 | 1,605,406 | -2.9% | 490,271 | 3.27 |
| 2024-12-31 | 1,653,638 | -6.0% | 338,741 | 4.88 |
| 2024-12-13 | 1,759,088 | +3.0% | 349,494 | 5.03 |
| 2024-11-29 | 1,707,453 | -19.1% | 1,146,444 | 1.49 |
| 2024-11-15 | 2,111,294 | +4.8% | 751,876 | 2.81 |
| 2024-10-31 | 2,015,193 | -0.6% | 205,740 | 9.79 |
| 2024-10-15 | 2,026,750 | +7.9% | 264,465 | 7.66 |
Daily short volume
FINRA Reg SHO, the last 30 sessions. JSONAs of 23 October 2026, the short share of MBI volume is 45.8%, down 6.8 points over the last five sessions. Over the last 30 readings it ranged from 29.0% (13 October 2026) to 87.0% (25 September 2026). The latest reading is 11.3 points below the 30-session average of 57.1%, on 148K shares reported.
| Date | Short volume | Total volume | Short share | Exempt |
|---|---|---|---|---|
| 2026-10-23 | 68K | 148K | 45.8% | 152 |
| 2026-10-22 | 38K | 84K | 45.1% | 0 |
| 2026-10-21 | 30K | 57K | 52.8% | 0 |
| 2026-10-20 | 43K | 81K | 52.4% | 0 |
| 2026-10-19 | 45K | 75K | 60.2% | 0 |
| 2026-10-16 | 27K | 52K | 52.6% | 0 |
| 2026-10-15 | 58K | 108K | 54.2% | 477 |
| 2026-10-14 | 41K | 100K | 40.7% | 404 |
| 2026-10-13 | 44K | 150K | 29.0% | 0 |
| 2026-10-12 | 40K | 68K | 59.4% | 0 |
| 2026-10-09 | 45K | 58K | 78.9% | 19 |
| 2026-10-08 | 31K | 81K | 38.7% | 0 |
| 2026-10-07 | 55K | 80K | 68.6% | 1,485 |
| 2026-10-06 | 83K | 140K | 59.6% | 1 |
| 2026-10-05 | 49K | 77K | 63.4% | 0 |
| 2026-10-02 | 77K | 94K | 81.5% | 0 |
| 2026-10-01 | 113K | 149K | 75.4% | 0 |
| 2026-09-30 | 39K | 74K | 52.8% | 0 |
| 2026-09-29 | 86K | 138K | 62.0% | 0 |
| 2026-09-28 | 55K | 99K | 55.2% | 1,356 |
| 2026-09-25 | 99K | 114K | 87.0% | 63 |
| 2026-09-24 | 91K | 150K | 60.8% | 5 |
| 2026-09-23 | 107K | 200K | 53.5% | 0 |
| 2026-09-22 | 54K | 89K | 60.5% | 0 |
| 2026-09-21 | 65K | 151K | 43.4% | 0 |
| 2026-09-18 | 55K | 85K | 65.0% | 0 |
| 2026-09-17 | 61K | 102K | 59.8% | 0 |
| 2026-09-16 | 84K | 130K | 64.2% | 10 |
| 2026-09-15 | 87K | 202K | 43.1% | 11 |
| 2026-09-14 | 57K | 121K | 47.0% | 0 |
Fails to deliver
SEC, the last 30 settlement dates with a fail. JSONAs of 30 September 2026, the fails-to-deliver balance in MBI is 890 shares, down 10,712 shares over the last settlement date. Over the last 30 readings it ranged from 2 shares (29 June 2026) to 17,430 shares (12 May 2026). The latest reading sits at the bottom of that range.
| Settlement | Shares failed | Price | Value |
|---|---|---|---|
| 2026-09-30 | 890 | $4.29 | $4K |
| 2026-09-21 | 11,602 | $4.39 | $51K |
| 2026-09-17 | 1,841 | $4.54 | $8K |
| 2026-09-14 | 228 | $4.64 | $1K |
| 2026-09-11 | 11 | $4.61 | $51 |
| 2026-09-09 | 1,359 | $4.61 | $6K |
| 2026-08-31 | 4,218 | $4.79 | $20K |
| 2026-08-28 | 4,016 | $4.80 | $19K |
| 2026-08-19 | 1,082 | $4.97 | $5K |
| 2026-08-13 | 1,500 | $4.98 | $7K |
| 2026-08-12 | 101 | $4.96 | $501 |
| 2026-07-28 | 375 | $5.53 | $2K |
| 2026-07-27 | 265 | $5.66 | $1K |
| 2026-07-22 | 16 | $6.30 | $101 |
| 2026-07-16 | 69 | $6.25 | $431 |
| 2026-06-30 | 8,400 | $6.62 | $56K |
| 2026-06-29 | 2 | $6.51 | $13 |
| 2026-06-26 | 62 | $6.14 | $381 |
| 2026-06-17 | 700 | $6.31 | $4K |
| 2026-06-08 | 1,100 | $6.13 | $7K |
| 2026-06-04 | 336 | $5.69 | $2K |
| 2026-06-02 | 1,068 | $5.69 | $6K |
| 2026-05-26 | 400 | $6.12 | $2K |
| 2026-05-22 | 2,907 | $6.30 | $18K |
| 2026-05-21 | 64 | $5.98 | $383 |
| 2026-05-18 | 404 | $5.86 | $2K |
| 2026-05-13 | 11,925 | $6.18 | $74K |
| 2026-05-12 | 17,430 | $6.10 | $106K |
| 2026-05-11 | 9,049 | $5.71 | $52K |
| 2026-05-08 | 919 | $6.39 | $6K |
Insider trades
SEC Form 4, newest first. JSONNo open-market insider trades were reported for MBI in the last 90 days. The most recent filings are listed below. Latest filing: VAUGHAN RICHARD C (Director) on 2026-05-12.
| Date | Insider | Title | Type | Shares | Price | Value | Owned after |
|---|---|---|---|---|---|---|---|
| 2026-05-12 | VAUGHAN RICHARD C | Director | Grant | 16K | $6.18 | $100K | 103K |
| 2026-05-12 | Shasta Theodore | Director | Grant | 16K | $6.18 | $100K | 66K |
| 2026-05-12 | Innis-Thompson Janice L. | Director | Grant | 16K | $6.18 | $100K | 83K |
| 2026-05-12 | GILBERT STEVEN J | Director | Grant | 16K | $6.18 | $100K | 125K |
| 2026-05-12 | DEWBREY DIANE L | Director | Grant | 16K | $6.18 | $100K | 121K |
| 2026-03-04 | Schachinger Joseph R. | EVP, CFO and Treasurer | Tax withholding | 2K | $6.88 | $17K | 248K |
| 2026-03-04 | Young Christopher H. | Assistant Vice President | Tax withholding | 9K | $6.88 | $60K | 652K |
| 2026-03-04 | Fallon William C | CEO & President | Tax withholding | 40K | $6.88 | $273K | 2.8M |
| 2026-03-04 | Bergonzi Adam T. | Assistant Vice President | Tax withholding | 13K | $6.88 | $91K | 943K |
| 2026-03-04 | Avitabile Daniel M. | Assistant Vice President | Tax withholding | 9K | $6.88 | $60K | 651K |
| 2026-03-03 | Fallon William C | CEO and President | Grant | 242K | $6.50 | $1.6M | 2.9M |
| 2026-03-03 | Schachinger Joseph R. | EVP, CFO and Treasurer | Tax withholding | 3K | $6.50 | $18K | 250K |
| 2026-03-03 | Schachinger Joseph R. | EVP, CFO and Treasurer | Grant | 50K | $6.50 | $325K | 253K |
| 2026-03-03 | Young Christopher H. | Assistant Vice President | Tax withholding | 6K | $6.50 | $39K | 660K |
| 2026-03-03 | Young Christopher H. | Assistant Vice President | Grant | 81K | $6.50 | $525K | 666K |
| 2026-03-03 | Fallon William C | CEO and President | Tax withholding | 28K | $6.50 | $180K | 2.9M |
| 2026-03-03 | Fallon William C | CEO and President | Grant | 242K | $6.50 | $1.6M | 2.9M |
| 2026-03-03 | Bergonzi Adam T. | Assistant Vice President | Tax withholding | 9K | $6.50 | $59K | 957K |
| 2026-03-03 | Bergonzi Adam T. | Assistant Vice President | Grant | 115K | $6.50 | $750K | 966K |
| 2026-03-03 | Avitabile Daniel M. | Assistant Vice President | Tax withholding | 6K | $6.50 | $39K | 659K |
| 2026-03-03 | Avitabile Daniel M. | Assistant Vice President | Grant | 81K | $6.50 | $525K | 665K |
| 2025-12-31 | Young Christopher H. | Assistant Vice President | Grant | 4K | $7.16 | $32K | 586K |
| 2025-12-31 | Fallon William C | CEO & President | Grant | 14K | $7.16 | $102K | 2.7M |
| 2025-12-31 | Bergonzi Adam T. | Assistant Vice President | Grant | 7K | $7.16 | $48K | 850K |
| 2025-12-31 | Avitabile Daniel M. | Assistant Vice President | Grant | 4K | $7.16 | $32K | 584K |
| 2025-08-27 | Shasta Theodore | Director | Sell | 6K | $7.90 | $50K | 50K |
| 2025-08-21 | DEWBREY DIANE L | Director | Sell | 5K | $7.15 | $36K | 105K |
| 2025-08-19 | Shasta Theodore | Director | Sell | 8K | $6.71 | $56K | 57K |
| 2025-08-12 | Shasta Theodore | Director | Sell | 20K | $6.15 | $123K | 65K |
| 2025-08-11 | VAUGHAN RICHARD C | Director | Sell | 25K | $6.07 | $152K | 87K |
| 2025-05-13 | DEWBREY DIANE L | Director | Grant | 23K | $4.33 | $100K | 110K |
| 2025-05-13 | Innis-Thompson Janice L. | Director | Grant | 23K | $4.33 | $100K | 67K |
| 2025-05-13 | GILBERT STEVEN J | Director | Grant | 23K | $4.33 | $100K | 109K |
| 2025-05-13 | VAUGHAN RICHARD C | Director | Grant | 23K | $4.33 | $100K | 112K |
| 2025-05-13 | Shasta Theodore | Director | Grant | 23K | $4.33 | $100K | 85K |
| 2025-03-04 | Fallon William C | CEO and President | Grant | 287K | $5.49 | $1.6M | 2.6M |
| 2025-03-04 | Fallon William C | CEO and President | Tax withholding | 40K | $5.49 | $218K | 2.4M |
| 2025-03-04 | Schachinger Joseph R. | Chief Financial Officer | Grant | 46K | $5.49 | $250K | 203K |
| 2025-03-04 | Schachinger Joseph R. | Chief Financial Officer | Tax withholding | 2K | $5.49 | $13K | 158K |
| 2025-03-04 | Avitabile Daniel M. | Assistant Vice President | Grant | 96K | $5.49 | $525K | 580K |
| 2025-03-04 | Avitabile Daniel M. | Assistant Vice President | Tax withholding | 12K | $5.49 | $67K | 484K |
| 2025-03-04 | Bergonzi Adam T. | Assistant Vice President | Tax withholding | 17K | $5.49 | $93K | 707K |
| 2025-03-04 | Bergonzi Adam T. | Assistant Vice President | Grant | 137K | $5.49 | $750K | 843K |
| 2025-03-04 | Young Christopher H. | Assistant Vice President | Tax withholding | 12K | $5.49 | $67K | 485K |
| 2025-03-04 | Young Christopher H. | Assistant Vice President | Grant | 96K | $5.49 | $525K | 581K |
| 2025-03-03 | Avitabile Daniel M. | Assistant Vice President | Tax withholding | 165K | $5.53 | $913K | 497K |
| 2025-03-03 | Young Christopher H. | Assistant Vice President | Tax withholding | 164K | $5.53 | $909K | 498K |
| 2025-03-03 | Bergonzi Adam T. | Assistant Vice President | Tax withholding | 260K | $5.53 | $1.4M | 724K |
| 2025-03-03 | Schachinger Joseph R. | Chief Financial Officer | Tax withholding | 7K | $5.53 | $37K | 160K |
| 2025-03-03 | Fallon William C | CEO and President | Tax withholding | 556K | $5.53 | $3.1M | 2.4M |
| 2025-01-02 | Shasta Theodore | Director | Sell | 10K | $6.74 | $65K | 62K |
| 2024-12-30 | Shasta Theodore | Director | Sell | 11K | $6.13 | $69K | 71K |
| 2024-11-20 | VAUGHAN RICHARD C | Director | Sell | 4K | $6.45 | $25K | 62K |
| 2024-11-19 | VAUGHAN RICHARD C | Director | Sell | 9K | $6.59 | $59K | 66K |
| 2024-06-13 | Shasta Theodore | Director | Sell | 21K | $5.52 | $118K | 83K |
| 2024-05-14 | Shasta Theodore | Director | Grant | 17K | $6.06 | $100K | 104K |
| 2024-05-14 | Innis-Thompson Janice L. | Director | Grant | 17K | $6.06 | $100K | 44K |
| 2024-05-14 | GILBERT STEVEN J | Director | Grant | 17K | $6.06 | $100K | 86K |
| 2024-05-14 | DEWBREY DIANE L | Director | Grant | 17K | $6.06 | $100K | 87K |
| 2024-05-14 | VAUGHAN RICHARD C | Director | Grant | 17K | $6.06 | $100K | 102K |
| 2024-03-05 | Fallon William C | CEO & President | Tax withholding | 32K | $6.58 | $208K | 3.0M |
| 2024-03-05 | McKiernan Anthony | EVP & Chief Financial Officer | Tax withholding | 15K | $6.58 | $99K | 1.3M |
| 2024-03-05 | Schachinger Joseph R. | Controller | Tax withholding | 4K | $6.58 | $26K | 167K |
| 2024-03-05 | Avitabile Daniel M. | Assistant Vice President | Tax withholding | 7K | $6.58 | $45K | 685K |
| 2024-03-05 | Bergonzi Adam T. | Assistant Vice President | Tax withholding | 14K | $6.58 | $89K | 1.0M |
| 2024-03-05 | Young Christopher H. | Assistant Vice President | Tax withholding | 7K | $6.58 | $45K | 686K |
| 2024-03-04 | Fallon William C | CEO & President | Tax withholding | 40K | $6.47 | $257K | 2.8M |
| 2024-03-04 | McKiernan Anthony | EVP & Chief Financial Officer | Tax withholding | 18K | $6.47 | $114K | 1.3M |
| 2024-03-04 | Schachinger Joseph R. | Controller | Tax withholding | 2K | $6.47 | $16K | 148K |
| 2024-03-04 | Avitabile Daniel M. | Assistant Vice President | Tax withholding | 9K | $6.47 | $56K | 617K |
| 2024-03-04 | Young Christopher H. | Assistant Vice President | Tax withholding | 9K | $6.47 | $56K | 617K |
| 2024-03-04 | Bergonzi Adam T. | Assistant Vice President | Tax withholding | 17K | $6.47 | $110K | 914K |
| 2024-03-04 | Fallon William C | CEO & President | Grant | 243K | $6.47 | $1.6M | 3.1M |
| 2024-03-04 | Schachinger Joseph R. | Controller | Grant | 23K | $6.47 | $150K | 171K |
| 2024-03-04 | Avitabile Daniel M. | Assistant Vice President | Grant | 75K | $6.47 | $488K | 692K |
| 2024-03-04 | Bergonzi Adam T. | Assistant Vice President | Grant | 116K | $6.47 | $750K | 1.0M |
| 2024-03-04 | Young Christopher H. | Assistant Vice President | Grant | 75K | $6.47 | $488K | 693K |
| 2024-03-03 | Fallon William C | CEO & President | Tax withholding | 39K | $6.71 | $260K | 2.8M |
| 2024-03-03 | McKiernan Anthony | EVP & Chief Financial Officer | Tax withholding | 13K | $6.71 | $88K | 1.4M |
| 2024-03-03 | Schachinger Joseph R. | Controller | Tax withholding | 5K | $6.71 | $36K | 150K |
| 2024-03-03 | Avitabile Daniel M. | Assistant Vice President | Tax withholding | 8K | $6.71 | $57K | 626K |
| 2024-03-03 | Bergonzi Adam T. | Assistant Vice President | Tax withholding | 13K | $6.71 | $85K | 931K |
| 2024-03-03 | Young Christopher H. | Assistant Vice President | Tax withholding | 8K | $6.71 | $57K | 626K |
| 2024-02-20 | McKiernan Anthony | EVP & Chief Financial Officer | Grant | 12K | $6.77 | $80K | 1.4M |
| 2024-02-20 | Young Christopher H. | Assistant Vice President | Grant | 8K | $6.77 | $52K | 634K |
| 2024-02-20 | Avitabile Daniel M. | Assistant Vice President | Grant | 8K | $6.77 | $52K | 634K |
| 2024-02-20 | Fallon William C | CEO & President | Grant | 25K | $6.77 | $169K | 2.9M |
| 2024-02-20 | Bergonzi Adam T. | Assistant Vice President | Grant | 11K | $6.77 | $72K | 944K |
| 2023-12-29 | Avitabile Daniel M. | Assistant Vice President | Grant | 7K | $6.12 | $40K | 626K |
| 2023-12-29 | Bergonzi Adam T. | Assistant Vice President | Grant | 9K | $6.12 | $55K | 932K |
| 2023-12-29 | Young Christopher H. | Assistant Vice President | Grant | 7K | $6.12 | $40K | 627K |
| 2023-12-29 | McKiernan Anthony | EVP & Chief Financial Officer | Grant | 10K | $6.12 | $61K | 1.4M |
| 2023-12-29 | Fallon William C | CEO & President | Grant | 21K | $6.12 | $129K | 2.9M |
| 2023-12-28 | VAUGHAN RICHARD C | Director | Sell | 3K | $6.08 | $18K | 85K |
| 2023-12-27 | VAUGHAN RICHARD C | Director | Sell | 12K | $6.31 | $76K | 88K |
| 2023-12-26 | Avitabile Daniel M. | Assistant Vice President | Grant | 2K | $7.16 | $15K | 620K |
| 2023-12-26 | Bergonzi Adam T. | Assistant Vice President | Grant | 17K | $7.16 | $124K | 923K |
| 2023-12-26 | Schachinger Joseph R. | Controller | Grant | 3K | $7.16 | $19K | 155K |
| 2023-12-26 | Young Christopher H. | Assistant Vice President | Grant | 1K | $7.16 | $10K | 620K |
| 2023-12-26 | McKiernan Anthony | EVP & Chief Financial Officer | Grant | 84K | $7.16 | $604K | 1.3M |
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 MBI in their latest filing, all on Schedule 13G (passive). The largest reported stake is KAHN BROTHERS GROUP INC at 8.3% of the class (4,213,920 shares), filed 2026-08-14 for an event on 2026-08-14.
| Filed | Form | Holder | Shares | Of class | Event |
|---|---|---|---|---|---|
| 2026-08-14 | 13G | KAHN BROTHERS GROUP INCinvestment adviser | 4.2M | 8.3% | 2026-08-14 |
| 2026-08-13 | 13G/Ano. 2 | Wolf Hill Capital Management, LPinvestment adviser | 2.1M | 4.2% | 2026-06-30 |
| 2026-08-13 | 13G/Ano. 2 | Gary Lehrmanindividual, parent holding company | 2.1M | 4.2% | 2026-06-30 |
| 2026-08-13 | 13G/Ano. 2 | Wolf Hill General Partner, LLCparent holding company, other entity | 2.0M | 3.9% | 2026-06-30 |
| 2026-07-23 | 13G | Leeam S. Lowinindividual | 3.3M | 6.5% | 2026-02-27 |
| 2026-03-27 | 13G/Ano. 1 | The Vanguard Groupinvestment adviser | 0 | 0.0% | 2026-03-13 |
13F holders
Tracked managers holding MBI at their latest 13F. JSON5 of the 30 tracked managers held MBI at their latest 13F, $3.5M in total at quarter-end prices. Renaissance Technologies is the largest at $2.0M (0.0% of its portfolio) as of 2026-06-30. Over the prior quarter 2 added shares and 3 cut.
| Fund | Quarter | Shares | Value | Of portfolio | Change in shares |
|---|---|---|---|---|---|
| Renaissance Technologies | 2026-06-30 | 311K | $2.0M | 0.00% | -99K |
| AQR Capital Management | 2026-06-30 | 141K | $919K | 0.00% | +115K |
| Citadel Advisors | 2026-06-30 | 41K | $267K | 0.00% | -135K |
| Two Sigma Investments | 2026-06-30 | 32K | $207K | 0.00% | +15K |
| D. E. Shaw & Co. | 2026-06-30 | 11K | $73K | 0.00% | -31K |
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
Mbia 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 Mbia (MBI), SEC CIK 814585, listed on NYSE, classified by the SEC as surety insurance. 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 2026-08-14.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
- Earnings dates
- SEC EDGAR 8-K filings (Item 2.02)Source: SEC.Twice a day. Reported dates come from the company's 8-K filings; the next date is marked as an estimate until the 8-K arrives. Latest 2026-08-06.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 2026-05-12.JSON and CSV
- Company record
- EDGAR filing index for CIK 814585Ticker, 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.
Other companies the SEC classifies as surety insurance
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Datasets
Frequently Asked Questions
How much of MBI is sold short?
2,915,363 shares were held short at the 2026-09-30 settlement, 6.3 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 MBI's daily short volume?
On 2026-10-23, 67,689 of the 147,794 MBI shares reported to FINRA were sold short, 45.8% of the day's reported volume. Short volume is a flow for one day, not a position.
Does MBI have fails to deliver?
The SEC's latest file shows 890 MBI shares failed to deliver at settlement 2026-09-30. Fails are reported per settlement date and published twice a month with a lag.
Are MBI insiders buying or selling?
No open-market insider trades were reported for MBI in the last 90 days. The most recent filings are listed below. Latest filing: VAUGHAN RICHARD C (Director) on 2026-05-12.
Who owns 5% or more of MBI?
2 holders report 5% or more of MBI in their latest filing, all on Schedule 13G (passive). The largest reported stake is KAHN BROTHERS GROUP INC at 8.3% of the class (4,213,920 shares), filed 2026-08-14 for an event on 2026-08-14.
Which tracked 13F managers own MBI?
5 of the 30 tracked 13F managers held MBI shares at their latest filing, $3.5M in all. The largest: Renaissance Technologies (311K shares, $2.0M), Cliff Asness's AQR Capital Management (141K shares, $919K), Ken Griffin's Citadel Advisors (41K shares, $267K), Two Sigma Investments (32K shares, $207K), D. E. Shaw & Co. (11K shares, $73K).
Data on this page is provided for informational purposes only and is not financial advice. See our editorial policy.