Prokidney (PROK)
Prokidney on one page: short interest, daily short volume, fails to deliver, planned sales, large holders, 13F holders, earnings dates and insider trades. Listed on Nasdaq, classified by the SEC as biological products, (no diagnostic substances).
24.6M
Short interest
settlement 2026-10-15
20.8
Days to cover
+9.8 days vs prior
67.1%
Short share of volume
2026-11-03
65,483
Fails to deliver
settlement 2026-10-14
Mon 9 Nov
Next earnings
estimated date
-$1.1M
Insider flow, 90 days
0 buys, 6 sells
As of 2026-11-03.
Short interest
FINRA, twice a month. The newest 48 settlements in the table, 48 in the chart. JSONAs of 15 October 2026, short interest in PROK is 24,566,501 shares, up 3,121,135 shares over the last month. Over the last 48 readings it ranged from 7,565,450 shares (31 July 2025) to 24,566,501 shares (15 October 2026). The latest reading sits at the top of that range. At the reported average volume of 1.2M shares a day that is 20.8 days to cover.
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| Settlement | Shares short | Change | Avg daily volume | Days to cover |
|---|---|---|---|---|
| 2026-10-15 | 24,566,501 | +3.3% | 1,182,939 | 20.77 |
| 2026-09-30 | 23,785,320 | +10.9% | 2,167,549 | 10.97 |
| 2026-09-15 | 21,445,366 | +3.4% | 1,126,265 | 19.04 |
| 2026-08-31 | 20,737,263 | -3.5% | 1,172,348 | 17.69 |
| 2026-08-14 | 21,494,435 | +3.8% | 1,147,132 | 18.74 |
| 2026-07-31 | 20,706,315 | -1.0% | 924,016 | 22.41 |
| 2026-07-15 | 20,913,200 | +7.7% | 1,321,416 | 15.83 |
| 2026-06-30 | 19,425,505 | +10.7% | 1,943,294 | 10.00 |
| 2026-06-15 | 17,547,522 | -2.7% | 982,147 | 17.87 |
| 2026-05-29 | 18,032,397 | -6.3% | 977,251 | 18.45 |
| 2026-05-15 | 19,241,878 | +5.4% | 762,948 | 25.22 |
| 2026-04-30 | 18,263,285 | +3.8% | 664,916 | 27.47 |
| 2026-04-15 | 17,600,654 | +5.5% | 1,374,164 | 12.81 |
| 2026-03-31 | 16,683,004 | +8.8% | 918,231 | 18.17 |
| 2026-03-13 | 15,332,082 | -1.5% | 609,305 | 25.16 |
| 2026-02-27 | 15,565,337 | -4.0% | 415,744 | 37.44 |
| 2026-02-13 | 16,205,625 | +3.8% | 1,000,564 | 16.20 |
| 2026-01-30 | 15,610,003 | +2.4% | 1,025,542 | 15.22 |
| 2026-01-15 | 15,251,796 | +0.5% | 1,068,622 | 14.27 |
| 2025-12-31 | 15,182,669 | +9.9% | 1,334,634 | 11.38 |
| 2025-12-15 | 13,812,601 | -6.6% | 1,135,517 | 12.16 |
| 2025-11-28 | 14,786,117 | +5.9% | 1,237,126 | 11.95 |
| 2025-11-14 | 13,964,229 | +13.6% | 1,800,339 | 7.76 |
| 2025-10-31 | 12,294,628 | +14.5% | 1,446,465 | 8.50 |
| 2025-10-15 | 10,736,252 | +0.3% | 2,843,259 | 3.78 |
| 2025-09-30 | 10,707,361 | +5.8% | 1,271,003 | 8.42 |
| 2025-09-15 | 10,116,244 | +20.7% | 3,323,392 | 3.04 |
| 2025-08-29 | 8,384,160 | -3.5% | 1,475,196 | 5.68 |
| 2025-08-15 | 8,691,695 | +14.9% | 2,880,949 | 3.02 |
| 2025-07-31 | 7,565,450 | -33.7% | 4,690,251 | 1.61 |
| 2025-07-15 | 11,412,365 | -18.6% | 70,340,340 | 1.00 |
| 2025-06-30 | 14,027,641 | -16.5% | 2,663,766 | 5.27 |
| 2025-06-13 | 16,799,156 | +1.7% | 484,567 | 34.67 |
| 2025-05-30 | 16,524,499 | +3.6% | 543,573 | 30.40 |
| 2025-05-15 | 15,942,724 | +1.9% | 624,609 | 25.52 |
| 2025-04-30 | 15,640,901 | +17.8% | 1,158,512 | 13.50 |
| 2025-04-15 | 13,281,995 | +11.4% | 1,527,968 | 8.69 |
| 2025-03-31 | 11,927,193 | +0.9% | 344,430 | 34.63 |
| 2025-03-14 | 11,819,141 | -1.0% | 766,957 | 15.41 |
| 2025-02-28 | 11,933,117 | +1.6% | 343,544 | 34.74 |
| 2025-02-14 | 11,748,264 | -1.1% | 394,826 | 29.76 |
| 2025-01-31 | 11,880,649 | +2.2% | 368,253 | 32.26 |
| 2025-01-15 | 11,624,881 | +9.1% | 570,422 | 20.38 |
| 2024-12-31 | 10,652,620 | +3.8% | 525,107 | 20.29 |
| 2024-12-13 | 10,263,432 | -3.4% | 402,541 | 25.50 |
| 2024-11-29 | 10,621,709 | -0.8% | 412,103 | 25.77 |
| 2024-11-15 | 10,701,810 | +3.5% | 562,463 | 19.03 |
| 2024-10-31 | 10,341,164 | -3.7% | 295,358 | 35.01 |
Daily short volume
FINRA Reg SHO, the last 30 sessions. JSONAs of 3 November 2026, the short share of PROK volume is 67.1%, up 0.8 points over the last five sessions. Over the last 30 readings it ranged from 46.3% (25 September 2026) to 94.4% (16 October 2026). The latest reading is 4.5 points below the 30-session average of 71.6%, on 791K shares reported.
| Date | Short volume | Total volume | Short share | Exempt |
|---|---|---|---|---|
| 2026-11-03 | 531K | 791K | 67.1% | 107,632 |
| 2026-11-02 | 3.2M | 4.8M | 67.1% | 464,454 |
| 2026-10-30 | 623K | 854K | 72.9% | 29,568 |
| 2026-10-29 | 284K | 347K | 81.7% | 0 |
| 2026-10-28 | 404K | 670K | 60.3% | 0 |
| 2026-10-27 | 405K | 609K | 66.4% | 0 |
| 2026-10-26 | 243K | 279K | 87.2% | 0 |
| 2026-10-23 | 116K | 145K | 79.9% | 0 |
| 2026-10-22 | 134K | 259K | 51.6% | 4,912 |
| 2026-10-21 | 214K | 261K | 82.0% | 0 |
| 2026-10-20 | 269K | 555K | 48.5% | 5 |
| 2026-10-19 | 260K | 479K | 54.4% | 43,545 |
| 2026-10-16 | 740K | 784K | 94.4% | 16,179 |
| 2026-10-15 | 223K | 298K | 74.9% | 11,188 |
| 2026-10-14 | 482K | 727K | 66.3% | 8 |
| 2026-10-13 | 439K | 617K | 71.2% | 0 |
| 2026-10-12 | 186K | 244K | 76.2% | 137 |
| 2026-10-09 | 320K | 445K | 71.9% | 0 |
| 2026-10-08 | 213K | 326K | 65.5% | 14 |
| 2026-10-07 | 226K | 295K | 76.5% | 349 |
| 2026-10-06 | 272K | 318K | 85.6% | 0 |
| 2026-10-05 | 222K | 302K | 73.7% | 554 |
| 2026-10-02 | 319K | 422K | 75.8% | 0 |
| 2026-10-01 | 389K | 451K | 86.3% | 0 |
| 2026-09-30 | 291K | 366K | 79.6% | 25 |
| 2026-09-29 | 196K | 313K | 62.6% | 0 |
| 2026-09-28 | 651K | 1.0M | 63.7% | 4 |
| 2026-09-25 | 423K | 914K | 46.3% | 292 |
| 2026-09-24 | 480K | 671K | 71.6% | 0 |
| 2026-09-23 | 444K | 505K | 87.9% | 0 |
Fails to deliver
SEC, the last 30 settlement dates with a fail. JSONAs of 14 October 2026, the fails-to-deliver balance in PROK is 65,483 shares, up 61,583 shares over the last settlement date. Over the last 30 readings it ranged from 379 shares (24 August 2026) to 890,270 shares (21 September 2026). The latest reading sits at the bottom of that range.
| Settlement | Shares failed | Price | Value |
|---|---|---|---|
| 2026-10-14 | 65,483 | $1.57 | $103K |
| 2026-10-13 | 3,900 | $1.67 | $7K |
| 2026-10-09 | 12,463 | $1.66 | $21K |
| 2026-10-07 | 11,440 | $1.60 | $18K |
| 2026-10-05 | 6,459 | $1.72 | $11K |
| 2026-10-02 | 19,428 | $1.71 | $33K |
| 2026-10-01 | 9,702 | $1.66 | $16K |
| 2026-09-30 | 21,253 | $1.63 | $35K |
| 2026-09-29 | 2,053 | $1.61 | $3K |
| 2026-09-28 | 36,229 | $1.60 | $58K |
| 2026-09-24 | 57,195 | $1.65 | $94K |
| 2026-09-23 | 34,240 | $1.83 | $63K |
| 2026-09-22 | 506,645 | $1.78 | $902K |
| 2026-09-21 | 890,270 | $1.91 | $1.7M |
| 2026-09-18 | 21,020 | $1.80 | $38K |
| 2026-09-16 | 52,285 | $1.74 | $91K |
| 2026-09-15 | 3,485 | $1.81 | $6K |
| 2026-09-11 | 36,299 | $1.84 | $67K |
| 2026-09-10 | 17,570 | $1.85 | $33K |
| 2026-09-09 | 24,504 | $1.99 | $49K |
| 2026-09-08 | 6,167 | $2.01 | $12K |
| 2026-09-04 | 5,491 | $1.92 | $11K |
| 2026-09-03 | 14,748 | $1.91 | $28K |
| 2026-09-01 | 4,139 | $1.89 | $8K |
| 2026-08-31 | 4,148 | $1.83 | $8K |
| 2026-08-28 | 6,069 | $1.82 | $11K |
| 2026-08-27 | 3,194 | $1.74 | $6K |
| 2026-08-26 | 4,478 | $1.73 | $8K |
| 2026-08-25 | 11,733 | $1.61 | $19K |
| 2026-08-24 | 379 | $1.61 | $610 |
Insider trades
SEC Form 4, newest first. JSONInsiders at PROK reported 6 open-market sells worth $1.1M in the last 90 days and no open-market buys. Latest filing: Weber Darin J. (Chief Regulatory Officer) on 2026-10-28.
| Date | Insider | Title | Type | Shares | Price | Value | Owned after |
|---|---|---|---|---|---|---|---|
| 2026-10-28 | Weber Darin J. | Chief Regulatory Officer | Conversion | 200K | $0.00 | $0 | 200K |
| 2026-08-20 | Pereira Brian JG | Director | Sell | 27K | $1.42 | $38K | 0 |
| 2026-08-20 | Pereira Brian JG | Director | Sell | 223K | $1.42 | $317K | 0 |
| 2026-08-19 | Pereira Brian JG | Director | Sell | 27K | $1.44 | $39K | 27K |
| 2026-08-19 | Pereira Brian JG | Director | Sell | 223K | $1.44 | $321K | 223K |
| 2026-08-18 | Pereira Brian JG | Director | Sell | 28K | $1.37 | $38K | 54K |
| 2026-08-18 | Pereira Brian JG | Director | Sell | 229K | $1.37 | $314K | 446K |
| 2026-08-04 | Pereira Brian JG | Director | Conversion | 675K | $0.00 | $0 | 675K |
| 2026-08-04 | Pereira Brian JG | Director | Conversion | 82K | $0.00 | $0 | 82K |
| 2026-06-12 | Girolamo Todd C | Chief Legal Officer | Conversion | 164K | $0.00 | $0 | 328K |
| 2026-04-28 | Control Empresarial de Capitales S.A. de C.V. | 10% owner, Add'l Rep. Persons-see Ex.99-1 | Conversion | 63.1M | $0.00 | $0 | 73.8M |
| 2025-11-13 | Pereira Brian JG | Director | Sell | 54K | $2.37 | $129K | 0 |
| 2025-11-13 | Pereira Brian JG | Director | Sell | 448K | $2.37 | $1.1M | 0 |
| 2025-11-12 | Pereira Brian JG | Director | Sell | 28K | $2.72 | $75K | 54K |
| 2025-11-12 | Pereira Brian JG | Director | Sell | 227K | $2.72 | $619K | 448K |
| 2025-07-08 | Weber Darin J. | Chief Regulatory Officer | Sell | 103K | $3.02 | $313K | 0 |
| 2025-06-03 | Legorreta Pablo G. | Director,TenPercentOwner | Conversion | 3.8M | $0.00 | $0 | 26.4M |
| 2025-06-03 | Legorreta Pablo G. | Director,TenPercentOwner | Other transaction | 3.8M | $0.00 | $0 | 22.6M |
| 2025-04-22 | Control Empresarial de Capitales S.A. de C.V. | TenPercentOwner,Other | Buy | 387K | $0.71 | $275K | 73.8M |
| 2025-04-17 | Control Empresarial de Capitales S.A. de C.V. | TenPercentOwner,Other | Buy | 25K | $0.75 | $19K | 73.5M |
| 2025-04-16 | Control Empresarial de Capitales S.A. de C.V. | TenPercentOwner,Other | Buy | 100K | $0.75 | $75K | 73.4M |
| 2025-04-15 | Control Empresarial de Capitales S.A. de C.V. | TenPercentOwner,Other | Buy | 468K | $0.70 | $328K | 73.3M |
| 2025-04-14 | Control Empresarial de Capitales S.A. de C.V. | TenPercentOwner,Other | Buy | 268K | $0.73 | $196K | 72.9M |
| 2025-04-11 | Control Empresarial de Capitales S.A. de C.V. | TenPercentOwner,Other | Buy | 2K | $0.61 | $1K | 72.6M |
| 2025-04-10 | Control Empresarial de Capitales S.A. de C.V. | TenPercentOwner,Other | Buy | 1.0M | $0.61 | $630K | 72.6M |
| 2025-02-04 | Pereira Brian JG | Director | Conversion | 675K | $0.00 | $0 | 675K |
| 2025-02-04 | Pereira Brian JG | Director | Conversion | 82K | $0.00 | $0 | 82K |
| 2025-02-04 | Tolerantia, LLC | TenPercentOwner | Other transaction | 533K | $0.00 | $0 | 22.6M |
| 2025-02-04 | Tolerantia, LLC | TenPercentOwner | Conversion | 533K | $0.00 | $0 | 23.2M |
| 2024-09-19 | Weber Darin J. | Chief Regulatory Officer | Sell | 16K | $2.50 | $41K | 103K |
| 2024-07-31 | Girolamo Todd C | Chief Legal Officer | Conversion | 82K | $0.00 | $0 | 164K |
| 2024-07-26 | Weber Darin J. | Chief Regulatory Officer | Sell | 826 | $2.50 | $2K | 120K |
| 2024-06-18 | Weber Darin J. | Chief Regulatory Officer | Sell | 17K | $2.82 | $49K | 121K |
| 2024-06-13 | Legorreta Pablo G. | Director,TenPercentOwner | Buy | 22.6M | $2.42 | $54.7M | 22.6M |
| 2024-06-11 | Control Empresarial de Capitales S.A. de C.V. | TenPercentOwner,Other | Buy | 8.3M | $2.42 | $20.0M | 71.6M |
| 2024-05-20 | Weber Darin J. | Chief Regulatory Officer | Sell | 17K | $4.08 | $70K | 138K |
| 2024-04-22 | Weber Darin J. | SVP of Regulatory Development | Sell | 16K | $2.51 | $41K | 155K |
| 2024-04-18 | Weber Darin J. | SVP of Regulatory Development | Sell | 800 | $2.54 | $2K | 172K |
| 2024-04-16 | Weber Darin J. | SVP of Regulatory Development | Sell | 17K | $2.50 | $43K | 172K |
| 2024-04-12 | Weber Darin J. | SVP of Regulatory Development | Sell | 84K | $1.73 | $145K | 190K |
| 2024-04-01 | Weber Darin J. | SVP of Regulatory Development | Sell | 300 | $1.69 | $507 | 274K |
| 2024-03-25 | Control Empresarial de Capitales S.A. de C.V. | TenPercentOwner,Other | Buy | 30K | $1.43 | $43K | 63.3M |
| 2024-03-22 | Control Empresarial de Capitales S.A. de C.V. | TenPercentOwner,Other | Buy | 14K | $1.40 | $20K | 63.3M |
| 2024-03-20 | Control Empresarial de Capitales S.A. de C.V. | TenPercentOwner,Other | Buy | 33K | $1.40 | $46K | 63.3M |
| 2024-03-14 | Control Empresarial de Capitales S.A. de C.V. | TenPercentOwner,Other | Buy | 50K | $1.36 | $68K | 63.2M |
| 2024-03-13 | Control Empresarial de Capitales S.A. de C.V. | TenPercentOwner,Other | Buy | 50K | $1.50 | $75K | 63.2M |
| 2024-02-05 | Legorreta Pablo G. | Director,TenPercentOwner | Conversion | 749K | $0.00 | $0 | 749K |
| 2024-02-05 | Legorreta Pablo G. | Director,TenPercentOwner | Other transaction | 749K | $0.00 | $0 | 0 |
| 2024-02-05 | Weber Darin J. | SVP of Regulatory Development | Conversion | 137K | $0.00 | $0 | 274K |
| 2024-02-05 | Girolamo Todd C | Chief Legal Officer | Conversion | 82K | $0.00 | $0 | 82K |
| 2023-11-19 | SC Master Holdings, LLC | Other | Sell | 2.1M | $1.31 | $2.7M | 0 |
| 2023-11-19 | SC Master Holdings, LLC | Other | Sell | 5.2M | $1.31 | $6.8M | 0 |
| 2023-11-17 | Palihapitiya Chamath | TenPercentOwner | Sell | 258K | $1.19 | $307K | 5.2M |
| 2023-11-16 | Palihapitiya Chamath | TenPercentOwner | Sell | 212K | $1.22 | $259K | 5.4M |
| 2023-11-15 | Palihapitiya Chamath | TenPercentOwner | Sell | 282K | $1.49 | $421K | 5.7M |
| 2023-11-14 | Palihapitiya Chamath | TenPercentOwner | Sell | 306K | $1.50 | $459K | 5.9M |
| 2023-11-13 | Palihapitiya Chamath | TenPercentOwner | Sell | 89K | $1.57 | $139K | 6.2M |
| 2023-11-10 | Palihapitiya Chamath | TenPercentOwner | Sell | 86K | $1.61 | $138K | 6.3M |
| 2023-11-09 | Palihapitiya Chamath | TenPercentOwner | Sell | 96K | $1.68 | $161K | 6.4M |
| 2023-11-08 | SC Master Holdings, LLC | TenPercentOwner | Sell | 59K | $1.66 | $98K | 6.5M |
| 2023-11-07 | SC Master Holdings, LLC | TenPercentOwner | Sell | 71K | $1.59 | $113K | 6.6M |
| 2023-11-06 | SC Master Holdings, LLC | TenPercentOwner | Sell | 80K | $1.56 | $124K | 6.6M |
| 2023-11-03 | Palihapitiya Chamath | TenPercentOwner | Sell | 148K | $1.73 | $257K | 6.7M |
| 2023-11-02 | Palihapitiya Chamath | TenPercentOwner | Sell | 134K | $1.73 | $231K | 6.9M |
| 2023-11-01 | Palihapitiya Chamath | TenPercentOwner | Sell | 123K | $1.62 | $200K | 7.0M |
| 2023-10-31 | SC PIPE Holdings LLC | TenPercentOwner | Sell | 142K | $1.69 | $240K | 7.1M |
| 2023-10-30 | SC PIPE Holdings LLC | TenPercentOwner | Sell | 157K | $1.65 | $259K | 7.3M |
| 2023-10-30 | Legorreta Pablo G. | Director,TenPercentOwner | Other transaction | 5.3M | $0.00 | $0 | 0 |
| 2023-10-30 | Legorreta Pablo G. | Director,TenPercentOwner | Conversion | 5.3M | $0.00 | $0 | 5.3M |
| 2023-10-27 | SC PIPE Holdings LLC | TenPercentOwner | Sell | 93K | $1.59 | $147K | 7.4M |
| 2023-10-26 | Palihapitiya Chamath | TenPercentOwner | Sell | 78K | $1.80 | $140K | 7.5M |
| 2023-10-25 | Palihapitiya Chamath | TenPercentOwner | Sell | 67K | $1.76 | $118K | 7.6M |
| 2023-10-24 | Palihapitiya Chamath | TenPercentOwner | Sell | 176K | $1.75 | $309K | 7.7M |
| 2023-10-23 | SC Master Holdings, LLC | TenPercentOwner | Sell | 160K | $1.83 | $293K | 7.8M |
| 2023-10-20 | SC Master Holdings, LLC | TenPercentOwner | Sell | 87K | $1.92 | $167K | 8.0M |
| 2023-10-19 | SC Master Holdings, LLC | TenPercentOwner | Sell | 200K | $2.19 | $438K | 8.1M |
| 2023-10-18 | SC Master Holdings, LLC | TenPercentOwner | Sell | 125K | $2.28 | $285K | 8.3M |
| 2023-10-17 | SC Master Holdings, LLC | TenPercentOwner | Sell | 106K | $2.83 | $301K | 8.4M |
| 2023-10-16 | SC Master Holdings, LLC | TenPercentOwner | Sell | 216K | $2.87 | $619K | 8.5M |
| 2023-10-13 | SC Master Holdings, LLC | TenPercentOwner | Sell | 250K | $2.67 | $668K | 8.7M |
| 2023-10-12 | SC Master Holdings, LLC | TenPercentOwner | Sell | 19K | $3.14 | $59K | 9.1M |
| 2023-10-12 | SC Master Holdings, LLC | TenPercentOwner | Sell | 143K | $2.63 | $376K | 9.0M |
| 2023-10-11 | SC Master Holdings, LLC | TenPercentOwner | Sell | 75K | $3.84 | $288K | 9.1M |
| 2023-10-10 | SC PIPE Holdings LLC | TenPercentOwner | Sell | 75K | $4.34 | $326K | 9.2M |
| 2023-10-09 | SC PIPE Holdings LLC | TenPercentOwner | Sell | 75K | $4.20 | $315K | 9.3M |
| 2023-10-06 | SC PIPE Holdings LLC | TenPercentOwner | Sell | 75K | $4.48 | $336K | 9.4M |
| 2023-10-05 | SC PIPE Holdings LLC | TenPercentOwner | Sell | 53K | $4.76 | $250K | 9.4M |
| 2023-09-19 | Palihapitiya Chamath | TenPercentOwner | Sell | 1.7M | $5.47 | $9.3M | 2.1M |
| 2023-08-25 | Weber Darin J. | SVP of Regulatory Development | Conversion | 137K | $0.00 | $0 | 137K |
| 2023-03-31 | Cowen Aaron | TenPercentOwner | Other transaction | 3.1M | $0.00 | $0 | 3.2M |
| 2023-03-31 | Cowen Aaron | TenPercentOwner | Other transaction | 858K | $0.00 | $0 | 4.1M |
| 2022-09-06 | Cowen Aaron | TenPercentOwner | Buy | 7K | $6.99 | $49K | 6.3M |
| 2022-08-31 | Cowen Aaron | TenPercentOwner | Buy | 2K | $8.94 | $19K | 6.3M |
| 2022-08-31 | Cowen Aaron | TenPercentOwner | Buy | 1K | $8.93 | $9K | 6.3M |
| 2022-08-30 | Cowen Aaron | TenPercentOwner | Buy | 706 | $7.49 | $5K | 6.3M |
| 2022-07-11 | SCS Sponsor III LLC | Other | Exercise or conversion | 6.2M | $0.00 | $0 | 6.9M |
| 2022-07-11 | SCS Sponsor III LLC | Other | Other transaction | 6.9M | $0.00 | $0 | 0 |
| 2022-07-11 | Palihapitiya Chamath | TenPercentOwner | Other transaction | 3.1M | $0.00 | $0 | 12.8M |
| 2022-07-11 | Palihapitiya Chamath | TenPercentOwner | Exercise or conversion | 6.2M | $0.00 | $0 | 15.9M |
| 2022-07-11 | Palihapitiya Chamath | TenPercentOwner | Grant | 9.0M | $10.00 | $90.0M | 9.6M |
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 PROK worth $2.0M at the prices reported; 0 in the last 90 days worth $0. Latest: Brian Pereira filed on 2025-11-12 to sell 675,234 shares ($1.8M) from 2025-11-12.
| Filed | Seller | Shares | Market value | Of outstanding | Sale from | Broker |
|---|---|---|---|---|---|---|
| 2025-11-12 | Brian PereiraDirector | 675K | $1.8M | 0.477% | 2025-11-12 | Merrill Lynch Pierce Fenner and Smith |
| 2025-11-12 | Brian PereiraDirector | 82K | $221K | 0.058% | 2025-11-12 | Merrill Lynch Pierce Fenner and Smith |
Large holders (13D and 13G)
One row per reporting person with its latest filing, newest first. JSON8 holders report 5% or more of PROK in their latest filing, all on Schedule 13D (active intent). The largest reported stake is Carlos Slim Helu at 36.0% of the class (73,842,723 shares), filed 2026-04-30 for an event on 2026-04-28.
| Filed | Form | Holder | Shares | Of class | Event |
|---|---|---|---|---|---|
| 2026-08-12 | 13G/Ano. 1 | Morgan Stanleyparent holding company, corporation | 9.7M | 4.7% | 2026-06-30 |
| 2026-08-12 | 13G/Ano. 1 | Morgan Stanley Investment Management Inc.investment adviser, corporation | 9.6M | 4.7% | 2026-06-30 |
| 2026-04-30 | 13D/Ano. 2 | Carlos Slim Heluindividual | 73.8M | 36.0% | 2026-04-28 |
| 2026-04-30 | 13D/Ano. 2 | Carlos Slim Domitindividual | 73.8M | 36.0% | 2026-04-28 |
| 2026-04-30 | 13D/Ano. 2 | Marco Antonio Slim Domitindividual | 73.8M | 36.0% | 2026-04-28 |
| 2026-04-30 | 13D/Ano. 2 | Patrick Slim Domitindividual | 73.8M | 36.0% | 2026-04-28 |
| 2026-04-30 | 13D/Ano. 2 | Maria Soumaya Slim Domitindividual | 73.8M | 36.0% | 2026-04-28 |
| 2026-04-30 | 13D/Ano. 2 | Vanessa Paola Slim Domitindividual | 73.8M | 36.0% | 2026-04-28 |
| 2026-04-30 | 13D/Ano. 2 | Johanna Monique Slim Domitindividual | 73.8M | 36.0% | 2026-04-28 |
| 2026-04-30 | 13D/Ano. 2 | Control Empresarial de Capitales S.A. de C.V.corporation, parent holding company | 73.8M | 36.0% | 2026-04-28 |
13F holders
Tracked managers holding PROK at their latest 13F. JSON3 of the 30 tracked managers held PROK at their latest 13F, $5.0M in total at quarter-end prices. Renaissance Technologies is the largest at $2.2M (0.0% of its portfolio) as of 2026-06-30. Over the prior quarter 0 added shares and 3 cut.
| Fund | Quarter | Shares | Value | Of portfolio | Change in shares |
|---|---|---|---|---|---|
| Renaissance Technologies | 2026-06-30 | 1.1M | $2.2M | 0.00% | -151K |
| Millennium Management | 2026-06-30 | 1.1M | $2.2M | 0.00% | -1.2M |
| Two Sigma Investments | 2026-06-30 | 273K | $557K | 0.00% | -73K |
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
Prokidney 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 Prokidney (PROK), SEC CIK 1850270, listed on Nasdaq, classified by the SEC as biological products, (no diagnostic substances). 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 2026-10-15.JSON and CSV
- Daily short volume
- FINRA Reg SHO daily filesSource: FINRA.Every trading day, the morning after FINRA posts it. Latest 2026-11-03.JSON and CSV
- Fails to deliver
- SEC fails-to-deliver dataSource: SEC.Twice a month, a few weeks after the half month ends. Latest 2026-10-14.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 2025-11-12.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 2026-08-12.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 2026-08-10.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 2026-10-28.JSON and CSV
- Company record
- EDGAR filing index for CIK 1850270Ticker, 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 biological products, (no diagnostic substances)
Other company pages
Datasets
Frequently Asked Questions
How much of PROK is sold short?
24,566,501 shares were held short at the 2026-10-15 settlement, 20.8 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 PROK's daily short volume?
On 2026-11-03, 531,418 of the 791,486 PROK shares reported to FINRA were sold short, 67.1% of the day's reported volume. Short volume is a flow for one day, not a position.
Does PROK have fails to deliver?
The SEC's latest file shows 65,483 PROK shares failed to deliver at settlement 2026-10-14. Fails are reported per settlement date and published twice a month with a lag.
Are PROK insiders buying or selling?
Insiders at PROK reported 6 open-market sells worth $1.1M in the last 90 days and no open-market buys. Latest filing: Weber Darin J. (Chief Regulatory Officer) on 2026-10-28.
Have PROK insiders filed to sell?
2 Form 144 notices on file for PROK worth $2.0M at the prices reported; 0 in the last 90 days worth $0. Latest: Brian Pereira filed on 2025-11-12 to sell 675,234 shares ($1.8M) from 2025-11-12.
Who owns 5% or more of PROK?
8 holders report 5% or more of PROK in their latest filing, all on Schedule 13D (active intent). The largest reported stake is Carlos Slim Helu at 36.0% of the class (73,842,723 shares), filed 2026-04-30 for an event on 2026-04-28.
Which tracked 13F managers own PROK?
3 of the 30 tracked 13F managers held PROK shares at their latest filing, $5.0M in all. The largest: Renaissance Technologies (1.1M shares, $2.2M), Izzy Englander's Millennium Management (1.1M shares, $2.2M), Two Sigma Investments (273K shares, $557K).
Data on this page is provided for informational purposes only and is not financial advice. See our editorial policy.