$40,000 of CASTLE BIOSCIENCES INC. lobbying was just disclosed, from Q2 of 2026, in a new Lobbying Disclosure Act filing.

This included lobbying on issues like:

"Issues relating to Medicare coverage for laboratory diagnostic services."

You can find more data on corporate lobbying on Quiver Quantitative.

CSTL Insider Trading Activity

CSTL insiders have traded $CSTL stock on the open market 68 times in the past 6 months. Of those trades, 0 have been purchases and 68 have been sales.

Here’s a breakdown of recent trading of $CSTL stock by insiders over the last 6 months:

• DEREK J MAETZOLD (Pres. & Chief Exec. Officer) has made 0 purchases and 61 sales selling 132,779 shares for an estimated $3,528,273.
• TOBIN W JUVENAL (Chief Commercial Officer) sold 20,863 shares for an estimated $526,582
• FRANK STOKES (Chief Financial Officer) has made 0 purchases and 3 sales selling 13,001 shares for an estimated $359,980.
• G BRADLEY COLE has made 0 purchases and 2 sales selling 7,403 shares for an estimated $210,727.
• KRISTEN M OELSCHLAGER (Chief Operating Officer) sold 8,587 shares for an estimated $177,836

To track insider transactions, check out Quiver Quantitative's insider trading dashboard. You can access data on insider stock transactions through the Quiver Quantitative API insider transaction endpoint.

CSTL Hedge Fund Activity

We have seen 87 institutional investors add shares of CSTL stock to their portfolio, and 83 decrease their positions in their most recent quarter.

Here are some of the largest recent moves:

• RTW INVESTMENTS, LP added 643,098 shares (+30.4%) to their portfolio in Q1 2026, for an estimated $15,788,055
• PORTOLAN CAPITAL MANAGEMENT, LLC removed 379,180 shares (-21.9%) from their portfolio in Q1 2026, for an estimated $9,308,869
• QUBE RESEARCH & TECHNOLOGIES LTD added 324,065 shares (+137.6%) to their portfolio in Q1 2026, for an estimated $7,955,795
• CITADEL ADVISORS LLC removed 245,379 shares (-67.0%) from their portfolio in Q1 2026, for an estimated $6,024,054
• MORGAN STANLEY added 225,357 shares (+110.7%) to their portfolio in Q1 2026, for an estimated $5,532,514
• SG AMERICAS SECURITIES, LLC added 223,624 shares (+1051.8%) to their portfolio in Q1 2026, for an estimated $5,489,969
• WELLINGTON MANAGEMENT GROUP LLP removed 218,560 shares (-100.0%) from their portfolio in Q1 2026, for an estimated $5,365,648

To track hedge funds' stock portfolios, check out Quiver Quantitative's institutional holdings dashboard. You can access data on hedge funds moves and 13F filings through the Quiver Quantitative API 13F endpoint.

CSTL Analyst Ratings

Wall Street analysts have issued reports on $CSTL in the last several months. We have seen 2 firms issue buy ratings on the stock, and 0 firms issue sell ratings.

Here are some recent analyst ratings:

• BTIG issued a "Buy" rating on 05/13/2026
• Lake Street issued a "Buy" rating on 01/12/2026

To track analyst ratings and price targets for CSTL, check out Quiver Quantitative's $CSTL forecast page.

CSTL Price Targets

Multiple analysts have issued price targets for $CSTL recently. We have seen 6 analysts offer price targets for $CSTL in the last 6 months, with a median target of $41.5.

Here are some recent targets:

• Max Masucci from Roth Capital set a target price of $40.0 on 06/25/2026
• Mark Massaro from BTIG set a target price of $40.0 on 05/13/2026
• Catherine Ramsey from Baird set a target price of $43.0 on 05/07/2026
• Kyle Mikson from Canaccord Genuity set a target price of $40.0 on 04/20/2026
• Subbu Nambi from Guggenheim set a target price of $47.0 on 01/26/2026
• Thomas Flaten from Lake Street set a target price of $52.0 on 01/12/2026

This article is not financial advice. See Quiver Quantitative's disclaimers for more information.

Read full article here »