FINRA SLATE — Complete Guide for Market Data Professionals

1. What is FINRA SLATE?

SLATE (Securities Lending and Transparency Engine) is FINRA's securities lending transaction reporting facility, established under FINRA Rule 10210 (Securities Lending Reporting Requirements). It implements the reporting requirements mandated by Section 10(c) of the Securities Exchange Act of 1934, as amended by the Dodd-Frank Act and later SEC Rule 10c-1a.

The system collects and makes public information about securities lending transactions — specifically the terms under which broker-dealers lend securities. This creates a consolidated public record similar to what TRACE does for fixed income: a centralized, near-real-time view of a previously opaque market.

Why it matters for market data professionals: SLATE creates a new data stream for securities lending rates, loan terms, and availability. This data has direct implications for short-selling analysis, stock borrow cost modeling, and understanding the mechanics of equity lending desks. Anyone consuming market data for quantitative research, risk, or compliance needs to understand what SLATE publishes and how.

2. Who Must Report to SLATE?

Reporting obligations under FINRA Rule 10210 apply broadly to FINRA member firms involved in securities lending. Specifically:

• Broker-dealers that lend securities — Any FINRA member that lends securities to another party (including to customers, other broker-dealers, or prime brokers) must report the terms of each loan to SLATE.
• Prime brokers — Prime brokerage operations that facilitate securities lending between hedge fund clients and institutional lenders are covered.
• Securities lending intermediaries — Firms that act as agents or principals in arranging securities loans.

Who is NOT directly obligated: Buy-side institutions (hedge funds, asset managers, pension funds) lending via their prime broker do not report directly to SLATE — their prime broker reports on their behalf. Non-FINRA members (e.g., foreign banks lending to US counterparties through a US affiliate) may be covered through their US-registered affiliate.

Phased applicability: Phase 1 (January 2, 2026) covers the largest firms — those with gross securities lending activity above $10 billion annually. Phase 2 (July 1, 2026) extends reporting to all covered FINRA members regardless of size.

3. What Must Be Reported

Each securities lending transaction must be reported to SLATE within 15 minutes of execution. The required data fields cover the economics and terms of the loan:

FINRA publishes SLATE data with a 30-minute delay on its public website, with aggregated summary data available intraday. Historical transaction-level data is available for download with a 24-hour delay.

4. Market Data Implications

SLATE creates a new category of regulated market data with significant implications for quantitative analytics, risk management, and market surveillance. Key considerations:

Short interest as a proxy — now supplemented: Before SLATE, short interest data (reported twice monthly to FINRA under Rule 4560) was the primary public proxy for securities lending activity. SLATE provides near-real-time loan rate data, which is a more granular and timely signal of borrowing demand and short-selling pressure.

Borrow cost modeling: Quantitative strategies that model securities lending costs now have a regulatory data source to calibrate against. SLATE rates for specific securities provide a transparent benchmark for borrow cost assumptions. This is particularly relevant for:

• Hard-to-borrow (HTB) identification — high SLATE rates flag names under borrowing pressure
• Return modeling for short strategies — actual borrow costs are now publicly observable
• Prime broker spread analysis — comparing individual prime broker quotes to published SLATE averages

Connectivity for data consumers: FINRA distributes SLATE data via its Market Data Center infrastructure, similar to TRACE. Firms can access SLATE data through:

• FINRA's public website (30-minute delayed, web interface)
• FINRA Market Data Center FTP/SFTP feeds (intraday aggregated, daily transaction-level)
• Third-party data vendors redistributing FINRA SLATE data under license

Integration with existing data workflows: SLATE data uses CUSIP identifiers and standard field formats compatible with existing security master databases. Firms should plan to integrate SLATE borrow rates into their security master as an additional data field — similar to how dividend yield or days-to-cover are maintained.

5. SLATE Implementation Timeline

6. Official Resources & Links