A loss run is your carrier’s own record of what has been claimed under your policy: what it paid, what it is still holding in reserve, and what it closed without paying anything at all. It is the first document an underwriter asks for, and the last one most owners read.
The one document in your submission you did not write
Everything else a market receives about your building comes from you or from someone working for you. The application is yours. The values are yours. The description of the tenants is yours.
The loss run is not. It is generated by an insurer’s own claims system, it says what it says, and it is the reason a submission is believable at all. That independence is the whole source of its weight — and it is also why the useful move is never to manage the document, but to read it early and explain it yourself.
Owners who treat it as an administrative errand hand a broker a file they have never opened. Owners who treat it as a piece of their own building’s record arrive at renewal with something to say.
What is actually on the page
The layout differs by insurer and the substance does not. Expect to find, for each claim: a claim number, the date of loss and the date reported, the policy period it fell in, a cause or peril description, the status of the file, and a set of amounts.
Two fields do more work than the rest. The cause description is a short coded phrase — water damage, wind, slip and fall, theft — and it is the field that turns a list into a pattern. The status tells you whether the insurer considers the matter finished.
Read the report the way an underwriter will: down the cause column first, then across to the amounts. The story is almost always in the repetition, not in the largest single line.
Paid, reserved, and why the two are not the same
The amounts on a loss run are doing different jobs and owners regularly conflate them.
Paid is what has actually gone out — indemnity to you or on your behalf, plus whatever the insurer spent handling it. Reserved is an estimate the insurer is holding against what it may still have to pay on a file that is not finished. Incurred is the two together, and it is the figure most underwriters read first because it represents the insurer’s current view of what the claim will ultimately have cost.
The consequence is that an old claim can still be moving. Reserves rise and fall as a file develops, and the insured does not get a vote. A file left open with a meaningful reserve is read as unfinished business regardless of how quiet it has been, which is why it is worth asking your adjuster or producer whether anything stale can properly be closed before you market a renewal.
Closed without payment is not nothing
A claim reported and closed without any payment is a real entry, and owners are often surprised that it appears at all.
It is not neutral and it is not damning. Read charitably, it shows a building where things get reported and handled properly. Read less charitably, a long list of them suggests either a property that generates a lot of incidents or a management habit of reporting everything to the carrier rather than deciding what is a claim.
The practical guidance is the boring one: it belongs in the conversation with your producer before something happens, not after. Who reports what, and to whom, is one of the things worth settling with whoever runs the building — the subject of what your property manager should do about insurance.
The valuation date is why two copies disagree
If you have ever held two loss runs that did not match, the reason is almost always the date each was produced.
A loss run is a snapshot. Reserves move, files close, subrogation recoveries come back and reduce net amounts. A report produced at one renewal and the same report produced at the next can show different figures for the identical claim, and neither is wrong.
Two habits follow. Always note the date the report was generated and quote it when you send it on. And when a market has been holding your submission for a while, refresh the run rather than letting an old snapshot be the basis of a decision. Where a recovery is likely — a loss caused by a tenant or a contractor — the lease terms that decide whether recovery is even available are the subject of waiver of subrogation in a commercial lease.
What an underwriter is reading out of it
An underwriter is not counting claims. They are trying to answer one question: is what happened here likely to happen again.
That produces a few consistent readings. Repetition of cause is the strongest signal on the page — the same water loss three renewals running is a plumbing conversation, not a luck conversation. Frequency without severity often concerns a market more than a single large loss, because a pattern of small events suggests a condition and a single event may suggest weather. Recency matters more than depth, and an event during the current owner’s tenure reads differently from one inherited. Open files are unfinished. And a weather loss inside a widely declared event reads differently from an isolated one — the NOAA Storm Events Database is where anyone can check which it was.
Property and liability records are read against different things. A property run is read against the structure; a liability run is read against how the premises are managed and who else was responsible under the lease, which is where who insures what under an NNN lease and what a landlord needs on the tenant’s policy start to matter. Background on how commercial lines are classified is published by the Insurance Information Institute, and the recurring physical causes behind nonresidential fire losses are documented by the U.S. Fire Administration.
Real-World Scenario: An owner markets a renewal on a multi-tenant building with a loss run showing several water losses spread across the ownership period. The submission goes out with the document attached and nothing else. The first market reads three water claims and declines without a second conversation. The owner then sits down with the run and discovers what nobody had assembled: two of the losses came from the same failed supply line, and the third followed a tenant’s equipment installation that the tenant’s own insurer had already reimbursed. The line was repiped, the tenant’s work was corrected, and there is an invoice for each. Resubmitted with that explanation and the paperwork attached, the same record produces offers. The claims never changed. The only thing that changed was whether anyone had explained them.
Prefacing a difficult run
A loss run with real claims on it is not a barrier. An unexplained loss run with real claims on it very often is.
If your record has anything on it worth explaining, write the explanation and attach it to the submission. For each significant claim: what happened, what caused it, what was done about it, when, and what evidence exists. An invoice, a permit, a contractor’s report, a photograph. Say plainly where a loss was somebody else’s responsibility and what changed contractually as a result.
This is not spin and it should not read like it. It is the difference between an underwriter reading a line of data and inventing a theory, and an underwriter reading a closed question. The theory they invent is rarely more generous than the facts. Where a difficult record has already produced a notice, the sequence to follow is in non-renewal in commercial property.
Getting yours, and when
Ask your producer, who requests it from the carrier; as the policyholder you can also request it from the insurer directly. Ask for every carrier that has written the building, not only the current one, and give real lead time — these reports come out of a service unit with no stake in your renewal calendar.
Do it well before you need it, and read it yourself when it arrives. Read it against your own declarations page while you are at it, because the two together tell you whether the deductible structure you are carrying matches the losses you are actually having — see the declarations page and the two pages nobody reads. If a stretch of vacancy sits behind any of the claims, the vacancy clause and when it starts running explains why that period is read separately.
What a clean run buys you, and what it does not
A clean record removes a reason to decline and gives you standing. It does not set your terms on its own, and treating it as an entitlement makes for a disappointing renewal conversation.
Construction, occupancy, valuation, protection and the market’s own condition all move alongside it. What a clean run does reliably is widen the field of markets willing to look, and a wider field is worth more than any single concession. The underlying exposures those markets are pricing sit on the commercial property, general liability and umbrella pages, and how a multi-tenant center changes the picture is covered on the retail pillar.
If you are reading a seller’s record rather than your own, the wider document set and how to ask for it is in reading a commercial building’s insurance history. Your own state department of insurance — indexed by the National Association of Insurance Commissioners — is the authority on what an insurer owes you in the way of records. When you have your run in hand and want to know how it will read, send it over.