Cytosorbents Corporation Insider Trading

CTSO

Cluster buy

3 insiders bought 120K of their own stock in 12 days.

Open-market purchases by executives and directors between Sep 4 and Sep 15. Buying is rarer than selling and says more, but it is one input, not a verdict.

Net open-market

+269K

6 buys · 0 sales

Under a 10b5-1 plan

—

no sales

Insiders who bought / sold

4 / 0

executives and directors

Last open-market buy

Sep 2026

Sep 15, 2026

Get an email when CTSO's executives or directors buy, or make a large sale outside a plan.

Trades · last 2 years

Date	Insider	Trade	Shares	Price	Value	Of their stake	Filing
Sep 15	Phillip P. Chan Chief Executive Officer	Bought	3,774	$6.00	23K	3.9%	Form 4
Sep 15	Alan D. Sobel Director	Bought 3 parts	2,500	$6.10 average	15K	34%	Form 4
Sep 14	Vincent Capponi President and COO	Bought 2 parts	2,073	$6.05 average	13K	5.4%	Form 4
Sep 4	Phillip P. Chan Chief Executive Officer	Bought	200,000	$0.35	70K	11%	Form 4
Jun 15	Peter J Mariani Chief Financial Officer	Bought	100,000	$0.44	44K	19%	Form 4
Jun 12 – 15	Phillip P. Chan Chief Executive Officer	Bought 2 parts	261,469	$0.40 average	105K	18%	Form 4
Dec 13, 2024	Peter J Mariani Chief Financial Officer	Bought	20,000	$0.96	19K	5.2%	Form 4
Dec 11, 2024 – Dec 12, 2024	Peter J Mariani Chief Financial Officer	Bought 2 parts	31,363	$0.89 average	28K	9.0%	Form 4

Sep 15
Phillip P. Chan
Chief Executive Officer · bought 3,774 at $6.00
23K
3.9% of stake
Sep 15
Alan D. Sobel
Director · bought 2,500 at avg $6.10
15K
34% of stake
Sep 14
Vincent Capponi
President and COO · bought 2,073 at avg $6.05
13K
5.4% of stake
Sep 4
Phillip P. Chan
Chief Executive Officer · bought 200,000 at $0.35
70K
11% of stake
Jun 15
Peter J Mariani
Chief Financial Officer · bought 100,000 at $0.44
44K
19% of stake
Jun 12 – 15
Phillip P. Chan
Chief Executive Officer · bought 261,469 at avg $0.40
105K
18% of stake
Dec 13, 2024
Peter J Mariani
Chief Financial Officer · bought 20,000 at $0.96
19K
5.2% of stake
Dec 11, 2024 – Dec 12, 2024
Peter J Mariani
Chief Financial Officer · bought 31,363 at avg $0.89
28K
9.0% of stake

How to read this. Insiders sell for many reasons: taxes, diversifying, a house. Open-market buys are rarer and say more. A 10b5-1 plan is a trading schedule set up months in advance, so those sales were not timed on news. Large holders (funds and 10% owners) are listed under Everything but not counted as insiders. If you own or watch CTSO, we send a push when an executive buys or makes a large sale outside a plan.

Source: SEC Form 4 filings, filed within two business days of each trade and checked for new ones every hour.

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Spot a number that looks wrong? Check it in CTSO's SEC filings or

Download this analysis as a PDF (Pro)

Data sourced from SEC EDGAR filings and third-party price providers. Scores, valuations, and metrics are algorithmic estimates. This is not investment advice. See our Terms and Methodology.

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