Stock Trading Canary

United States · SEC Form 4 · Snapshot date: 2026-10-18 · Built: 2026-10-18 · 中文

← United States · Coverage record

US · SEC FORM 4

Cytosorbents Corp

CTSO · Nasdaq · CIK 0001175151 · Healthcare · Medical Devices

INSIDER SIGNAL

68.5 / 100

4 buyers · 10 purchase transaction lines · $269.3K gross purchase

WHY THIS SIGNAL?

Buyer breadthStrong
Purchase sizeModerate
RoleModerate
RecencyModerate
ConvictionStrong
Score anatomy

Each bar shows the contribution to the current score; the weights and formula stay unchanged.

Cluster+28.0 / 35
Purchase size+11.8 / 25
Role+13.0 / 20
Recency+5.8 / 10
Conviction+10.0 / 10

What is holding the score back?

  • ⚠ Purchase size is modest relative to the model scale
  • ⚠ Role scores low · most senior buyer: Chief Executive Officer (CEO, chair and 10% owners score lowest)
  • ✓ Cluster breadth is broad · 4+ insiders

Purchase-size comments are relative to the model scale. Average daily volume is a separate market-context diagnostic.

US-v1.2 ranks qualifying equity purchases under the current 180-day rules. The score is a research priority, not a return forecast or probability. Backtests have not shown that a higher US score is followed by better returns.

Insider activity timeline

Owner lanes show the latest 180 days. Symbol shape identifies the transaction type; sales remain context only.

AprMayJunJulAugSepOct
Chan Phillip P.Chief Executive Officer
●●●●
MARIANI PETER JChief Financial Officer
●
Sobel Alan D.Director
●
Capponi VincentPresident and COO
●
● Purchase▼ Sale○ Other

—

Purchase breadth & concentration

QUALIFYING BUYERS4
PURCHASE CONCENTRATION73%Largest buyer: Chan Phillip P. · $197.5K
CLUSTER BUYING · 15D3 insidersPeak activity: 2026-09-04–2026-09-15

Roles in the peak window: Chief Executive Officer, Director, President and COO. Concentration uses priced qualifying P lines only and does not change the saved score.

SIGNAL HISTORY

68.5 / 100

Latest recorded score

↓ -0.3 ptsversus the previous recorded snapshot
  1. 69.2
  2. 69.0
  3. 68.9
  4. 68.8
  5. 68.5

Only scores saved when a full US scoring run completed are shown; gaps are not reconstructed.

Recent Form 4 activity

10Purchases
0Sales
1Other Form 4 lines
7SEC filings · 365 days
BUYING10 qualifying P line(s) · 180 days
SELLING0 sale line(s) · context only
OTHER0 exercise / withholding / award / gift / other lines
10b5-1 / PLANNEDNot assessed

P is an open-market or private purchase. S is a sale. M, F, A and G usually describe exercises, tax withholding, awards and gifts. These categories remain visually separate.

Market context

Market context provides additional background on recent price performance and risk. It does not affect the Insider Signal.

Price performance

1M
-40.5%
3M
-50.1%
6M
-68.9%
12M
-80.6%

Volatility & liquidity

Volatility
82.7%
Beta
—
Avg daily value
USD 46,743

Valuation

Market cap
—
P/E
—

Fundamentals

Profit margin
-22.1%
ROE
-138.9%
Industry
Medical Devices

Market data

Price data up to: 2026-10-11 · Price source: OpenBB/yfinance; volume from price cache (yfinance) · From SEC filings: Profit margin, ROE · Fiscal year ended: 2025-12-31 · Status: PASS

Short interest

Short interest is external context reported to FINRA by broker-dealers. It does not affect the Insider Signal.

Shares short
123,890
Previous report
120,606
Avg daily volume
10,339
Days to cover
12.0

FINRA settlement date: 2026-09-30 · Captured 2026-10-12 · FINRA equity short interest ↗. A share count, published about a week after each of two settlement dates a month; not a percentage of shares outstanding.

Historical equity purchases

Qualifying code P transactions in the local Form 4 history, including purchases outside the current signal window.

Transaction dateReporting ownerTypeSecuritySharesAvg. priceApprox. valueSource
2026-09-15Sobel Alan D.Purchase (P)Common Stock2,500USD 6.10USD 15,254SEC filing ↗
2026-09-15Chan Phillip P.Purchase (P)Common Stock3,774USD 6.00USD 22,644SEC filing ↗
2026-09-14Capponi VincentPurchase (P)Common Stock2,073USD 6.05USD 12,537SEC filing ↗
2026-09-04Chan Phillip P.Purchase (P)Common Stock200,000USD 0.35USD 70,000SEC filing ↗
2026-06-15MARIANI PETER JPurchase (P)Common Stock100,000USD 0.44USD 44,000SEC filing ↗
2026-06-15Chan Phillip P.Purchase (P)Common Stock10,333USD 0.43USD 4,443SEC filing ↗
2026-06-12Chan Phillip P.Purchase (P)Common Stock251,136USD 0.40USD 100,454SEC filing ↗
2024-12-13MARIANI PETER JPurchase (P)Common Stock20,000USD 0.96USD 19,200SEC filing ↗
2024-12-12MARIANI PETER JPurchase (P)Common Stock20,000USD 0.89USD 17,800SEC filing ↗
2024-12-11MARIANI PETER JPurchase (P)Common Stock11,363USD 0.89USD 10,113SEC filing ↗
2023-12-13Sobel Alan D.Purchase (P)Common Stock22,557USD 1.33USD 30,001SEC filing ↗
2023-12-13Kim JinyPurchase (P)Common Stock7,519USD 1.33USD 10,000SEC filing ↗
2023-12-13Jones Edward RaymondPurchase (P)Common Stock7,519USD 1.33USD 10,000SEC filing ↗
2023-12-13Deliargyris EfthymiosPurchase (P)Common Stock22,557USD 1.33USD 30,001SEC filing ↗
2023-12-13Chan Phillip P.Purchase (P)Common Stock75,188USD 1.33USD 100,000SEC filing ↗

Form 4 evidence

11 transaction lines in the latest 365-day window; 116 in local history.

DateOwnerTypeSecuritySharesAvg. priceApprox. valueSource
2026-09-15Sobel Alan D.Purchase (P)Common Stock2,500USD 6.10USD 15,254SEC filing ↗
2026-09-15Chan Phillip P.Purchase (P)Common Stock3,774USD 6.00USD 22,644SEC filing ↗
2026-09-14Capponi VincentPurchase (P)Common Stock2,073USD 6.05USD 12,537SEC filing ↗
Show recent Form 4 evidence (8 grouped rows)
DateOwnerTypeSecuritySharesAvg. priceApprox. valueSource
2026-09-15Sobel Alan D.Purchase (P)Common Stock2,500USD 6.10USD 15,254SEC filing ↗
2026-09-15Chan Phillip P.Purchase (P)Common Stock3,774USD 6.00USD 22,644SEC filing ↗
2026-09-14Capponi VincentPurchase (P)Common Stock2,073USD 6.05USD 12,537SEC filing ↗
2026-09-04Chan Phillip P.Purchase (P)Common Stock200,000USD 0.35USD 70,000SEC filing ↗
2026-06-15MARIANI PETER JPurchase (P)Common Stock100,000USD 0.44USD 44,000SEC filing ↗
2026-06-15Chan Phillip P.Purchase (P)Common Stock10,333USD 0.43USD 4,443SEC filing ↗
2026-06-12Chan Phillip P.Purchase (P)Common Stock251,136USD 0.40USD 100,454SEC filing ↗
2025-11-18Chan Phillip P.Award / grant (A)Common Stock100,000USD 0.64USD 64,000SEC filing ↗

Multiple price lines in one filing are grouped and share-weighted. Price and value are blank when a grouped filing line lacks price evidence.

Snapshot & identity

Snapshot date2026-10-18
Ranking versionUS-v1.2
Data qualityPASS ELIGIBLE · —
TickerCTSO
CIK0001175151
SectorHealthcare
IndustryMedical Devices Yahoo Finance
SEC SIC3841 Surgical & Medical Instruments & Apparatus
ExchangeNasdaq

Data coverage

Local Form 4 history116 transaction lines from 2020-02-28 to 2026-09-15
54 P purchase lines · 4 S sale lines · 58 other lines
SEC company submissionsOpen SEC filings ↗

Local ledger as of 2026-10-18. Mapping status is an audit field and does not erase SEC filing evidence.