Stock Trading Canary

United States · SEC Form 4 · Snapshot date: 2026-10-18 · Built: 2026-10-18 · 中文

← United States · Coverage record

US · SEC FORM 4

CASTLE BIOSCIENCES INC

CSTL · Nasdaq · CIK 0001447362 · Healthcare · Diagnostics & Research

INSIDER SIGNAL

No active buy signal

0 qualifying P purchase groups
in the current 180-day scoring window

138 Form 4 transaction lines observed in the same window
109 sales · 29 option, withholding, award, gift or other lines

Last qualifying purchase2023-06-05 · Goldberg Ellen · $69.0K

WHY NO ACTIVE SIGNAL?

Purchase activityNone
Recent buyingNone
Recent salesHigh
Buy signal statusInactive
Score anatomy

No score is calculated because there is no qualifying purchase in the active window. Unavailable inputs are not treated as zero or as a bearish signal.

ClusterNot calculated
Purchase sizeNot calculated
RoleNot calculated
RecencyNot calculated
ConvictionNot calculated

Why is there no score?

  • No qualifying open-market purchase supplies cluster, size, role, recency or conviction inputs.
  • Sales and other Form 4 activity remain visible as context and do not create a negative score.

Sales and other Form 4 activity are shown separately and do not create a negative buy signal. Absence of buying is not scored as bearish.

Insider activity timeline

Owner lanes show the latest 180 days. Symbol shape identifies the transaction type; sales remain context only.

AprMayJunJulAugSepOct
MAETZOLD DEREK JPres. & Chief Exec. Officer
▼○▼○▼○▼○▼○▼○▼○▼○▼○▼
Juvenal Tobin WChief Commercial Officer
▼▼▼▼▼▼▼▼▼▼
Oelschlager Kristen MChief Operating Officer
▼▼▼▼○▼○▼
Stokes FrankChief Financial Officer
▼
● Purchase▼ Sale○ Other

—

Purchase breadth, concentration & cluster buying

These modules activate when qualifying purchases enter the 180-day research window.

SIGNAL HISTORY

No recorded active-signal snapshot

Scores are archived only when the company qualifies for a published US buy-signal snapshot. Last qualifying purchase: 2023-06-05 · Goldberg Ellen.

Recent Form 4 activity

0Purchases
166Sales
70Other Form 4 lines
81SEC filings · 365 days
BUYING0 qualifying P line(s) · 180 days
SELLING109 sale line(s) · context only
OTHER29 exercise / withholding / award / gift / other lines
10b5-1 / PLANNEDNot assessed

P is an open-market or private purchase. S is a sale. M, F, A and G usually describe exercises, tax withholding, awards and gifts. These categories remain visually separate.

Market context

Market context has not been captured for this ticker yet. The daily market-context job processes the US universe in rotating batches.

Short interest

Short interest is external context reported to FINRA by broker-dealers. It does not affect the Insider Signal.

Shares short
1,999,726
Previous report
1,899,369
Avg daily volume
419,633
Days to cover
4.8

FINRA settlement date: 2026-09-30 · Captured 2026-10-12 · FINRA equity short interest ↗. A share count, published about a week after each of two settlement dates a month; not a percentage of shares outstanding.

Historical equity purchases

Qualifying code P transactions in the local Form 4 history, including purchases outside the current signal window.

Transaction dateReporting ownerTypeSecuritySharesAvg. priceApprox. valueSource
2023-06-05Goldberg EllenPurchase (P)Common Stock4,800USD 14.38USD 69,004SEC filing ↗
2022-11-29Olson TiffanyPurchase (P)Common Stock1,162USD 21.50USD 24,983SEC filing ↗
2022-05-12Olson TiffanyPurchase (P)Common Stock1,320USD 18.76USD 24,765SEC filing ↗

Form 4 evidence

236 transaction lines in the latest 365-day window; 2,107 in local history.

DateOwnerTypeSecuritySharesAvg. priceApprox. valueSource
2026-10-12Juvenal Tobin WSale (S)Common Stock3,288USD 33.64USD 110,608SEC filing ↗
2026-10-05MAETZOLD DEREK JSale (S)Common Stock14,496USD 35.57USD 515,565SEC filing ↗
2026-10-05MAETZOLD DEREK JOption exercise / conversion (M)Common Stock8,165USD 2.39USD 19,514SEC filing ↗
Show recent Form 4 evidence (30 grouped rows)
DateOwnerTypeSecuritySharesAvg. priceApprox. valueSource
2026-10-12Juvenal Tobin WSale (S)Common Stock3,288USD 33.64USD 110,608SEC filing ↗
2026-10-05MAETZOLD DEREK JSale (S)Common Stock14,496USD 35.57USD 515,565SEC filing ↗
2026-10-05MAETZOLD DEREK JOption exercise / conversion (M)Common Stock8,165USD 2.39USD 19,514SEC filing ↗
2026-10-01Oelschlager Kristen MSale (S)Common Stock4,153USD 35.95USD 149,318SEC filing ↗
2026-10-01Oelschlager Kristen MOption exercise / conversion (M)Common Stock4,153USD 3.38USD 14,037SEC filing ↗
2026-09-30Juvenal Tobin WSale (S)Common Stock1,034USD 34.20USD 35,363SEC filing ↗
2026-09-29Juvenal Tobin WSale (S)Common Stock5,543USD 35.50USD 196,765SEC filing ↗
2026-09-21MAETZOLD DEREK JSale (S)Common Stock14,496USD 35.33USD 512,144SEC filing ↗
2026-09-21MAETZOLD DEREK JOption exercise / conversion (M)Common Stock8,580USD 2.39USD 20,506SEC filing ↗
2026-09-15Juvenal Tobin WSale (S)Common Stock3,294USD 35.14USD 115,751SEC filing ↗
2026-09-14Juvenal Tobin WSale (S)Common Stock3,306USD 32.32USD 106,850SEC filing ↗
2026-09-11MAETZOLD DEREK JSale (S)Common Stock14,518USD 32.02USD 464,870SEC filing ↗
2026-09-11MAETZOLD DEREK JOption exercise / conversion (M)Common Stock8,584USD 2.39USD 20,516SEC filing ↗
2026-09-01Oelschlager Kristen MSale (S)Common Stock4,152USD 33.39USD 138,643SEC filing ↗
2026-09-01Oelschlager Kristen MOption exercise / conversion (M)Common Stock4,152USD 3.38USD 14,034SEC filing ↗
2026-08-31Juvenal Tobin WSale (S)Common Stock1,730USD 32.81USD 56,761SEC filing ↗
2026-08-28MAETZOLD DEREK JSale (S)Common Stock17,726USD 33.20USD 588,448SEC filing ↗
2026-08-28MAETZOLD DEREK JOption exercise / conversion (M)Common Stock12,428USD 2.39USD 29,703SEC filing ↗
2026-08-25Juvenal Tobin WSale (S)Common Stock9,050USD 35.04USD 317,112SEC filing ↗
2026-08-25Oelschlager Kristen MSale (S)Common Stock12,384USD 34.42USD 426,261SEC filing ↗
2026-08-24Oelschlager Kristen MSale (S)Common Stock12,218USD 33.69USD 411,624SEC filing ↗
2026-08-17Juvenal Tobin WSale (S)Common Stock1,730USD 29.59USD 51,191SEC filing ↗
2026-08-14Stokes FrankSale (S)Common Stock24,908USD 29.77USD 741,511SEC filing ↗
2026-08-14MAETZOLD DEREK JSale (S)Common Stock6,398USD 30.02USD 192,068SEC filing ↗
2026-08-14MAETZOLD DEREK JOption exercise / conversion (M)Common Stock1,100USD 2.39USD 2,629SEC filing ↗
2026-08-05MAETZOLD DEREK JSale (S)Common Stock3,575USD 30.68USD 109,681SEC filing ↗
2026-08-05MAETZOLD DEREK JOption exercise / conversion (M)Common Stock2,546USD 2.39USD 6,085SEC filing ↗
2026-08-04MAETZOLD DEREK JSale (S)Common Stock35,441USD 31.11USD 1,102,657SEC filing ↗
2026-08-04MAETZOLD DEREK JOption exercise / conversion (M)Common Stock20,356USD 2.39USD 48,651SEC filing ↗
2026-08-03Oelschlager Kristen MSale (S)Common Stock8,586USD 29.77USD 255,622SEC filing ↗

Multiple price lines in one filing are grouped and share-weighted. Price and value are blank when a grouped filing line lacks price evidence.

Snapshot & identity

Snapshot date2026-10-18
Ranking versionUS-v1.2
Data qualityPASS ELIGIBLE · —
TickerCSTL
CIK0001447362
SectorHealthcare
IndustryDiagnostics & Research Yahoo Finance
SEC SIC8071 Services-Medical Laboratories
ExchangeNasdaq

Data coverage

Local Form 4 history2,107 transaction lines from 2020-01-28 to 2026-10-12
5 P purchase lines · 1,845 S sale lines · 257 other lines
SEC company submissionsOpen SEC filings ↗

Local ledger as of 2026-10-18. Mapping status is an audit field and does not erase SEC filing evidence.