By owner

GET /v1/trainers/{trainer_id}/owners

Split by who owns the horse.

Available on

Free key not on this plan

Live not on this plan

Archive not on this plan

Complete not on this plan

Complete + Analyst 2017 → upcoming

Send your key in the X-API-Key header, or as ?key= if your tool cannot set one. A date outside your plan's window returns 403 outside_window naming the window, never an empty array.

Parameters

Name	In	Type	Required	Description
trainer_id	path	string	yes	Opaque trainer identifier.
min_runs	query	integer	no	Drop owners with fewer runners than this. Defaults to 5.

Request

curl https://api.apihorseracing.com/v1/trainers/tr_2QVAXT3/owners \
  -H "X-API-Key: $AHR_KEY"

$ch = curl_init('https://api.apihorseracing.com/v1/trainers/tr_2QVAXT3/owners');
curl_setopt_array($ch, [
    CURLOPT_RETURNTRANSFER => true,
    CURLOPT_HTTPHEADER     => ['X-API-Key: ' . getenv('AHR_KEY')],
]);
$data = json_decode(curl_exec($ch), true)['data'];

const res = await fetch(
  'https://api.apihorseracing.com/v1/trainers/tr_2QVAXT3/owners',
  { headers: { 'X-API-Key': process.env.AHR_KEY } }
);
const { meta, data } = await res.json();

import os, requests

r = requests.get(
    "https://api.apihorseracing.com/v1/trainers/tr_2QVAXT3/owners",
    headers={"X-API-Key": os.environ["AHR_KEY"]},
).json()

Response

200 OK application/json harvested 8 days ago

{
    "meta": {
        "request_id": "1705ef2f2ab86a31",
        "data_as_of": "2026-09-12T05:10:27+00:00",
        "plan": "analyst",
        "window": "2017 → upcoming",
        "count": 3
    },
    "data": {
        "trainer_id": "tr_2QVAXT3",
        "trainer": "Ben Clarke",
        "window": {
            "from": null,
            "to": null,
            "note": "The whole archive. Your plan sets no date limit."
        },
        "overall": {
            "runs": 425,
            "priced": 425,
            "first": 54,
            "second": 63,
            "third": 59,
            "fourth": 38,
            "win_pct": 0.1271,
            "top3_pct": 0.4141,
            "expected_wins": 48.39,
            "a_e": 1.116,
            "a_e_range": [
                0.818,
                1.413
            ],
            "a_e_beats_market": false,
            "significant": false,
            "low_sample": false,
            "pl_1pt": -90.11,
            "roi_pct": -21.2
        },
        "by": "owner",
        "owner": [
            {
                "owner": "Mr Adrian Paterson",
                "runs": 62,
                "priced": 62,
                "first": 10,
                "second": 6,
                "third": 8,
                "fourth": 4,
                "win_pct": 0.1613,
                "top3_pct": 0.3871,
                "expected_wins": 7.61,
                "a_e": 1.315,
                "a_e_range": [
                    0.5,
                    2.129
                ],
                "a_e_beats_market": false,
                "significant": false,
                "low_sample": false,
                "pl_1pt": 8.89,
                "roi_pct": 14.35
            },
            {
                "owner": "Sue & Clive Cole & Ann & Tony Gale",
                "runs": 35,
                "priced": 35,
                "first": 4,
                "second": 6,
                "third": 4,
                "fourth": 4,
                "win_pct": 0.1143,
                "top3_pct": 0.4,
                "expected_wins": 3.49,
                "a_e": 1.146,
                "a_e_range": [
                    0.023,
                    2.269
                ],
                "a_e_beats_market": false,
                "significant": false,
                "low_sample": true,
                "pl_1pt": -13.33,
                "roi_pct": -38.1
            },
            "… 1 more"
        ]
    }
}

A real response from /v1/trainers/tr_2QVAXT3/owners?limit=3, captured by calling the live API rather than written by hand.

Response fields

Each field is described once and rendered on every endpoint that returns it, so the wording cannot drift between pages.

Field	Type	What it is
trainer_id	string	Opaque trainer identifier.
trainer	string	Trainer name.
window	string	How far back and forward that plan can read.
runs	integer	Rides in the slice, priced or not.
priced	integer	Rides carrying a starting price. A/E and the profit figures use these; runs is the wider count.
first	integer	Wins.
second	integer	Seconds. Positions are returned separately so you apply your own place terms.
third	integer	Thirds.
fourth	integer	Fourths.
win_pct	number	Wins over runs. The number everyone quotes and the one that tells you least.
top3_pct	number	First, second or third over runs. Not a place strike rate; place terms vary.
expected_wins	number	Wins the market implied, summed over the slice.
a_e	number	Actual wins over expected. Above 1.00 means winning more often than the prices said.
a_e_range	array	Ninety five percent interval on A/E. If it spans 1.00 the figure is not evidence of anything.
a_e_beats_market	boolean	True only where the whole interval sits above 1.00.
significant	boolean	Whether the interval excludes 1.00 in either direction.
low_sample	boolean	Fewer than five expected wins. Treat A/E as noise.
pl_1pt	number	One point on every runner, settled at starting price.
roi_pct	number	Level stakes return. Backing everything loses more than the book margin, because equal stakes overweight the longshots.
owner	string	Registered owner as published.

Errors this endpoint returns

Code	Status	When
unauthorized	401	No key, or one we do not recognise. Check the header name and that the key has not been rotated from your account page.
upgrade_required	403	The endpoint returns computed statistics and your plan does not include them. The body names every plan that does reach it, so you never have to look it up.
not_found	404	The identifier is well formed but nothing has it. Distinct from invalid_id, which means the identifier itself is wrong.
invalid_id	422	The prefix does not match the kind of thing the path expects, or the identifier is malformed. A horse id passed where a race is wanted lands here rather than returning the wrong race.
invalid_param	422	A date that is not YYYY-MM-DD, a by= dimension we do not have, or a cursor that did not come from us. The message names the parameter.
rate_limited	429	Past your per-minute rate. Retry-After is set, and X-RateLimit-Remaining tells you where you stand on every successful response too.
server_error	500	Ours, not yours. Every response carries a request_id; quote it and we can find the exact request.

Run it live

A real request from your browser straight to api.apihorseracing.com with your own key. Nothing is proxied and nothing is logged by this page.

Your API key

Remembered in this browser so you do not paste it on every page.

trainer_id

min_runs optional

What this is for

The yard split by who owns the horse. A proxy for something the data does not record directly: which horses in a yard are the expensive ones.

A large owner's horses in a mixed yard are usually its best, and they are often priced as such. Where they are not, the A/E shows it.

Owners are identified by name here, because the source publishes no owner identifier at all. Syndicates and partnerships appear as they are written, and the same people under two forms of a name are two owners to us. This endpoint is a shape to explore rather than a clean dimension.

Common uses

Spotting the good horses in a yard

The owner rows with the best A/E are usually where the money is.

Reading a debut

A first-time runner in familiar colours at a yard is more informative than the horse's own record, which is empty.

Notes

Fewer owners are named than horses run. Where the source published none the runner is excluded from this breakdown rather than bucketed as unknown.