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On-the-Run Securities: The Newest, Most Liquid Bonds
An on-the-run security is the most recently auctioned Treasury of a given maturity. It trades more actively than any older bond of similar term, and that liquidity earns it a small but persistent price premium. Understanding the on-the-run versus off-the-run distinction explains a lot about how the Treasury market really prices bonds.
Key Takeaways
- On-the-run securities are the newest Treasury issue at each benchmark maturity (for example the latest 2-year, 5-year, 10-year, and 30-year).
- Older issues become off-the-run the moment a newer bond of the same maturity is auctioned, and they trade less frequently.
- On-the-run bonds are more liquid, quote at tighter bid-ask spreads, and yield slightly less because buyers pay a liquidity premium.
- The on-the-run versus off-the-run yield gap widens in stressed markets, which is why it is watched as a signal of funding strain.
Key Takeaways
- On-the-run securities are the newest Treasury issue at each benchmark maturity (for example the latest 2-year, 5-year, 10-year, and 30-year).
- Older issues become off-the-run the moment a newer bond of the same maturity is auctioned, and they trade less frequently.
- On-the-run bonds are more liquid, quote at tighter bid-ask spreads, and yield slightly less because buyers pay a liquidity premium.
- The on-the-run versus off-the-run yield gap widens in stressed markets, which is why it is watched as a signal of funding strain.
What It Is
The US Treasury sells notes and bonds through regular auctions. Each time a new security of a particular maturity is issued, it takes over as the on-the-run bond for that maturity. The previously on-the-run issue is then labeled off-the-run, and the one before that is sometimes called double off-the-run.
There is exactly one on-the-run security per benchmark maturity at any time. Everything else with a similar remaining term is off-the-run. The difference is not about credit quality, since both are backed by the same US government, and it is not about maturity date, which can be nearly identical. The difference is purely about age of issue and the trading activity that follows from it.
The Intuition
Dealers, hedge funds, and central banks concentrate their trading in the newest bond. It is the reference point for pricing, the easiest to buy or sell in size, and the standard collateral in repo markets. That concentration feeds on itself: because everyone trades the on-the-run, everyone can trade it cheaply, which makes them trade it even more.
An off-the-run bond of almost the same maturity is a near-perfect substitute in cash-flow terms, yet it sits in fewer active hands. To sell it quickly you accept a slightly lower price. Investors therefore demand a touch of extra yield to hold it, and that extra yield is the mirror image of the liquidity premium buyers pay for the on-the-run.
How It Works
Liquidity shows up in two linked ways: a narrower bid-ask spread and a lower yield.
- Bid-ask spread. An on-the-run 10-year note might quote with a spread of a fraction of a basis point, while a comparable off-the-run note quotes wider. The wider spread is a direct cost every time you trade.
- Yield. Because the on-the-run commands a higher price for the same coupons, its yield is lower. Since bond prices and yields move inversely, a higher price means a lower yield.
The typical on-the-run versus off-the-run yield difference for the 10-year is only a few basis points in calm markets. It is small because the two bonds are such close substitutes. But the gap is not zero, and it can jump during a crisis when investors rush toward the most liquid instrument they can find, a move sometimes called a flight to liquidity.
Worked Example
Suppose the current on-the-run 10-year note yields 4.20%, and a nearly identical off-the-run note, auctioned three months earlier and now with about 9.75 years left, yields 4.28%. The 8 basis point gap is the liquidity premium.
To translate that yield gap into price, use modified duration, which for a 10-year note is roughly 8.5. The approximate price difference is:
price change = modified duration x yield change = 8.5 x 0.08% = 0.68% of par.
So the off-the-run note trades about 0.68 points cheaper. If the on-the-run is priced at 100.00, the off-the-run sits near 99.32. On a $10 million face position, that is:
0.68% x $10,000,000 = $68,000.
An investor who does not need to trade often can capture that $68,000 by buying the cheaper off-the-run bond and holding it. The trade-off is accepting weaker liquidity if they later have to sell in a hurry.
Common Mistakes
- Assuming on-the-run and off-the-run bonds carry different credit risk. They do not. Both are direct obligations of the US Treasury; only liquidity differs.
- Ignoring the liquidity premium when comparing yields. An off-the-run bond that yields more is not automatically a better deal, since part of the extra yield compensates for harder trading.
- Treating the yield gap as constant. The spread widens sharply in stressed markets, so a strategy that shorts the premium can lose badly at the worst time.
- Forgetting that a bond rolls off-the-run automatically. The moment the next auction settles, today's benchmark becomes yesterday's, and its liquidity begins to fade.
Frequently Asked Questions
Q: What are on-the-run securities in plain terms? On-the-run securities are the most recently auctioned Treasury notes or bonds at each maturity. They are the market's active benchmarks and the easiest Treasuries to buy or sell.
Q: Why do on-the-run securities yield less than off-the-run bonds? Investors pay a premium for their liquidity. A higher price for the same coupons means a lower yield, so the newest bond usually yields a few basis points below an older, near-identical one.
Q: How does a bond stop being on-the-run? It happens automatically at the next auction of that maturity. When a new 10-year note is issued, the previous 10-year becomes off-the-run and trading activity shifts to the new benchmark.
Q: Is the on-the-run versus off-the-run spread useful as a market signal? Yes. A widening spread signals that investors are paying up for liquidity, which often accompanies funding stress or a flight to safety.
Q: Should individual investors care about this distinction? Buy-and-hold investors can often earn a little extra yield with off-the-run bonds, since they rarely need to sell quickly. Active traders usually prefer on-the-run issues for their tight spreads.
Sources
- TreasuryDirect. "How Treasury Auctions Work." https://www.treasurydirect.gov/instit/annceresult/press/preanre/auctinfo/auctinfo.htm
- Investopedia. "On the Run Treasury." https://www.investopedia.com/terms/o/ontherun.asp
- Federal Reserve Bank of New York. "The Liquidity Premium of On-the-Run Treasuries." https://www.newyorkfed.org/research/staff_reports/sr194.html
- SIFMA. "US Treasury Securities Statistics." https://www.sifma.org/resources/research/us-treasury-securities-statistics/
Disclaimer
This article is educational content only and is not financial advice. Nothing here is a recommendation to buy, sell, or hold any security. Consult a licensed advisor before making investment decisions.