> ## Documentation Index
> Fetch the complete documentation index at: https://docs.focusalpha.ai/llms.txt
> Use this file to discover all available pages before exploring further.

# Screen ETFs by Flows and Premium

> Filter ETFs by 20-day net creations and redemptions in dollars, and by the published premium or discount of market price to NAV.

Screening ETFs by flows and premium filters on two daily measures of how a fund is trading: `flow_20d`, the twenty-day net creation and redemption total in dollars, and `premium_discount`, the published gap between market price and NAV. Both are refreshed daily from the same series documented on [ETF Fund Flows](/etf/flows) and [ETF NAV](/etf/nav).

<Info>
  **Plan:** Fund · **Credits:** 1 per call; screen facets are free
</Info>

## The Flow Filters

<ParamField query="min_flow_20d" type="number">
  Twenty-day net flow floor in USD. A **negative ceiling** is how you find outflows: `max_flow_20d=-100000000` selects funds that lost at least \$100M over twenty days.
</ParamField>

Screen rows also carry `flow_1d` and `flow_5d` for reading, alongside the filterable `flow_20d`.

## How ETF Screen Flows Are Computed

Flows are computed, not vendor-reported: the change in split-adjusted shares outstanding times the previous day's split-adjusted NAV, per [ETF Fund Flows](/etf/flows). Computing on the split-adjusted basis is what prevents a [split](/etf/splits) from masquerading as a giant creation. A day whose shares × NAV does not reconcile to filed net assets carries **no flow** rather than an invented one, so a twenty-day total is a sum of verified days.

## The Premium Filters

<ParamField query="min_premium" type="number">
  Floor on the published premium/discount of market price to NAV. `max_premium` sets the ceiling — a negative bound selects discounts.
</ParamField>

Premium and discount are as published in the fund's own daily file. Persistent discounts concentrate in less-liquid books; a screen bounding `max_premium` below zero sorted by `premium_discount` surfaces them directly.

## Ranking on Flows and Premium

`sort=flow_20d` ranks the whole universe by twenty-day money movement — ascending for the biggest bleeders, descending for the biggest gatherers. `sort=premium_discount` ranks by dislocation. As on every ETF sort, funds without the measure fall into the `unranked` block rather than being invented.

## Related Screens

[By wrapper and structure](/screening/etf/by-wrapper) · [By size and fees](/screening/etf/by-size-and-fees) · [ETF fund flows](/etf/flows) · [ETF screening overview](/etf/screening)

<RequestExample>
  ```bash cURL theme={null}
  curl "https://api.focusalpha.ai/v1/etfs/screen?min_aum=500000000&sort=flow_20d&order=desc&limit=25" \
    -H "Authorization: Bearer $FOCUSALPHA_API_KEY"
  ```
</RequestExample>

<ResponseExample>
  ```json Response (XLV, fields trimmed) theme={null}
  {
    "data": [
      {
        "ticker": "XLV",
        "name": "State Street Health Care Select Sector SPDR ETF",
        "aum": 43909783508.08,
        "flow_1d": -102719020.2,
        "flow_5d": 277949692.4,
        "flow_20d": 69739330.85,
        "premium_discount": 0.03802
      }
    ]
  }
  ```
</ResponseExample>