Castellum (CTM)
Castellum on one page: short interest, daily short volume, fails to deliver, planned sales, earnings dates and insider trades. Listed on NYSE, classified by the SEC as services-management consulting services.
5.4M
Short interest
settlement 2026-09-30
13.1
Days to cover
+4.7 days vs prior
55.7%
Short share of volume
2026-10-23
1
Fails to deliver
settlement 2026-09-29
Fri 6 Nov
Next earnings
estimated date
4 people
Insiders buying, 30 days
$3K combined, latest 2026-10-01
$34K
Insider flow, 90 days
6 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 CTM is 5,423,015 shares, down 1,652,620 shares over the last month. Over the last 48 readings it ranged from 101,066 shares (31 October 2024) to 7,075,635 shares (31 August 2026). At the reported average volume of 413K shares a day that is 13.1 days to cover.
Embed this chart.The embed keeps its attribution line.
<iframe src="https://xoomar.com/embed/stocks/ctm" 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 | 5,423,015 | -0.0% | 412,728 | 13.14 |
| 2026-09-15 | 5,425,022 | -23.3% | 646,184 | 8.40 |
| 2026-08-31 | 7,075,635 | +23.7% | 657,482 | 10.76 |
| 2026-08-14 | 5,720,306 | -4.0% | 1,608,743 | 3.56 |
| 2026-07-31 | 5,956,892 | +2.0% | 1,230,222 | 4.84 |
| 2026-07-15 | 5,840,420 | -7.6% | 949,892 | 6.15 |
| 2026-06-30 | 6,320,226 | +63.8% | 4,593,686 | 1.38 |
| 2026-06-15 | 3,858,606 | -2.9% | 15,375,957 | 1.00 |
| 2026-05-29 | 3,973,051 | -22.6% | 1,448,755 | 2.74 |
| 2026-05-15 | 5,136,284 | +22.6% | 2,900,659 | 1.77 |
| 2026-04-30 | 4,187,834 | -4.9% | 639,634 | 6.55 |
| 2026-04-15 | 4,403,986 | -8.3% | 855,285 | 5.15 |
| 2026-03-31 | 4,800,688 | +4.4% | 1,658,343 | 2.89 |
| 2026-03-13 | 4,596,457 | +19.6% | 715,251 | 6.43 |
| 2026-02-27 | 3,844,921 | +1.4% | 909,191 | 4.23 |
| 2026-02-13 | 3,791,646 | +4.8% | 1,152,068 | 3.29 |
| 2026-01-30 | 3,617,871 | +44.5% | 1,479,973 | 2.44 |
| 2026-01-15 | 2,504,221 | +3.3% | 1,903,830 | 1.32 |
| 2025-12-31 | 2,423,431 | +4.8% | 2,325,046 | 1.04 |
| 2025-12-15 | 2,311,915 | -46.3% | 1,702,666 | 1.36 |
| 2025-11-28 | 4,301,349 | +34.2% | 1,528,438 | 2.81 |
| 2025-11-14 | 3,205,097 | -8.7% | 5,316,689 | 1.00 |
| 2025-10-31 | 3,508,498 | +13.5% | 9,687,957 | 1.00 |
| 2025-10-15 | 3,090,684 | -1.1% | 2,605,636 | 1.19 |
| 2025-09-30 | 3,125,885 | +83.2% | 2,415,573 | 1.29 |
| 2025-09-15 | 1,706,033 | +1.4% | 2,360,045 | 1.00 |
| 2025-08-29 | 1,682,098 | +9.2% | 2,120,096 | 1.00 |
| 2025-08-15 | 1,540,327 | +2.5% | 2,640,153 | 1.00 |
| 2025-07-31 | 1,502,293 | -32.7% | 3,432,711 | 1.00 |
| 2025-07-15 | 2,232,035 | +317.8% | 3,016,477 | 1.00 |
| 2025-06-30 | 534,201 | -23.6% | 1,676,616 | 1.00 |
| 2025-06-13 | 699,494 | +8.0% | 2,881,345 | 1.00 |
| 2025-05-30 | 647,512 | -55.6% | 1,469,309 | 1.00 |
| 2025-05-15 | 1,459,143 | -1.3% | 1,174,197 | 1.24 |
| 2025-04-30 | 1,477,762 | -28.8% | 737,967 | 2.00 |
| 2025-04-15 | 2,076,266 | -20.9% | 1,344,248 | 1.54 |
| 2025-03-31 | 2,626,429 | -7.5% | 4,825,600 | 1.00 |
| 2025-03-14 | 2,839,407 | +54.1% | 8,291,804 | 1.00 |
| 2025-02-28 | 1,842,501 | -5.5% | 4,233,694 | 1.00 |
| 2025-02-14 | 1,950,040 | +200.6% | 6,901,762 | 1.00 |
| 2025-01-31 | 648,703 | -31.7% | 3,343,225 | 1.00 |
| 2025-01-15 | 949,175 | -69.4% | 11,666,141 | 1.00 |
| 2024-12-31 | 3,098,036 | +378.0% | 24,795,645 | 1.00 |
| 2024-12-13 | 648,130 | +217.3% | 4,065,204 | 1.00 |
| 2024-11-29 | 204,292 | -38.5% | 578,544 | 1.00 |
| 2024-11-15 | 332,245 | +228.7% | 7,843,828 | 1.00 |
| 2024-10-31 | 101,066 | -44.3% | 141,765 | 1.00 |
| 2024-10-15 | 181,524 | -11.1% | 63,906 | 2.84 |
Daily short volume
FINRA Reg SHO, the last 30 sessions. JSONAs of 23 October 2026, the short share of CTM volume is 55.7%, up 0.5 points over the last five sessions. Over the last 30 readings it ranged from 29.3% (17 September 2026) to 72.3% (25 September 2026). The latest reading is in line with the 30-session average of 55.2%, on 321K shares reported.
| Date | Short volume | Total volume | Short share | Exempt |
|---|---|---|---|---|
| 2026-10-23 | 179K | 321K | 55.7% | 37,250 |
| 2026-10-22 | 136K | 229K | 59.4% | 17 |
| 2026-10-21 | 79K | 197K | 40.3% | 1,300 |
| 2026-10-20 | 54K | 108K | 50.2% | 700 |
| 2026-10-19 | 93K | 175K | 53.3% | 5,400 |
| 2026-10-16 | 83K | 150K | 55.2% | 0 |
| 2026-10-15 | 90K | 204K | 44.1% | 0 |
| 2026-10-14 | 320K | 473K | 67.7% | 5,033 |
| 2026-10-13 | 165K | 249K | 66.3% | 5,000 |
| 2026-10-12 | 247K | 355K | 69.5% | 0 |
| 2026-10-09 | 88K | 183K | 47.9% | 55 |
| 2026-10-08 | 119K | 256K | 46.6% | 0 |
| 2026-10-07 | 78K | 160K | 48.6% | 0 |
| 2026-10-06 | 122K | 355K | 34.5% | 0 |
| 2026-10-05 | 98K | 138K | 70.6% | 0 |
| 2026-10-02 | 96K | 159K | 60.4% | 0 |
| 2026-10-01 | 100K | 171K | 58.6% | 0 |
| 2026-09-30 | 50K | 128K | 38.7% | 0 |
| 2026-09-29 | 68K | 173K | 39.5% | 0 |
| 2026-09-28 | 230K | 334K | 68.7% | 292 |
| 2026-09-25 | 117K | 162K | 72.3% | 0 |
| 2026-09-24 | 89K | 130K | 68.6% | 4,150 |
| 2026-09-23 | 89K | 208K | 42.6% | 0 |
| 2026-09-22 | 333K | 551K | 60.4% | 30,900 |
| 2026-09-21 | 157K | 316K | 49.8% | 1,000 |
| 2026-09-18 | 121K | 211K | 57.4% | 300 |
| 2026-09-17 | 68K | 231K | 29.3% | 0 |
| 2026-09-16 | 234K | 333K | 70.3% | 0 |
| 2026-09-15 | 170K | 262K | 65.0% | 0 |
| 2026-09-14 | 155K | 238K | 64.9% | 3,900 |
Fails to deliver
SEC, the last 30 settlement dates with a fail. JSONAs of 29 September 2026, the fails-to-deliver balance in CTM is 1 share, unchanged over the last settlement date. Over the last 30 readings it ranged from 1 share (13 July 2026) to 90,739 shares (2 September 2026). The latest reading sits at the bottom of that range.
| Settlement | Shares failed | Price | Value |
|---|---|---|---|
| 2026-09-29 | 1 | $0.61 | $1 |
| 2026-09-23 | 1 | $0.64 | $1 |
| 2026-09-21 | 22,287 | $0.61 | $14K |
| 2026-09-17 | 52,755 | $0.61 | $32K |
| 2026-09-11 | 11 | $0.62 | $7 |
| 2026-09-10 | 63,187 | $0.60 | $38K |
| 2026-09-08 | 2,321 | $0.62 | $1K |
| 2026-09-03 | 1,531 | $0.57 | $873 |
| 2026-09-02 | 90,739 | $0.57 | $52K |
| 2026-08-31 | 2,712 | $0.61 | $2K |
| 2026-08-28 | 5 | $0.61 | $3 |
| 2026-08-27 | 1,411 | $0.61 | $861 |
| 2026-08-26 | 22,415 | $0.61 | $14K |
| 2026-08-24 | 18 | $0.61 | $11 |
| 2026-08-20 | 2,465 | $0.62 | $2K |
| 2026-08-19 | 2 | $0.62 | $1 |
| 2026-08-17 | 16 | $0.65 | $10 |
| 2026-08-11 | 11,055 | $0.61 | $7K |
| 2026-08-07 | 189 | $0.80 | $151 |
| 2026-08-05 | 3,379 | $0.79 | $3K |
| 2026-08-03 | 2,264 | $0.72 | $2K |
| 2026-07-31 | 2,252 | $0.71 | $2K |
| 2026-07-30 | 2,258 | $0.66 | $1K |
| 2026-07-29 | 4,900 | $0.71 | $3K |
| 2026-07-24 | 69 | $0.70 | $48 |
| 2026-07-20 | 20,483 | $0.62 | $13K |
| 2026-07-17 | 19,640 | $0.62 | $12K |
| 2026-07-16 | 78,698 | $0.63 | $50K |
| 2026-07-15 | 16 | $0.64 | $10 |
| 2026-07-13 | 1 | $0.66 | $1 |
Insider trades
SEC Form 4, newest first. JSONInsiders at CTM reported 6 open-market buys worth $34K in the last 90 days and no open-market sells. Latest filing: MARTIN TAMMY L (General Counsel and Secretary) on 2026-10-01.
| Date | Insider | Title | Type | Shares | Price | Value | Owned after |
|---|---|---|---|---|---|---|---|
| 2026-10-01 | MARTIN TAMMY L | General Counsel and Secretary | Buy | 1K | $0.54 | $747 | 16K |
| 2026-10-01 | Merriman Andrew | Chief Operating Officer | Buy | 1K | $0.54 | $747 | 590K |
| 2026-10-01 | Ives Glen R | President | Buy | 2K | $0.54 | $910 | 203K |
| 2026-10-01 | Bell David T | Chief Financial Officer | Buy | 1K | $0.54 | $747 | 19K |
| 2026-09-09 | Merriman Andrew | Chief Operating Officer | Buy | 10K | $0.62 | $6K | 589K |
| 2026-09-09 | Merriman Andrew | Chief Operating Officer | Buy | 40K | $0.62 | $25K | 579K |
| 2026-07-01 | Merriman Andrew | Chief Operating Officer | Buy | 1K | $0.61 | $736 | 539K |
| 2026-07-01 | MARTIN TAMMY L | General Counsel and Secretary | Buy | 1K | $0.61 | $736 | 15K |
| 2026-07-01 | Ives Glen R | President | Buy | 1K | $0.61 | $772 | 201K |
| 2026-07-01 | Bell David T | Chief Financial Officer | Buy | 1K | $0.61 | $736 | 17K |
| 2026-03-31 | Merriman Andrew | Chief Operating Officer | Grant | 1K | $0.45 | $604 | 537K |
| 2026-03-31 | MARTIN TAMMY L | General Counsel and Secretary | Grant | 1K | $0.45 | $604 | 14K |
| 2026-03-31 | Bell David T | Chief Financial Officer | Grant | 1K | $0.45 | $604 | 16K |
| 2026-03-27 | Merriman Andrew | Chief Operating Officer | Buy | 2K | $0.64 | $1K | 536K |
| 2026-03-27 | Ives Glen R | President | Buy | 2K | $0.62 | $1K | 200K |
| 2026-03-26 | Ives Glen R | President | Buy | 10K | $0.66 | $7K | 198K |
| 2026-03-25 | McMillen Charles Thomas | Director | Sell | 30K | $0.70 | $21K | 231K |
| 2026-03-18 | Merriman Andrew | Chief Operating Officer | Buy | 3K | $0.80 | $2K | 534K |
| 2026-03-18 | McMillen Charles Thomas | Director | Sell | 55K | $0.80 | $44K | 261K |
| 2025-12-19 | WRIGHT JAY O | General Counsel, Secretary | Sell | 30K | $1.05 | $32K | 7.1M |
| 2025-12-16 | WRIGHT JAY O | General Counsel, Secretary | Sell | 12K | $1.07 | $13K | 7.2M |
| 2025-12-15 | WRIGHT JAY O | General Counsel, Secretary | Sell | 6K | $1.10 | $7K | 7.2M |
| 2025-12-12 | WRIGHT JAY O | General Counsel, Secretary | Sell | 11K | $1.16 | $13K | 7.2M |
| 2025-12-11 | WRIGHT JAY O | General Counsel, Secretary | Sell | 50K | $1.16 | $58K | 7.2M |
| 2025-12-10 | WRIGHT JAY O | General Counsel, Secretary | Sell | 127K | $1.21 | $153K | 7.2M |
| 2025-12-01 | WRIGHT JAY O | General Counsel, Secretary | Sell | 35K | $1.05 | $37K | 7.4M |
| 2025-11-28 | WRIGHT JAY O | General Counsel, Secretary | Sell | 18K | $1.05 | $19K | 7.4M |
| 2025-11-17 | WRIGHT JAY O | General Counsel, Secretary | Sell | 10K | $1.16 | $12K | 7.4M |
| 2025-11-14 | WRIGHT JAY O | General Counsel, Secretary | Sell | 90K | $1.15 | $104K | 7.4M |
| 2025-11-13 | WRIGHT JAY O | General Counsel, Secretary | Sell | 160K | $1.17 | $186K | 7.5M |
| 2025-11-11 | WRIGHT JAY O | General Counsel, Secretary | Sell | 60K | $1.18 | $71K | 7.7M |
| 2025-09-16 | WRIGHT JAY O | General Counsel, Secretary | Sell | 50K | $1.11 | $56K | 7.7M |
| 2025-09-15 | WRIGHT JAY O | General Counsel, Secretary | Sell | 50K | $1.10 | $55K | 7.8M |
| 2025-09-12 | WRIGHT JAY O | General Counsel, Secretary | Sell | 73K | $1.12 | $82K | 7.8M |
| 2025-09-11 | WRIGHT JAY O | General Counsel, Secretary | Sell | 90K | $1.12 | $101K | 7.9M |
| 2025-09-10 | WRIGHT JAY O | General Counsel, Secretary | Sell | 70K | $1.12 | $78K | 8.0M |
| 2025-09-09 | WRIGHT JAY O | General Counsel, Secretary | Sell | 150K | $1.12 | $168K | 8.1M |
| 2025-09-08 | WRIGHT JAY O | General Counsel, Secretary | Sell | 250K | $1.12 | $280K | 8.2M |
| 2025-09-05 | WRIGHT JAY O | General Counsel, Secretary | Sell | 46K | $1.08 | $50K | 8.5M |
| 2025-09-03 | Fuller Mark C | Former Officer and Affiliate | Sell | 500K | $1.12 | $560K | 6.1M |
| 2025-08-28 | WRIGHT JAY O | General Counsel, Secretary | Sell | 24K | $1.05 | $25K | 8.5M |
| 2025-08-27 | WRIGHT JAY O | General Counsel, Secretary | Sell | 40K | $1.04 | $42K | 8.5M |
| 2025-08-26 | WRIGHT JAY O | General Counsel, Secretary | Sell | 40K | $1.04 | $42K | 8.6M |
| 2025-08-22 | WRIGHT JAY O | General Counsel, Secretary | Sell | 45K | $1.04 | $47K | 8.6M |
| 2025-08-21 | McMillen Charles Thomas | Director | Exercise or conversion | 125K | $0.21 | $27K | 316K |
| 2025-08-19 | WRIGHT JAY O | General Counsel, Secretary | Sell | 126K | $1.05 | $132K | 8.7M |
| 2025-08-18 | WRIGHT JAY O | General Counsel, Secretary | Sell | 225K | $1.08 | $243K | 8.8M |
| 2025-05-19 | Fuller Mark C | Director,TenPercentOwner | Sell | 500K | $1.05 | $525K | 6.6M |
| 2025-05-19 | WRIGHT JAY O | General Counsel, Secretary | Other transaction | 241K | $1.04 | $250K | 9.3M |
| 2025-05-19 | WRIGHT JAY O | General Counsel, Secretary | Sell | 259K | $1.07 | $278K | 9.0M |
| 2025-03-06 | Fuller Mark C | Director,TenPercentOwner | Sell | 225K | $1.33 | $299K | 7.1M |
| 2025-03-06 | WRIGHT JAY O | General Counsel, Secretary | Sell | 135K | $1.34 | $181K | 9.5M |
| 2025-03-05 | Fuller Mark C | Director,TenPercentOwner | Other transaction | 50K | price not stated in the filing | not stated | 7.6M |
| 2025-03-05 | Fuller Mark C | Director,TenPercentOwner | Sell | 275K | $1.49 | $410K | 7.3M |
| 2025-03-05 | WRIGHT JAY O | General Counsel, Secretary | Sell | 365K | $1.47 | $537K | 9.7M |
| 2025-01-02 | McMillen Charles Thomas | Director | Exercise or conversion | 100K | $0.21 | $21K | 191K |
| 2024-09-04 | WRIGHT JAY O | General Counsel, Secretary | Buy | 272K | $0.16 | $44K | 10.1M |
| 2024-09-03 | WRIGHT JAY O | General Counsel, Secretary | Buy | 44K | $0.17 | $8K | 9.9M |
| 2024-08-29 | WRIGHT JAY O | General Counsel, Secretary | Buy | 62K | $0.16 | $10K | 9.8M |
| 2024-08-28 | WRIGHT JAY O | General Counsel, Secretary | Buy | 98K | $0.16 | $16K | 9.7M |
| 2024-08-14 | WRIGHT JAY O | General Counsel, Secretary | Buy | 115K | $0.14 | $16K | 9.7M |
| 2024-06-21 | WRIGHT JAY O | General Counsel, Secretary | Buy | 44K | $0.18 | $8K | 9.5M |
| 2024-06-20 | WRIGHT JAY O | General Counsel, Secretary | Buy | 81K | $0.18 | $15K | 9.5M |
| 2023-06-13 | Fuller Mark C | CEO, President | Buy | 1K | $0.65 | $650 | 7.7M |
| 2023-03-31 | WRIGHT JAY O | See Remarks | Buy | 18K | $1.08 | $20K | 9.4M |
| 2023-03-29 | WRIGHT JAY O | See Remarks | Buy | 6K | $1.13 | $6K | 9.4M |
| 2023-03-28 | WRIGHT JAY O | See Remarks | Buy | 8K | $1.13 | $9K | 9.4M |
| 2023-03-24 | WRIGHT JAY O | See Remarks | Buy | 5K | $1.10 | $5K | 9.4M |
| 2023-03-22 | WRIGHT JAY O | See Remarks | Buy | 9K | $1.07 | $10K | 9.4M |
| 2023-03-21 | Alarie Mark S | Director | Buy | 50K | $1.19 | $60K | 113K |
| 2023-03-21 | Alarie Mark S | Director | Buy | 13K | $1.20 | $15K | 63K |
| 2023-03-21 | Campbell John Francis | Director | Buy | 50K | $1.19 | $60K | 127K |
| 2023-03-21 | Campbell John Francis | Director | Buy | 13K | $1.20 | $15K | 76K |
| 2023-03-21 | McMillen Charles Thomas | Director | Buy | 50K | $1.19 | $60K | 81K |
| 2023-03-21 | McMillen Charles Thomas | Director | Buy | 13K | $1.20 | $15K | 31K |
| 2023-03-21 | Frost Patricia | Director | Buy | 50K | $1.19 | $60K | 63K |
| 2023-03-21 | Frost Patricia | Director | Buy | 13K | $1.20 | $15K | 13K |
| 2023-03-21 | Champoux Bernard S | Director,Other | Buy | 50K | $1.19 | $60K | 105K |
| 2023-03-21 | Champoux Bernard S | Director,Other | Buy | 13K | $1.20 | $15K | 54K |
| 2023-03-17 | WRIGHT JAY O | See remarks | Buy | 16K | $1.04 | $17K | 9.4M |
| 2023-03-15 | WRIGHT JAY O | See Remarks | Buy | 18K | $1.05 | $19K | 9.3M |
| 2023-03-14 | WRIGHT JAY O | See Remarks | Buy | 3K | $1.08 | $3K | 9.3M |
| 2023-03-10 | WRIGHT JAY O | See Remarks | Buy | 11K | $1.04 | $11K | 9.3M |
| 2023-03-03 | WRIGHT JAY O | See Remarks | Buy | 30K | $1.00 | $30K | 9.3M |
| 2023-02-10 | WRIGHT JAY O | See Remarks | Buy | 75K | $15000.00 | n/a | 9.3M |
| 2022-12-20 | Kaunitz Emil | Director | Buy | 6K | $5353.00 | $29.9M | 2.0M |
| 2022-12-06 | WRIGHT JAY O | See Remarks | Buy | 75K | $15000.00 | n/a | 9.2M |
| 2022-12-05 | Champoux Bernard S | DirectorOther | Buy | 900 | $954.00 | $859K | 42K |
| 2022-12-05 | Campbell John Francis | Director | Buy | 8K | $1.22 | $10K | 64K |
| 2022-12-02 | Kaunitz Emil | Director | Sell | 10K | $0.95 | $10K | 2.0M |
| 2022-12-02 | Kaunitz Emil | Director | Buy | 10K | $0.95 | $10K | 2.0M |
| 2022-12-02 | McMillen Charles Thomas | Director | Buy | 11K | $0.96 | $10K | 18K |
| 2022-12-02 | Champoux Bernard S | DirectorOther | Buy | 100 | $94.50 | $9K | 41K |
| 2022-12-02 | WRIGHT JAY O | See Remarks | Buy | 5K | $4335.00 | $19.9M | 9.1M |
| 2022-12-02 | Fuller Mark C | Chief Executive Officer | Buy | 1K | $1246.00 | $1.6M | 7.7M |
| 2022-12-01 | Kaunitz Emil | Director | Sell | 200 | $174.00 | $35K | 2.0M |
| 2022-12-01 | Kaunitz Emil | Director | Buy | 200 | $174.00 | $35K | 2.0M |
| 2022-12-01 | WRIGHT JAY O | See Remarks | Buy | 6K | $5248.00 | $29.9M | 9.1M |
| 2022-11-30 | Fuller Mark C | Chief Executive Officer | Sell | 10K | $0.84 | $8K | 7.7M |
| 2022-11-30 | WRIGHT JAY O | See Remarks | Sell | 8K | $0.85 | $7K | 9.1M |
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.
Planned sales (Form 144)
Newest first. JSON2 Form 144 notices on file for CTM worth $1.0M at the prices reported; 0 in the last 90 days worth $0. Latest: McMillen Charles Thomas filed on 2026-03-17 to sell 110,028 shares ($83) from 2026-03-17.
| Filed | Seller | Shares | Market value | Of outstanding | Sale from | Broker |
|---|---|---|---|---|---|---|
| 2026-03-17 | McMillen Charles ThomasDirector | 110K | $83 | 0.116% | 2026-03-17 | First Georgetown Securities, Inc |
| 2025-11-10 | WRIGHT JAY ODirector, 10% Stockholder | 800K | $1.0M | 0.846% | 2025-11-11 | First Georgetown Securities Inc |
What this page is
Castellum 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 Castellum (CTM), SEC CIK 1877939, listed on NYSE, classified by the SEC as services-management consulting services. 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 2026-09-29.JSON and CSV
- Planned sales
- SEC EDGAR Form 144Source: SEC.New notices appear shortly after the SEC posts them; a notice is filed on or before the sale. Latest 2026-03-17.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 2026-08-07.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 2026-10-01.JSON and CSV
- Company record
- EDGAR filing index for CIK 1877939Ticker, name and exchange from the SEC's company list, refreshed weekly.
- Rate limits
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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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Frequently Asked Questions
How much of CTM is sold short?
5,423,015 shares were held short at the 2026-09-30 settlement, 13.1 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 CTM's daily short volume?
On 2026-10-23, 178,923 of the 321,002 CTM shares reported to FINRA were sold short, 55.7% of the day's reported volume. Short volume is a flow for one day, not a position.
Does CTM have fails to deliver?
The SEC's latest file shows 1 CTM shares failed to deliver at settlement 2026-09-29. Fails are reported per settlement date and published twice a month with a lag.
Are CTM insiders buying or selling?
Insiders at CTM reported 6 open-market buys worth $34K in the last 90 days and no open-market sells. Latest filing: MARTIN TAMMY L (General Counsel and Secretary) on 2026-10-01.
Have CTM insiders filed to sell?
2 Form 144 notices on file for CTM worth $1.0M at the prices reported; 0 in the last 90 days worth $0. Latest: McMillen Charles Thomas filed on 2026-03-17 to sell 110,028 shares ($83) from 2026-03-17.
Data on this page is provided for informational purposes only and is not financial advice. See our editorial policy.