More than a thousand people have attended a protest against a legal ruling that biology defines whether or not a person is a woman.
Campaigners walked through Cardiff city centre as part of the trans liberation march.
Supreme Court judges ruled on Wednesday that "woman and sex in the Equality Act 2010 refer to a biological woman and biological sex".
In their ruling, the judges stressed that the law still protects transgender people.
Protest organisers said the decision was a "backwards step" for equality.
"I joined the Trans Support March in Cardiff today to stand with our trans community across Wales and the UK, following the Supreme Court ruling," said Matthew Lloyd.
"Trans rights are human rights and we must fight any attempt to roll them back. Equality, safety, and dignity for trans people are not optional, they are non-negotiable."
