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

Aptose Biosciences Inc.

APTO · — · CIK 0000882361 · Healthcare

INSIDER SIGNAL

No active buy signal

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

9 Form 4 transaction lines observed in the same window
0 sales · 9 option, withholding, award, gift or other lines

Last qualifying purchase2024-11-25 · Rice William G. · $20.0K

WHY NO ACTIVE SIGNAL?

Purchase activityNone
Recent buyingNone
Recent salesNone
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
Seizinger Bernd R.Other
○
Whitehead WarrenOther
○
Rice William G.Chair, President & CEO
○
PLATZER ERICHOther
○
Payne FletcherOther
○
BURGER DENIS ROther
○
● Purchase▼ Sale○ Other

Showing the six most active owners; 2 additional owner(s) remain in Form 4 evidence.

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: 2024-11-25 · Rice William G..

Recent Form 4 activity

0Purchases
0Sales
9Other Form 4 lines
8SEC filings · 365 days
BUYING0 qualifying P line(s) · 180 days
SELLING0 sale line(s) · context only
OTHER9 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 capture is under review for APTO. Last attempt: 2026-10-18T21:13:33.148999+00:00. —

Short interest

The FINRA report lists no short interest for this ticker.

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
2024-11-25Rice William G.Purchase (P)Common Shares100,000USD 0.20USD 20,000SEC filing ↗
2023-09-22Seizinger Bernd R.Purchase (P)Common Shares17,000USD 3.14USD 53,380SEC filing ↗
2022-09-19Rice William G.Purchase (P)Common Shares10,000USD 0.68USD 6,800SEC filing ↗
2022-09-19Payne FletcherPurchase (P)Common Shares10,000USD 0.68USD 6,800SEC filing ↗
2022-06-06Rice William G.Purchase (P)Common Shares10,000USD 0.97USD 9,700SEC filing ↗
2021-12-20BURGER DENIS RPurchase (P)Common Shares10,000USD 1.45USD 14,500SEC filing ↗
2021-12-16PLATZER ERICHPurchase (P)Common Shares100,000USD 1.38USD 137,900SEC filing ↗
2021-12-16Rice William G.Purchase (P)Common Shares13,183USD 1.52USD 20,038SEC filing ↗
2021-12-15PLATZER ERICHPurchase (P)Common Shares270,000USD 1.17USD 316,900SEC filing ↗
2021-12-15Rice William G.Purchase (P)Common Shares17,822USD 1.12USD 19,961SEC filing ↗
2021-11-26Rice William G.Purchase (P)Common Shares8,643USD 2.31USD 19,965SEC filing ↗
2021-11-19Bejar RafaelPurchase (P)Common Shares10,000USD 2.56USD 25,600SEC filing ↗
2021-08-03DRW Commodities, LLC; DRW Holdings, LLC; Wilson Donald R. Jr.Purchase (P)Common Stock57,199USD 2.65USD 151,577SEC filing ↗
2021-07-02Rice William G.Purchase (P)Common shares6,081USD 3.29USD 20,006SEC filing ↗
2020-03-25Rice William G.Purchase (P)Common Shares3,400USD 5.82USD 19,788SEC filing ↗

Form 4 evidence

9 transaction lines in the latest 365-day window; 61 in local history.

DateOwnerTypeSecuritySharesAvg. priceApprox. valueSource
2026-06-30Seizinger Bernd R.D (D)Common Shares17,000USD 1.72USD 29,240SEC filing ↗
2026-06-30Whitehead WarrenD (D)Common Shares33USD 1.72USD 57SEC filing ↗
2026-06-30Rice William G.D (D)Common Shares613,252USD 1.72USD 1,054,793SEC filing ↗
Show recent Form 4 evidence (8 grouped rows)
DateOwnerTypeSecuritySharesAvg. priceApprox. valueSource
2026-06-30Seizinger Bernd R.D (D)Common Shares17,000USD 1.72USD 29,240SEC filing ↗
2026-06-30Whitehead WarrenD (D)Common Shares33USD 1.72USD 57SEC filing ↗
2026-06-30Rice William G.D (D)Common Shares613,252USD 1.72USD 1,054,793SEC filing ↗
2026-06-30Payne FletcherD (D)Common Shares244USD 1.72USD 420SEC filing ↗
2026-06-30PLATZER ERICHD (D)Common Shares1,122USD 1.72USD 1,930SEC filing ↗
2026-06-30Bejar RafaelD (D)Common Shares244USD 1.72USD 420SEC filing ↗
2026-06-30BURGER DENIS RD (D)Common Shares70USD 1.72USD 120SEC filing ↗
2026-06-13Vincent Mark D.D (D)Common Shares14USD 1.72USD 24SEC 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 · —
TickerAPTO
CIK0000882361
SectorHealthcare
Industry— Yahoo Finance
SEC SIC2836 Biological Products, (No Diagnostic Substances)
Exchange—

Data coverage

Local Form 4 history61 transaction lines from 2020-03-10 to 2026-06-30
20 P purchase lines · 13 S sale lines · 28 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.