CASTLE BIOSCIENCES, INC.
CASTLE BIOSCIENCES, INC. is a registered legal entity registered in United States under 0800979930, and its current status with Texas Secretary of State — SOSDirect is active. The company was incorporated on 16 May 2008 and lists its registered address as FRIENDSWOOD, United States. 5 shareholders are on record for CASTLE BIOSCIENCES, INC., including at least one natural person recorded as a direct holder; the filing carries no beneficial-ownership flag, so that holder is noted here as a recorded shareholder rather than a confirmed ultimate beneficial owner (UBO). This profile is sourced directly from Texas Secretary of State — SOSDirect and was last updated on 25 September 2026.
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Shareholders
5
Shareholders of CASTLE BIOSCIENCES, INC.
Five shareholders are currently on record for CASTLE BIOSCIENCES, INC., reflecting the stock ledger maintained under state corporate law (e.g. §219 of the Delaware General Corporation Law) rather than a public filing. The largest of these is Principal Financial Group, Inc., holding 9.4% — the largest recorded stake — followed by Fidelity Rutland Square TRT II-Strategic Advisers Fidelity U.S. Total at 4.4%; the remaining 3 shareholders shown hold smaller stakes. 3 shareholders shown are companies, so the ownership chain continues above this level for those holdings; the other 2 are recorded as direct individual holders, though the record carries no UBO/PSC flag confirming beneficial-owner status.
Data availability
The register reports 7 shareholders in total, though only the top 5 by holding are shown in this view.
| Shareholder | Type | Holding | Source Document |
|---|---|---|---|
| Principal Financial Group, Inc. | 9.4% | Texas Secretary of State — SOSDirect | |
| Fidelity Rutland Square TRT II-Strategic Advisers Fidelity U.S. Total | 4.4% | Texas Secretary of State — SOSDirect | |
| Fidelity Rutland Square TRT II-Strategic Advisers U.S. Total Stock Fd. | 4.4% | Texas Secretary of State — SOSDirect | |
| iShares Trust-iShares Russell 2000 ETF | 3.7% | Texas Secretary of State — SOSDirect | |
| Wasatch Advisors LP | 3.5% | Texas Secretary of State — SOSDirect |
Officers
12
Directors and officers of CASTLE BIOSCIENCES, INC.
The Founder, Ceo, President & Director of CASTLE BIOSCIENCES, INC. currently on record is Derek J. Maetzold; 12 officers are currently on record for CASTLE BIOSCIENCES, INC., filed with Texas Secretary of State — SOSDirect. Management authority at CASTLE BIOSCIENCES, INC. sits with these individuals, not with shareholders, who are covered separately and hold ownership rather than control. The source filing doesn't specify representation authority — whether officers can act individually or must sign jointly to bind the company — so that detail isn't available here.
Group Structure
Group structure of CASTLE BIOSCIENCES, INC.
CASTLE BIOSCIENCES, INC. has no recorded parent company — it sits at the top of its own group structure, with 4 subsidiaries recorded beneath it across 1 jurisdiction. Each of these downward relationships is derived rather than filed: resolved by matching entities across the registry network, not stated directly in a single document.
- Myriad Mypath, LLC (United States)
- Cernostics, Inc. (United States)
- Friendswood Parkway Plaza LLC (United States)
- Altheadx, Inc. (United States)
Data availability
Those 4 subsidiaries span United States jurisdiction, though this list should not be read as complete — subsidiaries only become visible here where shareholder data has actually been filed with a register, so holdings in jurisdictions without that filing simply won't appear.
CASTLE BIOSCIENCES, INC.
United States
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Frequently Asked Questions
Who owns CASTLE BIOSCIENCES, INC.?
Five shareholders are currently on record for CASTLE BIOSCIENCES, INC., reflecting the stock ledger maintained under state corporate law (e.g. §219 of the Delaware General Corporation Law) rather than a public filing. The largest of these is Principal Financial Group, Inc., holding 9.4% — the largest recorded stake — followed by Fidelity Rutland Square TRT II-Strategic Advisers Fidelity U.S. Total at 4.4%; the remaining 3 shareholders shown hold smaller stakes. 3 shareholders shown are companies, so the ownership chain continues above this level for those holdings; the other 2 are recorded as direct individual holders, though the record carries no UBO/PSC flag confirming beneficial-owner status.
Who is CASTLE BIOSCIENCES, INC.'s UBO (Ultimate Beneficial Owner)?
At least one shareholder recorded for CASTLE BIOSCIENCES, INC. is a natural person. The record carries no dedicated UBO/PSC flag, so that holder is stated here as a recorded shareholder rather than a confirmed Ultimate Beneficial Owner (UBO).
How many shareholders does CASTLE BIOSCIENCES, INC. have on record?
5 shareholders are shown on record for CASTLE BIOSCIENCES, INC.. The register reports 7 in total; only the top 5 by holding are shown here.
What is CASTLE BIOSCIENCES, INC.'s company registration number?
CASTLE BIOSCIENCES, INC.'s registration number is 0800979930, filed with Texas Secretary of State — SOSDirect in United States. Its current status on the register is active.
Is CASTLE BIOSCIENCES, INC. still an active company?
CASTLE BIOSCIENCES, INC.'s status on Texas Secretary of State — SOSDirect is listed as active.
When was CASTLE BIOSCIENCES, INC. incorporated?
CASTLE BIOSCIENCES, INC. was incorporated on 16 May 2008, according to Texas Secretary of State — SOSDirect.
What is CASTLE BIOSCIENCES, INC.'s registered address?
The registered address on file for CASTLE BIOSCIENCES, INC. is FRIENDSWOOD, United States.
Who are the officers/directors of CASTLE BIOSCIENCES, INC.?
The Founder, Ceo, President & Director of CASTLE BIOSCIENCES, INC. currently on record is Derek J. Maetzold; 12 officers are currently on record for CASTLE BIOSCIENCES, INC., filed with Texas Secretary of State — SOSDirect. Management authority at CASTLE BIOSCIENCES, INC. sits with these individuals, not with shareholders, who are covered separately and hold ownership rather than control.
Does CASTLE BIOSCIENCES, INC. have a parent company or subsidiaries?
CASTLE BIOSCIENCES, INC. has no recorded parent company — it sits at the top of its own group structure, with 4 subsidiaries recorded beneath it across 1 jurisdiction. Those 4 subsidiaries span United States jurisdiction, though this list should not be read as complete — subsidiaries only become visible here where shareholder data has actually been filed with a register, so holdings in jurisdictions without that filing simply won't appear.
Can Zavia monitor changes to CASTLE BIOSCIENCES, INC.'s ownership over time?
This profile reflects a point-in-time snapshot from Texas Secretary of State — SOSDirect. Zavia's monitoring API can track changes to CASTLE BIOSCIENCES, INC.'s registered shareholders, officers, and group structure going forward, flagging updates as they're filed rather than requiring a manual recheck.
Can I access CASTLE BIOSCIENCES, INC.'s data through an API?
Yes. Zavia's API connects directly to official government ownership registries across 195 countries and territories, including United States, so records like CASTLE BIOSCIENCES, INC.'s registration, shareholder, UBO, and group-structure data can be queried programmatically instead of viewed one page at a time.
Where does this company information come from, and how current is it?
This record is sourced directly from Texas Secretary of State — SOSDirect and was last synced on 25 September 2026.