C3is Inc. (CISS)
CISS moved a median of -1.34% 30 minutes after news, and -1.85% by the close. How CISS actually reacts to news — the realized, point-in-time move the market made, measured across 290 labeled events over the last three years with zero look-ahead.
CISS’s median reaction, across the day.
| Horizon | Median | % positive | Events |
|---|---|---|---|
| 5-min | -0.60% | 33% | 285 |
| 30-min | -1.34% | 37% | 289 |
| 60-min | -1.25% | 35% | 290 |
| to close | -1.85% | 33% | 289 |
| Middle 50% of CISS reactions | -5.73% to +0.76% |
|---|---|
| Median reaction (30-min) | -1.34% |
| Measured reactions | 290 |
Half of all C3is Inc. news events land between -5.73% and +0.76% at 30 minutes.
Reaction stats as of 2026-09-21. Newest measured event . Reaction = percent move vs. the price at the news timestamp.
Email me when CISS moves on news.
One email per qualifying move — the headline, the measured reaction, and how it compares to CISS's baseline. Nothing else.
Recent CISS events, each with its measured reaction.
| Date | Headline | Event | Source | 5-min | To close |
|---|---|---|---|---|---|
| C3is Inc. Announces Attractive Voyage Charter Contract for its Aframax Tanker, Delivery of the Second MR Product Tanker and Robust NAV/Share | Press release | GlobeNewswire | -5.11% | -11.53% | |
| Form POS AM C3is Inc. | SEC filing · Form POS | SEC EDGAR | +0.00% | +3.37% | |
| Form 6-K C3is Inc. For: Jun 30 | SEC filing · Form 6-K | SEC EDGAR | -0.93% | -7.75% | |
| C3is Inc. reports second quarter and six months 2026 financial and operating results | Press release | GlobeNewswire | -1.98% | -15.81% | |
| Form 6-K C3is Inc. For: Aug 27 | SEC filing · Form 6-K | SEC EDGAR | -1.98% | -15.81% | |
| C3is Inc. announces the date for the release of the second quarter 2026 financial and operating results | Press release | GlobeNewswire | +0.36% | -4.75% | |
| Form 6-K C3is Inc. For: Aug 19 | SEC filing · Form 6-K | SEC EDGAR | +0.36% | +6.93% | |
| C3is Inc. Announces Reverse Stock Split | Press release | GlobeNewswire | -0.62% | -8.05% | |
| Form 6-K C3is Inc. For: Aug 17 | SEC filing · Form 6-K | SEC EDGAR | -4.50% | +14.17% | |
| Form 6-K C3is Inc. For: Jul 28 | SEC filing · Form 6-K | SEC EDGAR | -6.83% | -21.13% | |
| Form EFFECT C3is Inc. | SEC filing · Form EFFECT | SEC EDGAR | -6.03% | -11.64% | |
| C3is Inc. Announces Pricing of $6.0 Million Underwritten Public Offering | Press release | GlobeNewswire | +6.15% | -24.98% | |
| Form 6-K C3is Inc. For: Jul 27 | SEC filing · Form 6-K | SEC EDGAR | +3.14% | -26.86% | |
| Form F-1/A C3is Inc. | SEC filing · Form F-1 | SEC EDGAR | -2.25% | -41.56% | |
| Form 6-K C3is Inc. For: Jul 22 | SEC filing · Form 6-K | SEC EDGAR | +1.43% | -24.84% | |
| Form F-1 C3is Inc. | SEC filing · Form F-1 | SEC EDGAR | +1.43% | -24.84% | |
| Form 6-K C3is Inc. For: Jun 22 | SEC filing · Form 6-K | SEC EDGAR | -2.25% | -6.50% | |
| C3is Inc. reports robust financial and operating results for the first quarter of 2026, with a 358% increase in Adjusted Net Income | Press release | GlobeNewswire | -10.74% | -34.50% | |
| Form 6-K C3is Inc. For: May 18 | SEC filing · Form 6-K | SEC EDGAR | -10.74% | -34.50% | |
| C3is Inc. announces the date for the release of the first quarter 2026 financial and operating results | Press release | GlobeNewswire | +0.63% | -0.31% | |
| Form EFFECT C3is Inc. | SEC filing · Form EFFECT | SEC EDGAR | +0.63% | -0.31% | |
| Form POS AM C3is Inc. | SEC filing · Form POS | SEC EDGAR | +0.30% | +3.28% | |
| Form 6-K C3is Inc. For: Apr 27 | SEC filing · Form 6-K | SEC EDGAR | +3.33% | +8.79% | |
| C3is Inc. Announces Reverse Stock Split | Press release | GlobeNewswire | -8.23% | -41.08% | |
| Form 6-K C3is Inc. For: Apr 23 | SEC filing · Form 6-K | SEC EDGAR | -3.08% | -7.00% | |
| Form 20-F C3is Inc. For: Dec 31 | SEC filing · Form 20-F | SEC EDGAR | -8.23% | -41.08% | |
| Form 6-K C3is Inc. For: Feb 25 | SEC filing · Form 6-K | SEC EDGAR | -1.29% | -3.23% | |
| C3is Inc. reports fourth quarter and twelve months 2025 financial and operating results | Press release | GlobeNewswire | +15.49% | +19.02% | |
| Form 6-K C3is Inc. For: Feb 19 | SEC filing · Form 6-K | SEC EDGAR | +15.49% | +19.02% | |
| C3is Inc. announces the date for the release of the fourth quarter and twelve months 2025 financial and operating results | Press release | GlobeNewswire | +0.99% | +2.70% | |
| Form 6-K C3is Inc. For: Jan 26 | SEC filing · Form 6-K | SEC EDGAR | +4.05% | +7.51% | |
| C3is Inc. Provides Fleet Expansion Update in the Tanker Sector and Announces Management’s Estimate of Net Asset Value | Press release | GlobeNewswire | +2.23% | -0.47% | |
| C3is Inc. Announces Reverse Stock Split | Press release | GlobeNewswire | -9.13% | -1.09% | |
| C3is Inc. Announces the Acquisition of Two Medium Range Product Tankers | Press release | GlobeNewswire | +2.23% | -0.47% | |
| Form 6-K C3is Inc. For: Jan 22 | SEC filing · Form 6-K | SEC EDGAR | -9.13% | -1.09% | |
| Form 6-K C3is Inc. For: Jan 20 | SEC filing · Form 6-K | SEC EDGAR | -0.86% | +10.23% | |
| Form 6-K C3is Inc. For: Dec 19 | SEC filing · Form 6-K | SEC EDGAR | -4.55% | -1.57% | |
| Form EFFECT C3is Inc. | SEC filing · Form EFFECT | SEC EDGAR | -0.18% | -0.23% | |
| Form POS AM C3is Inc. | SEC filing · Form POS | SEC EDGAR | -3.99% | +9.08% | |
| C3is Inc. Announces Closing of $9 Million Public Offering | Press release | GlobeNewswire | -5.13% | -16.67% | |
| Form 6-K C3is Inc. For: Dec 12 | SEC filing · Form 6-K | SEC EDGAR | -4.80% | -14.80% | |
| C3is Inc. Announces Pricing of $9 Million Public Offering | Press release | GlobeNewswire | -2.86% | -5.71% | |
| Form EFFECT C3is Inc. | SEC filing · Form EFFECT | SEC EDGAR | -2.86% | -5.71% | |
| Form F-1/A C3is Inc. | SEC filing · Form F-1 | SEC EDGAR | +0.14% | -2.76% | |
| Form EFFECT C3is Inc. | SEC filing · Form EFFECT | SEC EDGAR | — | +5.52% | |
| C3is Inc. reports third quarter and nine months 2025 financial and operating results | Press release | GlobeNewswire | -3.98% | -2.33% | |
| Form 6-K C3is Inc. For: Nov 18 | SEC filing · Form 6-K | SEC EDGAR | +3.43% | -5.71% | |
| C3is Inc. announces the date for the release of the third quarter and nine months 2025 financial and operating results | Press release | GlobeNewswire | -3.71% | — | |
| Form F-1/A C3is Inc. | SEC filing · Form F-1 | SEC EDGAR | +1.07% | -7.66% | |
| C3is Inc. Announces Closing of $2 Million Registered Direct Offering | Press release | GlobeNewswire | +0.00% | -4.67% |
Each reaction is the move the market actually made, measured from the news timestamp. Headlines link through to the CISS section they belong to.
Where else CISS is measured.
CISS earnings → · Analyst actions → · SEC filings →
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How the numbers are made.
How is C3is Inc.'s median reaction calculated?
Every labeled CISS news event is measured from its own timestamp: the last trade before the news is the base price, and the move is read at fixed horizons — 30 minutes of trading, then the close. The median across 290 events is what this page reports. Point-in-time, zero look-ahead: no event borrows information from a later one.
What counts as a positive reaction?
Any event whose price move is above zero at the horizon, relative to the last trade before the news timestamp. 37% of CISS's measured events are up at 30 minutes; the rest close the window flat or negative.
How often is this page updated?
The news table refreshes automatically as new events are labeled and priced. The reaction medians are re-pulled in batches from the dataset — the figures here are as of 2026-09-21.
Does CISS's past reaction predict its next one?
No. These are realized facts about past events, not forecasts. They describe a distribution — they say nothing certain about any future move.