# CRSP Cumulative Share/Volume Adjustment

`D02-F01-A05` · Corporate Actions and Security Master Data → Adjustment Factors · archetype `record-transform` · difficulty 3/5 · verification **verified**

Full page: https://docs.thefintechbuilder.com/corporate-actions-and-security-master-data/adjustment-factors/crsp-cumulative-share-volume-adjustment/
Agent skill: `npx skills add IslamBaraka90/Fintech-Algorithms-Library` — https://docs.thefintechbuilder.com/guides/agent-skill/

## Install and import

```bash
npm install fintech-algorithms
```

```ts
import { calculate } from "fintech-algorithms/corporate-actions-and-security-master-data/adjustment-factors/crsp-cumulative-share-volume-adjustment";
```

## Signature

```ts
calculate(data)
```

The volume counterpart of the CRSP price adjustment. Volume moves the opposite way to price across a split, and adjusting one without the other silently corrupts every turnover and liquidity measure downstream.

## Parameters

| Name | Type | Required | Notes |
| --- | --- | --- | --- |
| `data` | `{ schemaVersion: string; sourceRelease: string; crspBasisDate: string; extractCoverage: object; records: Record[] }` | yes | `crspBasisDate` sets the basis the adjusted volumes are expressed on. `extractCoverage` states the window the extract actually spans, so a partial extract cannot be mistaken for a complete history. |

## Returns

`{ schemaVersion, sourceRelease, crspBasisDate, extractCoverage, roundingDigits, rows }`

Adjusted volume rows with the provenance and rounding that produced them.

## Errors

- When the extract coverage does not span the requested records — throws

## Complexity

Time `O(n)`, space `O(n)`.

## Worked example

This is the worked example published in the article, replayed by the test suite on every run. The output cannot drift.

### Input

`data`:

```json
{
  "schemaVersion": "CRSP_US_STOCK_CIZ_2_0",
  "sourceRelease": "synthetic-ciz-2.0-fixture-v1",
  "crspBasisDate": "2024-09-05",
  "extractCoverage": "full_history",
  "records": [
    {
      "packageSecurityKey": "SYNTHETIC-CRSP-CIZ-001",
      "date": "2024-08-28",
      "frequency": "daily",
      "crspFactorField": "DlyCumFacShr",
      "crspCumulativeShareFactor": 4,
      "crspFactorStatus": "observed",
      "rawSharesOutstandingThousands": 250,
      "rawVolumeShares": 100
    },
    {
      "packageSecurityKey": "SYNTHETIC-CRSP-CIZ-001",
      "date": "2024-08-29",
      "frequency": "daily",
      "crspFactorField": "DlyCumFacShr",
      "crspCumulativeShareFactor": 4,
      "crspFactorStatus": "observed",
      "rawSharesOutstandingThousands": 250,
      "rawVolumeShares": 125
    },
    {
      "packageSecurityKey": "SYNTHETIC-CRSP-CIZ-001",
      "date": "2024-08-30",
      "frequency": "daily",
      "crspFactorField": "DlyCumFacShr",
      "crspCumulativeShareFactor": 1,
      "crspFactorStatus": "observed",
      "rawSharesOutstandingThousands": 1000,
      "rawVolumeShares": 460
    }
  ]
}
```

### Call

```ts
calculate(data)
```

### Returns

object with 1 field: rows

```json
{
  "rows": [
    {
      "crspAdjustedSharesOutstandingThousands": 1000,
      "crspAdjustedVolumeShares": 400
    },
    {
      "crspAdjustedSharesOutstandingThousands": 1000,
      "crspAdjustedVolumeShares": 500
    },
    {
      "crspAdjustedSharesOutstandingThousands": 1000,
      "crspAdjustedVolumeShares": 460
    }
  ]
}
```

## Verification and provenance

Tier: **verified** (via input-expected).

The worked example below is the figure published in this algorithm's article, replayed and asserted by the test suite on every build. The arithmetic cannot drift without the build failing.

Both tiers guarantee the signature. Full explanation: https://docs.thefintechbuilder.com/guides/verification/

Generated from the docs.json payload shipped inside fintech-algorithms@0.13.1.
The signature and parameter list are checked against the compiled implementation at build time,
so a description that contradicts the code fails the build rather than reaching this file.

## Links

- Article (how it works, step by step): https://thefintechbuilder.com/corporate-actions-and-security-master-data/adjustment-factors/crsp-cumulative-share-volume-adjustment/
- Implementation source: https://github.com/IslamBaraka90/Fintech-Algorithms-Library/blob/main/src/corporate-actions-and-security-master-data/adjustment-factors/crsp-cumulative-share-volume-adjustment/impl.ts
- Standalone repository: https://github.com/IslamBaraka90/Fintech-CRSP-Cumulative-Share-Volume-Adjustment-Corporate-Actions-algorithm
- Package on npm: https://www.npmjs.com/package/fintech-algorithms
- Domain index for agents: https://docs.thefintechbuilder.com/corporate-actions-and-security-master-data/llms.txt