ALGN Reddit Mentions | ChartExchange

I've been working on a side project:
**An Open Source algorithm that tries to predict which stocks are going to be added to the S&P 500.**
Why? Because when a stock gets added, it almost always pops hard - sometimes 5-10%+ - and funds are
forced to buy in. It's not exactly insider info, but the market definitely moves before *retail* hears the news.
And here's the fun part:
**The next rebalance is happening Sept 5 (next week) - so I figured I'd open-source the whole thing now and let people watch in real time.**
What I'm sharing:
* A model that ranks stocks most likely to get added next.
* Backtest results showing how this would've worked over the last few years (2023-2024)
* Full code on Google Colab (so you can run it or tweak it directly)
* Predictions for this upcoming rebalance
This isn't some magic crystal ball - it's just a combo of fundamental filters (market cap, liquidity,
profitability rules, etc.) + historical patterns around past inclusions. But the hit rate is surprisingly solid.
I'm not selling anything so, I do recommend doing additional research. Just thought it'd be cool to share
with people who are into this stuff. If nothing else, it's a fun exercise in market structure + alpha hunting.
Would love feedback, questions, or insults. Let's see how it does next week. 👀

Link: [https://colab.research.google.com/drive/1HlO4n7jVK-A9YUD6AIeJb1ohm3W0ozLK#scrollTo=qWuFoCWvXxPb](https://colab.research.google.com/drive/1HlO4n7jVK-A9YUD6AIeJb1ohm3W0ozLK#scrollTo=qWuFoCWvXxPb)
Predicted Addition:
*If the prediction changes before the announcement, I'll update it in the comments.*
**1. CRH (CRH plc)**
. Sector: Basic Materials
. Fitness Score: 72.5%
. Market Cap: $75,856,535,552
. Key Strengths: Profitable: True Liquidity Ratio: 1.56
**2. VIK (Viking Holdings Ltd)**
. Sector: Consumer Cyclical
. Fitness Score: 72.3%
. Market Cap: $28,210,251,776
. Key Strengths: Profitable: True, Liquidity Ratio: 4.20
**3. HEI (HEICO Corporation)**
· Sector: Industrials
. Fitness Score: 72.3%
. Market Cap: $37,796,229,120
. Key Strengths: Profitable: True, Liquidity Ratio: 1.20

**4. RBA (RB Global, Inc.)**
· Sector: Industrials
. Fitness Score: 70.8%
. Market Cap: $21,258,510,336
. Key Strengths: Profitable: True, Liquidity Ratio: 1.29
**5. VEEV (Veeva Systems Inc.)**
. Sector: Healthcare
. Fitness Score: 70.8%
. Market Cap: $43,990,511,616
. Key Strengths: Profitable: True, Liquidity Ratio: 2.85
# S&P 500 Prediction Algorithm Backtest Report

**Generated:** 2025-08-30 17:57:31
**Backtest Period:** 2023-01-01 to 2024-06-30
**Rebalancing Dates Tested:** 6

## Overall Performance

**Periods with actual changes:** 6
**Total periods tested:** 6

### Addition Predictions
- **Average Precision:** 0.100
- **Average Recall:** 0.105
- **Average F1 Score:** 0.102
- **Hit Rate:** 66.7% (4/6 periods)

### Removal Predictions
- **Average Precision:** 0.017
- **Average Recall:** 0.015
- **Average F1 Score:** 0.016
- **Hit Rate:** 16.7% (1/6 periods)

## Individual Period Results

### 2023-03-17 00:00:00

**Additions:**
- Predicted: ['AJG', 'TDG', 'INTU', 'LIN', 'TT', 'MS', 'PANW', 'SCHW', 'FI', 'ORCL']
- Actual: ['PODD', 'RVTY', 'STLD', 'EG', 'FICO', 'AXON', 'FSLR', 'GEHC', 'FI', 'BG']
- Correct: ['FI']
- Precision: 0.100

**Removals:**
- Predicted: ['LNC', 'SWK', 'CE', 'LRCX', 'NFLX', 'GOOG', 'ALGN', 'VTRS', 'LYB', 'JKHY']
- Actual: ['SBNY', 'SIVB', 'FRC', 'RE', 'LUMN', 'VNO', 'ABMD', 'FBHS', 'FISV', 'PKI']
- Correct: []
- Precision: 0.000

### 2023-06-16 00:00:00

**Additions:**
- Predicted: ['AJG', 'UBER', 'TDG', 'INTU', 'LIN', 'TT', 'FI', 'MS', 'PANW', 'ORCL']
- Actual: ['RVTY', 'EG', 'AXON', 'COR', 'PANW', 'FICO', 'FI', 'KVUE']
- Correct: ['PANW', 'FI']
- Precision: 0.200

**Removals:**
- Predicted: ['LNC', 'SWK', 'CE', 'LRCX', 'GOOG', 'NFLX', 'ALGN', 'VTRS', 'LYB', 'JKHY']
- Actual: ['ABC', 'FRC', 'AAP', 'DISH', 'RE', 'LUMN', 'PKI', 'FISV']
- Correct: []
- Precision: 0.000

### 2023-09-15 00:00:00

**Additions:**
- Predicted: ['UBER', 'AMAT', 'TDG', 'INTU', 'LIN', 'TT', 'MS', 'PANW', 'FI', 'ORCL']
- Actual: ['JBL', 'BX', 'UBER', 'HUBB', 'BLDR', 'VLTO', 'ABNB', 'COR', 'LULU', 'PANW', 'KVUE']
- Correct: ['UBER', 'PANW']
- Precision: 0.200

**Removals:**
- Predicted: ['LNC', 'LNT', 'SWK', 'CE', 'GOOG', 'NFLX', 'ALGN', 'VTRS', 'LYB', 'JKHY']
- Actual: ['ABC', 'LNC', 'AAP', 'DISH', 'SEDG', 'ALK', 'DXC', 'OGN', 'SEE', 'NWL', 'ATVI']
- Correct: ['LNC']
- Precision: 0.100

### 2023-12-15 00:00:00

**Additions:**
- Predicted: ['AJG', 'UBER', 'AMAT', 'TDG', 'INTU', 'LIN', 'TT', 'FI', 'PANW', 'ORCL']
- Actual: ['JBL', 'BX', 'UBER', 'HUBB', 'BLDR', 'VLTO', 'ABNB', 'DAY', 'DOC', 'LULU']
- Correct: ['UBER']
- Precision: 0.100

**Removals:**
- Predicted: ['LNT', 'SWK', 'CE', 'USB', 'GOOG', 'NFLX', 'ALGN', 'VTRS', 'LYB', 'JKHY']
- Actual: ['LNC', 'CDAY', 'SEDG', 'ALK', 'DXC', 'OGN', 'SEE', 'NWL', 'ATVI', 'PEAK']
- Correct: []
- Precision: 0.000

### 2024-03-15 00:00:00

**Additions:**
- Predicted: ['UBER', 'AMAT', 'TDG', 'PLTR', 'INTU', 'LIN', 'TT', 'PANW', 'FI', 'ORCL']
- Actual: ['SMCI', 'SOLV', 'DECK', 'GEV', 'VST', 'CPAY', 'DAY', 'DOC']
- Correct: []
- Precision: 0.000

**Removals:**
- Predicted: ['LNT', 'SWK', 'CE', 'USB', 'GOOG', 'NFLX', 'ALGN', 'VTRS', 'LYB', 'JKHY']
- Actual: ['XRAY', 'CDAY', 'WHR', 'PXD', 'FLT', 'ZION', 'VFC', 'PEAK']
- Correct: []
- Precision: 0.000

### 2024-06-21 00:00:00

**Additions:**
- Predicted: ['UBER', 'AMAT', 'TDG', 'BAC', 'INTU', 'TT', 'PANW', 'SCHW', 'FI', 'ORCL']
- Actual: ['KKR', 'SOLV', 'GEV', 'CRWD', 'VST', 'CPAY', 'GDDY', 'SW']
- Correct: []
- Precision: 0.000

**Removals:**
- Predicted: ['LNT', 'SWK', 'CE', 'GOOG', 'NFLX', 'ALGN', 'VTRS', 'TFX', 'LYB', 'JKHY']
- Actual: ['XRAY', 'WRK', 'PXD', 'CMA', 'FLT', 'RHI', 'ILMN', 'VFC']
- Correct: []
- Precision: 0.000

# S&P 500 Prediction Algorithm Backtest Report

**Generated:** 2025-08-30 17:57:31
**Backtest Period:** 2023-01-01 to 2024-06-30
**Rebalancing Dates Tested:** 6

## Overall Performance

**Periods with actual changes:** 6
**Total periods tested:** 6

### Addition Predictions
- **Average Precision:** 0.100
- **Average Recall:** 0.105
- **Average F1 Score:** 0.102
- **Hit Rate:** 66.7% (4/6 periods)

### Removal Predictions
- **Average Precision:** 0.017
- **Average Recall:** 0.015
- **Average F1 Score:** 0.016
- **Hit Rate:** 16.7% (1/6 periods)

## Individual Period Results

### 2023-03-17 00:00:00

**Additions:**
- Predicted: ['AJG', 'TDG', 'INTU', 'LIN', 'TT', 'MS', 'PANW', 'SCHW', 'FI', 'ORCL']
- Actual: ['PODD', 'RVTY', 'STLD', 'EG', 'FICO', 'AXON', 'FSLR', 'GEHC', 'FI', 'BG']
- Correct: ['FI']
- Precision: 0.100

**Removals:**
- Predicted: ['LNC', 'SWK', 'CE', 'LRCX', 'NFLX', 'GOOG', 'ALGN', 'VTRS', 'LYB', 'JKHY']
- Actual: ['SBNY', 'SIVB', 'FRC', 'RE', 'LUMN', 'VNO', 'ABMD', 'FBHS', 'FISV', 'PKI']
- Correct: []
- Precision: 0.000

### 2023-06-16 00:00:00

**Additions:**
- Predicted: ['AJG', 'UBER', 'TDG', 'INTU', 'LIN', 'TT', 'FI', 'MS', 'PANW', 'ORCL']
- Actual: ['RVTY', 'EG', 'AXON', 'COR', 'PANW', 'FICO', 'FI', 'KVUE']
- Correct: ['PANW', 'FI']
- Precision: 0.200

**Removals:**
- Predicted: ['LNC', 'SWK', 'CE', 'LRCX', 'GOOG', 'NFLX', 'ALGN', 'VTRS', 'LYB', 'JKHY']
- Actual: ['ABC', 'FRC', 'AAP', 'DISH', 'RE', 'LUMN', 'PKI', 'FISV']
- Correct: []
- Precision: 0.000

### 2023-09-15 00:00:00

**Additions:**
- Predicted: ['UBER', 'AMAT', 'TDG', 'INTU', 'LIN', 'TT', 'MS', 'PANW', 'FI', 'ORCL']
- Actual: ['JBL', 'BX', 'UBER', 'HUBB', 'BLDR', 'VLTO', 'ABNB', 'COR', 'LULU', 'PANW', 'KVUE']
- Correct: ['UBER', 'PANW']
- Precision: 0.200

**Removals:**
- Predicted: ['LNC', 'LNT', 'SWK', 'CE', 'GOOG', 'NFLX', 'ALGN', 'VTRS', 'LYB', 'JKHY']
- Actual: ['ABC', 'LNC', 'AAP', 'DISH', 'SEDG', 'ALK', 'DXC', 'OGN', 'SEE', 'NWL', 'ATVI']
- Correct: ['LNC']
- Precision: 0.100

### 2023-12-15 00:00:00

**Additions:**
- Predicted: ['AJG', 'UBER', 'AMAT', 'TDG', 'INTU', 'LIN', 'TT', 'FI', 'PANW', 'ORCL']
- Actual: ['JBL', 'BX', 'UBER', 'HUBB', 'BLDR', 'VLTO', 'ABNB', 'DAY', 'DOC', 'LULU']
- Correct: ['UBER']
- Precision: 0.100

**Removals:**
- Predicted: ['LNT', 'SWK', 'CE', 'USB', 'GOOG', 'NFLX', 'ALGN', 'VTRS', 'LYB', 'JKHY']
- Actual: ['LNC', 'CDAY', 'SEDG', 'ALK', 'DXC', 'OGN', 'SEE', 'NWL', 'ATVI', 'PEAK']
- Correct: []
- Precision: 0.000

### 2024-03-15 00:00:00

**Additions:**
- Predicted: ['UBER', 'AMAT', 'TDG', 'PLTR', 'INTU', 'LIN', 'TT', 'PANW', 'FI', 'ORCL']
- Actual: ['SMCI', 'SOLV', 'DECK', 'GEV', 'VST', 'CPAY', 'DAY', 'DOC']
- Correct: []
- Precision: 0.000

**Removals:**
- Predicted: ['LNT', 'SWK', 'CE', 'USB', 'GOOG', 'NFLX', 'ALGN', 'VTRS', 'LYB', 'JKHY']
- Actual: ['XRAY', 'CDAY', 'WHR', 'PXD', 'FLT', 'ZION', 'VFC', 'PEAK']
- Correct: []
- Precision: 0.000

### 2024-06-21 00:00:00

**Additions:**
- Predicted: ['UBER', 'AMAT', 'TDG', 'BAC', 'INTU', 'TT', 'PANW', 'SCHW', 'FI', 'ORCL']
- Actual: ['KKR', 'SOLV', 'GEV', 'CRWD', 'VST', 'CPAY', 'GDDY', 'SW']
- Correct: []
- Precision: 0.000

**Removals:**
- Predicted: ['LNT', 'SWK', 'CE', 'GOOG', 'NFLX', 'ALGN', 'VTRS', 'TFX', 'LYB', 'JKHY']
- Actual: ['XRAY', 'WRK', 'PXD', 'CMA', 'FLT', 'RHI', 'ILMN', 'VFC']
- Correct: []
- Precision: 0.000

document.getElementById("YQBgQV").onerror = function(){this.style.display='none';}; .dark-mode .Sx87zj{ color: white; background-color: #333333; border: 2px solid white; }.light-mode .Sx87zj{ color: #333333; background-color: white; border: 2px solid #333333; }ALGNAlign Technology Incstock NASDAQ

ALGN
Align Technology Inc
stock NASDAQ