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

Element	Explanation
Repo transaction	Securities or other financial assets are provided in exchange for cash, with a commitment to repurchase the same or similar collateral at a fixed price on a future date.
JGB repo	Repo where the securities / collateral are Japanese government securities and the cash leg is often yen.
Cash borrowing side	Securities provider / repo side; receives cash against collateral.
Cash lending side	Securities recipient / reverse repo side; provides cash and receives collateral.
Securities lending with cash collateral	Economically adjacent to repo and included in BoJ securities-financing statistics.
Repo rate	BoJ statistics calculate volume-weighted repo rates using repo transactions and cash-collateralized securities lending after adjusting for lending fees or rebate rates.

GC vs SC

Type	Meaning	Typical use
GC repo	General collateral: securities are not specified.	Primarily funding and cash management.
SC repo	Special collateral: securities are specified.	Borrowing a specific JGB issue or financing a particular collateral need.

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.

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.