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

Price

Close $4.11 (Oct 16) vs $3.06 (Oct 15): +34.31%.

Volume

59.19× its 20-session average (12K) on Oct 16.

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.

Insider filings (Form 4)

None recorded in this window.

CTSO short interest & days to cover

SHARES SHORT
124K
% OF FLOAT
—
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 (16d ago)

CTSO fails-to-deliver (FTD)

Settlement dateFailed sharesPrice
2026-09-25 · 21d7$4.35
2026-09-24 · 22d185$5.02
2026-09-17 · 29d96$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. · directorBuy (P)2K$12K2026-09-16
Sobel Alan D. · directorBuy (P)100$6012026-09-16
Sobel Alan D. · directorBuy (P)500$3K2026-09-16
Capponi Vincent · officer: President and COOBuy (P)2K$11K2026-09-16
Chan Phillip P. · director, officer: Chief Executive OfficerBuy (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.

Frequently asked questions

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