JGB repo market in Japan

Wiki route

This entry sits under money-market index. Read it against BoJ open market operations for peer / contrast context and Japan money market for the broader system / regulatory boundary.

TL;DR

The JGB repo market is Japan’s secured short-term funding and collateral-financing layer. It is distinct from the uncollateralized call market: repo transactions exchange securities for cash with a commitment to repurchase the same or similar collateral later, while call transactions are short-term unsecured lending / borrowing.

For FinWiki, the repo market matters because it links BoJ policy implementation, JGB market liquidity, dealer balance sheets, securities lending, and short-rate transmission. It is also one of the best places to observe whether JGB-market functioning is improving or stressed.

Market Mechanics

GC vs SC

This distinction is important when reading stress. A broad funding problem may show in GC conditions, while scarcity in a specific JGB issue can show through SC demand, specialness, or securities-lending facility usage.

Data Surface

BoJ’s securities financing statistics cover repo transactions and securities lending transactions collected by the FSA and BoJ under the FSB data-collection framework. The published datasets include:

• daily flow data for new transactions;
• monthly stock data by counterparty and currency;
• yen transactions with Japanese government securities;
• securities lending transactions involving JGBs and yen;
• repo-rate series.

The scope is useful but not complete. Reporting focuses on major Japan-located financial institutions and excludes some internal, individual, central-bank, and advice-only transactions.

BoJ and Market Functioning

BoJ’s Securities Lending Facility provides a temporary and secondary source of JGBs to market participants to support liquidity and smooth market functioning. A 2025 BoJ Review linked the earlier surge and later decline in SLF borrowing to changes in JGB market liquidity, cash / futures / repo market functioning, BoJ purchase reductions, repo-rate stabilization, and investor positioning.

For analysis, SLF usage should be read as a market-functioning signal, not as a standalone policy target.

JapanFG Relevance

• BoJ monetary policy affects repo through market operations, JGB holdings, and short-rate expectations.
• tokyo-tanshi, central-tanshi, and ueda-yagi-tanshi connect the repo layer to the broader short-term money-market infrastructure.
• Megabanks such as mufg, smfg, and mizuho-fg are exposed through JGB holdings, collateral management, reserve balances, and wholesale funding.
• Securities firms such as mizuho-securities, mufg-mums, and nomura-hd are exposed through dealer inventory, market-making, and collateral finance.

Reading Rules

• Do not treat repo rates as the same instrument as the uncollateralized overnight call rate.
• Separate funding demand from specific-security scarcity.
• Check whether the issue is GC funding, SC specialness, securities lending, BoJ SLF usage, or broader JGB cash-market liquidity.
• When using current data, cite the exact BoJ monthly release because the numbers are time-specific and may be corrected later.

Related

• money-market INDEX
• japan-money-market
• call-market-structure
• boj-open-market-operations
• boj-monetary-policy
• local-bond-market
• tokyo-tanshi
• central-tanshi
• ueda-yagi-tanshi
• FinWiki index

Sources

• Bank of Japan: explanation of Statistics on Securities Financing Transactions in Japan.
• Bank of Japan: Statistics on Securities Financing Transactions in Japan release surface.
• Bank of Japan Review 2025-E-3: JGB market functioning and Securities Lending Facility usage.
• Bank of Japan: Securities Lending Facility.