# EDGAR Filing Document

**Accession Number:** 0002021433
**File Stem:** 0001193125-26-166799
**Filing Date:** 2026-4
**Character Count:** 11605
**Document Hash:** 10b6cec457b5cc0a2747e5808a70edc0
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001193125-26-166799.hdr.sgml**: 20260421

**ACCESSION NUMBER**: 0001193125-26-166799

**CONFORMED SUBMISSION TYPE**: SCHEDULE 13D/A

**PUBLIC DOCUMENT COUNT**: 1

**FILED AS OF DATE**: 20260421

**DATE AS OF CHANGE**: 20260421

**SUBJECT COMPANY**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** Oklo Inc.
- **CENTRAL INDEX KEY:** 0001849056
- **STANDARD INDUSTRIAL CLASSIFICATION:** ELECTRIC SERVICES [4911]
- **ORGANIZATION NAME:** 01 Energy & Transportation
- **EIN:** 000000000
- **STATE OF INCORPORATION:** DE
- **FISCAL YEAR END:** 1231

**FILING VALUES:**
- **FORM TYPE:** SCHEDULE 13D/A
- **SEC ACT:** 1934 Act
- **SEC FILE NUMBER:** 005-92698
- **FILM NUMBER:** 26879541

**BUSINESS ADDRESS:**
- **STREET 1:** 3190 CORONADO DR.
- **CITY:** SANTA CLARA
- **STATE:** CA
- **ZIP:** 95054
- **BUSINESS PHONE:** 650-550-0127

**MAIL ADDRESS:**
- **STREET 1:** 3190 CORONADO DR.
- **CITY:** SANTA CLARA
- **STATE:** CA
- **ZIP:** 95054

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** AltC Acquisition Corp.
- **DATE OF NAME CHANGE:** 20210303
**FILED BY**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** DeWitte Jacob
- **CENTRAL INDEX KEY:** 0002021433

**ORGANIZATION NAME:**

**FILING VALUES:**
- **FORM TYPE:** SCHEDULE 13D/A

**MAIL ADDRESS:**
- **STREET 1:** C/O OKLO INC.
- **STREET 2:** 3190 CORONADO DR.
- **CITY:** SANTA CLARA
- **STATE:** CA
- **ZIP:** 95054

### UNITED STATES SECURITIES AND EXCHANGE COMMISSION
**Washington, D.C. 20549**

## SCHEDULE 13D

### Under the Securities Exchange Act of 1934

**(Amendment No. 5)**

**Oklo Inc.**

*(Name of Issuer)*

**Class A Common Stock, par value $0.0001 per share**

*(Title of Class of Securities)*

**—**

*(CUSIP Number)*

**Albert Vanderlaan**<br>222 Berkeley Street<br>Suite 2000<br>Boston MA 02116<br>617-880-2219

*(Name, Address and Telephone Number of Person Authorized to Receive Notices and Communications)*

**04/21/2026**

*(Date of Event Which Requires Filing of this Statement)*

| **CUSIP No.** | **—** |

---

| | | | |
|:--|:--|:--|:--|
| 1 | Name of reporting person<br>**Jacob DeWitte** | Name of reporting person<br>**Jacob DeWitte** | |
| 2 | Check the appropriate box if a member of a Group (See Instructions)<br>[x] (a)<br>[ ] (b) | Check the appropriate box if a member of a Group (See Instructions)<br>[x] (a)<br>[ ] (b) | |
| 3 | SEC use only | SEC use only | |
| 4 | Source of funds (See Instructions)<br>**OO** | Source of funds (See Instructions)<br>**OO** | |
| 5 | Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)<br>[ ] | Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)<br>[ ] | |
| 6 | Citizenship or place of organization<br>**X1** | Citizenship or place of organization<br>**X1** | |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 7 | Sole Voting Power<br>**0.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 8 | Shared Voting Power<br>**21159091.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 9 | Sole Dispositive Power<br>**0.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 10 | Shared Dispositive Power<br>**21159091.00** |
| 11 | Aggregate amount beneficially owned by each reporting person<br>**21159091.00** | Aggregate amount beneficially owned by each reporting person<br>**21159091.00** | |
| 12 | Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)<br>[ ] | Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)<br>[ ] | |
| 13 | Percent of class represented by amount in Row (11)<br>**12.2%** | Percent of class represented by amount in Row (11)<br>**12.2%** | |
| 14 | Type of Reporting Person (See Instructions)<br>**IN** | Type of Reporting Person (See Instructions)<br>**IN** | |

---

| **CUSIP No.** | **—** |

---

| | | | |
|:--|:--|:--|:--|
| 1 | Name of reporting person<br>**Caroline Cochran** | Name of reporting person<br>**Caroline Cochran** | |
| 2 | Check the appropriate box if a member of a Group (See Instructions)<br>[x] (a)<br>[ ] (b) | Check the appropriate box if a member of a Group (See Instructions)<br>[x] (a)<br>[ ] (b) | |
| 3 | SEC use only | SEC use only | |
| 4 | Source of funds (See Instructions)<br>**OO** | Source of funds (See Instructions)<br>**OO** | |
| 5 | Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)<br>[ ] | Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)<br>[ ] | |
| 6 | Citizenship or place of organization<br>**X1** | Citizenship or place of organization<br>**X1** | |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 7 | Sole Voting Power<br>**0.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 8 | Shared Voting Power<br>**21159091.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 9 | Sole Dispositive Power<br>**0.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 10 | Shared Dispositive Power<br>**21159091.00** |
| 11 | Aggregate amount beneficially owned by each reporting person<br>**21159091.00** | Aggregate amount beneficially owned by each reporting person<br>**21159091.00** | |
| 12 | Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)<br>[ ] | Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)<br>[ ] | |
| 13 | Percent of class represented by amount in Row (11)<br>**12.2%** | Percent of class represented by amount in Row (11)<br>**12.2%** | |
| 14 | Type of Reporting Person (See Instructions)<br>**IN** | Type of Reporting Person (See Instructions)<br>**IN** | |

---

**Item 1. Security and Issuer**

**(a) Title of Class of Securities:**
Class A Common Stock, par value $0.0001 per share

**(b) Name of Issuer:**
Oklo Inc.

**(c) Address of Issuer's Principal Executive Offices:**
3190 Coronado Drive, Santa Clara, CA, 95054

This Amendment No. 5 (this "Amendment") amends and supplements the statement on Schedule 13D originally filed with the Securities and Exchange Commission (the "SEC") on May 16, 2024 (as amended to date, the "Schedule 13D"), which relates to the shares of Class A common stock, par value $0.0001 per share (the "Class A Common Stock"), of Oklo Inc., a Delaware corporation (the "Issuer").

**Item 5. Interest in Securities of the Issuer**

**(a)**
Item 5 of the Schedule 13D is hereby amended and restated in its entirety as follows:
The information contained on the cover pages is incorporated by reference to this Item 5.
The Reporting Persons may be deemed to beneficially own an aggregate of 21,159,091 shares of Class A Common Stock, representing 12.2% of the Class A Common Stock outstanding based upon 173,919,838 shares of Class A Common Stock outstanding as of April 6, 2026, as reported in the Issuer's proxy statement for its 2026 annual meeting of stockholders, as filed with the SEC on April 21, 2026.

**(b)**
The information contained on the cover pages is incorporated by reference to this Item 5.
The amounts reflected in the cover pages consist of (i) 691,533 shares of Class A Common Stock held of record by Mr. DeWitte, (ii) 656,483 shares of Class A Common Stock held of record by Mr. DeWitte's GRAT; (iii) 1,000,000 shares of Class A Common Stock held by Mr. DeWitte's GRAT No. 2; (iv) 506,807 shares of Class A Common Stock held by Mr. DeWitte's GRAT No. 3; (v) 7,851,901 shares of Class A Common Stock held by the Jacob DeWitte Family Trust; (vi) 658,039 shares of Class A Common Stock held of record by Ms. DeWitte (Cochran); (vii) 689,479 shares of Class A Common Stock held by Ms. DeWitte's (Cochran) GRAT; (viii) 1,000,000 shares of Class A Common Stock held by Ms. DeWitte's (Cochran) GRAT No. 2; (ix) 474,011 shares of Class A Common Stock held by Ms. DeWitte's (Cochran) GRAT No. 3; (x) 7,583,085 shares of Class A Common Stock held by the Caroline DeWitte Family Trust; (xi) 28,090 shares of Class A Common Stock vesting within 60 days of the date hereof pursuant to the terms of the restricted stock units held by Mr. DeWitte; and (xii) 19,663 shares of Class A Common Stock vesting within 60 days of the date hereof pursuant to the terms of the restricted stock units held by Ms. DeWitte (Cochran).
The amounts reported herein do not include any vested RSUs which are not expected to settle within 60 days of the date of this filing. Mr. DeWitte and Ms. DeWitte (Cochran) are married and, as a result, may be deemed to share beneficial ownership of each other's securities.

**(c)**
On March 2, 2026, the Reporting Persons disposed of an aggregate of 200,000 shares of Class A Common Stock in multiple transactions at prices ranging from $60.00 to $64.87 per share in a series of open-market transactions pursuant to their 10b5-1 Trading Plan entered into on March 31, 2025.
On March 12, 2026, the Reporting Persons acquired an aggregate of 220,140 shares of Class A Common Stock pursuant to the vesting of Restricted Stock Units. On March 13, 2026, an aggregate of 117,788 shares of Class A Common Stock were sold by the Reporting Persons to cover tax withholding obligations in connection with the vesting and settlements of the 220,140 Restricted Stock Units. The sale was to satisfy tax withholding obligations to be funded by a "sell to cover" transaction and does not represent a discretionary transaction by the Reporting Persons.
On March 30, 506,807 shares of Class A Common Stock were distributed for no consideration to the Jacob DeWitte Family Trust as an annuity distribution pursuant to the terms of the Jacob DeWitte GRAT. On March 31, 2026, the same 506,807 shares held by the Jacob DeWitte Family Trust were contributed for no consideration to the Jacob DeWitte GRAT No. 3 in connection with the funding of the Jacob DeWitte GRAT No. 3. Further on March 30, 2026, 474,011 shares of Class A Common Stock were distributed for no consideration to the Caroline DeWitte Family Trust as an annuity distribution pursuant to the terms of the Caroline Cochran GRAT. On March 31, 2026, the same 474,011 shares held by the Caroline DeWitte Family Trust were contributed for no consideration to the Caroline DeWitte GRAT No. 3 in connection with the funding of the Caroline DeWitte GRAT No. 3.
On April 1, 2026, the Reporting Persons disposed of an aggregate of 200,000 shares of Class A Common Stock in multiple transactions at prices ranging from $47.99 to $51.79 per share in a series of open-market transactions pursuant to their 10b5-1 Trading Plan entered into on March 31, 2025.
The Reporting Persons undertake to provide, upon request by the staff of the SEC, the Issuer, or a security holder of the Issuer, full information regarding the number of shares sold at each separate price for each transaction.

### SIGNATURE

After reasonable inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true, complete and correct.

**Reporting Person:** Jacob DeWitte

**Signature:** /s/ R. Craig Bealmear

**Name/Title:** R. Craig Bealmear, Attorney-in-Fact

**Date:** 04/21/2026

After reasonable inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true, complete and correct.

**Reporting Person:** Caroline Cochran

**Signature:** /s/ R. Craig Bealmear

**Name/Title:** R. Craig Bealmear, Attorney-in-Fact

**Date:** 04/21/2026