Rishi Sunak breached parliament’s code of conduct by failing to properly declare his wife’s shareholding in a childcare company which stood to benefit from new government policy but did so inadvertently, parliament’s standards watchdog has concluded. An investigation was launched in April by Daniel Greenberg, parliament’s commissioner for standards, into a potential breach of transparency rules relating to his links to the firm Koru Kids, in which his wife, Akshata Murty, is an investor. Publishing the conclusions of his investigation on Wednesday, Greenberg said Sunak should have declared the shareholding when being questioned on the policy by the liaison committee of senior crossbench MPs on 28 March. But he said he was satisfied that the prime minister had confused the rules on registering and declaring interests. Parliament’s commissioner for standards said: “Having considered the information available to me, I have decided that the breach of the code appears to have been inadvertent. I confirm that the matter is now closed.” Greenberg, who can refer lawmakers who breach the rules to a committee that has the power to suspend or expel them from parliament, added that he had instead decided to conclude the inquiry via a rectification procedure. Rectification procedures can include offering advice requiring the individual concerned to apologise or to correct the register of members’ financial interests. In a letter to Greenberg, published by the commissioner’s office, Sunak apologised for confusing the language of registration and declaration. The Conservative leader said: “I am pleased that this matter will now be concluded by way of rectification.” During Sunak’s appearance before the liaison committee of senior crossbench MPs, the Labour MP Catherine McKinnell asked him about a childcare initiative in the recent budget. Koru Kids was among six private childcare providers set to benefit from a pilot scheme proposed in the budget to incentivise people to become childminders. When McKinnell asked Sunak whether he had anything to declare in relation to the scheme, he replied: “No, all my disclosures are declared in the normal way.” It later emerged that bosses from the company attended a Downing Street reception hours after Sunak’s appearance before the committee. A subsequent letter to the committee from Sunak said that because he was being asked questions in his capacity as prime minister, the relevant register of interests is that for ministers, and that his interest in Koru Kids had been “rightly declared”. However, while the separate register of MPs’ interests is updated every fortnight, the register for ministers, supposedly published twice a year, had not appeared for nearly 12 months at the time. The initiation of the investigation in April was the third such probe into the prime minister, who has been fined by police for breaching Covid rules and for not wearing a seatbelt.