Oklo Inc.
OKLO- Exchange
- NYSE
- Industry
- Electric Services
- SEC CIK
- 0001849056
In the last 90 days, Oklo Inc. insiders filed 0 open-market purchases and 19 sales; 673 institutions reported holding it in 13F filings for Q2 2026, worth $4.27B in total; ARK Invest is the only superinvestor holding it.
Holders of 5% or more of OKLO
Holders whose latest Schedule 13D or 13G filing reports 5% or more of Oklo Inc., largest stake first. The change is against the holder's previous filing.
| Holder | Latest form | Stake | Change | First filed | Latest filing | Filing |
|---|---|---|---|---|---|---|
| DeWitte Jacob | 13D/A | 16.20%23.9M shares | −2.00 ppfrom 18.20% | Apr 2, 20252 filings | Jul 2, 2025 | SEC |
| BlackRock, Inc. | 13G/A | 9.20%14.4M shares | +3.70 ppfrom 5.50% | Oct 17, 20252 filings | Jan 21, 2026 | SEC |
Stakes are as of each holder's latest filing. Holders whose last filing was in the old format (before December 18, 2024) have no stake on record and are not listed, and after an acquisition or delisting holders usually stop filing.
13D and 13G filings
13 Schedule 13D and 13G filings on Oklo Inc., newest first, including old-format filings without a stake.
| Filed (ET) | Filer | Form | Stake | Change | Event date | Filing |
|---|---|---|---|---|---|---|
| Mar 27, 202611:05 AM ET | Vanguard Group Inc | 13G/A | 0.00%0 shares | −7.85 ppfrom 7.85%Below 5% | Mar 13, 2026 | SEC |
| Jan 21, 202612:30 PM ET | BlackRock, Inc. | 13G/A | 9.20%14.4M shares | +3.70 ppfrom 5.50% | Dec 31, 2025 | SEC |
| Oct 31, 202511:04 AM ET | Vanguard Group Inc | 13G/A | 7.85%11.6M shares | +1.92 ppfrom 5.93% | Sep 30, 2025 | SEC |
| Oct 17, 20256:05 PM ET | BlackRock, Inc. | 13G | 5.50%8.08M shares | New | Sep 30, 2025 | SEC |
| Jul 29, 20252:13 PM ET | Vanguard Group Inc | 13G | 5.93%8.69M shares | New | Jun 30, 2025 | SEC |
| Jul 2, 20254:30 PM ET | DeWitte Jacoband 1 other | 13D/A | 16.20%23.9M shares | −2.00 ppfrom 18.20% | Jun 30, 2025 | SEC |
| Apr 4, 20255:05 PM ET | Altman Samuel H.and 4 others | 13D/A | 4.80%6.65M shares | −3.40 ppfrom 8.20%Below 5% | Mar 6, 2025 | SEC |
| Apr 2, 20254:20 PM ET | DeWitte Jacoband 1 other | 13D/A | 18.20%25.4M shares | – | Feb 5, 2025 | SEC |
| Feb 14, 20254:50 PM ET | Mithril II LPand 4 others | 13G/A | 0.00%0 shares | –Below 5% | Dec 31, 2024 | SEC |
| Feb 14, 20254:04 PM ET | Encompass Capital Advisors LLCand 1 other | 13G/A | 0.00%0 shares | –Below 5% | Dec 31, 2024 | SEC |
| Feb 14, 202511:44 AM ET | Data Collective IV, L.P.and 5 others | 13G/A | 4.40%5.38M shares | –Below 5% | Dec 31, 2024 | SEC |
| Feb 14, 20258:30 AM ET | AltC Sponsor LLCand 2 others | 13G/A | 0.41%500.0K shares | –Below 5% | Dec 31, 2024 | SEC |
| Dec 23, 20244:05 PM ET | Altman Samuel H.and 4 others | 13D | 8.20%9.97M shares | New | Nov 14, 2024 | SEC |
Form 144: proposed insider sales
Notices from officers, directors and other affiliates planning to sell Oklo Inc. shares.
No Form 144 notices for Oklo Inc. are on file.