ProKidney Corp. (PROK) shareholders
PROKNasdaqBiological Products, (No Diagnostic Substances)Fiscal year ends December 31
$1.04−0.10 (-9.13%)
Close on Nov 13, 2026Market cap $315.93MP/E –Yield –
Ownership
Institutional holdings as of Jun 30, 2026, from 13F filings
Held by institutions
16.1%
49M of 302M shares
Institutional holders
71
22 new, 21 sold out
Net institutional buying
5M
In Q2 2026
Insider trades, 12 months
0 buys · 6 sales
Net sold $1.07M
Shares held by institutions
Holders of more than 5%
Latest Schedule 13D (active) or 13G (passive) filed by each holder
| Holder | Shares | % of class | Filing | As of |
|---|---|---|---|---|
| Tolerantia, LLC Joint filing with Pablo Legorreta (36.50%) | 106,901,339 | 36.50% | 13D (active) amendment | Jun 3, 2025 |
| Carlos Slim Domit Joint filing with Carlos Slim Helu (36.00%), Marco Antonio Slim Domit (36.00%) and 5 more | 73,842,723 | 36.00% | 13D (active) amendment | Apr 28, 2026 |
| Aaron Cowen Joint filing with Suvretta Capital Management, LLC (9.80%), Averill Master Fund, Ltd. (9.10%) and 1 more | 13,198,766 | 10.47% | 13G (passive) amendment | Aug 28, 2024 |
Top institutional holders
13F holdings as of Jun 30, 2026
| Holder | Shares | % of PROK | Value | Change | % of portfolio |
|---|---|---|---|---|---|
| Suvretta Capital Management, LLC | 12,341,266 | 4.08% | $25.18M | – | 0.46% |
| Morgan Stanley | 9,854,178 | 3.26% | $20.10M | +898,211 | 0.00% |
| BlackRock, Inc. | 5,197,227 | 1.72% | $10.60M | +3,810,111 | 0.00% |
| Geode Capital Management, LLC | 2,390,147 | 0.79% | $4.88M | +1,159,738 | 0.00% |
| Bleichroeder LP | 2,000,000 | 0.66% | $4.08M | – | 0.73% |
| Hennion & Walsh Asset Management, Inc. | 1,847,749 | 0.61% | $3.77M | +236,056 | 0.11% |
| Artia Global Partners LP | 1,806,939 | 0.60% | $3.69M | – | 0.68% |
| Vanguard Capital Management LLC | 1,175,257 | 0.39% | $2.40M | +28,320 | 0.00% |
| Renaissance Technologies LLC | 1,099,400 | 0.36% | $2.24M | −151,394 | 0.00% |
| Millennium Management LLC | 1,054,705 | 0.35% | $2.15M | −1,216,872 | 0.00% |
| State Street Corp | 1,045,945 | 0.35% | $2.13M | +489,100 | 0.00% |
| Brown University | 1,000,000 | 0.33% | $2.04M | – | 1.83% |
| Charles Schwab Investment Management Inc | 781,729 | 0.26% | $1.59M | +153,958 | 0.00% |
| UBS Group AG | 671,447 | 0.22% | $1.37M | +336,901 | 0.00% |
| Northern Trust Corp | 664,827 | 0.22% | $1.36M | +423,247 | 0.00% |
| MYDA Advisors LLC | 640,775 | 0.21% | $1.31M | +212,000 | 0.19% |
| Vanguard Fiduciary Trust Co | 632,149 | 0.21% | $1.29M | +93,778 | 0.00% |
| Bank Of America Corp /De/ | 545,158 | 0.18% | $1.11M | −208,254 | 0.00% |
| Vanguard Portfolio Management LLC | 517,082 | 0.17% | $1.05M | New | 0.00% |
| Voleon Capital Management LP | 473,307 | 0.16% | $965.55K | +370,609 | 0.02% |
Institutional buying and selling by quarter
Positions opened, added to, reduced and closed by 13F filers
| Quarter | Holders | Shares held | % of shares | New / added | Reduced / closed | Shares bought | Shares sold |
|---|---|---|---|---|---|---|---|
| Q2 2026 | 71 | 49M | 16.1% | 22 / 25 | 11 / 21 | 10M | 5M |
| Q1 2026 | 71 | 44M | 14.4% | 17 / 19 | 22 / 8 | 4M | 2M |
| Q4 2025 | 63 | 43M | 14.2% | 18 / 22 | 16 / 11 | 9M | 1M |
| Q3 2025 | 56 | 34M | 11.4% | 17 / 12 | 21 / 17 | 5M | 6M |
| Q2 2025 | 56 | 35M | 11.7% | 20 / 14 | 16 / 33 | 6M | 19M |
| Q1 2025 | 69 | 48M | 15.9% | 6 / 31 | 17 / 10 | 1M | 4M |
| Q4 2024 | 74 | 51M | 16.8% | 15 / 29 | 18 / 12 | 2M | 1M |
| Q3 2024 | 71 | 49M | 16.3% | 17 / 35 | 8 / 9 | 14M | 1M |
| Q2 2024 | 65 | 40M | 13.3% | 17 / 26 | 14 / 7 | 10M | 18M |
| Q1 2024 | 55 | 48M | 15.7% | 7 / 13 | 23 / 13 | 9M | 2M |
| Q4 2023 | 61 | 41M | 13.4% | 14 / 23 | 14 / 19 | 14M | 13M |
| Q3 2023 | 66 | 40M | 13.4% | 17 / 15 | 26 / 7 | 3M | 3M |
Top mutual fund and ETF holders
Latest monthly portfolio reports (Form N-PORT)
62 funds held PROK in Q2 2026, 45% of their shares through ETFs. Each fund counts once per quarter, from its quarter-end report.
| Fund | Shares | % of PROK | Value | % of fund | As of |
|---|---|---|---|---|---|
| iShares Russell 2000 ETF | 1,723,961 | 0.57% | $3.52M | 0.00% | Jun 30, 2026 |
| Vanguard Extended Market Index Fund | 1,175,257 | 0.39% | $2.40M | 0.00% | Jun 30, 2026 |
| Morgan Stanley Insight Fund | 1,119,402 | 0.37% | $2.28M | 0.19% | Jun 30, 2026 |
| Morgan Stanley Discovery Portfolio | 1,082,616 | 0.36% | $2.21M | 0.18% | Jun 30, 2026 |
| Fidelity Small Cap Index Fund | 822,120 | 0.27% | $1.27M | 0.00% | Jul 31, 2026 |
| Discovery Portfolio | 820,877 | 0.27% | $1.67M | 0.21% | Jun 30, 2026 |
| Fidelity Extended Market Index Fund | 534,209 | 0.18% | $977.60K | 0.00% | May 31, 2026 |
| Schwab U.S. Small-Cap ETF | 504,944 | 0.17% | $924.05K | 0.00% | May 31, 2026 |
| iShares Russell 2000 Growth ETF | 461,051 | 0.15% | $940.54K | 0.01% | Jun 30, 2026 |
| Inception Portfolio | 292,440 | 0.10% | $596.58K | 0.21% | Jun 30, 2026 |
| iShares Micro-Cap ETF | 253,645 | 0.08% | $517.44K | 0.03% | Jun 30, 2026 |
| EQ/Morgan Stanley Small Cap Growth Portfolio | 212,719 | 0.07% | $433.95K | 0.09% | Jun 30, 2026 |
| iShares Russell 2000 Value ETF | 207,932 | 0.07% | $424.18K | 0.00% | Jun 30, 2026 |
| Fidelity Total Market Index Fund | 192,034 | 0.06% | $351.42K | 0.00% | May 31, 2026 |
| Virtus Biotech Clinical Trials Etf | 189,520 | 0.06% | $291.86K | 0.63% | Jul 31, 2026 |
Officers, directors and major owners
People who filed Forms 3, 4 or 5 in the last two years
| Name | Role | Shares owned | % of shares | Latest filing |
|---|---|---|---|---|
| Bruce Culleton | Chief Executive Officer, Director | – | – | Nov 3, 2026 |
| Darin J. Weber | Chief Regulatory Officer | 402,283 | 0.13% | Oct 30, 2026 |
| Kenneth Thomas Locke | Chief Technical Officer | – | – | Jul 6, 2026 |
| Todd C. Girolamo | Chief Legal Officer | 327,713 | 0.11% | Jun 15, 2026 |
| James Coulston | Chief Financial Officer | 716,850 | 0.24% | Mar 3, 2026 |
| Brian JG Pereira | Director | 222,948 | 0.07% | Aug 20, 2026 |
| Uma Sinha | Director | 30,000 | 0.01% | May 29, 2026 |
| Pablo G. Legorreta | Director, 10% owner | 110,725,335 | 36.62% | May 29, 2026 |
| William F. Doyle | Director | 1,514,326 | 0.50% | May 29, 2026 |
| Alan Lotvin | Director | 1,514,326 | 0.50% | May 29, 2026 |
| Jennifer A. Fox | Director | 0 | – | May 29, 2026 |
| Santos Jose Ignacio Jimenez | Director | 0 | – | May 29, 2026 |
| Empresarial de Capitales S.A. de C.V. Control | 10% owner | 73,842,723 | 24.43% | Apr 30, 2026 |
| Aaron Cowen | 10% owner | 857,500 | 0.28% | Jul 11, 2025 |
| Tolerantia, LLC | 10% owner | 110,725,335 | 36.62% | Jun 5, 2025 |
Insider trades
Common stock transactions reported on Form 4, newest first
| Insider | Date | Transaction | Shares | Price | Value | Shares after |
|---|---|---|---|---|---|---|
| Darin J. Weber Chief Regulatory Officer | Oct 28, 2026 | Conversion | +200,000 | – | – | 200,000 |
| Brian JG Pereira Director | Aug 20, 2026 | Sale | −222,948 | $1.42 | $316.59K | 0 |
| Brian JG Pereira Director | Aug 20, 2026 | Sale | −27,052 | $1.42 | $38.41K | 0 |
| Brian JG Pereira Director | Aug 19, 2026 | Sale | −222,949 | $1.44 | $321.05K | 222,948 |
| Brian JG Pereira Director | Aug 19, 2026 | Sale | −27,051 | $1.44 | $38.95K | 27,052 |
| Brian JG Pereira Director | Aug 18, 2026 | Sale | −229,338 | $1.37 | $314.19K | 445,897 |
| Brian JG Pereira Director | Aug 18, 2026 | Sale | −27,826 | $1.37 | $38.12K | 54,103 |
| Brian JG Pereira Director | Aug 4, 2026 | Conversion | +81,929 | – | – | 81,929 |
| Brian JG Pereira Director | Aug 4, 2026 | Conversion | +675,235 | – | – | 675,235 |
| Todd C. Girolamo Chief Legal Officer | Jun 12, 2026 | Conversion | +163,857 | – | – | 327,713 |
| Empresarial de Capitales S.A. de C.V. Control 10% owner | Apr 28, 2026 | Conversion | +63,118,645 | – | – | 73,842,723 |
| Brian JG Pereira Director | Nov 13, 2025 | Sale | −447,803 | $2.37 | $1.06M | 0 |
| Brian JG Pereira Director | Nov 13, 2025 | Sale | −54,333 | $2.37 | $128.77K | 0 |
| Brian JG Pereira Director | Nov 12, 2025 | Sale | −227,431 | $2.72 | $618.61K | 447,803 |
| Brian JG Pereira Director | Nov 12, 2025 | Sale | −27,595 | $2.72 | $75.06K | 54,333 |
| Darin J. Weber Chief Regulatory Officer | Jul 8, 2025 | Sale(10b5-1 plan) | −103,480 | $3.02 | $312.51K | 0 |
| Pablo G. Legorreta Director, 10% owner | Jun 3, 2025 | Conversion | +3,823,996 | – | – | 26,441,905 |
| Pablo G. Legorreta Director, 10% owner | Jun 3, 2025 | Other | −3,823,996 | – | – | 22,617,909 |
| Empresarial de Capitales S.A. de C.V. Control 10% owner | Apr 22, 2025 | Buy | +387,393 | $0.71 | $275.05K | 73,842,723 |
| Empresarial de Capitales S.A. de C.V. Control 10% owner | Apr 17, 2025 | Buy | +25,000 | $0.75 | $18.75K | 73,455,330 |
| Empresarial de Capitales S.A. de C.V. Control 10% owner | Apr 16, 2025 | Buy | +100,000 | $0.75 | $75.00K | 73,430,330 |
| Empresarial de Capitales S.A. de C.V. Control 10% owner | Apr 15, 2025 | Buy | +468,000 | $0.70 | $327.60K | 73,330,330 |
| Empresarial de Capitales S.A. de C.V. Control 10% owner | Apr 14, 2025 | Buy | +268,105 | $0.73 | $195.72K | 72,862,330 |
| Empresarial de Capitales S.A. de C.V. Control 10% owner | Apr 11, 2025 | Buy | +1,900 | $0.61 | $1.16K | 72,594,225 |
| Empresarial de Capitales S.A. de C.V. Control 10% owner | Apr 10, 2025 | Buy | +1,032,218 | $0.61 | $629.65K | 72,592,325 |
| Tolerantia, LLC 10% owner | Feb 4, 2025 | Other | −532,535 | – | – | 22,617,909 |
| Tolerantia, LLC 10% owner | Feb 4, 2025 | Conversion | +532,535 | – | – | 23,150,444 |
| Brian JG Pereira Director | Feb 4, 2025 | Conversion | +675,234 | – | – | 675,234 |
| Brian JG Pereira Director | Feb 4, 2025 | Conversion | +81,928 | – | – | 81,928 |
| Darin J. Weber Chief Regulatory Officer | Sep 19, 2024 | Sale(10b5-1 plan) | −16,412 | $2.50 | $41.03K | 103,480 |
| Todd C. Girolamo Chief Legal Officer | Jul 31, 2024 | Conversion | +81,928 | – | – | 163,856 |
| Darin J. Weber Chief Regulatory Officer | Jul 26, 2024 | Sale(10b5-1 plan) | −826 | $2.50 | $2.07K | 119,892 |
| Darin J. Weber Chief Regulatory Officer | Jun 18, 2024 | Sale(10b5-1 plan) | −17,238 | $2.82 | $48.61K | 120,718 |
| Pablo G. Legorreta Director, 10% owner | Jun 13, 2024 | Buy | +22,617,909 | $2.42 | $54.74M | 22,617,909 |
| Empresarial de Capitales S.A. de C.V. Control 10% owner | Jun 11, 2024 | Buy | +8,264,462 | $2.42 | $20.00M | 71,560,107 |
| Darin J. Weber Chief Regulatory Officer | May 20, 2024 | Sale(10b5-1 plan) | −17,238 | $4.08 | $70.33K | 137,956 |
| Darin J. Weber SVP of Regulatory Development | Apr 22, 2024 | Sale(10b5-1 plan) | −16,438 | $2.51 | $41.26K | 155,194 |
| Darin J. Weber SVP of Regulatory Development | Apr 18, 2024 | Sale(10b5-1 plan) | −800 | $2.54 | $2.03K | 171,632 |
| Darin J. Weber SVP of Regulatory Development | Apr 16, 2024 | Sale(10b5-1 plan) | −17,238 | $2.50 | $43.10K | 172,432 |
| Darin J. Weber SVP of Regulatory Development | Apr 12, 2024 | Sale(10b5-1 plan) | −84,103 | $1.73 | $145.50K | 189,670 |
| Darin J. Weber SVP of Regulatory Development | Apr 1, 2024 | Sale(10b5-1 plan) | −300 | $1.69 | $507 | 273,773 |
| Empresarial de Capitales S.A. de C.V. Control 10% owner | Mar 25, 2024 | Buy | +30,000 | $1.43 | $42.90K | 63,295,645 |
| Empresarial de Capitales S.A. de C.V. Control 10% owner | Mar 22, 2024 | Buy | +14,000 | $1.40 | $19.60K | 63,265,645 |
| Empresarial de Capitales S.A. de C.V. Control 10% owner | Mar 20, 2024 | Buy | +33,000 | $1.40 | $46.20K | 63,251,645 |
| Empresarial de Capitales S.A. de C.V. Control 10% owner | Mar 14, 2024 | Buy | +50,000 | $1.36 | $68.00K | 63,218,645 |
| Empresarial de Capitales S.A. de C.V. Control 10% owner | Mar 13, 2024 | Buy | +50,000 | $1.50 | $75.00K | 63,168,645 |
| Darin J. Weber SVP of Regulatory Development | Feb 5, 2024 | Conversion | +137,073 | – | – | 274,073 |
| Todd C. Girolamo Chief Legal Officer | Feb 5, 2024 | Conversion | +81,928 | – | – | 81,928 |
| Pablo G. Legorreta Director, 10% owner | Feb 5, 2024 | Conversion | +748,952 | – | – | 748,952 |
| Pablo G. Legorreta Director, 10% owner | Feb 5, 2024 | Other | −748,952 | – | – | 0 |
| SC Master Holdings, LLC – | Nov 19, 2023 | Sale | −2,073,000 | $1.31 | $2.72M | 0 |
| SC Master Holdings, LLC – | Nov 19, 2023 | Sale | −5,183,367 | $1.31 | $6.79M | 0 |
| Chamath Palihapitiya 10% owner | Nov 17, 2023 | Sale | −258,400 | $1.19 | $307.50K | 5,183,367 |
| Chamath Palihapitiya 10% owner | Nov 16, 2023 | Sale | −212,100 | $1.22 | $258.76K | 5,441,767 |
| Chamath Palihapitiya 10% owner | Nov 15, 2023 | Sale | −282,300 | $1.49 | $420.63K | 5,653,867 |
| Chamath Palihapitiya 10% owner | Nov 14, 2023 | Sale | −306,200 | $1.50 | $459.30K | 5,936,167 |
| Chamath Palihapitiya 10% owner | Nov 13, 2023 | Sale | −88,700 | $1.57 | $139.26K | 6,242,367 |
| Chamath Palihapitiya 10% owner | Nov 10, 2023 | Sale | −85,900 | $1.61 | $138.30K | 6,331,067 |
| Chamath Palihapitiya 10% owner | Nov 9, 2023 | Sale | −95,900 | $1.68 | $161.11K | 6,416,967 |
| SC Master Holdings, LLC 10% owner | Nov 8, 2023 | Sale | −59,000 | $1.66 | $97.94K | 6,512,867 |
Awards, option exercises, tax withholding and gifts are shown alongside open-market buys and sales. Each name links to the filing on SEC EDGAR.
Short interest
Shares sold short and not yet bought back, as of Oct 30, 2026 (FINRA, reported twice a month)
Short % of float
21.70%
24M shares short
Days to cover
22.5
At 1M shares a day
Change since last report
-0.9%
From 25M shares
Short volume, 20 days
66.5%
Of volume reported to FINRA
Shares sold short, last 12 months
Short sale volume counts trades marked short on any given day, including market-maker hedging, so it runs far higher than the share of ProKidney's stock actually held short. Settlement fails (shares not delivered on time) peaked at 890,270 shares on Sep 21, 2026 over the last 90 days.
Planned insider sales
Notices of proposed sale filed on Form 144 before shares are sold
| Seller | Filed | Shares | Market value | Planned sale | Acquired through |
|---|---|---|---|---|---|
| Brian JG Pereira Director | Aug 18, 2026 | 81,929 | $114.00K | Aug 18, 2026 | Profits Interests |
| Brian JG Pereira Director | Aug 18, 2026 | 675,235 | $945.33K | Aug 18, 2026 | Purchase of Shares |
| Brian JG Pereira Director | Nov 12, 2025 | 81,928 | $221.21K | Nov 12, 2025 | Profits Interests |
| Brian JG Pereira Director | Nov 12, 2025 | 675,234 | $1.82M | Nov 12, 2025 | Purchase of Shares |
| Darin J. Weber Officer | Jul 8, 2025 | 103,480 | $62.76K | Jul 8, 2025 | Founders Shares |
| Darin J. Weber Officer | Sep 19, 2024 | 16,412 | $39.22K | Sep 19, 2024 | Founders Shares |
| Darin J. Weber Officer | May 20, 2024 | 68,952 | $279.60K | May 20, 2024 | Founders Shares |
| Darin J. Weber Officer | Apr 18, 2024 | 17,238 | $48.96K | Apr 18, 2024 | Founders Shares |
| Darin J. Weber Officer | Apr 16, 2024 | 17,238 | $36.03K | Apr 16, 2024 | Founders Shares |
| Darin J. Weber Officer | Apr 12, 2024 | 84,103 | $137.93K | Apr 12, 2024 | Founders Shares |
| Darin J. Weber Officer | Apr 1, 2024 | 300 | $492 | Apr 1, 2024 | Founders Shares |
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