# Transformers

Methods that calculate new fields or modify existing ones.

## Table Of Contents

* [otp.Source.corp_actions](https://docs.pip.distribution.sol.onetick.com/api/source/transformers/corp_actions.html.md)
* [otp.Source.fillna](https://docs.pip.distribution.sol.onetick.com/api/source/transformers/fillna.html.md)
* [otp.Source.mkt_activity](https://docs.pip.distribution.sol.onetick.com/api/source/transformers/mkt_activity.html.md)
* [otp.Source.pnl_realized](https://docs.pip.distribution.sol.onetick.com/api/source/transformers/pnl_realized.html.md)
* [otp.Source.transpose](https://docs.pip.distribution.sol.onetick.com/api/source/transformers/transpose.html.md)
* [otp.Source.virtual_ob](https://docs.pip.distribution.sol.onetick.com/api/source/transformers/virtual_ob.html.md)