Short answer: The Daily Mirror is published by Mirror Group Newspapers (MGN), which is owned by Reach plc — the largest commercial newspaper group in the UK and Ireland, publisher of more than 120 print and online brands. Reach was called Trinity Mirror from 1999 until it rebranded in 2018. Is the Mirror left wing? Yes, openly and proudly. It is the one British national tabloid that has backed the Labour Party at essentially every election since 1945, and unlike some rivals it has never pretended otherwise. * The pro-Labour line is not a recent marketing choice; it is the paper's whole identity. In the 1945 general election the Mirror rallied working-class and military voters against Winston Churchill's Conservatives under the slogan "Forward with the People," and historians credit it with helping deliver Clement Attlee's Labour landslide. The loyalty has held for eight decades. It endorsed Labour in 2019 "to protect the NHS, end poverty and for a kinder Britain," and in a "Voice of the Mirror" editorial on May 24, 2024 it declared that "a Labour government is more crucial than ever for the new generation" (Press Gazette, 2024). When most of Fleet Street swung to Labour in 2024, the Mirror had been there the whole time. * So the bias question answers itself — but the more useful question for a media-criticism site is: has the Mirror been reliable? On that score it carries one of the heaviest legal verdicts in modern British journalism. In December 2023 the High Court ruled that MGN had engaged in "widespread and habitual" phone hacking and unlawful information-gathering, and awarded Prince Harry £140,600 in damages after finding that 15 of 33 sample articles were the product of illegal methods (The Conversation, 2023). It was not an isolated ruling: Reach has paid out well over £100 million in hacking-related damages and costs across hundreds of claims. The Mirror's politics were on the left; its newsroom methods, a court found, were flatly illegal. * Ownership-wise, Reach plc is different from the family-dynasty model of the Mail or the Murdoch empire. It is a publicly listed company on the London Stock Exchange, with no single controlling family — shares are held by institutional investors and asset managers, and no billionaire sits astride it dictating the line. That matters: the Mirror's Labour stance comes from tradition and readership, not from a proprietor's personal politics. The same group also owns the Sunday Mirror, the Daily Record in Scotland, the Sunday People and the Express titles — a stable that mixes left-leaning and right-leaning mastheads under one corporate roof, which tells you the company sells identities to audiences as much as it preaches them. * There is a real tension in all this. The Mirror campaigns hard on working-class issues — the NHS, pensioners, in-work poverty — and that pro-underdog instinct is genuine and long-running. But the same company chased circulation through phone hacking on an industrial scale in the 2000s, and only the courts, not the newsroom, brought it to account. "Left wing" and "trustworthy" are not the same axis, and the Mirror is a clean example of why you have to ask both questions separately. * On our least-biased-news ranking we grade outlets by who owns them and how honest they are about it, and the Mirror scores well on transparency: a listed company, no hidden proprietor, and an editorial line it has never disguised. Read it knowing exactly what it is — a Labour-backing tabloid with a real campaigning streak and a courtroom-documented history of cutting corners. Trust the cause, check the sourcing.