CASTLE BIOSCIENCES INC CSTL
COM · Common Stock · CUSIP 14843C105 · ISIN US14843C1053
- SectorHealth care
- IndustryServices-Medical Laboratories
- HeadquartersFriendswood, TX
- FilingsSEC EDGAR
* Summed across managers. Shares that two managers' reports both contain – a subsidiary's holdings that its parent's report includes too, or a sub-adviser's in its client's – are counted once ($519.9k this quarter). Holder counts are more reliable. Shares outstanding: 26.8m as of 2023-07-24, from the company's own SEC filing; the percentage can still exceed 100%: lent-out shares are counted by the lender and the buyer, and some reports overlap without saying so. Implied quarter-end price ≈ $13.78. Options: 5 managers hold calls ($325.0k notional), 5 hold puts ($663.7k).
Trends to Q2 2023
Institutional holders
Managers reporting a position, each quarter
Numbers
| Quarter | Holders |
|---|---|
| Q3 2022 | 157 |
| Q4 2022 | 154 |
| Q1 2023 | 149 |
| Q2 2023 | 131 |
Buyers vs sellers
Managers adding to or starting a position, vs cutting or selling out
Numbers
| Quarter | Bought or added | Cut or sold out |
|---|---|---|
| Q4 2022 | 72 | 80 |
| Q1 2023 | 79 | 54 |
| Q2 2023 | 86 | 59 |
Calls vs puts
Options held, notional value, last 4 quarters. P/C = puts ÷ calls
Numbers
| Quarter | Calls | Puts | P/C |
|---|---|---|---|
| Q3 2022 | $5.8m | $13.0k | 0.00 |
| Q4 2022 | $946.1k | $152.6k | 0.16 |
| Q1 2023 | $686.0k | $4.5k | 0.01 |
| Q2 2023 | $325.0k | $663.7k | 2.04 |
Biggest buyers
| Granahan Investment Management, LLC | Added | +1.3m |
| JACOBS LEVY EQUITY MANAGEMENT, INC | New | +258.2k |
| MILLENNIUM MANAGEMENT LLC | Added | +210.2k |
| AMERIPRISE FINANCIAL INC | Added | +203.0k |
| Invenomic Capital Management LP | Added | +191.6k |
| Bellevue Group AG | Added | +175.2k |
| Portolan Capital Management, LLC | Added | +174.8k |
| Parkman Healthcare Partners LLC | New | +148.0k |
| RENAISSANCE TECHNOLOGIES LLC | Added | +136.0k |
| WASATCH ADVISORS LP | Added | +107.1k |
Biggest sellers
| CITADEL ADVISORS LLC | Reduced | -604.7k |
| ESSEX INVESTMENT MANAGEMENT CO LLC | Sold out | -480.9k |
| Greenhouse Funds LLLP | Reduced | -343.6k |
| Point72 Asset Management, L.P. | Sold out | -284.8k |
| DEERFIELD MANAGEMENT COMPANY, L.P. | Sold out | -272.1k |
| RTW INVESTMENTS, LP | Sold out | -258.5k |
| Stonepine Capital Management, LLC | Reduced | -200.9k |
| GOLDMAN SACHS GROUP INC | Reduced | -56.2k |
| STRS OHIO | Reduced | -53.2k |
| ISTHMUS PARTNERS, LLC | Reduced | -49.1k |
Biggest calls
| SUSQUEHANNA INTERNATIONAL GROUP, LLP | Reduced | $149.5k10.9k shares |
| CITADEL ADVISORS LLC | Reduced | $108.4k7.9k shares |
| SIMPLEX TRADING, LLC | Added | $41.0k3.0k shares |
| GROUP ONE TRADING LLC | New | $26.1k1.9k shares |
| CONCOURSE FINANCIAL GROUP SECURITIES, INC. | Unchanged | $00 shares |
Biggest puts
| SUSQUEHANNA INTERNATIONAL GROUP, LLP | New | $477.5k34.8k shares |
| MILLENNIUM MANAGEMENT LLC | New | $137.2k10.0k shares |
| SIMPLEX TRADING, LLC | New | $34.0k2.5k shares |
| CITADEL ADVISORS LLC | Added | $15.1k1.1k shares |
| CONCOURSE FINANCIAL GROUP SECURITIES, INC. | Unchanged | $00 shares |
Options at notional value: the value of the shares the contracts control, as filers report them, not what the options cost. Not included in the holders, shares or buying above.
Major shareholders (over 5%)
Anyone who owns more than 5% of a class of the company's shares has to say so: on Schedule 13D if they may try to influence or control the company, on 13G if they're a passive investor, and update it as the stake changes. Each holder's latest filing, from 19 Dec 2024 on; percentages are of the share class, as the holder worked them out.
| Holder | Stake |
|---|---|
| RTW INVESTMENTS, LP 13G · institution +2.1 pts · filed 2026-05-15 | 9.3% |
| BlackRock, Inc. 13G · institution filed 2025-04-23 | 8.2% |
Fell to 5% or below in the last year: Portolan Capital Management, LLC (4.5%, 2026-05-15), VANGUARD GROUP INC (0.0%, 2026-03-26), DIMENSIONAL FUND ADVISORS LP (3.9%, 2026-01-21)
Insider purchases and sales in Q2 2023
Shares bought or sold by the company's own officers, directors and 10% owners, in the open market or privately, as they reported to the SEC on Form 4 (due within two business days of the trade). Grants, option exercises, shares withheld for tax and gifts aren't included.
Officers and directors buying vs selling
Number of people, by quarter (10% owners not included)
Numbers
| Quarter | Buying | Bought | Selling | Sold | Sold under a plan |
|---|---|---|---|---|---|
| Q3 2021 | 0 | — | 0 | — | — |
| Q4 2021 | 0 | — | 2 | $3.9m | — |
| Q1 2022 | 0 | — | 1 | $4.8m | — |
| Q2 2022 | 1 | $24.8k | 0 | — | — |
| Q3 2022 | 0 | — | 2 | $2.4m | — |
| Q4 2022 | 1 | $25.0k | 2 | $1.8m | — |
| Q1 2023 | 0 | — | 2 | $2.5m | — |
| Q2 2023 | 1 | $69.0k | 2 | $1.8m | $739.7k |
| Date | Insider | Trade | Value |
|---|---|---|---|
| 2023-06-05 | Goldberg Ellen Director | Bought | $69.0k4.8k shares |
| 2023-05-16 | MAETZOLD DEREK J Pres. & Chief Exec. Officer, director | Sold | $28.6k1.3k shares |
| 2023-05-16 | MAETZOLD DEREK J Pres. & Chief Exec. Officer, director · By The Maetzold 2018 Remainder Trust FBO Emily Carol Kirk | Sold | $14.3k627 shares |
| 2023-05-16 | MAETZOLD DEREK J Pres. & Chief Exec. Officer, director · By The Maetzold 2018 Remainder Trust FBO Hannah Elizabeth Maetzold | Sold | $14.3k627 shares |
| 2023-05-16 | MAETZOLD DEREK J Pres. & Chief Exec. Officer, director | Sold | $14.3k626 shares |
| 2023-05-16 | MAETZOLD DEREK J Pres. & Chief Exec. Officer, director · By The Maetzold 2018 Remainder Trust FBO Peter Douglas Maetzold | Sold | $7.1k313 shares |
| 2023-05-16 | MAETZOLD DEREK J Pres. & Chief Exec. Officer, director · By The Maetzold 2018 Remainder Trust FBO John Derek Maetzold | Sold | $7.1k313 shares |
| 2023-05-15 | MAETZOLD DEREK J Pres. & Chief Exec. Officer, director | Sold | $36.1k1.5k shares |
| 2023-05-15 | MAETZOLD DEREK J Pres. & Chief Exec. Officer, director · By Derek Maetzold 2020 Irrevocable Trust | Sold | $18.0k769 shares |
| 2023-05-15 | MAETZOLD DEREK J Pres. & Chief Exec. Officer, director · By The Maetzold 2018 Remainder Trust FBO Emily Carol Kirk | Sold | $18.0k769 shares |
| 2023-05-15 | MAETZOLD DEREK J Pres. & Chief Exec. Officer, director · By The Maetzold 2018 Remainder Trust FBO John Derek Maetzold | Sold | $9.0k384 shares |
| 2023-05-15 | MAETZOLD DEREK J Pres. & Chief Exec. Officer, director · By The Maetzold 2018 Remainder Trust FBO Hannah Elizabeth Maetzold | Sold | $9.0k384 shares |
| 2023-05-15 | MAETZOLD DEREK J Pres. & Chief Exec. Officer, director · By The Maetzold 2018 Remainder Trust FBO Peter Douglas Maetzold | Sold | $9.0k384 shares |
| 2023-05-15 | MAETZOLD DEREK J Pres. & Chief Exec. Officer, director · By The Maetzold Descendants 2020 Trust | Sold | $9.0k384 shares |
| 2023-05-05 | BRADBURY DANIEL Director · By LLC | Sold | $94.9k4.4k shares |
| 2023-05-05 | BRADBURY DANIEL Director · By Daniel Bradbury Irrecovable Descendant's Trust | Sold | $31.6k1.5k shares |
| 2023-05-05 | BRADBURY DANIEL Director · By Annette Bradbury Irrecovable Descendant's Trust | Sold | $31.6k1.5k shares |
| 2023-05-04 | BRADBURY DANIEL Director · By LLC | Sold | $229.6k10.6k shares |
| 2023-05-04 | BRADBURY DANIEL Director · By Annette Bradbury Irrecovable Descendant's Trust | Sold | $76.5k3.5k shares |
| 2023-05-04 | BRADBURY DANIEL Director · By Daniel Bradbury Irrecovable Descendant's Trust | Sold | $76.5k3.5k shares |
| 2023-05-04 | MAETZOLD DEREK J Pres. & Chief Exec. Officer, director | Sold | $35.6k1.7k shares |
| 2023-05-04 | MAETZOLD DEREK J Pres. & Chief Exec. Officer, director · By The Maetzold 2018 Remainder Trust FBO Emily Carol Kirk | Sold | $30.2k1.4k shares |
| 2023-05-04 | MAETZOLD DEREK J Pres. & Chief Exec. Officer, director | Sold | $24.8k1.1k shares |
| 2023-05-04 | MAETZOLD DEREK J Pres. & Chief Exec. Officer, director · By The Maetzold 2018 Remainder Trust FBO Hannah Elizabeth Maetzold | Sold | $21.3k980 shares |
| 2023-05-04 | MAETZOLD DEREK J Pres. & Chief Exec. Officer, director · By Derek Maetzold 2020 Irrevocable Trust | Sold | $17.8k830 shares |
| 2023-05-04 | MAETZOLD DEREK J Pres. & Chief Exec. Officer, director · By The Maetzold 2018 Remainder Trust FBO John Derek Maetzold | Sold | $15.1k698 shares |
| 2023-05-04 | MAETZOLD DEREK J Pres. & Chief Exec. Officer, director · By The Maetzold 2018 Remainder Trust FBO Peter Douglas Maetzold | Sold | $15.1k697 shares |
| 2023-05-04 | MAETZOLD DEREK J Pres. & Chief Exec. Officer, director | Sold | $12.4k565 shares |
| 2023-05-04 | MAETZOLD DEREK J Pres. & Chief Exec. Officer, director · By The Maetzold Descendants 2020 Trust | Sold | $8.9k414 shares |
| 2023-04-13 | MAETZOLD DEREK J Pres. & Chief Exec. Officer, director | Sold | $41.3k1.8k shares |
The latest 30 of 64 trades.
Their holding: how much the trade added to or took from the insider's holding (direct, or the trust or fund named). The same trade is sometimes reported by more than one insider, such as a fund and the director who represents it; totals count it once. A value is left blank where the reported price is far from the market price (usually a typo).
Holders, Q2 2023
| Manager | Shares | Change |
|---|---|---|
| WASATCH ADVISORS LP 0.26% of their portfolio | 3.1m $42.4m | Added +107.1k |
| Granahan Investment Management, LLC 1.07% of their portfolio | 2.5m $34.7m | Added +1.3m |
| BlackRock Inc. 0.00% of their portfolio | 2.1m $29.2m | Added +12.1k |
| VANGUARD GROUP INC 0.00% of their portfolio | 1.4m $19.6m | Added +23.5k |
| PRINCIPAL FINANCIAL GROUP INC 0.01% of their portfolio | 1.4m $18.7m | Added +72.9k |
| Bellevue Group AG 0.22% of their portfolio | 1.1m $15.4m | Added +175.2k |
| MILLENNIUM MANAGEMENT LLC 0.02% of their portfolio | 1.0m $14.2m | Added +210.2k |
| KORNITZER CAPITAL MANAGEMENT INC /KS 0.17% of their portfolio | 648.2k $8.9m | Unchanged |
| PALISADE CAPITAL MANAGEMENT, LP 0.22% of their portfolio | 602.2k $8.3m | Added +25.2k |
| STATE STREET CORP 0.00% of their portfolio | 535.3k $7.3m | Added +12.8k |
| GEODE CAPITAL MANAGEMENT, LLC 0.00% of their portfolio | 497.7k $6.8m | Added +12.7k |
| DIMENSIONAL FUND ADVISORS LP 0.00% of their portfolio | 489.6k $6.7m | Added +5.9k |
| GW&K Investment Management, LLC 0.06% of their portfolio | 488.7k $6.7m | Reduced -6.0k |
| Portolan Capital Management, LLC 0.52% of their portfolio | 431.5k $5.9m | Added +174.8k |
| Nuveen Asset Management, LLC 0.00% of their portfolio | 416.4k $5.7m | Added +10.7k |
| Allspring Global Investments Holdings, LLC 0.01% of their portfolio | 378.4k $5.2m | Added +9.9k |
| INTRINSIC EDGE CAPITAL MANAGEMENT LLC 0.38% of their portfolio | 356.2k $4.9m | Reduced -39.6k |
| AMERIPRISE FINANCIAL INC 0.00% of their portfolio | 318.0k $4.4m | Added +203.0k |
| Invenomic Capital Management LP 0.21% of their portfolio | 278.8k $3.8m | Added +191.6k |
| JACOBS LEVY EQUITY MANAGEMENT, INC 0.02% of their portfolio | 258.2k $3.5m | New |
| NEW YORK STATE COMMON RETIREMENT FUND 0.00% of their portfolio | 241.2k $3.3m | Added +20.3k |
| NORTHERN TRUST CORP 0.00% of their portfolio | 237.1k $3.3m | Added +11.4k |
| CAPTRUST FINANCIAL ADVISORS 0.01% of their portfolio | 229.7k $3.2m | Added +61.0k |
| CHARLES SCHWAB INVESTMENT MANAGEMENT INC 0.00% of their portfolio | 186.0k $2.6m | Added +2.3k |
| BANQUE PICTET & CIE SA 0.02% of their portfolio | 183.8k $2.5m | Reduced -6.6k |
| RENAISSANCE TECHNOLOGIES LLC 0.00% of their portfolio | 172.4k $2.4m | Added +136.0k |
| First Light Asset Management, LLC 0.17% of their portfolio | 160.1k $2.2m | Reduced -1.5k |
| UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC 0.00% of their portfolio | 157.3k $3.6m | Unchanged |
| Greenhouse Funds LLLP 0.17% of their portfolio | 150.7k $2.1m | Reduced -343.6k |
| Parkman Healthcare Partners LLC 0.35% of their portfolio | 148.0k $2.0m | New |
| VOYA INVESTMENT MANAGEMENT LLC 0.00% of their portfolio | 117.0k $1.6m | Added +26.1k |
| SEI INVESTMENTS CO 0.00% of their portfolio | 110.0k $1.5m | Added +13.7k |
| STEPHENS INC /AR/ 0.03% of their portfolio | 107.9k $1.5m | Added +32.9k |
| MORGAN STANLEY 0.00% of their portfolio | 104.8k $1.4m | Added +15.9k |
| TWO SIGMA ADVISERS, LP 0.00% of their portfolio | 93.0k $1.3m | Reduced -19.3k |
| Stonepine Capital Management, LLC 0.46% of their portfolio | 92.0k $1.3m | Reduced -200.9k |
| ALGERT GLOBAL LLC 0.05% of their portfolio | 89.1k $1.2m | Added +19.7k |
| GOLDMAN SACHS GROUP INC 0.00% of their portfolio | 81.7k $1.1m | Reduced -56.2k |
| PUBLIC EMPLOYEES RETIREMENT SYSTEM OF OHIO 0.00% of their portfolio | 81.6k $1.1m | Added +14.9k |
| Bank of New York Mellon Corp 0.00% of their portfolio | 80.1k $1.1m | Reduced -1.3k |
| Advisors Capital Management, LLC 0.03% of their portfolio | 79.6k $1.1m | Added +48.5k |
| Orion Porfolio Solutions, LLC 0.01% of their portfolio | 77.5k $1.1m | Added +47.9k |
| Orion Portfolio Solutions, LLC 0.01% of their portfolio | 77.5k $1.1m | Added +47.9k |
| Numerai GP LLC 0.19% of their portfolio | 67.2k $922.0k | New |
| ExodusPoint Capital Management, LP 0.01% of their portfolio | 63.8k $875.0k | Added +41.3k |
| Connor, Clark & Lunn Investment Management Ltd. 0.00% of their portfolio | 61.5k $844.4k | Added +19.4k |
| CITADEL ADVISORS LLC 0.00% of their portfolio | 56.3k $772.2k | Reduced -604.7k |
| Swiss National Bank 0.00% of their portfolio | 55.2k $757.3k | Added +6.8k |
| JPMORGAN CHASE & CO 0.00% of their portfolio | 51.5k $706.6k | Added +7.2k |
| Cubist Systematic Strategies, LLC 0.01% of their portfolio | 47.9k $657.1k | Added +12.8k |
| ALLIANCEBERNSTEIN L.P. 0.00% of their portfolio | 44.7k $613.1k | Added +22.2k |
| BANK OF AMERICA CORP /DE/ 0.00% of their portfolio | 44.6k $612.5k | Reduced -12.5k |
| GSA CAPITAL PARTNERS LLP 0.06% of their portfolio | 40.9k $561.0k | Added +8.6k |
| TOWNSQUARE CAPITAL LLC 0.01% of their portfolio | 37.7k $517.2k | Added +24.8k |
| Schonfeld Strategic Advisors LLC 0.00% of their portfolio | 37.5k $514.9k | Added +11.8k |
| RHUMBLINE ADVISERS 0.00% of their portfolio | 37.3k $511.9k | Reduced -2.0k |
| ENVESTNET ASSET MANAGEMENT INC 0.00% of their portfolio | 35.5k $487.3k | Added +10.8k |
| ABG Innovation Capital Partners III GP Ltd 63.00% of their portfolio | 33.6k $461.3k | Unchanged |
| TWO SIGMA INVESTMENTS, LP 0.00% of their portfolio | 31.9k $437.7k | Added +9.3k |
| CREDIT SUISSE AG/ 0.00% of their portfolio | 30.9k $424.1k | Added +3.1k |
| PERKINS CAPITAL MANAGEMENT INC 0.37% of their portfolio | 30.6k $420.0k | Reduced -525 |
| CALIFORNIA STATE TEACHERS RETIREMENT SYSTEM 0.00% of their portfolio | 30.6k $419.4k | Added +1.8k |
| SIMON QUICK ADVISORS, LLC 0.04% of their portfolio | 29.1k $398.7k | Added +3.1k |
| SIGNATUREFD, LLC 0.01% of their portfolio | 28.4k $389.5k | Added +9.0k |
| STRS OHIO 0.00% of their portfolio | 28.1k $385.0k | Reduced -53.2k |
| Parallel Advisors, LLC 0.01% of their portfolio | 27.1k $371.2k | Added +5.0k |
| Knights of Columbus Asset Advisors LLC 0.03% of their portfolio | 25.9k $354.9k | Added +58 |
| Invesco Ltd. 0.00% of their portfolio | 23.7k $325.4k | Added +814 |
| JANE STREET GROUP, LLC 0.00% of their portfolio | 23.2k $317.8k | New |
| Legal & General Group Plc 0.00% of their portfolio | 20.6k $282.8k | Added +10.1k |
| Yu Fan 22.16% of their portfolio | 20.6k $282.5k | Unchanged |
| Jump Financial, LLC 0.01% of their portfolio | 19.7k $270.3k | Added +2.3k |
| Verition Fund Management LLC 0.00% of their portfolio | 17.6k $242.0k | New |
| UBS Group AG 0.00% of their portfolio | 17.3k $237.4k | Added +6.7k |
| Capital Impact Advisors, LLC 0.25% of their portfolio | 16.6k $227.1k | Added +1.1k |
| DFPG INVESTMENTS, LLC 0.02% of their portfolio | 16.2k $275.6k | New |
| Point72 Middle East FZE 0.01% of their portfolio | 15.7k $215.8k | New |
| PUTNAM INVESTMENTS LLC 0.00% of their portfolio | 15.5k $212.8k | Added +1.1k |
| PRICE T ROWE ASSOCIATES INC /MD/ 0.00% of their portfolio | 15.5k $213.0k | Added +182 |
| ISTHMUS PARTNERS, LLC 0.03% of their portfolio | 15.3k $210.5k | Reduced -49.1k |
| COMMONWEALTH EQUITY SERVICES, LLC 0.00% of their portfolio | 15.3k $210.0k | New |
| PRUDENTIAL FINANCIAL INC 0.00% of their portfolio | 14.8k $202.6k | Reduced -8.2k |
| HARBOR CAPITAL ADVISORS, INC. 0.04% of their portfolio | 14.3k $195.7k | New |
| Claybrook Capital, LLC 0.10% of their portfolio | 13.5k $185.6k | Unchanged |
| AMERICAN CENTURY COMPANIES INC 0.00% of their portfolio | 13.4k $184.3k | New |
| Channing Capital Management, LLC 0.01% of their portfolio | 13.4k $183.9k | New |
| Polar Capital Holdings Plc 0.00% of their portfolio | 13.4k $183.8k | Unchanged |
| Quantbot Technologies LP 0.01% of their portfolio | 12.9k $177.6k | Added +10.4k |
| TRUIST FINANCIAL CORP 0.00% of their portfolio | 12.9k $177.0k | New |
| Qube Research & Technologies Ltd 0.00% of their portfolio | 12.7k $174.2k | New |
| MetLife Investment Management, LLC 0.00% of their portfolio | 12.4k $169.7k | Unchanged |
| Bank Pictet & Cie (Europe) AG 0.01% of their portfolio | 12.3k $168.3k | Reduced -474 |
| AMERICAN INTERNATIONAL GROUP, INC. 0.00% of their portfolio | 12.0k $164.1k | Added +116 |
| SUSQUEHANNA INTERNATIONAL GROUP, LLP 0.00% of their portfolio | 11.6k $158.5k | Reduced -166 |
| Mirae Asset Global Investments Co., Ltd. 0.00% of their portfolio | 11.5k $158.1k | Reduced -53 |
| WELLS FARGO & COMPANY/MN 0.00% of their portfolio | 11.4k $156.6k | Added +5.6k |
| CANADA LIFE ASSURANCE Co 0.00% of their portfolio | 11.2k $155.0k | Added +2.8k |
| CITIGROUP INC 0.00% of their portfolio | 11.2k $153.3k | Added +8.4k |
| DEUTSCHE BANK AG\ 0.00% of their portfolio | 10.9k $149.0k | Reduced -4.4k |
| MANUFACTURERS LIFE INSURANCE COMPANY, THE 0.00% of their portfolio | 10.3k $141.9k | Added +711 |