(Reuters) -Shein is working towards a listing in Hong Kong, as Chinese regulators did not approve the online fast-fashion retailer's proposed IPO in London, according to three sources with knowledge of the matter.

Here's a timeline of the Singapore-headquarted company's attempts to go public and the various setbacks it has encountered.

Shein had moved its headquarters from China to Singapore in 2022, while its supply chains and warehouses largely remain in China.

JANUARY 2022

Shein revives plans to list in New York. Founder Chris Xu considers changing his citizenship to bypass proposed tougher rules for offshore IPOs in China, two sources told Reuters.

It had first started preparing for a U.S. IPO about two years prior to this but shelved the plan partly due to unpredictable markets amid rising U.S.-China tensions, sources told Reuters.

FEBRUARY 2022

Shein puts its U.S. listing plans on hold due to volatile capital markets amid Russia's attack on Ukraine, sources say.

MARCH 2023

Shein was set to raise around $2 billion in a new funding round. The company was aiming for a U.S. listing in the second half of 2023, sources said.

MAY 2023

A bipartisan group of two dozen U.S. representatives calls on the Securities and Exchange Commission to halt Shein's IPO, until it verifies that Shein is not using forced labor, according to a letter seen by Reuters.

JUNE 2023

Shein makes moves to register with regulators for an IPO in New York, people familiar with the matter said.

JULY 2023

Shein was working with at least three investment banks about a potential U.S. IPO and was in talks with the NYSE and Nasdaq, sources said.

NOVEMBER 2023

Shein targets a valuation of as much as $90 billion for an eventual U.S. IPO, Bloomberg News reported.

The fashion company confidentially files to go public in the United States, according to Reuters sources.

U.S. lawmakers once again demand proof that Shein's $5 t-shirts and $10 sweaters were not being produced using forced labor.

DECEMBER 2023

Shein held talks with the London Stock Exchange about the possibility of a public listing in the United Kingdom, Sky News reported, citing sources.

JANUARY 2024

Shein seeks Beijing's nod to go public in the U.S. to comply with new listing rules for local firms, two sources told Reuters.

FEBRUARY 2024

Republican Senator Marco Rubio asks the U.S. SEC to block Shein's New York listing bid unless the company makes additional disclosures about its business operations and "the serious risks of doing business" in China.

Jeremy Hunt, British Finance Minister at the time, held talks with Shein's Executive Chairman Donald Tang, and the fast-fashion chain is keen to list in London, a UK government source told Reuters.