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CSTL · Castle Biosciences Inc
> Ask across nine datasets ⌘K
LIVE
TEAM-2.62% 13F +440META+1.00% 13F +2,694RCG+0.35% CLUSTERUTHR-0.54% 13F +425CRWV+5.68% 13F +694CRM-1.97% 13F +1,019CVNA+1.58% 13F +795TPL-1.11% 13F +444NET-1.96% 13F +711MSTR-1.39% 13F +527DELL+1.50% 13F +1,204CRWD-0.87% 13F +1,383ANET+1.22% 13F +1,324COIN-4.18% 13F +475TEAM-2.62% 13F +440META+1.00% 13F +2,694RCG+0.35% CLUSTERUTHR-0.54% 13F +425CRWV+5.68% 13F +694CRM-1.97% 13F +1,019CVNA+1.58% 13F +795TPL-1.11% 13F +444NET-1.96% 13F +711MSTR-1.39% 13F +527DELL+1.50% 13F +1,204CRWD-0.87% 13F +1,383ANET+1.22% 13F +1,324COIN-4.18% 13F +475
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CSTL

CASTLE BIOSCIENCES INC
HEALTHCARE SERVICES · SERVICES-MEDICAL LABORATORIES · CIK 0001447362
FORM 144 · 7☆ WATCH
INSIDER NET · 180D
-$10.6M
open-market buys minus sells, Form 4 codes P and S
INSIDER BUYERS · 180D
0
CONGRESS BUYERS · 1Y
0
FUNDS ADDED · QTR
105
13F, latest reported quarter
REVENUE GROWTH
+3.7%
XBRL, annual
NET MARGIN
-7.0%
CONVERSIONS · 180D
29
codes C/M, not in net · $275.7K priced
SEVEN FACTS, RANKED AGAINST THE SECTOR · RANK IS NOT A FORECAST
INSIDERS
net -$10.6M over 180 days
-$6.8M over 90 days
below 68% of Healthcare Services
CONGRESS
no member of Congress has reported trading it
FUNDS
105 funds added or opened last quarter
below 58% of Healthcare Services
REVENUE
+3.7% year over year
below 71% of Healthcare Services
MARGIN
-7.0% net margin
below 65% of Healthcare Services
BUYBACKS
no share repurchases reported
SHORT
5.1% of shares outstanding short · 3.2 days to cover · settled 2026-07-31
more than 71% of Healthcare Services
THE SITUATION · EVERY LINE IS ONE RULE OVER ONE DATASET
Insiders are net sellers: -$10.6M across 4 people in 180 days.
105 funds added or opened positions in the latest 13F quarter, of 181 holders.
The year, with the filings on it
Total return indexed to 100 over the last 12 months · every marker is a federal filing, placed at its date — hover any marker for the detail
TOTAL 12M RETURN +35.9%
+35.9%12M
-25%+9%+44%+78%2025-092025-102025-122026-032026-052026-072026-09 2026-08-14 · Stokes Frank sold $741.5K2025-12-15 · MAETZOLD DEREK J sold $717.4K2025-11-11 · Oelschlager Kristen M sold $664.5K2026-03-12 · MAETZOLD DEREK J sold $586.0K2025-12-17 · Oelschlager Kristen M sold $585.2K2026-03-12 · Juvenal Tobin W sold $526.6K2025-12-11 · Juvenal Tobin W sold $494.7K2025-12-16 · MAETZOLD DEREK J sold $494.2K2026-03-17 · MAETZOLD DEREK J sold $483.6K2026-03-16 · MAETZOLD DEREK J sold $453.0K2026-03-11 · MAETZOLD DEREK J sold $452.0K2026-08-24 · Oelschlager Kristen M sold $411.6K2026-08-28 · MAETZOLD DEREK J sold $380.2K2026-08-04 · MAETZOLD DEREK J sold $374.0K2026-03-13 · MAETZOLD DEREK J sold $336.0K2026-08-03 · MAETZOLD DEREK J sold $323.7K2025-10-31 · Oelschlager Kristen M sold $317.5K2026-08-25 · Juvenal Tobin W sold $317.1K2026-08-04 · MAETZOLD DEREK J sold $259.3K2026-08-25 · Oelschlager Kristen M sold $245.4K2026-07-31 · Juvenal Tobin W sold $235.0K2026-07-31 · Juvenal Tobin W sold $215.0K2025-11-25 · MAETZOLD DEREK J sold $204.9K2026-07-01 · Oelschlager Kristen M sold $199.7K2025-11-04 · MAETZOLD DEREK J sold $196.4K2026-07-31 · MAETZOLD DEREK J sold $195.4K2025-11-11 · Stokes Frank sold $189.0K2026-08-25 · Oelschlager Kristen M sold $180.9K2026-06-16 · Oelschlager Kristen M sold $177.8K2025-11-26 · MAETZOLD DEREK J sold $170.7K2025-12-11 · Stokes Frank sold $168.4K2026-03-05 · Stokes Frank sold $167.9K2025-11-20 · Juvenal Tobin W sold $167.0K2026-01-20 · MAETZOLD DEREK J sold $160.7K2026-04-06 · MAETZOLD DEREK J sold $155.5K2026-07-01 · MAETZOLD DEREK J sold $150.9K2026-08-04 · MAETZOLD DEREK J sold $149.8K2026-03-03 · Stokes Frank sold $144.8K2026-07-27 · MAETZOLD DEREK J sold $144.3K2026-03-05 · Cole G Bradley sold $135.0K2026-08-03 · Oelschlager Kristen M sold $134.6K2026-09-01 · Oelschlager Kristen M sold $131.8K2026-08-25 · Tobin Juvenal filed to sell $787.5K2026-08-24 · Kristen M. Oelschlager filed to sell $841.4K2026-08-14 · FRANKLIN M. STOKES filed to sell $741.5K2026-08-14 · Derek Maetzold filed to sell $764.0K2026-07-31 · Derek Maetzold filed to sell $1.9M2026-07-31 · Tobin Juvenal filed to sell $630.0K2026-07-01 · Derek Maetzold filed to sell $589.2K
INSIDER SELLFORM 144
INDEXED RETURN, DIVIDEND-ADJUSTED — NOT A PRICE CHART · LARGE TRADES DRAWN FIRST WHEN A NAME FILES HEAVILY
Live price
Daily candles from TradingView, on their licence — no filings are marked on this one
WHY THIS NAME IS ON THE DESK
Insiders have filed to sell — before selling.
The record shows a net $10.6M sold by insiders over 180 days, 105 funds added last quarter, $6.2M in planned Form 144 sales. Every figure is a federal filing, dated the day it became public.
Backtest this pattern Open the screener
Same sector, ranked by filing activity
Sector from the SEC's own SIC classification
NTRAPGNYHIMSWGSPRVATDOCAVAHGHADUSSERABDSXENSG
Insider transactions
Form 4 purchases and sales (codes P and S) — grants, option exercises and preferred conversions excluded

Over the last 180 days, CASTLE BIOSCIENCES INC insiders sold a net $10.6M of stock across 1,140 Form 4 purchases and sales, with 0 insider(s) buying. Source: SEC Form 4 filings, as of 2026-09-06.

INSIDER
FILED
SHARES
VALUE
Oelschlager Kristen M
Chief Operating Officer
SELL
2026-09-01
3,952.0
$131.8K
Oelschlager Kristen M
Chief Operating Officer
SELL
2026-09-01
200.0
$6.8K
Juvenal Tobin W
Chief Commercial Officer
SELL
2026-08-31
1,730.0
$56.8K
MAETZOLD DEREK J
Pres. & Chief Exec. Officer
SELL
2026-08-28
11,472.0
$380.2K
MAETZOLD DEREK J
Pres. & Chief Exec. Officer
SELL
2026-08-28
2,505.0
$83.0K
1,140 TRANSACTIONS ON RECORD

Showing the most recent few. Create a free account to see 1,135 more transactions on record, the cross-source screener and CSV export. We store only your email address, and there is no password to create.

Institutional holders
13F · holdings as of the latest quarter funds have reported
BlackRock, Inc.
3,291,963.0 sh
$78.5M
RTW INVESTMENTS, LP
2,778,335.0 sh
$66.3M
PRINCIPAL FINANCIAL GROUP INC
1,726,648.0 sh
$41.2M
VANGUARD CAPITAL MANAGEMENT LLC
1,226,497.0 sh
$29.3M
Allianz Asset Management GmbH
879,258.0 sh
$21.0M
SCHEDULE 13D/G
No 5%+ ownership filings
Nobody has crossed 5% with a filing obligation. Absence is a fact here, not missing data.
Planned sales · Form 144
Filed before the sale — intent, not a trade
Tobin Juvenal
FILED 2026-08-25
$787.5K
Kristen M. Oelschlager
FILED 2026-08-24
$841.4K
FRANKLIN M. STOKES
FILED 2026-08-14
$741.5K
Derek Maetzold
FILED 2026-08-14
$764.0K
Derek Maetzold
FILED 2026-07-31
$1.9M
Fund concentration
N-PORT · funds ranked by how much of THEMSELVES they put in this stock — the conviction number 13F cannot show
Advisors Capital Small/Mid Cap Fund
$3.3M POSITION · AS OF 2026-03-31
2.9%
State Street(R) SPDR(R) S&P(R) Health Care Services ETF
$1.6M POSITION · AS OF 2026-03-31
1.9%
Buffalo Small Cap Growth Fund
$5.9M POSITION · AS OF 2026-03-31
1.5%
Wasatch Micro Cap Fund
$6.8M POSITION · AS OF 2026-03-31
1.2%
Wasatch Ultra Growth Fund
$4.2M POSITION · AS OF 2026-03-31
1.0%
Buffalo Early Stage Growth Fund
$605.7K POSITION · AS OF 2026-03-31
1.0%
SEC N-PORT, MONTHLY WITH A ~60-DAY PUBLIC LAG · FUNDS ≥ $10M · % = SHARE OF THE FUND'S OWN BOOK
Clinical pipeline
ClinicalTrials.gov · 1 registered trials, 1 still enrolling or running — a status change here is dated weeks before the press release
1
Not applicable
1 ACTIVE
TRIALS MATCHED TO THIS TICKER BY SPONSOR NAME · STUDIES RUN UNDER A SUBSIDIARY'S OWN NAME ARE NOT INCLUDED
Executive pay vs shareholder return · Mr. Maetzold
DEF 14A pay-versus-performance disclosure · both the headline pay and the SEC's mark-to-market figure, beside the return the company delivered and the return of the peer group it chose itself
FY
CEO TOTAL
ACTUALLY PAID
OTHER NEOs AVG
TSR
PEER TSR
2025
$6.8M
$13.2M
$2.4M
-42%
+25%
2024
$6.9M
$10.0M
$2.4M
-60%
-7%
2023
$1.6M
$779.8K
$845.9K
-68%
-6%
2022
$7.6M
$3.1M
$2.7M
-65%
-10%
2021
$6.5M
$2.1M
$2.8M
-36%
+0%
TAGGED BY THE COMPANY UNDER SEC ITEM 402(v) · RETURN IS CUMULATIVE FROM THE START OF THE DISCLOSURE PERIOD · GREEN WHERE THE COMPANY BEAT ITS OWN PEER GROUP
Fundamentals
Annual figures from XBRL filings · pick a past date to see them exactly as the market knew them then — restatements and all
2025-122024-122023-122022-12
REVENUE$344.2M$332.1M$219.8M$137.0M
OPERATING INCOME$-42.8M$8.7M$-68.0M$-72.9M
NET INCOME$-24.2M$18.2M$-57.5M$-67.1M
EPS (DILUTED)-0.830.62-2.14-2.58
OPERATING CASH FLOW$64.3M$64.9M$-5.6M$-41.7M
CASH$116.7M$119.7M$98.8M$122.9M
LONG-TERM DEBT$9.6M$9.7M$0—
SEC XBRL · FISCAL-YEAR PERIODS · AS KNOWN ON 2026-09-06 · NOBODY ELSE SHOWS FUNDAMENTALS AS OF A PAST DATE
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Public filings, honestly analyzed. Official US government sources in one desk — every figure carries the date it was filed, and the methodology is published, backtest included.

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© 2026 WAVEMAN · SOURCE: SEC EDGAR & OFFICIAL GOVERNMENT DATA · NOT INVESTMENT ADVICE · CHART BY TRADINGVIEW · UPDATED 2026-09-06 ALL SYSTEMS LIVE FOR MACHINES →