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

MARTIN MARIETTA MATERIALS INC

MLM · NYSE · CIK 0000916076 · Basic Materials · Building Materials

INSIDER SIGNAL

No active buy signal

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

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

Last qualifying purchase2025-03-04 · Petro Michael J · $249.9K

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.

Purchase breadth, concentration & cluster buying

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

Insider activity timeline

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

AprMayJunJulAugSepOct
WAJSGRAS DAVID CDirector
○○○
Pike ThomasDirector
○○○
LYONS MARTIN JDirector
○○○
Petro Michael JSVP and CFO
○○
SLAGER DONALD WDirector
○
PEREZ LAREE EDirector
○
● Purchase▼ Sale○ Other

Showing the six most active owners; 6 additional owner(s) remain in Form 4 evidence.

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: 2025-03-04 · Petro Michael J.

Recent Form 4 activity

0Purchases
0Sales
60Other Form 4 lines
49SEC filings · 365 days
BUYING0 qualifying P line(s) · 180 days
SELLING0 sale line(s) · context only
OTHER19 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
3,187,868
Previous report
2,906,618
Avg daily volume
966,156
Days to cover
3.3

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
2025-03-04Petro Michael JPurchase (P)Common Stock550USD 454.37USD 249,904SEC filing ↗
2020-05-13KORALESKI JOHN JPurchase (P)Common Stock1,000USD 164.08USD 164,080SEC filing ↗
2020-05-06KORALESKI JOHN JPurchase (P)Common Stock1,000USD 183.54USD 183,540SEC filing ↗
2020-03-31ZELNAK STEPHEN P JRPurchase (P)Common Stock8USD 177.24USD 1,459SEC filing ↗

Form 4 evidence

60 transaction lines in the latest 365-day window; 500 in local history.

DateOwnerTypeSecuritySharesAvg. priceApprox. valueSource
2026-09-01Petro Michael JAward / grant (A)Common Stock9,331USD 0.00USD 0SEC filing ↗
2026-08-31WAJSGRAS DAVID CAward / grant (A)Common Stock78USD 518.70USD 40,459SEC filing ↗
2026-08-31Pike ThomasAward / grant (A)Common Stock66USD 518.70USD 34,234SEC filing ↗
Show recent Form 4 evidence (30 grouped rows)
DateOwnerTypeSecuritySharesAvg. priceApprox. valueSource
2026-09-01Petro Michael JAward / grant (A)Common Stock9,331USD 0.00USD 0SEC filing ↗
2026-08-31WAJSGRAS DAVID CAward / grant (A)Common Stock78USD 518.70USD 40,459SEC filing ↗
2026-08-31Pike ThomasAward / grant (A)Common Stock66USD 518.70USD 34,234SEC filing ↗
2026-08-31LYONS MARTIN JAward / grant (A)Common Stock68USD 518.70USD 35,272SEC filing ↗
2026-08-21Niemann PhilippAward / grant (A)Common Stock337USD 0.00USD 0SEC filing ↗
2026-08-03Petro Michael JTax withholding (F)Common Stock368USD 542.27USD 199,555SEC filing ↗
2026-05-29WAJSGRAS DAVID CAward / grant (A)Common Stock69USD 581.64USD 40,133SEC filing ↗
2026-05-29Pike ThomasAward / grant (A)Common Stock59USD 581.64USD 34,317SEC filing ↗
2026-05-29LYONS MARTIN JAward / grant (A)Common Stock61USD 581.64USD 35,480SEC filing ↗
2026-05-14WAJSGRAS DAVID CAward / grant (A)Common Stock313USD 0.00USD 0SEC filing ↗
2026-05-14SLAGER DONALD WAward / grant (A)Common Stock313USD 0.00USD 0SEC filing ↗
2026-05-14Pike ThomasAward / grant (A)Common Stock313USD 0.00USD 0SEC filing ↗
2026-05-14PEREZ LAREE EAward / grant (A)Common Stock313USD 0.00USD 0SEC filing ↗
2026-05-14Mack Mary TAward / grant (A)Common Stock313USD 0.00USD 0SEC filing ↗
2026-05-14LYONS MARTIN JAward / grant (A)Common Stock313USD 0.00USD 0SEC filing ↗
2026-05-14Foxx Anthony RAward / grant (A)Common Stock313USD 0.00USD 0SEC filing ↗
2026-05-14DELLY GAYLA JAward / grant (A)Common Stock313USD 0.00USD 0SEC filing ↗
2026-05-14Ables Dorothy MAward / grant (A)Common Stock313USD 0.00USD 0SEC filing ↗
2026-05-01Samborski Christopher WilliamAward / grant (A)Common Stock8,101USD 0.00USD 0SEC filing ↗
2026-03-01Schoen George FrederickAward / grant (A)Common Stock23,673USD 0.00USD 0SEC filing ↗
2026-03-01Petro Michael JAward / grant (A)Common Stock2,960USD 0.00USD 0SEC filing ↗
2026-03-01Nye C HowardAward / grant (A)Common Stock5,919USD 0.00USD 0SEC filing ↗
2026-03-01McCunniff Donald A.Award / grant (A)Common Stock2,960USD 0.00USD 0SEC filing ↗
2026-02-27WAJSGRAS DAVID CAward / grant (A)Common Stock56USD 676.57USD 37,888SEC filing ↗
2026-02-27Pike ThomasAward / grant (A)Common Stock47USD 676.57USD 31,799SEC filing ↗
2026-02-27KORALESKI JOHN JAward / grant (A)Common Stock69USD 676.57USD 46,683SEC filing ↗
2026-02-24Petro Michael JTax withholding (F)Common Stock94USD 696.85USD 65,504SEC filing ↗
2026-02-24Nye C HowardTax withholding (F)Common Stock1,221USD 696.85USD 850,854SEC filing ↗
2026-02-24Flynn Jason PaulTax withholding (F)Common Stock30USD 696.85USD 20,906SEC filing ↗
2026-02-24Cardin Robert JTax withholding (F)Common Stock103USD 696.85USD 71,776SEC 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 · —
TickerMLM
CIK0000916076
SectorBasic Materials
IndustryBuilding Materials Yahoo Finance
SEC SIC1400 Mining & Quarrying of Nonmetallic Minerals (No Fuels)
ExchangeNYSE

Data coverage

Local Form 4 history500 transaction lines from 2020-01-02 to 2026-09-01
4 P purchase lines · 21 S sale lines · 475 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.