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

COLUMBIA BANKING SYSTEM, INC.

COLB · Nasdaq · CIK 0000887343 · Financial Services · Banks—Regional

INSIDER SIGNAL

No active buy signal

1 qualifying P purchase group
in the current 180-day scoring window

17 Form 4 transaction lines observed in the same window
2 sales · 14 option, withholding, award, gift or other lines

Last qualifying purchase2026-06-30 · Deer Aaron James · $22.5K

WHY NO ACTIVE SIGNAL?

Purchase activityPresent
Recent buying1 qualifying line group(s)
Recent salesLow
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
Giem JudiEVP CHRO
○○
Moore Devine DavidEVP Chief Marketing Officer
▼
Varnado AnddriaDirector
○
Terry Hilliard C. IIIDirector
○
STUDENMUND JAYNIE MDirector
○
SEATON ELIZABETH WHITEHEADDirector
○
● Purchase▼ Sale○ Other

Showing the six most active owners; 9 additional owner(s) remain in Form 4 evidence.

Purchase breadth & concentration

QUALIFYING BUYERS1
PURCHASE CONCENTRATION100%Largest buyer: Deer Aaron James · $22.5K
CLUSTER BUYING · 15D1 insiderPeak activity: 2026-06-30–2026-06-30

Roles in the peak window: EVP Chief Strategy/Innov Offcr. Concentration uses priced qualifying P lines only and does not change the saved score.

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: 2026-06-30 · Deer Aaron James.

Recent Form 4 activity

1Purchases
7Sales
94Other Form 4 lines
67SEC filings · 365 days
BUYING1 qualifying P line(s) · 180 days
SELLING2 sale line(s) · context only
OTHER14 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
11,055,591
Previous report
10,555,238
Avg daily volume
2,840,750
Days to cover
3.9

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
2026-06-30Deer Aaron JamesPurchase (P)Common Stock886USD 25.37USD 22,478SEC filing ↗
2024-02-06SEATON ELIZABETH WHITEHEADPurchase (P)Common Stock2,685USD 18.48USD 49,619SEC filing ↗
2024-02-01Lund Randal LeePurchase (P)Common Stock1,000USD 19.29USD 19,290SEC filing ↗
2024-02-01Deer Aaron JamesPurchase (P)Common Stock2,000USD 19.32USD 38,640SEC filing ↗
2024-01-31Nixon Torran BPurchase (P)Common Stock3,650USD 20.49USD 74,788SEC filing ↗
2024-01-31MACHUCA LUISPurchase (P)Common Stock4,889USD 20.58USD 100,616SEC filing ↗
2024-01-30Merrywell ChristopherPurchase (P)Common Stock5,000USD 21.09USD 105,450SEC filing ↗
2024-01-30EERKES CRAIG DPurchase (P)Common Stock2,141USD 20.82USD 44,584SEC filing ↗
2024-01-30Stein ClintPurchase (P)Common Stock9,500USD 20.96USD 199,120SEC filing ↗
2024-01-30Numata S Mae FujitaPurchase (P)Common Stock1,000USD 21.09USD 21,090SEC filing ↗
2024-01-30Numata S Mae FujitaPurchase (P)Common400USD 21.09USD 8,436SEC filing ↗
2024-01-30Finkelstein Mark APurchase (P)Common Stock3,592USD 20.87USD 74,965SEC filing ↗
2024-01-29SCHULTZ JOHN FPurchase (P)Common Stock8,559USD 20.40USD 174,604SEC filing ↗
2024-01-29Forrest EricPurchase (P)Common Stock4,750USD 20.89USD 99,228SEC filing ↗
2024-01-29FARNSWORTH RON LPurchase (P)Common Stock2,500USD 20.71USD 51,775SEC filing ↗

Form 4 evidence

102 transaction lines in the latest 365-day window; 709 in local history.

DateOwnerTypeSecuritySharesAvg. priceApprox. valueSource
2026-09-04GARDNER STEVEN RAward / grant (A)Common Stock2,577USD 0.00USD 0SEC filing ↗
2026-09-02LAGOMARSINO SIMONEAward / grant (A)Common Stock2,670USD 0.00USD 0SEC filing ↗
2026-08-14Giem JudiOption exercise / conversion (M)Common Stock2,393USD 32.69USD 78,227SEC filing ↗
Show recent Form 4 evidence (30 grouped rows)
DateOwnerTypeSecuritySharesAvg. priceApprox. valueSource
2026-09-04GARDNER STEVEN RAward / grant (A)Common Stock2,577USD 0.00USD 0SEC filing ↗
2026-09-02LAGOMARSINO SIMONEAward / grant (A)Common Stock2,670USD 0.00USD 0SEC filing ↗
2026-08-14Giem JudiOption exercise / conversion (M)Common Stock2,393USD 32.69USD 78,227SEC filing ↗
2026-08-14Giem JudiTax withholding (F)Common Stock643USD 32.69USD 21,020SEC filing ↗
2026-06-30Deer Aaron JamesPurchase (P)Common Stock886USD 25.37USD 22,478SEC filing ↗
2026-06-08Moore Devine DavidSale (S)Common Stock3,872USD 29.78USD 115,308SEC filing ↗
2026-05-14Varnado AnddriaAward / grant (A)Common Stock3,949USD 0.00USD 0SEC filing ↗
2026-05-14Terry Hilliard C. IIIAward / grant (A)Common Stock3,949USD 0.00USD 0SEC filing ↗
2026-05-14STUDENMUND JAYNIE MAward / grant (A)Common Stock3,949USD 0.00USD 0SEC filing ↗
2026-05-14SEATON ELIZABETH WHITEHEADAward / grant (A)Common Stock3,949USD 0.00USD 0SEC filing ↗
2026-05-14SCHULTZ JOHN FAward / grant (A)Common Stock3,949USD 0.00USD 0SEC filing ↗
2026-05-14MITCHELL M CHRISTIANAward / grant (A)Common Stock3,949USD 0.00USD 0SEC filing ↗
2026-05-14MACHUCA LUISAward / grant (A)Common Stock3,949USD 0.00USD 0SEC filing ↗
2026-05-14Lund Randal LeeAward / grant (A)Common Stock3,949USD 0.00USD 0SEC filing ↗
2026-05-14Forrest EricAward / grant (A)Common Stock3,949USD 0.00USD 0SEC filing ↗
2026-05-14Finkelstein Mark AAward / grant (A)Common Stock3,949USD 0.00USD 0SEC filing ↗
2026-04-15Lakely BrockTax withholding (F)Common Stock396USD 29.10USD 11,524SEC filing ↗
2026-03-13Lakely BrockTax withholding (F)Common Stock211USD 26.23USD 5,535SEC filing ↗
2026-03-13BARUFFI KUMI YAMAMOTOTax withholding (F)Common Stock937USD 26.23USD 24,578SEC filing ↗
2026-03-13Stein ClintOption exercise / conversion (M)Common Stock18,171USD 26.23USD 476,625SEC filing ↗
2026-03-13Stein ClintTax withholding (F)Common Stock7,151USD 26.23USD 187,571SEC filing ↗
2026-03-13OGNALL ANDREW HOption exercise / conversion (M)Common Stock2,381USD 26.23USD 62,454SEC filing ↗
2026-03-13OGNALL ANDREW HTax withholding (F)Common Stock951USD 26.23USD 24,945SEC filing ↗
2026-03-13Nixon Torran BOption exercise / conversion (M)Common Stock5,013USD 26.23USD 131,491SEC filing ↗
2026-03-13Nixon Torran BTax withholding (F)Common Stock2,002USD 26.23USD 52,512SEC filing ↗
2026-03-13Namdar FrankOption exercise / conversion (M)Common Stock2,820USD 26.23USD 73,969SEC filing ↗
2026-03-13Namdar FrankTax withholding (F)Common Stock1,367USD 26.23USD 35,856SEC filing ↗
2026-03-13Moore Devine DavidOption exercise / conversion (M)Common Stock940USD 26.23USD 24,656SEC filing ↗
2026-03-13Moore Devine DavidTax withholding (F)Common Stock376USD 26.23USD 9,862SEC filing ↗
2026-03-13Merrywell ChristopherOption exercise / conversion (M)Common Stock5,013USD 26.23USD 131,491SEC 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 · —
TickerCOLB
CIK0000887343
SectorFinancial Services
IndustryBanks—Regional Yahoo Finance
SEC SIC6022 State Commercial Banks
ExchangeNasdaq

Data coverage

Local Form 4 history709 transaction lines from 2020-01-03 to 2026-09-04
63 P purchase lines · 9 S sale lines · 637 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.