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By Shashwat Chauhan and Jaspreet Singh

June 18 (Reuters) - Shares of SpaceX dropped more than 6% on Thursday, as the post-IPO frenzy that briefly placed Elon ‌Musk's rockets-to-AI firm among the world's top five most valuable companies appeared ‌to fizzle out.

The stock was last down 6.5% at $178.50, after falling nearly 5% in the last session. It ​was still more than 30% above its $135 offering price.

If the losses persist, SpaceX's market value of $2.52 trillion would shrink by more than $150 billion on Thursday.

"Given the magnitude of the IPO and the strong initial performance, some degree of profit-taking is not surprising," IPOX Schuster analyst ‌Kat Liu said.

"This has been ⁠a particularly eventful and shortened trading week for the largest IPO in history," she added.

Shares of other U.S. space companies were also ⁠down. Rocket Lab and Planet Labs dropped around 3%, while AST SpaceMobile and Intuitive Machines declined around 7% and 3%, respectively.

Retail investors bought up SpaceX shares aggressively for the last three ​sessions, with ​a total net purchase of over $300 million. ​Activity, however, was muted on Thursday, ‌with only $9.1 million worth of net purchases noted as of 2:00 p.m. ET, according to Vanda Research.

Due to its relatively small public float and high valuation, analysts and portfolio managers have cautioned investors to anticipate volatility early in SpaceX's life as a public company.

SpaceX's valuation surged past $2 trillion following its blockbuster Nasdaq debut last week. Its shares soared ‌in their first two days of trading before ​giving up some gains as investors assessed whether the ​company's rich valuation can be ​justified by its costly AI push.

SpaceX said on Tuesday it would buy ‌Anysphere, the startup behind the popular ​AI coding agent Cursor, ​for $60 billion in stocks to boost its presence in the lucrative enterprise AI tools market.

The company's bankers are preparing to meet investors as early as next ​week to discuss a bond ‌offering of at least $20 billion, a source said on Thursday, as the company ​seeks funding for its ambitious AI expansion.

(Reporting by Shashwat Chauhan and Jaspreet ​Singh in Bengaluru; Editing by Joyjeet Das)