This is a summary of the Nokia Corporation Financial Report for Q4 and full year 2023 published today. Nokia only publishes a summary of its financial reports in stock exchange releases. The summary focuses on Nokia Group's financial information as well as on Nokia's outlook. The detailed, segment-level discussion will be available in the complete financial report hosted at www.nokia.com/financials. A video interview summarizing the key points of our Q4 results will also be published on the website. Investors should not solely rely on summaries of Nokia's financial reports and should also review the complete reports with tables.
PEKKA LUNDMARK, PRESIDENT AND CEO, ON Q4 AND FULL YEAR 2023 RESULTS
In 2023 we saw a meaningful shift in customer behavior impacting our industry driven by the macro-economic environment and high interest rates along with customer inventory digestion. This led to our full year net sales declining by 8% in constant currency. Proactive action across our organization meant we were able to protect our profitability while continuing to invest in R&D and we delivered a comparable operating margin of 10.7% for the full year. This was a resilient performance considering the challenging environment and lower contribution from our high margin patent licensing business as some renewals remained outstanding.
Looking specifically at the fourth quarter those same factors drove a net sales decline of 21% y-o-y in constant currency. Encouragingly we saw improvements in our gross margin across several of our businesses which, combined with continued cost discipline, helped us to deliver a strong comparable operating margin of 14.8%. In addition, we have seen a significant improvement in order intake in the fourth quarter, particularly in Network Infrastructure, indicating at least some improvement in the overall spending environment.
We delivered well in 2023 against our strategic pillar of growing in Enterprise with 16% net sales growth in constant currency and this customer segment now accounts for over 10% of our group net sales. Growth in the fourth quarter was muted at -3% in constant currency as we faced a tough comparison period. We continue to have strong momentum in this segment and expect another year of double-digit growth in 2024.