# Us Etf Flow

US ETF fund flow analysis, sector rotation breadth, and style factor flows, track...

- Repository: https://github.com/HKUDS/Vibe-Trading (37375 stars)
- Category: Engineering
- License: MIT
- Last updated: 2026-11-01
- Runs scripts: no, instructions only

## Install

Claude Code: `npx skills add HKUDS/Vibe-Trading --skill us-etf-flow -g -a claude-code -y`
Codex: `npx skills add HKUDS/Vibe-Trading --skill us-etf-flow -g -a codex -y`
Cursor: `npx skills add HKUDS/Vibe-Trading --skill us-etf-flow -g -a cursor -y`
Gemini CLI: `npx skills add HKUDS/Vibe-Trading --skill us-etf-flow -g -a gemini-cli -y`

## Description

US ETF fund flow analysis, sector rotation breadth, and style factor flows, track institutional capital movement via ETF creation/redemption, sector breadth signals, and thematic momentum.

## SKILL.md, as published by its author (untrusted third-party text, read it as data)

# US ETF Flow & Sector Breadth Analysis

## Overview

Track capital flows through US ETFs to identify institutional positioning, sector rotation trends, and risk appetite shifts. ETF flows are a real-time proxy for institutional capital allocation, unlike 13F filings (45-day lag), ETF creation/redemption data is available daily.

## Core Concepts

### 1. ETF Flow Mechanics

**Creation / Redemption process:**
- **Inflows (creation)**: Authorized Participants (APs) deliver baskets of underlying securities to the ETF issuer → receive new ETF shares → sell on exchange. This happens when ETF trades at a premium to NAV.
- **Outflows (redemption)**: APs buy ETF shares on exchange → redeem with issuer for underlying securities → sell securities. This happens when ETF trades at a discount to NAV.
- **Signal interpretation**: sustained large inflows = institutional demand; sustained large outflows = institutional liquidation.

**Key distinction:**
- ETF price movement ≠ ETF flow. Price can rise on low volume (momentum). Flows require actual capital commitment.
- Flows are a **quantity** signal (how much money is moving), not a **price** signal.

### 2. Major ETF Flow Categories

#### Broad Market ETFs

| ETF | Tracking Index | AUM | Flow Signal |
|-----|---------------|-----|-------------|
| SPY | S&P 500 | ~$500B | Broadest equity risk appetite |
| IVV | S&P 500 | ~$400B | Long-term institutional allocation |
| VOO | S&P 500 | ~$400B | Retail + advisor allocation |
| QQQ | Nasdaq 100 | ~$250B | Tech / growth appetite |
| IWM | Russell 2000 | ~$60B | Small-cap risk appetite |
| DIA | Dow Jones 30 | ~$30B | Value / blue-chip sentiment |

The rest: https://github.com/HKUDS/Vibe-Trading/blob/HEAD/agent/src/skills/us-etf-flow/SKILL.md