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ATMU — structural market context

Atmus Filtration Technologies

Structural market context from public regulatory and market data, shown with its as-of dates. Descriptive only: nothing on this page is a recommendation, a prediction, or advice to buy or sell any security.

What changed

As of the close on Oct 21. Each line shows the earlier value, the later value and their dates.

Price

Close $45.08 (Oct 21) vs $44.75 (Oct 20): +0.74%.

Volume

0.62× its 20-session average (682K) on Oct 21.

Includes pre- and post-market trading.

Short interest

Short interest 3.4M shares (settlement Sep 30) vs 3.1M (Sep 15).

No new publication in this window. Latest: settlement Sep 30, published Oct 10.

Fails-to-deliver

Latest file (settlements Sep 15–Sep 30, published Oct 16): 2 days with fails, largest 2K shares on Sep 22.

Previous file (settlements Sep 1–Sep 14, published Sep 30): 1 day with fails, largest 555 shares on Sep 3.

No new publication in this window.

Insider filings (Form 4)

None recorded in this window.

ATMU short interest & days to cover

SHARES SHORT
3.4M
% OF FLOAT
4.2%
DAYS TO COVER
3.8
CHANGE VS PRIOR
+10.1%

FINRA consolidated short interest, reported twice a month and published ~2 weeks after each settlement date. % of float uses reported free float. · as of 2026-09-30 (22d ago)

ATMU fails-to-deliver (FTD)

Settlement dateFailed sharesPrice
2026-09-30 · 22d51$43.94
2026-09-22 · 30d2K$44.59
2026-09-03 · 49d555$47.29

SEC fails-to-deliver files, published twice a month with ~6 weeks of delay.

ATMU insider buying and selling (Form 4)

Last 12 months, Form 4 codes P and S: 0 purchases · 1 sale

InsiderTypeSharesValueFiled
Swan Renee · officer: Chief People OfficerSale (S)4K$197K2026-08-18

SEC Form 4 filings: purchases and sales reported on Form 4 (transaction codes P and S) only; grants and option exercises excluded. Attributed public records.

Frequently asked questions

What is ATMU's short interest?
As of the FINRA settlement date 2026-09-30, ATMU had 3.4M shares sold short — 4.2% of its float, with 3.8 days to cover at average volume. FINRA publishes this data roughly two weeks after each twice-monthly settlement, so it is inherently delayed. A short-interest figure describes an aggregate position; it does not predict what the stock will do.
Are insiders buying ATMU?
In the last 12 months of SEC Form 4 filings, ATMU recorded 0 insider purchases and 1 sale reported on Form 4 (transaction codes P and S; grants and option exercises excluded). These are attributed public records — information, not instruction.
Is this page telling me to buy or sell ATMU?
No. Everything on this page is descriptive, structural market context from public data, shown with its as-of dates. TradeAI News does not issue directional recommendations, price predictions, or buy/sell advice — for any ticker.
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ATMU: the full history

Latest rows shown. Full history, market-wide screens, cluster detection and the context journal live in the dashboard.

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Not financial advice. Trading involves risk. Descriptive structural context, never a recommendation.