Skip to content
Disclosery

CSTL CASTLE BIOSCIENCES INC

Follow

COMMON STOCK (common), issuer CIK 1447362

180 managers (187 13F filers) reported a position in CSTL shares at 2026-03-31, 27,609,819 shares in all. 24 filers opened a position and 36 filers sold out during the quarter.

Managers
180
13F filers
187
New
24
Added
72
Reduced
61
Sold out
36
Shares held by filers
27,609,819

Shares held by filers adds up every 13F filer's report, so a share reported by a parent and by its subsidiary counts twice (H9). Managers counts each filer group once.

13D and 13G filers

No 13D or 13G on this security in the data. Structured 13D/G data starts 2024-12-18.

Insider trades

The latest Form 4 transactions, non-derivative.
OwnerDateSharesPriceFiling
MAETZOLD DEREK Jdirector, officer (Pres. & Chief Exec. Officer)2026-10-05-2,718 S$35.566Form 4
MAETZOLD DEREK Jdirector, officer (Pres. & Chief Exec. Officer)2026-10-05-3,198 S$35.566Form 4
MAETZOLD DEREK Jdirector, officer (Pres. & Chief Exec. Officer)2026-10-05-8,580 S$35.566Form 4
MAETZOLD DEREK Jdirector, officer (Pres. & Chief Exec. Officer)2026-10-05+8,165 M$2.39Form 4

13F holders, Q1 2026

Filers in the available 13F reports with a share position at 2026-03-31, filer groups collapsed to one row (method), largest first. Options and principal amounts are left out. A group row states no % of portfolio, since each member reports its own portfolio: the members' percents are listed under it. A value about 1,000 times or 1/1,000 of the price other filers imply is shown as filed but neither ranks the row nor enters a sum.

HolderSharesValue% of portfolioChangeSource
BlackRock, Inc.in group BlackRock, Inc.2,982,946$73.2M<0.01%-122,30013F-HRTimelineGroup
RTW INVESTMENTS, LP2,758,335$67.7M0.67%+643,09813F-HRTimeline
VANGUARD GROUP INCgroup of 6 filers holding2,264,212$55.6MnewTimeline
PRINCIPAL FINANCIAL GROUP INCin group PRINCIPAL FINANCIAL GROUP INC1,769,877$43.5M0.02%-37,76713F-HRTimelineGroup
Portolan Capital Management, LLCin group Portolan Capital Management, …1,350,283$33.1M1.76%-379,18013F-HRTimelineGroup
DIMENSIONAL FUND ADVISORS LPin group DIMENSIONAL FUND ADVISORS LP1,039,761$25.5M0.01%-104,03813F-HRTimelineGroup
SUMMIT PARTNERS PUBLIC ASSET MANAGEMENT…in group SUMMIT PARTNERS PUBLIC ASSET …940,685$23.1M1.07%-118,04013F-HRTimelineGroup
Allianz Asset Management GmbHin group Allianz SE811,324$19.9M0.02%+189,02513F-HRTimelineGroup
STATE STREET CORPin group STATE STREET CORP769,079$18.9M<0.01%+32,62513F-HRTimelineGroup
GEODE CAPITAL MANAGEMENT, LLCin group GEODE CAPITAL MANAGEMENT, LLC728,100$17.9M<0.01%+13,18713F-HRTimelineGroup
AIGH Capital Management LLC590,601$14.5M2.97%-34,11813F-HRTimeline
Qube Research & Technologies Ltd559,583$13.7M0.02%+324,06513F-HRTimeline
PALISADE CAPITAL MANAGEMENT, LP535,884$13.2M0.44%-31,89313F-HRTimeline
RENAISSANCE TECHNOLOGIES LLC532,800$13.1M0.02%+39,70013F-HRTimeline
Nuveen, LLCin group TIAA522,127$12.8M<0.01%-2,55413F-HRTimelineGroup
ACADIAN ASSET MANAGEMENT LLCin group ACADIAN ASSET MANAGEMENT LLC484,441$11.9M0.02%+94,03513F-HRTimelineGroup
WASATCH ADVISORS LP455,036$11.2M0.07%-82,20513F-HRTimeline
MORGAN STANLEYin group MORGAN STANLEY428,934$10.5M<0.01%+225,35713F-HRTimelineGroup
EVENTIDE ASSET MANAGEMENT, LLC386,425$9.49M0.16%+81,42513F-HRTimeline
Connor, Clark & Lunn Investment Managem…377,082$9.26M0.02%-11,40913F-HRTimeline
MILLENNIUM MANAGEMENT LLCin group MILLENNIUM MANAGEMENT LLC353,319$8.67M0.01%+44,40513F-HRTimelineGroup
GOLDMAN SACHS GROUP INCin group GOLDMAN SACHS GROUP INC341,171$8.38M<0.01%+53,93613F-HRTimelineGroup
SCHRODER INVESTMENT MANAGEMENT GROUP298,941$7.04M0.01%-193,22013F-HRTimeline
NORTHERN TRUST CORPin group NORTHERN TRUST CORP273,101$6.7M<0.01%+10,85813F-HRTimelineGroup
SILVERCREST ASSET MANAGEMENT GROUP LLC268,535$6.59M0.05%+63,53313F-HRTimeline
KORNITZER CAPITAL MANAGEMENT INC /KS264,396$6.49M0.14%-3,33713F-HRTimeline
BRIDGEWAY CAPITAL MANAGEMENT, LLC255,184$6.26M0.13%+8,26413F-HRTimeline
TWO SIGMA INVESTMENTS, LPin group TWO SIGMA INVESTMENTS, LP248,840$6.11M0.01%+164,77413F-HRTimelineGroup
Advisors Capital Management, LLC248,376$6.1M0.07%-2,30113F-HRTimeline
SG Americas Securities, LLC244,886$6.01M0.01%+223,62413F-HRTimeline
CHARLES SCHWAB INVESTMENT MANAGEMENT INCin group Charles Schwab Trust Co241,880$5.94M<0.01%-65513F-HRTimelineGroup
NEW YORK STATE COMMON RETIREMENT FUND233,046$5.72M0.01%013F-HRTimeline
TUDOR INVESTMENT CORP ET AL222,982$5.47M0.03%+55,80413F-HRTimeline
PANAGORA ASSET MANAGEMENT INC222,353$5.46M0.02%+176,35813F-HRTimeline
D. E. Shaw & Co., Inc.in group D. E. Shaw & Co., Inc.211,966$5.2M<0.01%+52,25713F-HRTimelineGroup
Allspring Global Investments Holdings, …in group Allspring Global Investments …160,663$3.94M0.01%+1,49213F-HRTimelineGroup
Campbell & CO Investment Adviser LLC148,824$3.65M0.21%new13F-HRTimeline
Empowered Funds, LLC132,184$3.25M0.02%+10,26413F-HR/ATimeline
Trexquant Investment LP130,434$3.2M0.02%+65,82913F-HRTimeline
Parkman Healthcare Partners LLC126,150$3.1M0.32%-24,40813F-HRTimeline
BNP PARIBAS FINANCIAL MARKETSin group BNP PARIBAS FINANCIAL MARKETS122,156$3M<0.01%-27,85513F-HRTimelineGroup
CITADEL ADVISORS LLCin group CITADEL ADVISORS LLC120,977$2.97M<0.01%-245,37913F-HRTimelineGroup
UBS Group AGgroup of 2 filers holding114,127$2.8M-97,374Timeline
FRANKLIN RESOURCES INCin group Franklin Resources90,909$2.23M<0.01%+10,30613F-HRTimelineGroup
Bank of New York Mellon Corpin group Bank of New York Mellon Corp88,654$2.18M<0.01%+1,67013F-HRTimelineGroup
JPMORGAN CHASE & COin group JPMORGAN CHASE & CO88,771$2.09M<0.01%-1,26113F-HR/ATimelineGroup
AMERICAN CENTURY COMPANIES INCin group AMERICAN CENTURY COMPANIES INC79,107$1.94M<0.01%+1,33913F-HRTimelineGroup
Orion Porfolio Solutions, LLC74,896$1.84M0.02%+24313F-HRTimeline
MACKENZIE FINANCIAL CORP74,111$1.82M<0.01%+36,79413F-HRTimeline
BANK OF AMERICA CORP /DE/in group BANK OF AMERICA CORP /DE/67,810$1.66M<0.01%-195,20913F-HRTimelineGroup
SummitTX Capital, L.P.67,033$1.65M0.05%+49,62313F-HRTimeline
AQR CAPITAL MANAGEMENT LLCin group AQR CAPITAL MANAGEMENT LLC64,880$1.59M<0.01%+99913F-HRTimelineGroup
ENVESTNET ASSET MANAGEMENT INCin group ENVESTNET ASSET MANAGEMENT INC61,865$1.52M<0.01%-10113F-HRTimelineGroup
Invesco Ltd.in group Invesco Ltd.61,012$1.5M<0.01%-74,44913F-HRTimelineGroup
Swiss National Bank57,300$1.41M<0.01%013F-HRTimeline
FMR LLCin group FMR LLC50,412$1.24M<0.01%+8,12613F-HRTimelineGroup
Man Group plcin group Man Group plc47,138$1.16M<0.01%+35,55313F-HRTimelineGroup
FORMULA GROWTH LTD46,000$1.13M0.51%new13F-HRTimeline
Quantinno Capital Management LP45,476$1.12M<0.01%+36,14413F-HRTimeline
JANE STREET GROUP, LLCin group JANE STREET GROUP, LLC42,562$1.04M<0.01%-126,08413F-HRTimelineGroup
Schonfeld Strategic Advisors LLC42,413$1.04M0.01%+20,93713F-HRTimeline
ALLIANCEBERNSTEIN L.P.25,270$983K<0.01%013F-HRTimeline
RHUMBLINE ADVISERS38,378$942K<0.01%-9013F-HRTimeline
PRICE T ROWE ASSOCIATES INC /MD/37,792$928K<0.01%+3,65413F-HRTimeline
KBC Group NVin group KBC Group NV36,932$907K<0.01%new13F-HRTimelineGroup
NOMURA HOLDINGS INCin group NOMURA ASSET MANAGEMENT CO LTD35,748$878K0.01%new13F-HRTimelineGroup
SEI INVESTMENTS COin group SEI INVESTMENTS CO35,046$860K<0.01%-4,68113F-HRTimelineGroup
ALGERT GLOBAL LLC34,778$854K0.01%+15,80013F-HR/ATimeline
Universal- Beteiligungs- und Serviceges…in group Universal- Beteiligungs- und …34,387$844K<0.01%+5,03013F-HRTimelineGroup
ExodusPoint Capital Management, LP32,608$801K0.01%new13F-HRTimeline
Corient Private Wealth LPin group Corient Private Wealth LP31,870$782K<0.01%new13F-HRTimelineGroup
CALIFORNIA STATE TEACHERS RETIREMENT SY…27,513$675K<0.01%-21213F-HRTimeline
ARROWSTREET CAPITAL, LIMITED PARTNERSHIPin group ARROWSTREET CAPITAL, LIMITED …27,142$666K<0.01%+20,11313F-HRTimelineGroup
BARCLAYS PLCin group BARCLAYS PLC26,810$658K<0.01%-45,33913F-HRTimelineGroup
HARBOR CAPITAL ADVISORS, INC.25,614$629K0.05%+12,18213F-HRTimeline
FOX RUN MANAGEMENT, L.L.C.26,247$618K0.11%+4,36313F-HRTimeline
STRS OHIO25,000$614K<0.01%+12,40013F-HRTimeline
DEUTSCHE BANK AG\in group DEUTSCHE BANK AG\24,164$593K<0.01%+1,78013F-HRTimelineGroup
TRUIST FINANCIAL CORPin group TRUIST FINANCIAL CORP23,781$584K<0.01%+15313F-HRTimelineGroup
Y-Intercept (Hong Kong) Ltd23,501$577K0.01%+10,25513F-HRTimeline
Magnetar Financial LLCin group Magnetar Financial LLC23,332$573K0.01%new13F-HRTimelineGroup
Legal & General Group Plcin group Legal & General Group Plc23,184$569K<0.01%-6,55113F-HRTimelineGroup
Quantbot Technologies LP22,060$542K0.02%+22,01313F-HRTimeline
Inspire Investing, LLCin group Inspire Investing, LLC21,045$517K0.03%+9,03413F-HRTimelineGroup
XTX Topco Ltdin group XTX Topco Ltd20,283$498K0.01%-1,84213F-HRTimelineGroup
Brevan Howard Capital Management LPin group Brevan Howard Capital Managem…18,560$456K<0.01%new13F-HRTimelineGroup
Engineers Gate Manager LP18,256$448K0.01%-4,69313F-HRTimeline
MetLife Investment Management, LLCin group MetLife Investment Management…16,722$411K<0.01%+84113F-HRTimelineGroup
First Bank & Trust16,504$405K0.07%-20213F-HRTimeline
Dynamic Technology Lab Private Ltd15,913$391K0.06%new13F-HRTimeline
HRT FINANCIAL LP15,858$389K<0.01%-31,79613F-HRTimeline
DIVERSIFY WEALTH MANAGEMENT, LLCin group Diversify Advisory Services, …15,760$382K0.01%+4,17213F-HRTimelineGroup
PERKINS CAPITAL MANAGEMENT INC15,415$378K0.35%-12,63013F-HRTimeline
Mirae Asset Global Investments Co., Ltd.group of 2 filers holding15,227$374K+586Timeline
JANUS HENDERSON GROUP PLCin group Janus Henderson15,037$369K<0.01%013F-HR/ATimelineGroup
Zurcher Kantonalbank (Zurich Cantonalba…15,028$369K<0.01%+3,21813F-HRTimeline
Summit Global Investmentsin group Summit Global Investments13,718$337K0.02%+1,35313F-HRTimelineGroup
Oak Harvest Investment Services13,485$331K0.03%013F-HRTimeline
Parallel Advisors, LLC13,301$327K0.01%-68513F-HR/ATimeline
Birchview Capital, LP12,900$317K0.18%-67,70013F-HRTimeline
WELLS FARGO & COMPANY/MNin group WELLS FARGO & COMPANY/MN12,892$316K<0.01%-21,32013F-HR/ATimelineGroup
LOS ANGELES CAPITAL MANAGEMENT LLC12,728$312K<0.01%-10,90313F-HRTimeline
Creative Planningin group Creative Planning12,479$306K<0.01%-3,66213F-HRTimelineGroup
MANUFACTURERS LIFE INSURANCE COMPANY, T…in group MANUFACTURERS LIFE INSURANCE …12,438$305K<0.01%+3,95113F-HRTimelineGroup
Jump Financial, LLCin group Jump Financial, LLC12,300$302K<0.01%+6,80013F-HRTimelineGroup
GSA CAPITAL PARTNERS LLP12,236$300K0.02%new13F-HRTimeline
CANADA PENSION PLAN INVESTMENT BOARD11,400$280K<0.01%+5,10013F-HRTimeline
Jackson Creek Investment Advisors LLC11,214$275K0.08%-2113F-HRTimeline
Graham Capital Management, L.P.11,133$273K0.01%+20513F-HRTimeline
TritonPoint Partners, LLCin group TritonPoint Partners, LLC10,777$265K0.1%013F-HRTimelineGroup
Lido Advisors, LLCin group Lido Advisors, LLC10,031$246K<0.01%-513F-HRTimelineGroup
Green Alpha Advisors, LLC9,945$244K0.24%-29113F-HRTimeline
LPL Financial LLC9,700$238K<0.01%-1,17713F-HRTimeline
State of Wyoming9,522$234K0.03%+6,50813F-HRTimeline
SUSQUEHANNA INTERNATIONAL GROUP, LLPin group SUSQUEHANNA INTERNATIONAL GRO…9,520$234K<0.01%new13F-HRTimelineGroup
Russell Investments Group, Ltd.in group Russell Investments Group, Lt…9,315$229K<0.01%+6,82713F-HRTimelineGroup
Cetera Investment Advisers9,208$226K<0.01%+27313F-HRTimeline
SIMON QUICK ADVISORS, LLC8,561$210K0.01%013F-HRTimeline
Numerai GP LLC8,307$204K0.02%new13F-HRTimeline
GLENMEDE TRUST CO NAin group GLENMEDE TRUST CO NA8,168$201K<0.01%-2213F-HRTimelineGroup
Police & Firemen's Retirement System of…7,829$192K<0.01%013F-HRTimeline
KLP KAPITALFORVALTNING AS6,200$152K<0.01%013F-HRTimeline
ASSETMARK, INCin group ASSETMARK, INC5,779$142K<0.01%+49213F-HRTimelineGroup
China Universal Asset Management Co., L…5,276$130K0.01%+52013F-HRTimeline
CITIGROUP INCin group CITIGROUP INC4,027$98.9K<0.01%-28,39513F-HRTimelineGroup
GLOBEFLEX CAPITAL L P3,759$92.3K0.01%013F-HRTimeline
CANADA LIFE ASSURANCE Coin group CANADA LIFE ASSURANCE Co3,244$80K<0.01%013F-HRTimelineGroup
HARBOUR INVESTMENTS, INC.3,248$79.7K<0.01%+11113F-HRTimeline
CWM, LLCin group CWM, LLC3,010$73.9K<0.01%+70813F-HRTimelineGroup
Farther Finance Advisors, LLC2,388$59.8K<0.01%-94913F-HRTimeline
Ameritas Investment Partners, Inc.in group Ameritas Investment Partners,…2,373$58.3K<0.01%013F-HRTimelineGroup
Tower Research Capital LLC (TRC)in group Tower Research Capital LLC (T…1,604$39.4K<0.01%-40913F-HRTimelineGroup
State of Alaska, Department of Revenue1,553$38K<0.01%013F-HRTimeline
FEDERATED HERMES, INC.in group FEDERATED HERMES, INC.1,249$30.7K<0.01%+58913F-HRTimelineGroup
Covestor Ltd1,096$27K0.02%+9813F-HRTimeline
Sterling Capital Management LLC971$23.8K<0.01%-66613F-HRTimeline
OSAIC HOLDINGS, INC.in group OSAIC HOLDINGS, INC.857$21K<0.01%-35,54713F-HRTimelineGroup
BNP PARIBAS ASSET MANAGEMENT Holding S.…in group BNP PARIBAS ASSET MANAGEMENT …761$18.7K<0.01%-1,07813F-HRTimelineGroup
GF FUND MANAGEMENT CO. LTD.648$15.9K<0.01%+7513F-HRTimeline
FIRST HORIZON CORP587$14.4K<0.01%-9113F-HRTimeline
Hughes Financial Services, LLC446$10.9K<0.01%+1013F-HRTimeline
Rossby Financial, LCC429$10.7K<0.01%013F-HRTimeline
Rockefeller Capital Management L.P.in group Rockefeller Capital Managemen…433$10.6K<0.01%+34613F-HRTimelineGroup
MEEDER ASSET MANAGEMENT INCin group Meeder Advisory Services, Inc.387$9.5K<0.01%new13F-HRTimelineGroup
QUADRANT CAPITAL GROUP LLC336$8.25K<0.01%013F-HR/ATimeline
GROUP ONE TRADING LLC292$7.17K<0.01%new13F-HRTimeline
Advisory Services Network, LLC287$7.05K<0.01%new13F-HRTimeline
NISA INVESTMENT ADVISORS, LLC256$6.29K<0.01%-2513F-HRTimeline
Versant Capital Management, Inc246$6.04K<0.01%+6513F-HRTimeline
JONES FINANCIAL COMPANIES LLLPin group JONES FINANCIAL COMPANIES LLLP250$5.88K<0.01%-26513F-HRTimelineGroup
MassMutual Private Wealth & Trust, FSB202$4.96K<0.01%new13F-HRTimeline
PNC Financial Services Group, Inc.in group PNC Financial Services Group,…163$4K<0.01%-38313F-HRTimelineGroup
ROYAL BANK OF CANADAin group ROYAL BANK OF CANADA177$4K<0.01%-68813F-HRTimelineGroup
HUNTINGTON NATIONAL BANKin group HUNTINGTON NATIONAL BANK139$3.41K<0.01%013F-HRTimelineGroup
Essential Partners LLC129$3.17K<0.01%-513F-HRTimeline
US BANCORP \DE\in group US BANCORP \DE\92$2.26K<0.01%+4413F-HRTimelineGroup
BFSG, LLC90$2.21K<0.01%013F-HRTimeline
Destiny Wealth Partners, LLC88$2.16K<0.01%new13F-HRTimeline
Allworth Financial LP63$1.55K<0.01%+3313F-HRTimeline
ROTHSCHILD INVESTMENT LLC58$1.42K<0.01%+513F-HRTimeline
IFP Advisors, Inc52$1.28K<0.01%013F-HRTimeline
Spire Wealth Managementin group Spire Wealth Management50$1.23K<0.01%013F-HRTimelineGroup
SBI Securities Co., Ltd.47$1.15K<0.01%-513F-HRTimeline
GAMMA Investing LLC46$1.13K<0.01%-613F-HRTimeline
SIGNATUREFD, LLC45$1.1K<0.01%013F-HRTimeline
Parkside Financial Bank & Trust25$614<0.01%013F-HRTimeline
EverSource Wealth Advisors, LLCin group EverSource Wealth Advisors, L…20$491<0.01%-813F-HR/ATimelineGroup
MAI Capital Management19$467<0.01%new13F-HRTimeline
SJS Investment Consulting Inc.19$467<0.01%new13F-HRTimeline
Missouri Trust & Investment Co19$466<0.01%013F-HRTimeline
Signature Equity Partners, LLC16$393<0.01%013F-HRTimeline
Investors Portfolio Services LLC18$325<0.01%new13F-HRTimeline
Smartleaf Asset Management LLC8$207<0.01%new13F-HRTimeline
Arax Advisory Partners4$99<0.01%-3313F-HRTimeline
Wealth Preservation Advisors, LLC4$98<0.01%new13F-HRTimeline
Sunbelt Securities, Inc.3$74<0.01%+213F-HRTimeline
True Wealth Design, LLC2$50<0.01%-313F-HRTimeline
Larson Financial Group LLC1$25<0.01%013F-HRTimeline
TWIN PEAKS WEALTH ADVISORS, LLC1$25<0.01%new13F-HRTimeline
Erste Asset Management GmbHin group Erste Asset Management GmbH0$00%new13F-HRTimelineGroupValue filed as zero, left out of ratios. Amount filed as zero, left out of ratios.

Events

  • MAETZOLD DEREK J disposed of 6,331 CSTL shares on 2026-10-05, Form 4 filed 2026-10-07. 0001628280-26-065327

    Accepted , ingested