CTSO
Cytosorbents Corp
Cytosorbents Corp insider trading
Insiders at Cytosorbents Corp have been buying its stock on the open market. The largest purchase in the last 30 days was Chan Phillip P. (Chief Executive Officer · Director) buying $70K of CTSO, filed Sep 09, 2026. Every open-market purchase and sale its officers, directors and 10% owners filed in that time is listed below, each linked to the original Form 4.
- Bought on the open market
- $70K
- Sold
- —
- Insiders
- 1
- Latest trade
- Sep 04, 2026
From SEC filings · last 30 days
Recent CTSO insider transactions
Chan Phillip P.Chief Executive Officer · Director
Bought 200,000 sh at $0.35 · Sep 04, 2026
$70K
Filing
SEC Form 4 data, Q3 2024 to Q2 2026
CTSO insider trading by quarter
Between Jul 01, 2024 and Jun 30, 2026, 2 insiders traded CTSO on the open market: 6 purchases worth $196K and 0 sales. In the last four quarters alone: 3 purchases ($148.9K) and 0 sales, by 2 insiders.
| Quarter | Bought | Sold | Insiders |
|---|---|---|---|
| Q2 2026 | +$148.9K3 buys | — | |
| Q1 2026 | — | — | |
| Q4 2025 | — | — | |
| Q3 2025 | — | — | |
| Q2 2025 | — | — | |
| Q1 2025 | — | — | |
| Q4 2024 | +$47.1K3 buys | — | |
| Q3 2024 | — | — |
- Largest purchase
- +$100.5K of CTSO by Chan Phillip P. (Chief Executive Officer · Director) on Jun 12, 2026.
Open-market transactions through Jun 30, 2026most recent first
Mariani Peter J
Chief Financial Officer
+$44K
Jun 15, 2026
100,000 sh · $0.44
Chan Phillip P.
Chief Executive Officer · Director
+$4.4K
Jun 15, 2026
10,333 sh · $0.43
Chan Phillip P.
Chief Executive Officer · Director
+$100.5K
Jun 12, 2026
251,135 sh · $0.40
Mariani Peter J
Chief Financial Officer
+$19.2K
Dec 13, 2024
20,000 sh · $0.96
Mariani Peter J
Chief Financial Officer
+$17.8K
Dec 12, 2024
20,000 sh · $0.89
Mariani Peter J
Chief Financial Officer
+$10.1K
Dec 11, 2024
11,363 sh · $0.89
| Date | Insider | Shares | Price | Value |
|---|---|---|---|---|
| Jun 15, 2026 | Mariani Peter JChief Financial Officer | 100,000 | $0.44 | +$44K |
| Jun 15, 2026 | Chan Phillip P.Chief Executive Officer · Director | 10,333 | $0.43 | +$4.4K |
| Jun 12, 2026 | Chan Phillip P.Chief Executive Officer · Director | 251,135 | $0.40 | +$100.5K |
| Dec 13, 2024 | Mariani Peter JChief Financial Officer | 20,000 | $0.96 | +$19.2K |
| Dec 12, 2024 | Mariani Peter JChief Financial Officer | 20,000 | $0.89 | +$17.8K |
| Dec 11, 2024 | Mariani Peter JChief Financial Officer | 11,363 | $0.89 | +$10.1K |
From SEC's quarterly Form 3, 4 and 5 data sets: code P purchases and code S sales of common stock, by the date the trade happened. Where a fund and the people who control it each report the same block, it is counted once. Trades made in the last days of Q2 2026 but filed after it closed arrive with SEC's next quarterly release.
Don't check CTSO — let it ping you
Watch every insider filing the minute it clears the SEC
The live dashboard reads every Form 4 as it lands and puts it in plain English — open-market buys, cluster buys where several insiders move at once, and the sales executives chose to make rather than scheduled. Free to open; Pro adds alerts, watchlists and each buyer's track record.
Cytosorbents Corp is outside the ~660 companies InsiderPulse scans continuously. This page is built from the filings on the live tape and stays up while its insiders are buying. Monitoring, not advice.
Other companies insiders are buying now
Questions
- Are CTSO insiders buying or selling?
- Between Sep 04, 2026 and Sep 04, 2026, 1 Cytosorbents Corp insider made 1 open-market purchase worth $70K and no sales, a net purchase of $70K.
- How much CTSO stock have insiders bought and sold in the last two years?
- Between Jul 01, 2024 and Jun 30, 2026, 2 Cytosorbents Corp insiders made 6 open-market purchases worth $196K and no sales. In the four quarters to Jun 30, 2026: 3 purchases ($148.9K) and no sales. The largest purchase was Chan Phillip P. buying $100.5K on Jun 12, 2026.
- What was the largest recent CTSO insider trade?
- Chan Phillip P. (Chief Executive Officer · Director) bought $70K of CTSO stock on Sep 04, 2026 at about $0.35 a share.
- When did an insider last buy CTSO shares?
- The most recent open-market purchase on file is Chan Phillip P. (Chief Executive Officer · Director) buying $70K on Sep 04, 2026.
- Where does CTSO insider trading data come from?
- From the Form 4 filings Cytosorbents Corp's officers, directors and 10% owners must send the SEC within two business days of a trade. Each row on this page links to its original filing on SEC EDGAR. Share grants and option exercises are kept apart from open-market purchases and sales, because only the latter cost the insider their own money.
Get the free Insider Brief
The week's real signals — open-market insider buys, cluster formations and what insiders did in CTSO and across the market — in plain English, with grants and routine vesting stripped out. Free, and honest about what the data can and cannot say.