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CTSO — structural market context

Cytosorbents 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 23. Each line shows the earlier value, the later value and their dates.

Price

Close $5.27 (Oct 23) vs $6.01 (Oct 22): −12.31%.

Volume

0.67× its 20-session average (65K) on Oct 23.

Includes pre- and post-market trading.

Short interest

Short interest 124K shares (settlement Sep 30) vs 121K (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): 5 days with fails, largest 751 shares on Sep 15.

Previous file (settlements Sep 1–Sep 14, published Sep 30): 5 days with fails, largest 5K shares on Sep 14.

No new publication in this window.

Analyst rating actions

None recorded in this window.

Insider filings (Form 4)

None recorded in this window.

CTSO events and their magnitude

Latest SEC filing in the event study

8-K 7.01 · Regulation FD disclosure · filed 2026-09-23 · View on sec.gov ↗

…

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CTSO short interest & days to cover

SHARES SHORT
124K
% OF FLOAT
4.6%
DAYS TO COVER
12.0
CHANGE VS PRIOR
+2.7%

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 (25d ago)

CTSO fails-to-deliver (FTD)

Settlement dateFailed sharesPrice
2026-09-25 · 30d7$4.35
2026-09-24 · 31d185$5.02
2026-09-17 · 38d96$5.73

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

CTSO insider buying and selling (Form 4)

Last 12 months, Form 4 codes P and S: 7 purchases · 0 sales

InsiderTypeSharesValueFiled
Sobel Alan D. · directorPurchase (P)2K$12K2026-09-16
Sobel Alan D. · directorPurchase (P)100$6012026-09-16
Sobel Alan D. · directorPurchase (P)500$3K2026-09-16
Capponi Vincent · officer: President and COOPurchase (P)2K$11K2026-09-16
Chan Phillip P. · director, officer: Chief Executive OfficerPurchase (P)4K$23K2026-09-16

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.

CTSO analyst ratings

FirmActionRatingPublished
WBB SecuritiesinitialiseSpeculative Buy2026-10-21

Rating actions as published by the firms, from public feeds. They are not graded here.

Frequently asked questions

What is CTSO's short interest?
As of the FINRA settlement date 2026-09-30, CTSO had 124K shares sold short — 4.6% of its float, with 12.0 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 CTSO?
In the last 12 months of SEC Form 4 filings, CTSO recorded 7 insider purchases and 0 sales reported on Form 4 (transaction codes P and S; grants and option exercises excluded). These are attributed public records — information, not instruction.
What do analysts say about CTSO?
The most recent action: WBB Securities initialise to Speculative Buy on 2026-10-21. Rating actions are shown as published by the firms; they are not graded here.
Is this page telling me to buy or sell CTSO?
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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CTSO: 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.