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CERS — structural market context

Cerus Corporation

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 $2.39 (Oct 21) vs $2.31 (Oct 20): +3.46%.

Volume

1.03× its 20-session average (1.8M) on Oct 21.

Includes pre- and post-market trading.

Short interest

Short interest 17.6M shares (settlement Sep 30) vs 18.0M (Sep 15).

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

Insider filings (Form 4)

None recorded in this window.

CERS events and their magnitude

Latest SEC filing in the event study

Form 4 · sale · filed 2026-08-17 · View on sec.gov ↗

…

Open the Event Study →

CERS short interest & days to cover

SHARES SHORT
17.6M
% OF FLOAT
9.2%
DAYS TO COVER
8.0
CHANGE VS PRIOR
-2.3%

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)

CERS fails-to-deliver (FTD)

Settlement dateFailed sharesPrice
2026-08-26 · 57d541$2.72
2026-08-24 · 59d3K$2.81
2026-08-21 · 62d227$2.79

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

CERS insider buying and selling (Form 4)

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

InsiderTypeSharesValueFiled
Jensen Chrystal · officer: Chief Legal OfficerSale (S)30K$90K2026-08-17

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 CERS's short interest?
As of the FINRA settlement date 2026-09-30, CERS had 17.6M shares sold short — 9.2% of its float, with 8.0 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 CERS?
In the last 12 months of SEC Form 4 filings, CERS 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 CERS?
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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CERS: 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.