block trades

[sonnytrader]

I am looking for a script scan to add to my watch list that shows block trades of 50k shares or me..thx if you can help

 

[antwerks]

https://tos.mx/!xbcTblzh
Thinkorswim does not directly expose block trade volume (like 50K share prints) through ThinkScript. However, you can approximate block trade detection by watching for unusually large volume spikes on a single candle, comparing volume to recent average and filtering to high-volume stocks only. The threshold can be changed as well as the multipliers. I run this on the 15 minute chart but you can change that too. Changing volume and market caps will dramatically increase hits!!!

# --- High Volume Spike Detector (Block Trade Approximation) ---

input volThreshold = 50000; # Absolute volume threshold per bar
input volumeMultiplier = 3.0; # How much larger than average volume
input avgPeriod = 20;

def avgVol = Average(volume, avgPeriod);
def spike = volume >= volThreshold and volume >= avgVol * volumeMultiplier;

plot scan = spike;

 

[antwerks]

Example of changing variables on hit returns

 

[antwerks]

adding Option volumes if you are an option player helps too!

 

[antwerks]

Example 2 minute scan Notice SCHW 218K block!

 

[antwerks]

here is a watchlist column script
# --- Block Trade Approximation: Watchlist Column Version ---

input volThreshold = 50000; # Volume spike per bar
input volumeMultiplier = 3.0; # Spike vs. average
input avgPeriod = 20;

def avgVol = Average(volume, avgPeriod);
def spike = volume >= volThreshold and volume >= avgVol * volumeMultiplier;

plot Data = spike;
Data.AssignValueColor(if spike then Color.GREEN else Color.GRAY);