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

Atmus Filtration Technologies Inc.

ATMU · NYSE · CIK 0001921963 · Consumer Cyclical · Auto Parts

INSIDER SIGNAL

No active buy signal

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

17 Form 4 transaction lines observed in the same window
5 sales · 8 option, withholding, award, gift or other lines

Last qualifying purchase2026-08-12 · Macadam Stephen E. · $99.6K

WHY NO ACTIVE SIGNAL?

Purchase activityPresent
Recent buying2 qualifying line group(s)
Recent salesModerate
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
Swan ReneeChief People Officer
▼▼
Macadam Stephen E.Director
○●
HAGGERTY GRETCHEN RDirector
○●
Masters CharlesSenior Vice President
▼
Kienzler JackChief Financial Officer
▼
Disher StephanieChief Executive Officer
▼
● Purchase▼ Sale○ Other

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

Purchase breadth & concentration

QUALIFYING BUYERS2
PURCHASE CONCENTRATION52%Largest buyer: HAGGERTY GRETCHEN R · $110.0K
CLUSTER BUYING · 15D1 insiderPeak activity: 2026-05-12–2026-05-12

Roles in the peak window: Director. 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: 2026-08-12 · Macadam Stephen E..

Recent Form 4 activity

4Purchases
6Sales
27Other Form 4 lines
29SEC filings · 365 days
BUYING4 qualifying P line(s) · 180 days
SELLING5 sale line(s) · context only
OTHER8 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 provides additional background on recent price performance and risk. It does not affect the Insider Signal.

Price performance

1M
-5.7%
3M
-16.5%
6M
-32.3%
12M
-4.5%

Volatility & liquidity

Volatility
36.2%
Beta
—
Avg daily value
USD 29.6M

Valuation

Market cap
USD 3.5B
P/E
16.8×

Fundamentals

Profit margin
11.8%
ROE
54.8%
Industry
Auto Parts

Market data

Price data up to: 2026-10-09 · Price source: OpenBB/yfinance; volume from price cache (yfinance) · From SEC filings: Market cap, P/E, Profit margin, ROE · Fiscal year ended: 2025-12-31 · Market cap is the shares outstanding stated on the filing cover multiplied by the latest close. Share count date: 2026-07-31 · Status: PASS

Short interest

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

Shares short
3,400,405
Previous report
3,087,685
Avg daily volume
903,225
Days to cover
3.8

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
2026-08-12Macadam Stephen E.Purchase (P)Common Stock2,000USD 49.78USD 99,560SEC filing ↗
2026-05-12HAGGERTY GRETCHEN RPurchase (P)Common Stock1,973USD 55.74USD 109,992SEC filing ↗
2025-09-05Donoso DiegoPurchase (P)Common Stock15USD 45.81USD 687SEC filing ↗
2025-08-13Donoso DiegoPurchase (P)Common Stock25USD 45.00USD 1,125SEC filing ↗
2024-08-23HAGGERTY GRETCHEN RPurchase (P)Common Stock5,849USD 34.20USD 200,029SEC filing ↗
2024-08-07Macadam Stephen E.Purchase (P)Common Stock8,250USD 31.56USD 260,370SEC filing ↗
2023-11-09Macadam Stephen E.Purchase (P)Common Stock5,200USD 19.49USD 101,348SEC filing ↗
2023-05-26Macadam Stephen E.Purchase (P)Common Stock4,600USD 21.75USD 100,050SEC filing ↗

Form 4 evidence

37 transaction lines in the latest 365-day window; 125 in local history.

DateOwnerTypeSecuritySharesAvg. priceApprox. valueSource
2026-08-17Swan ReneeSale (S)Common Stock3,870USD 50.89USD 196,944SEC filing ↗
2026-08-12Macadam Stephen E.Purchase (P)Common Stock2,000USD 49.78USD 99,560SEC filing ↗
2026-06-01Swan ReneeSale (S)Common Stock2,566USD 45.25USD 116,112SEC filing ↗
Show recent Form 4 evidence (30 grouped rows)
DateOwnerTypeSecuritySharesAvg. priceApprox. valueSource
2026-08-17Swan ReneeSale (S)Common Stock3,870USD 50.89USD 196,944SEC filing ↗
2026-08-12Macadam Stephen E.Purchase (P)Common Stock2,000USD 49.78USD 99,560SEC filing ↗
2026-06-01Swan ReneeSale (S)Common Stock2,566USD 45.25USD 116,112SEC filing ↗
2026-06-01Masters CharlesSale (S)Common Stock2,890USD 45.25USD 130,772SEC filing ↗
2026-06-01Kienzler JackSale (S)Common Stock5,132USD 45.25USD 232,223SEC filing ↗
2026-06-01Disher StephanieSale (S)Common Stock25,652USD 45.25USD 1,160,753SEC filing ↗
2026-05-12TAYLOR STUART A IIAward / grant (A)Common Stock2,619USD 0.00USD 0SEC filing ↗
2026-05-12Sharp HeathAward / grant (A)Common Stock2,619USD 0.00USD 0SEC filing ↗
2026-05-12Macadam Stephen E.Award / grant (A)Common Stock2,619USD 0.00USD 0SEC filing ↗
2026-05-12Leipold Jane AAward / grant (A)Common Stock2,619USD 0.00USD 0SEC filing ↗
2026-05-12HAGGERTY GRETCHEN RPurchase (P)Common Stock1,973USD 55.74USD 109,992SEC filing ↗
2026-05-12HAGGERTY GRETCHEN RAward / grant (A)Common Stock2,619USD 0.00USD 0SEC filing ↗
2026-05-12Donoso DiegoAward / grant (A)Common Stock2,619USD 0.00USD 0SEC filing ↗
2026-05-12Carpenter Kevin NAward / grant (A)Common Stock28,509USD 0.00USD 0SEC filing ↗
2026-05-12Bennett Roy EdwinAward / grant (A)Common Stock2,619USD 0.00USD 0SEC filing ↗
2026-04-01Swan ReneeAward / grant (A)Common Stock1,962USD 0.00USD 0SEC filing ↗
2026-04-01Masters CharlesAward / grant (A)Common Stock4,130USD 0.00USD 0SEC filing ↗
2026-04-01Kienzler JackAward / grant (A)Common Stock5,163USD 0.00USD 0SEC filing ↗
2026-04-01Heltebran LauraAward / grant (A)Common Stock3,717USD 0.00USD 0SEC filing ↗
2026-04-01Disher StephanieAward / grant (A)Common Stock31,492USD 0.00USD 0SEC filing ↗
2026-02-27Swan ReneeTax withholding (F)Common Stock11,824USD 64.53USD 763,003SEC filing ↗
2026-02-27Masters CharlesTax withholding (F)Common Stock11,177USD 64.53USD 721,252SEC filing ↗
2026-02-27Kienzler JackTax withholding (F)Common Stock20,117USD 64.53USD 1,298,150SEC filing ↗
2026-02-27Disher StephanieTax withholding (F)Common Stock82,493USD 64.53USD 5,323,273SEC filing ↗
2026-02-13Swan ReneeAward / grant (A)Common Stock18,536USD 0.00USD 0SEC filing ↗
2026-02-13Masters CharlesAward / grant (A)Common Stock21,152USD 0.00USD 0SEC filing ↗
2026-02-13Kienzler JackAward / grant (A)Common Stock41,094USD 0.00USD 0SEC filing ↗
2026-02-13Disher StephanieAward / grant (A)Common Stock169,209USD 0.00USD 0SEC filing ↗
2026-02-05Sharp HeathAward / grant (A)Common Stock614USD 0.00USD 0SEC filing ↗
2025-11-18Donoso DiegoJ (J)Common Stock20USD 0.00USD 0SEC 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 · —
TickerATMU
CIK0001921963
SectorConsumer Cyclical
IndustryAuto Parts Yahoo Finance
SEC SIC3714 Motor Vehicle Parts & Accessories
ExchangeNYSE

Data coverage

Local Form 4 history125 transaction lines from 2023-05-26 to 2026-08-17
10 P purchase lines · 8 S sale lines · 107 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.