Underwriting Services

Welcome! In this section of the DTCC Learning Center, access our comprehensive learning materials to maximize your usage of DTCC’s Underwriting Services. You may perform a Search, view the Resources tab (including filters to help narrow your search), and browse the Quick Links to learn more.

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Underwriting is the entry point for depository and book-entry transfer services at The Depository Trust Company (DTC). UW SOURCE is the system that gives you access to Underwriting functions. The Underwriting Central (UWC) application integrates data validation, electronic vaulting, and e-signatures to create a better experience for brokers and issuers. It improves upon UW SOURCE with a more streamlined user interface, fewer operational touch-points, improved data quality, and added transparency into the DTC eligibility life cycle. 

Learning Materials

Click the links below to view a list of associated resources, which you may filter by topic, format (document, video, etc.), and sort by title, date of publication, etc.

More Information

The following content is available through the www.dtcc.com site:

Underwriting Services and Asset Services - Flow Diagram (excerpt)

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NIIDS Outbound Data Elements - Mapped to Input

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New Issue Information Dissemination Service (NIIDS) Message Format

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Underwriting Central (UWC) Help

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Underwriting Frequently Asked Questions

Download this resource for answers to frequently asked questions about: Closing (New) Issues Chills Denomination Changes Eligibility ILOR MMI's UW SOURCE and more.
September 26, 2025

Underwriting Central (UWC) Quick Guide (MMI)

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UW SOURCE 871(m) Attestation Quick Tip Guide

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Underwriting Central (UWC): Submit to Issuer (Step 5 of the CD Creation Wizard) Transcript

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Underwriting Central: Submit to Issuer (Step 5 of the CD Creation Wizard)

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Underwriting Central (UWC) Quick Guide (CD)

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Underwriting Central: Using the UWC Dashboard Transcript

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Underwriting Central: Using the UWC Dashboard

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UWC DocuSign FAQ

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Performing Searches

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Adding an Offering with a Municipal Insured Sub Issue Type

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Creating a Draft Offering Activity for a Corporate Debt Sub Issue Type

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Reviewing Enhancements to the Security Grid

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Reviewing Enhancements to the Issue Grid in UW Source

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Reviewing Enhancements to the Offering Activity List and Offering List screens in UW Source

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Copying a Security

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Adding an Offering with a Municipal Insured Sub Issue Type when an Underlying Security Does Not Exist on UW Source

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Copying an Issue

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Submitting an Offering to DTC

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Modifying a Security and Adding the Interest Feature in UW Source

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Adding an Offering with a Unit Investment Trust (UIT) Sub Issue Type

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