How much is Anthony Horowitz Worth? Anthony Horowitz Net Worth in 2026

By the Alux Research Team. How we estimate net worth

Anthony Horowitz’s net worth is estimated at $20 million as of November 2026. Years ago he told a newspaper he had “a horror of anything to do with investments or shares.” His main company now holds £1.54 million in investments, and it files accounts anyone can read, which puts his fortune on firmer ground than most authors’.

Net worth	$20 million (estimate, range $14 million to $35 million)
Estimated annual income	About $1.5 million before tax (our assumption, informed by filed company balance sheets)
Born	April 5, 1955, Stanmore, England (age 71)
Country	United Kingdom
Known for	Alex Rider, Magpie Murders, Foyle’s War, James Bond and Sherlock Holmes novels
Main income sources	Book royalties, television writing and production, property

How much is Anthony Horowitz worth in 2026?

Our figure is $20 million, in a range of $14 million to $35 million, converted at $1.34 to the pound, from the rate shown on November 3, 2026. About half of it rests on filed UK balance sheets. The rest (savings, homes and the value of his rights) is assumption, and the table says so.

Public estimates we saw in search listings run from about $15 million to about £100 million. We found none citing the company accounts, which are free to read. The filings can’t show what he has spent or paid out, which is why our range stays wide.

How we got to $20 million

Source	Our estimate	What it rests on
Stormbreaker Productions Limited	$8.1 million	Accounts to August 31, 2025 show net assets of £6,059,973. He holds 75 percent or more of the shares.
Gameslayer Limited	$1.8 million	Accounts to April 30, 2025 show net assets of £1,343,940. He holds 75 percent or more of the shares.
Nightshade Limited	$0	Net assets of £3,879,953, or $5.2 million, but his two sons each hold 25 to 50 percent of the shares while he holds the votes. We credit him none of it and explain below.
Personal savings and pensions	$4 million	Assumption. £150,000 a year saved outside the companies for 20 years, or £3 million. He has described cash accounts and pensions, without amounts.
Homes, his half	$2.4 million	Assumption. A Clerkenwell penthouse at £3 million and the Suffolk place at £600,000, split with his wife. He paid a little over £1.5 million for the first and £250,000 to £300,000 for the second. Those details come from an old column, and we can’t confirm he still owns either.
Book and TV rights	$4 million	Assumption. Nothing like this appears on the balance sheets. We assume £500,000 a year of backlist income, valued at six times, or £3 million.
Total	$20 million	The rows sum to about $20.3 million.

Where the filed money sits

Add the three balance sheets and you get net assets of £11.28 million. Our calculation: cash at Stormbreaker (£4,674,767) and Nightshade (£3,640,295) comes to £8.32 million, equal to 74 percent of that total. Gameslayer doesn’t itemize its cash, so the true share could be higher. For someone who once listed high-interest accounts as his only investment, that fits.

Two details do not fit quite so neatly. Stormbreaker now carries £1,543,886 of “other investments”, and the filing doesn’t say what they are. It has also lent Nightshade £1,163,652 for a commercial property, charging about 1 percent interest (£11,521 on £1,152,131). That is a good rate if you can get it, and he is the director on both sides of the loan.

The money has not all been drawn. The top UK dividend rate is 39.35 percent. If he pulled the £7.40 million we credit him out of Stormbreaker and Gameslayer as dividends at that rate, about £2.91 million would go in tax, by our math, taking about $3.9 million off the headline. We leave it gross because he doesn’t have to do that, and may never.

Why a third of it is not in his column

Nightshade Limited was set up in October 2017. Its filings show 10 ordinary shares, 50,000 A shares and 50,000 B shares, and the A and B holders have no vote. Records list him with control of the votes and his sons, Cassian and Nicholas, with the shareholdings. On that structure, £3.88 million of £11.28 million, or 34 percent of the filed money, looks like it is already moving to the next generation. A director can set different dividends by share class, so we can’t rule out that he draws from it. We don’t assume he does.

The motorbike and the bearer bonds

In a money column for The Telegraph, reprinted on his own site and written when he was 52, he said that at 17 he carried half a million pounds in bearer bonds across London on a motorbike and never learned why. His father later went bankrupt twice. At 18 he came into £1,000, and his father told him to invest it in his company. His father went bankrupt a week later.

That history shows up in how he behaves with money. He told the paper he has never been in debt, won’t say what he earns and considers his books his pension. He sold a Crouch End house for around £1.5 million in 2006, five times the £300,000 he paid, and then, he said, made a loss on the Clerkenwell flat because they bought just before prices fell. He and his wife, Jill Green, keep completely separate finances, with no joint account. She is also company secretary at Stormbreaker.

The Alex Rider numbers are publisher claims and they wobble: more than 19 million copies on his own site in November 2025, over 21 million on a 2024 festival listing. In the old column he said a Potter-style film run could have made him embarrassingly rich, but there would probably be only one film. There was one, in 2006. His screen credits then did the steady work: Foyle’s War from 2002 to 2015, plus Magpie Murders, and he has two Holmes and three Bond commissions behind him.

The most recent hard money dates are 2026 ones. All three sets of accounts were signed on January 13, 2026. The two larger companies filed on May 5, 2026, and both also shortened their accounting year to end on April 30, 2026. Those next accounts will be the first test of this figure. A major screen sale for the Hawthorne books or A Deadly Episode, his 2026 novel, would show up there, and so would a large dividend.

Anthony Horowitz net worth FAQ

How much did Anthony Horowitz make from Alex Rider?

He has never said. The series has sold 19 million to 21 million copies by publisher counts. At an assumed 50 pence a copy, that is about £10 million before tax, which we offer as a rough guide only.

What companies does Anthony Horowitz own?

Records list him as director of Stormbreaker Productions, Gameslayer and Nightshade. He holds 75 percent or more of the first two. His sons hold shares in Nightshade while he keeps the votes.

How much cash do his companies hold?

Stormbreaker held £4.67 million at August 31, 2025 and Nightshade held £3.64 million. Gameslayer reported £1.44 million of current assets without itemizing them.

Does Anthony Horowitz invest in shares?

He said in an old newspaper column that he never had. His company now shows £1.54 million of investments of an unstated type, so this may have changed.

How old is Anthony Horowitz?

He was born on April 5, 1955, which makes him 71. He has an OBE from 2014 and a CBE from 2022, both for services to literature.

Related profiles

• J.K. Rowling
• James Patterson
• George R.R. Martin
• Malcolm Gladwell

How we estimate net worth

Our estimates are based on public reporting, company valuations, and deal and earnings figures all compiled in an internal valuation model. They are approximate, and figures change over time as new information emerges.

Last updated: November 2026.

Photo: Edwardx / Wikimedia Commons, CC BY-SA 4.0, cropped