Stock Trading Canary

United States · SEC Form 4 · Snapshot date: 2026-10-19 · Built: 2026-10-19 · 中文

← United States · Coverage record

US · SEC FORM 4

Moleculin Biotech, Inc.

MBRX · Nasdaq · CIK 0001659617 · Healthcare · Biotechnology

INSIDER SIGNAL

No active buy signal

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

19 Form 4 transaction lines observed in the same window
0 sales · 16 option, withholding, award, gift or other lines

Last qualifying purchase2026-08-03 · Foster Jonathan P. · value unavailable

WHY NO ACTIVE SIGNAL?

Purchase activityPresent
Recent buying3 qualifying line group(s)
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.

Purchase breadth & concentration

QUALIFYING BUYERS3
PURCHASE CONCENTRATION—Largest buyer: Foster Jonathan P. · $0
CLUSTER BUYING · 15D3 insidersPeak activity: 2026-08-03–2026-08-03

Roles in the peak window: CEO and President, Chief Financial Officer, Chief Science Officer. Concentration uses priced qualifying P lines only and does not change the saved score.

Insider activity timeline

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

AprMayJunJulAugSepOct
KLEMP WALTER VCEO and President
○○○○●○○
Foster Jonathan P.Chief Financial Officer
○○○○●○○
PICKER DONALD HChief Science Officer
○○○○●
● Purchase▼ Sale○ Other

—

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: 2026-08-03 · Foster Jonathan P..

Recent Form 4 activity

3Purchases
0Sales
22Other Form 4 lines
11SEC filings · 365 days
BUYING3 qualifying P line(s) · 180 days
SELLING0 sale line(s) · context only
OTHER16 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
204,583
Previous report
287,608
Avg daily volume
1,712,392
Days to cover
≤ 1.0

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
2026-08-03PICKER DONALD HPurchase (P)Common Stock173,333USD —USD —SEC filing ↗
2026-08-03KLEMP WALTER VPurchase (P)Common Stock533,333USD —USD —SEC filing ↗
2026-08-03Foster Jonathan P.Purchase (P)Common Stock293,333USD —USD —SEC filing ↗
2025-06-23KLEMP WALTER VPurchase (P)Common Stock675,675USD 0.37USD 250,000SEC filing ↗
2025-06-23Foster Jonathan P.Purchase (P)Common Stock270,270USD 0.37USD 100,000SEC filing ↗
2023-12-26KLEMP WALTER VPurchase (P)Common Stock188,404USD 0.69USD 129,999SEC filing ↗
2023-12-26George Robert E.Purchase (P)Common Stock14,493USD 0.69USD 10,000SEC filing ↗
2023-12-26Foster Jonathan P.Purchase (P)Common Stock28,986USD 0.69USD 20,000SEC filing ↗
2022-11-25KLEMP WALTER VPurchase (P)Common Stock45,000USD 1.28USD 57,600SEC filing ↗
2022-11-21KLEMP WALTER VPurchase (P)Common Stock22,500USD 1.15USD 25,875SEC filing ↗
2022-11-17KLEMP WALTER VPurchase (P)Common Stock24,742USD 1.02USD 25,237SEC filing ↗
2022-11-16KLEMP WALTER VPurchase (P)Common Stock85,213USD 0.97USD 82,657SEC filing ↗

Form 4 evidence

25 transaction lines in the latest 365-day window; 100 in local history.

DateOwnerTypeSecuritySharesAvg. priceApprox. valueSource
2026-10-15KLEMP WALTER VOption exercise / conversion (M)Common Stock207,500USD —USD —SEC filing ↗
2026-10-15KLEMP WALTER VTax withholding (F)Common Stock48,659USD 0.37USD 18,009SEC filing ↗
2026-10-15Foster Jonathan P.Option exercise / conversion (M)Common Stock130,000USD —USD —SEC filing ↗
Show recent Form 4 evidence (24 grouped rows)
DateOwnerTypeSecuritySharesAvg. priceApprox. valueSource
2026-10-15KLEMP WALTER VOption exercise / conversion (M)Common Stock207,500USD —USD —SEC filing ↗
2026-10-15KLEMP WALTER VTax withholding (F)Common Stock48,659USD 0.37USD 18,009SEC filing ↗
2026-10-15Foster Jonathan P.Option exercise / conversion (M)Common Stock130,000USD —USD —SEC filing ↗
2026-10-15Foster Jonathan P.Tax withholding (F)Common Stock30,485USD 0.37USD 11,282SEC filing ↗
2026-08-03PICKER DONALD HPurchase (P)Common Stock173,333USD —USD —SEC filing ↗
2026-08-03KLEMP WALTER VPurchase (P)Common Stock533,333USD —USD —SEC filing ↗
2026-08-03Foster Jonathan P.Purchase (P)Common Stock293,333USD —USD —SEC filing ↗
2026-06-22PICKER DONALD HOption exercise / conversion (M)Common Stock71USD —USD —SEC filing ↗
2026-06-22PICKER DONALD HTax withholding (F)Common Stock21USD 3.12USD 66SEC filing ↗
2026-06-22KLEMP WALTER VOption exercise / conversion (M)Common Stock360USD —USD —SEC filing ↗
2026-06-22KLEMP WALTER VTax withholding (F)Common Stock88USD 3.12USD 275SEC filing ↗
2026-06-22Foster Jonathan P.Option exercise / conversion (M)Common Stock174USD —USD —SEC filing ↗
2026-06-22Foster Jonathan P.Tax withholding (F)Common Stock41USD 3.12USD 128SEC filing ↗
2026-06-20PICKER DONALD HOption exercise / conversion (M)Common Stock44USD —USD —SEC filing ↗
2026-06-20PICKER DONALD HTax withholding (F)Common Stock13USD 2.88USD 37SEC filing ↗
2026-06-20KLEMP WALTER VOption exercise / conversion (M)Common Stock150USD —USD —SEC filing ↗
2026-06-20KLEMP WALTER VTax withholding (F)Common Stock37USD 2.88USD 107SEC filing ↗
2026-06-20Foster Jonathan P.Option exercise / conversion (M)Common Stock109USD —USD —SEC filing ↗
2026-06-20Foster Jonathan P.Tax withholding (F)Common Stock31USD 2.88USD 89SEC filing ↗
2025-11-04PICKER DONALD HOption exercise / conversion (M)Common Stock8,750USD —USD —SEC filing ↗
2025-11-04PICKER DONALD HTax withholding (F)Common Stock2,131USD 0.50USD 1,066SEC filing ↗
2025-11-04KLEMP WALTER VOption exercise / conversion (M)Common Stock28,750USD —USD —SEC filing ↗
2025-11-04KLEMP WALTER VTax withholding (F)Common Stock7,001USD 0.50USD 3,500SEC filing ↗
2025-11-04Foster Jonathan P.Option exercise / conversion (M)Common Stock25,648USD —USD —SEC 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 date2026-10-19
Ranking versionUS-v1.2
Data qualityPASS ELIGIBLE · —
TickerMBRX
CIK0001659617
SectorHealthcare
IndustryBiotechnology Yahoo Finance
SEC SIC2834 Pharmaceutical Preparations
ExchangeNasdaq

Data coverage

Local Form 4 history100 transaction lines from 2020-07-13 to 2026-10-15
12 P purchase lines · 0 S sale lines · 88 other lines
SEC company submissionsOpen SEC filings ↗

Local ledger as of 2026-10-19. Mapping status is an audit field and does not erase SEC filing evidence.