Tape data above is 15-min delayed; platform data is real-time.
See the Market's Largest Trades — As They Happen
ThickPrints surfaces unusually large trades across stocks and ETFs in real time, helping traders spot where meaningful capital is moving before the crowd catches on.
When serious size shows up, it tends to attract attention. We make those moments impossible to miss.
Most Traders Are Watching the Wrong Things
Thousands of tickers move every day.
Most of that movement is noise.
What tends to matter are the moments when unusually large trades appear — when real capital suddenly enters the market.
Those moments often attract attention, spark momentum, or signal growing interest in a name or sector.
ThickPrints helps you spot them instantly.
A Real-Time Window Into Market Activity
ThickPrints continuously monitors the market and highlights unusually large trades the moment they occur.
You'll see:
- Block trades hitting the tape
- Dark pool activity occurring off-exchange
- Large leverage ETF trades that can hint at directional positioning
- Sector flows showing where activity is clustering
Instead of guessing which names matter today, you can see where unusual participation is happening.
How Traders Use ThickPrints
Find What's Getting Attention
Large trades often appear in the same names traders begin focusing on later in the day. Spot unusual activity early and add those tickers to your watchlist.
Add Context to Price Moves
When a stock breaks out or reverses, large prints can help reveal whether meaningful participation is appearing around the move. Sometimes that context matters.
Monitor Sector Activity
When large trades begin clustering in the same sector, it can hint at broader themes developing in the market. Follow the flow of attention.
Stay Selective
Instead of forcing trades out of boredom, many traders simply wait for moments when unusual activity appears. It's a surprisingly effective filter.
Everything You Need to Monitor Large Market Activity
Real-Time Thick Prints
Large trades surfaced instantly so you never miss meaningful activity.
Dark Pool Detection
See when trades occur off-exchange where large participants often transact.
Sector Flow Summary
See where block flow concentrates by sector — then drill into endorsement vs prints and top names by notional within a sector.
Historical Block Browser
Compare today's activity to previous trading sessions.
Interactive Charts
Analyze price action alongside large prints.
Watchlists & Alerts
Track the tickers you care about and get notified when activity appears.
The six highlights above are the headline story — here’s the full toolkit available inside the app, each as its own customizable window.
| Tool / window | What you use it for |
|---|---|
| Thick Prints | Live or historical tape of large block trades with filters (sector, DP/sweep, min size, etc.), pagination, and column controls. |
| Flow Highlights | Rule-based narration of notable prints — context on size, timing, and patterns as flow develops. |
| Leverage & Volatility | Focused view of large prints in leverage/volatility-related names and sectors. |
| Ticker Detail | Deep dive on a symbol: prints, Endorsement (levels vs block-file or live price), context, and related panels. |
| Dark Pool Levels | Visualize institutional print prices vs price over time for a ticker. |
| Volume Profile | Session/profile-style read of where size traded relative to price. |
| Volume vs Value | Scatter view: notional vs volume to spot unusual relationships across names. |
| Chart | Price charts with print overlays — open multiple chart windows if you want. |
| Sector Summary | Aggregate flow by sector vs optional compare date. |
| Sector Top Names | Rank tickers by notional inside a chosen sector (top N bars plus optional combined “Other” remainder). Optional No “Other” bar to show only the top N names. Optional lock to follow the selected print’s sector. |
| Sector Trend | Trend-style read of sector flow over your available history. |
| Sector Heatmap | Treemap of sector flow with directional bias and top names. |
| Time of Day Flow | How dollar flow stacks up by time bin vs typical sessions. |
| Quote Monitor | Multi-ticker quote grid with customizable columns. |
| Large Quote | Big, readable quote for one symbol — open more than one if needed. |
| Watchlist | Your symbols with optional sound alerts on activity. |
| Desk Briefing | Curated daily narrative and stats from your finalized tape. |
| News | Headlines tied to the ticker you’re focused on. |
| Clock | Optional world / session clock window for timing. |
| Kelly Calculator | Position-sizing thought experiment from edge and payoff assumptions. |
| Live & dates | Switch between live session and any historical day in your block archive; on weekends and market holidays, live shows no session until you pick a date. |
Markets Leave Clues
Large trades are one of the clearest signals that meaningful capital is moving.
ThickPrints makes those moments visible so traders can observe the market from a completely different perspective.
You may not always know why the trade happened.
But seeing where size appears can change how you watch the market.
