The deep research logic is organized as follows: 

Okay, let's tackle this question: "Which companies in the automotive sector is Warren Buffett currently invested in?" 

First, I need to check the provided references and background information. The user is asking specifically about the automotive sector, so I should focus on any mentions of automotive-related stocks in Buffett's portfolio.

Looking through the references, I see that in Reference 3 (dated 2023-09-30), Buffett bought General Motors (GM) and Viacom. However, Reference 11 and 26 indicate that recent SEC filings (2024 Q4 and 2025) show no results for automotive sector holdings. Also, Reference 21 and 31 mention queries about GM and recent transactions, but the results are zero. 

Wait, Reference 17 (2025-01-21) mentions that Buffett sold all his GM shares in 2023. So, as of 2025, GM is no longer in his portfolio. Reference 5 (2023-09-29) talks about GM's performance but also notes the sale. 

Other references like 2, 4, 9-10, 28-30 discuss energy stocks (Chevron, Occidental) and others like VeriSign, but not automotive. Reference 32-34 (Q4 2024 filings) list top holdings as Apple, AXP, BAC, KO, CVX, etc., no automotive. 

So, based on the latest data (2024 Q4 and 2025), Buffett has no automotive sector holdings. The user's query might be expecting GM, but according to the references, he sold that position. 

I need to confirm this. Reference 17 explicitly states that Buffett sold all GM shares by the end of 2023. References 11 and 26 also show no results for automotive holdings in the latest filings. Therefore, the answer is that Buffett is not currently invested in any automotive sector companies. 

The user's profile mentions interest in tech and rare metals, but the question is about automotive. The answer should clearly state that there are no current automotive holdings, citing the