# CASTLE BIOSCIENCES INC COM

CASTLE BIOSCIENCES INC COM is a security (CUSIP 14843C105) tracked across SEC portfolio filings. 188 institutional managers reported $678.0M on Form 13F as of 2026-06-30; 17 registered fund positions totaling $25.0M via N-PORT as of 2026-05-31.

## Summary

- Issuer: CASTLE BIOSCIENCES INC
- Class: COM
- CUSIP: 14843C105
- Asset category: EC
- 13F holders: 188
- 13F value: $678.0M
- 13F period: 2026-06-30
- N-PORT fund positions: 17
- N-PORT value: $25.0M
- N-PORT report: 2026-05-31

## Top institutional holders (Form 13F)

_Showing 15 of 188 managers by value._

| Manager | Location | Value | Shares |
| --- | --- | --- | --- |
| [VANGUARD GROUP INC](https://search.stillhousedata.com/firm/105958) | Valley Forge, PA | $85.6M | 2,199,829 |
| BlackRock, Inc. | New York, NY | $73.2M | 2,982,946 |
| [RTW INVESTMENTS, LP](https://search.stillhousedata.com/firm/153232) | NEW YORK, NY | $67.7M | 2,758,335 |
| PRINCIPAL FINANCIAL GROUP INC | DES MOINES, IA | $41.2M | 1,726,648 |
| Portolan Capital Management, LLC | Boston, MA | $33.1M | 1,350,283 |
| DIMENSIONAL FUND ADVISORS LP | AUSTIN, TX | $25.5M | 1,039,761 |
| [SUMMIT PARTNERS PUBLIC ASSET MANAGEMENT, LLC](https://search.stillhousedata.com/firm/175100) | Boston, MA | $23.1M | 940,685 |
| Allianz Asset Management GmbH | MUNICH, 2M | $19.9M | 811,324 |
| STATE STREET CORP | BOSTON, MA | $18.9M | 769,079 |
| [GEODE CAPITAL MANAGEMENT, LLC](https://search.stillhousedata.com/firm/115504) | BOSTON, MA | $17.9M | 728,100 |
| AIGH Capital Management LLC | BALTIMORE, MD | $14.5M | 590,601 |
| [Qube Research & Technologies Ltd](https://search.stillhousedata.com/firm/304552) | LONDON, X0 | $13.7M | 559,583 |
| PALISADE CAPITAL MANAGEMENT, LP | FORT LEE, NJ | $13.2M | 535,884 |
| [RENAISSANCE TECHNOLOGIES LLC](https://search.stillhousedata.com/firm/106661) | NEW YORK, NY | $13.1M | 532,800 |
| Nuveen, LLC | CHARLOTTE, NC | $12.8M | 522,127 |

## Top fund holders (N-PORT)

_Showing 15 of 17 fund positions by value._

| Fund | Registrant | Value | % of fund |
| --- | --- | --- | --- |
| [VANGUARD EXTENDED MARKET INDEX FUND](https://search.stillhousedata.com/fund/S000002841) | VANGUARD INDEX FUNDS | $8.0M | 0.98% |
| [VANGUARD EXPLORER FUND](https://search.stillhousedata.com/fund/S000002578) | VANGUARD EXPLORER FUND | $6.8M | 3.10% |
| [VANGUARD RUSSELL 2000 INDEX FUND](https://search.stillhousedata.com/fund/S000030003) | VANGUARD SCOTTSDALE FUNDS | $3.1M | 1.78% |
| [U.S. MICRO CAP PORTFOLIO](https://search.stillhousedata.com/fund/S000000948) | DFA INVESTMENT DIMENSIONS GROUP INC | $2.4M | 3.27% |
| [Master Small Cap Index Series](https://search.stillhousedata.com/fund/S000002716) | Quantitative Master Series LLC | $1.1M | 2.38% |
| [VANGUARD MARKET NEUTRAL FUND](https://search.stillhousedata.com/fund/S000019457) | VANGUARD MONTGOMERY FUNDS | $1.1M | 25.65% |
| [VANGUARD U.S. MOMENTUM FACTOR ETF](https://search.stillhousedata.com/fund/S000061302) | VANGUARD WELLINGTON FUND | $663K | 3.61% |
| [Goldman Sachs ActiveBeta(R) U.S. Small Cap Equity ETF](https://search.stillhousedata.com/fund/S000048296) | Goldman Sachs ETF Trust | $640K | 6.49% |
| [VANGUARD BALANCED INDEX FUND](https://search.stillhousedata.com/fund/S000002560) | VANGUARD VALLEY FORGE FUNDS | $378K | 0.06% |
| [VANGUARD INSTITUTIONAL TOTAL STOCK MARKET INDEX FUND](https://search.stillhousedata.com/fund/S000002855) | VANGUARD INSTITUTIONAL INDEX FUNDS | $305K | 0.10% |
| [BlackRock Advantage SMID Cap Fund, Inc.](https://search.stillhousedata.com/fund/S000002323) | BlackRock Advantage SMID Cap Fund, Inc. | $268K | 3.55% |
| [DWS Small Cap Index VIP](https://search.stillhousedata.com/fund/S000006223) | DEUTSCHE DWS INVESTMENTS VIT FUNDS | $100K | 2.39% |
| [Vericimetry U.S. Small Cap Value Fund](https://search.stillhousedata.com/fund/S000033942) | VERICIMETRY FUNDS | $38K | 2.28% |
| [Putnam Multi-Asset Income Fund](https://search.stillhousedata.com/fund/S000067964) | Putnam Asset Allocation Funds | $26K | 0.29% |
| [Blackstone Alternative Multi-Strategy Fund](https://search.stillhousedata.com/fund/S000045538) | Blackstone Alternative Investment Funds | $25K | 0.07% |

## More

- [This page as markdown (for LLM agents)](https://search.stillhousedata.com/security/14843C105.md)
- [Search all SEC filings, advisers and people on Adviser Search](https://search.stillhousedata.com/)

---

Source: public SEC filing data via Adviser Search (https://search.stillhousedata.com).
Agents: this data is also queryable via MCP tools and read-only SQL — see https://search.stillhousedata.com/llms.txt.