SEC Filing Analysis: Tempus AI, Inc. (TEM)

Executive Summary

• Trading Significance: High
• Key Takeaway: Major institutional investor Baillie Gifford & Co. has reported maintaining a significant 5.75% passive ownership stake in Tempus AI, Inc., valued at approximately $731.5 million.
• Market Impact: This filing reinforces the presence of a large, stable institutional holder, which is generally viewed as a positive signal for market stability and long-term confidence in the company's prospects.

Company Information

Field	Value
Company	Tempus AI, Inc.
Ticker Symbol	TEM
CIK	0001717115
Industry	Services-Computer Programming, Data Processing, Etc.

Insider Information

Field	Value
Name	BAILLIE GIFFORD & CO
CIK	0001088875
Title/Position	Investment Adviser
Relationship	>5% Owner (Institutional)

Transaction Details

Field	Value
Form Type	SCHEDULE 13G/A
Event Date	2025-09-30
Transaction Code	N/A
Security Type	Class A Common Stock
Shares Involved	Not specified (change in holding level)
Price Per Share	N/A
Total Value	N/A
Shares Owned After	9,692,441
Ownership Type	Indirect

Financial Impact Assessment

Holding Materiality

Metric	Value
Total Holding Value (est.)	~$731,500,000
% of Market Cap	5.75%
Shares Held	9,692,441
% of Shares Outstanding	5.75%
Post-Transaction Ownership	9,692,441 shares (5.75% of outstanding)
Materiality Assessment	Highly Significant

Impact Evaluation

• Market Cap Context: Tempus AI is a large-cap company with a market capitalization of $12.73 billion. A stake worth over $730 million represents a substantial capital allocation from Baillie Gifford, underscoring a high level of conviction.
• Ownership Concentration: A 5.75% stake makes Baillie Gifford one of the company's largest shareholders. Such concentrated ownership by a reputable institution can lend credibility and stability to the stock.
• Dilution Impact: Not applicable. This filing reports a change in an existing holding, not the issuance of new shares.
• Transaction Significance: While this is an amendment and not a new position, the reaffirmation of a holding greater than 5% of a multi-billion dollar company is highly significant. It indicates that a sophisticated, long-term-oriented investor continues to see value in the company at its current valuation.

Market Impact Analysis

Stock Impact Prediction

• Direction: Neutral to Positive
• Reasoning: This is a passive investment filing (13G), not an activist one (13D). It does not signal an intent to influence the company. However, the market generally interprets continued ownership by a respected firm like Baillie Gifford as a positive, long-term endorsement.

Volume & Sentiment

• Expected Volume Impact: Low. 13G filings typically do not cause significant short-term trading volume unless the change in ownership is dramatic and unexpected.
• Sentiment Indicator: Bullish. The filing confirms that a major institutional investor with a long-term focus maintains a significant position, which is a bullish signal for overall market sentiment towards the stock.

Investment Insights

Positive Market Indicators

• Strong Institutional Conviction: A holding of this size demonstrates significant belief in the company's business model and future growth prospects.
• Passive Stake: The filing under Rule 13d-1(b) confirms the shares are held for investment purposes, not to change or influence control, suggesting alignment with long-term shareholder value creation.

Risk Factors

• Concentration Risk: While currently a positive, a future decision by Baillie Gifford to reduce or exit its large position could create significant selling pressure on the stock.

Key Takeaways

1. Major Institutional Backing: Baillie Gifford, a globally recognized investment manager, holds a substantial 5.75% stake in Tempus AI.
2. Significant Holding Value: The position is valued at approximately $731.5 million, representing a major allocation and a strong vote of confidence.
3. Passive, Long-Term Signal: As a Schedule 13G filer, Baillie Gifford's stake is passive, reinforcing a long-term investment thesis rather than short-term activism.

Additional Context

Transaction Notes

• This Schedule 13G/A is an amendment to a prior filing, indicating an update to the firm's beneficial ownership as of September 30, 2025. The filing itself does not detail the specific purchases or sales that resulted in the current ownership level.