Fixed Income Trading: The Definitive Guide to Understanding Bonds and Securities

Fixed income is the largest and least visible part of the capital markets. Equities attract the coverage; bonds carry the financing. For anyone working in or hiring into a UK fixed income business — an asset manager, a credit fund, a bank trading desk or an insurer’s investment team — understanding how the market actually functions matters more than the instrument definitions that dominate most introductory material.

This guide covers the sterling market as it works in practice: what is issued and by whom, how bonds are priced and traded, the risks that actually bite, the UK regulatory position after Brexit, and what the roles inside a fixed income business look like.

The UK fixed income market

Four issuer groups dominate sterling fixed income, and they behave differently.

Gilts. UK government bonds, issued by the Debt Management Office on behalf of HM Treasury through a syndication and auction programme. Gilts are the reference point for sterling credit, the collateral underpinning much of the repo market, and the instrument through which Bank of England policy transmits into the wider economy. Conventional gilts pay a fixed semi-annual coupon; index-linked gilts adjust principal and coupon in line with inflation.

Sterling corporate credit. Bonds issued by UK and international corporates in sterling, split between investment grade and high yield by the ratings assigned by agencies including Moody’s, S&P and Fitch. The sterling corporate market is smaller and less liquid than the euro or dollar equivalents, which matters more than most introductory guides acknowledge — position sizing and exit assumptions that work in dollars do not always transfer.

Supranationals, sovereigns and agencies. Issuers such as the European Investment Bank, the World Bank and other sovereigns issuing in sterling. High quality, typically well bid by liability-matching investors.

Securitised and structured credit. Residential and commercial mortgage-backed securities, asset-backed paper secured on auto loans, credit card receivables or equipment leases, and collateralised loan obligations. A specialist corner with its own analytical requirements and its own talent pool.

Who buys, and why it matters

The buyer base shapes how the market behaves, and it is more concentrated in the UK than in most jurisdictions.

Defined benefit pension schemes are the dominant natural buyer of long-dated gilts and index-linked gilts, because their liabilities are long and inflation-linked. That structural demand is why long-dated sterling behaves differently from long-dated dollar paper.

Insurers hold large sterling credit portfolios to match annuity liabilities, with regulatory capital treatment influencing what they can efficiently own.

Asset managers run both active and index-tracking mandates across the maturity and credit spectrum.

Banks hold gilts for liquidity purposes and make markets in both government and corporate paper.

And hedge funds trade relative value, macro and credit strategies, frequently with leverage.

Bond fundamentals

The core mechanics

Par value is the amount repaid at maturity and the reference for coupon calculation. Coupon is the stated interest rate, paid semi-annually on gilts and most sterling corporates. Maturity is when principal is repaid, with the sterling market conventionally split into short (under 7 years), medium (7–15) and long (over 15).

Yield is the return, and the number that actually matters. Current yield is coupon divided by price. Yield to maturity incorporates the coupon stream plus any capital gain or loss to redemption, and is the standard comparison measure.

The inverse relationship between price and yield is the single most important mechanic in the asset class. When market yields rise, the price of existing bonds falls, because a bond paying a fixed coupon is worth less when new issuance offers more. The magnitude of that move depends on duration.

Duration and convexity

Duration measures price sensitivity to yield changes. A bond with a modified duration of 8 will fall roughly 8% in price for a one percentage point rise in yields. Longer maturity and lower coupon both increase duration, which is why long-dated index-linked gilts are among the most rate-sensitive instruments in the sterling market.

Convexity captures the fact that the price-yield relationship is curved rather than linear. It matters for large moves rather than small ones — and 2022 was a reminder that large moves happen.

Embedded options

Callable bonds can be redeemed early by the issuer, typically when rates have fallen — which caps the investor’s upside. Puttable bonds allow the holder to require early redemption. Convertible bonds can be exchanged for equity on defined terms. Each changes the risk profile in ways a simple yield comparison will miss.

How bonds actually trade

Unlike equities, bonds trade principally over the counter rather than on a central exchange, and the structure has consequences.

The primary market is where new issues are sold. Gilts come via DMO auctions and syndications; corporate issues are underwritten and distributed by investment banks to institutional buyers. Pricing is set through a bookbuilding process against a benchmark gilt yield plus a credit spread.

The secondary market is dealer-intermediated. A relatively small number of banks make markets, quoting bid and offer prices, and liquidity varies enormously — a benchmark gilt trades in size continuously, while a small corporate issue may not trade for weeks. That liquidity dispersion is the practical reality of fixed income and it is what most textbook treatments understate.

Electronic platforms have taken a growing share, particularly in government bonds and liquid credit, improving price transparency and reducing execution costs. Voice trading persists where size or complexity requires it.

Repo underpins the whole structure — the market in which bonds are exchanged for cash on a short-term secured basis. It funds leveraged positions, supports market-making inventory, and is where liquidity stress shows up first.

The risks that actually bite

Risk	What it is	How it is managed
Interest rate	Price falls as yields rise	Duration targets, hedging with futures or swaps
Credit	Issuer fails to pay	Diversification, credit analysis, ratings limits
Liquidity	Cannot exit at a fair price	Position sizing, issue-size limits, cash buffers
Inflation	Real value of fixed payments erodes	Index-linked holdings, shorter duration
Reinvestment	Proceeds reinvested at lower yields	Maturity laddering
Call	Early redemption when rates fall	Call-adjusted analysis, call protection
Counterparty	Trading or repo counterparty fails	Collateral, margining, central clearing
Collateral / margin	Cash calls on hedges as rates move	Liquidity buffers, stress testing

The last row deserves particular attention in a UK context, because it is the one the market learned about the hard way.

The 2022 LDI episode

In late September 2022, sterling gilt yields rose sharply and rapidly following the fiscal announcement of 23 September. Many defined benefit pension schemes used liability-driven investment strategies employing leverage to hedge interest rate and inflation exposure — and as yields rose, those hedges generated collateral calls faster than schemes could meet them by selling assets. Forced gilt selling pushed yields higher still.

The Bank of England intervened with a temporary programme of long-dated gilt purchases to restore orderly market conditions, and subsequently with a temporary expanded collateral repo facility.

The episode is worth understanding properly rather than as a headline, because it demonstrated something that applies well beyond pension funds: a hedge that works on a mark-to-market basis can still fail on a liquidity basis. Duration was managed; the collateral consequence of managing it was not. It has shaped how UK institutions think about liquidity buffers and operational readiness ever since, and it is a genuinely useful reference point when assessing risk professionals.

The UK regulatory position

Post-Brexit the UK operates its own regime, onshored from EU legislation and now diverging.

UK MiFIR and the onshored MiFID II framework govern trading transparency, transaction reporting and best execution. The FCA has been reforming the transparency regime for bonds and derivatives through the Wholesale Markets Review, with the aim of a regime better calibrated to how fixed income actually trades than the inherited EU rules were.

A consolidated tape for bonds has been a central part of that work — a single stream of post-trade data intended to improve price transparency in a market where it has historically been poor.

Prudential rules apply through the PRA for banks and insurers, and through the FCA’s MIFIDPRU regime for investment firms, shaping how fixed income positions are capitalised.

Benchmark reform is complete: sterling LIBOR has been replaced by SONIA as the reference rate for floating-rate sterling instruments, a transition that reshaped documentation across the market.

And SM&CR applies to senior individuals at authorised firms, allocating specific responsibilities to named people — which is why fixed income leadership hiring in regulated firms carries an approval timetable that other sectors do not.

The roles inside a fixed income business

For anyone considering the sector or building a team within it, the functions divide fairly cleanly.

Portfolio management and trading. Running risk — taking duration, curve, credit and relative value positions within a mandate or a risk limit. The defining requirement is judgement under uncertainty, demonstrated across a full cycle rather than a favourable stretch.

Credit research. Analysing issuers to form a view on default risk and relative value. Rewards depth and scepticism, and the analysts who progress are the ones whose calls are followed rather than merely filed.

Quantitative research. Modelling curves, spreads, prepayment behaviour and relative value systematically. Competes for talent with technology firms as much as with other funds.

Risk management. Independent oversight of duration, credit, liquidity and collateral exposures. Deliberately not compensated on investment performance, for obvious reasons — and considerably more commercially consequential since 2022.

Operations, settlement and collateral. The infrastructure that makes trading possible. Institutional allocators examine this closely during operational due diligence, and weakness here loses mandates before performance is ever discussed.

And compliance. Transaction reporting, best execution, market abuse surveillance and the SMF-designated responsibilities that attach to senior roles.

What this means for hiring

Three observations from searching in this market.

Cycle experience is the scarcest attribute. A generation of fixed income professionals built their careers in a falling-rate environment. Those who have managed a book through a genuine rate shock — and can describe what they actually did rather than what the model said — are a materially smaller group, and firms increasingly price for it.

Risk and control appointments have become commercially consequential. They were once treated as necessary overhead. Institutional counterparties and allocators now examine them directly, and a credible CRO or head of internal audit is a condition of raising capital rather than a compliance formality.

And SMF appointments carry a timetable most hiring managers underestimate. Regulatory approval sits between offer and start, and planning a search on a conventional notice-period assumption produces an uncomfortable gap.