As of November 7, 2026, 2 holders' latest Schedule 13D or 13G filings report owning 5% or more of Tempus AI, Inc. The largest reported stake is Eric Paul Lefkofsky's, at 24%. 9 filings are on record since October 31, 2025 (Schedule 13G/A, February 10, 2026).
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Key facts
- · Reporting person: ARK Investment Management LLC · Sole voting: 8,161,270 · Shared voting: 124,106 · Sole dispositive: 8,607,836 · Shared dispositive: 0 · SCHEDULE 13G/A, 2026-11-06
- · Reporting person: Bradley A. Keywell · Sole voting: 0 · Shared voting: 6,071,744 · Sole dispositive: 0 · Shared dispositive: 6,071,744 · SCHEDULE 13G/A, 2026-10-28
- · Holder: Baillie Gifford & Co · Percent: 5% · SCHEDULE 13G/A
- · Holder: The Vanguard Group · Percent: 0% · SCHEDULE 13G/A
- · Holder: ARK Investment Management LLC · Percent: 5.44% · SCHEDULE 13G
Tempus AI, Inc. has 9 Schedule 13D or 13G filings on record since 2025-10-31. 2 holders' latest filing reports 5% or more of common stock. Each figure below is the holder's own, as filed, with the filing linked.
Holders
| Holder | Percent | Shares | Latest | Event date |
|---|---|---|---|---|
| 24% | 42,767,997 | SCHEDULE 13G/A, 2026-02-10 | 2025-12-31 | |
| Baillie Gifford & Co | 5% | 8,649,356 | SCHEDULE 13G/A, 2026-05-07 | 2026-03-31 |
| ARK Investment Management LLC | 4.91% | 8,607,836 | SCHEDULE 13G/A, 2026-11-06 | 2026-10-31 |
| Red Sky Ventures LLC | 4.7% | 8,059,321 | SCHEDULE 13G/A, 2025-11-13 | 2025-09-30 |
| 3.46% | 6,071,744 | SCHEDULE 13G/A, 2026-10-28 | 2025-06-18 | |
| The Vanguard Group | 0% | 0 | SCHEDULE 13G/A, 2026-03-27 | 2026-03-13 |
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Keep reading
More on Tempus AI, Inc. and the records around it.
Tempus AI, Inc. elsewhere on the record
Companies that share a holder
- ARK Investment Management LLC also filed stake reports on 20 other companies: 10x Genomics, Inc. (Oct 2026), Twist Bioscience Corp (Sep 2026), 908 Devices Inc. (Aug 2026)
- BAILLIE GIFFORD & CO also filed stake reports on 39 other companies: QXO, Inc. (Oct 2026), Reddit, Inc. (Oct 2026), Samsara Inc. (Oct 2026)
- The Vanguard Group also filed stake reports on 2384 other companies: BellRing Brands, Inc. (Sep 2026), CAL-MAINE FOODS INC (Sep 2026), FTAI Aviation Ltd. (Sep 2026)
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What the Full Report on Tempus AI, Inc. covers
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Which Company This Is
What They Do, And How The Money Works
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Voting and dispositive power, as filed
| Reporting person | Sole voting | Shared voting | Sole dispositive | Shared dispositive | Filing |
|---|---|---|---|---|---|
| ARK Investment Management LLC | 8,161,270 | 124,106 | 8,607,836 | 0 | SCHEDULE 13G/A, 2026-11-06 |
| Catherine D. Wood | 0 | 8,285,376 | 0 | 8,607,836 | SCHEDULE 13G/A, 2026-11-06 |
| Bradley A. Keywell | 0 | 6,071,744 | 0 | 6,071,744 | SCHEDULE 13G/A, 2026-10-28 |
| Bk Tl21 LLC | 2,213,198 | 0 | 2,213,198 | 0 | SCHEDULE 13G/A, 2026-10-28 |
| The Keywell Foundation Inc | 357,900 | 0 | 357,900 | 0 | SCHEDULE 13G/A, 2026-10-28 |
| Churchill Investments 21 LLC | 3,305,486 | 0 | 3,305,486 | 0 | SCHEDULE 13G/A, 2026-10-28 |
The latest filing identifies Tempus AI, Inc. by CUSIP 88023B103 and gives its principal executive office as 600 West Chicago Avenue, Suite 510, Chicago, IL 60654 (SCHEDULE 13G/A, 2026-11-06).
Timeline
| Filed | Holder | Percent | Filing |
|---|---|---|---|
| 2025-10-31 | The Vanguard Group | 5.59% | SCHEDULE 13G |
| 2025-11-12 | Baillie Gifford & Co | 5.8% | SCHEDULE 13G/A |
| 2025-11-13 | Red Sky Ventures LLC | 4.7% | SCHEDULE 13G/A |
| 2026-02-10 | Eric Paul Lefkofsky | 24% | SCHEDULE 13G/A |
| 2026-03-06 | ARK Investment Management LLC | 5.44% | SCHEDULE 13G |
| 2026-03-27 | The Vanguard Group | 0% | SCHEDULE 13G/A |
| 2026-05-07 | Baillie Gifford & Co | 5% | SCHEDULE 13G/A |
| 2026-10-28 | Bradley A. Keywell | 3.46% | SCHEDULE 13G/A |
| 2026-11-06 | ARK Investment Management LLC | 4.91% | SCHEDULE 13G/A |
Questions about who owns Tempus AI, Inc.
Who owns Tempus AI, Inc.?
On this page, 2 holders' latest ownership filings report 5% or more of Tempus AI, Inc.: Eric Paul Lefkofsky (24%, Schedule 13G/A, filed 2026-02-10) and Baillie Gifford & Co (5%, Schedule 13G/A, filed 2026-05-07).
Who are the largest shareholders of Tempus AI, Inc.?
By the share each holder's latest filing reports, the largest holders of Tempus AI, Inc. on this page are Eric Paul Lefkofsky (24%) and Baillie Gifford & Co (5%).
When did Eric Paul Lefkofsky buy into Tempus AI, Inc.?
The filings give report dates, not purchase dates. The earliest filing from Eric Paul Lefkofsky on this page is the Schedule 13G/A, filed 2026-02-10, reporting 24%. That earliest filing is itself an amendment, which updates an earlier report.
Is this an audit or a full list?
Neither. The ownership list on this page covers only Schedule 13D and 13G filings, which holders make once they own 5% or more of a class of shares (an amendment can report a stake that has since fallen below 5%); 9 such filings are shown here. It is not an audit and not a full cap table: holders who never reached 5% are not listed, and a stake can change after its latest filing.
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Where this comes from
Anyone who comes to own more than 5% of a class of a listed company's voting shares has to tell the SEC. A holder who may seek to change or influence the company files Schedule 13D, and has to say in Item 4, "Purpose of Transaction", what it intends to do. A holder with no such intent, such as many index and passive funds, may file the shorter Schedule 13G. Both are amended when the stake changes, including when it falls below 5%.
Every row here is one of those filings, linked to the filing itself. Percentages and share counts are exactly as the holder filed them, for the holder the filing names; an amendment showing a lower figure is shown as filed. Item 4 text is quoted word for word. Where a 13D's Item 4 contains a sentence stating a definite intent to influence the company, that sentence is marked and quoted; the page does not describe the holder or its motives beyond the words it filed. Nothing here is investment advice.