Lyell Immunopharma, Inc. Schedule 13G/A shows Explore Investments LLC and Jeffrey P. Bezos each report beneficial ownership of 1,529,054 shares of Lyell common stock, representing 6.6% of the outstanding shares. The percentage is calculated using 23,328,390 shares outstanding as of March 31, 2026, per the issuer's preliminary prospectus dated April 3, 2026. The filing states Explore is the direct holder and that Mr. Bezos may be deemed the beneficial owner as sole member of Explore. Signatures appear dated May 8, 2026.
The Schedule 13G/A lists 1,529,054 shares (6.6%) held by Explore Investments LLC and attributed to Jeffrey P. Bezos as sole member. The filing relies on the issuer's prospectus share count of 23,328,390 as of March 31, 2026.
Rule citations and the attribution to a holding LLC are central: this filing records beneficial ownership status and public disclosure obligations; subsequent filings or changes in holdings would adjust reporting obligations under the Exchange Act.
Filing structure follows Rule 13d-3 attribution and percent calculation conventions.
The amendment clarifies that Explore is the direct holder and Mr. Bezos may be deemed beneficial owner under Rule 13d-3; the percent (6.6%) is expressly tied to the prospectus outstanding share figure. The signature block confirms timely amendment filing.
Compliance focus: recordkeeping for future amendments and monitoring of any change above reporting thresholds remains necessary.
Key Figures
Beneficially owned shares:1,529,054 sharesPercent of class:6.6%Shares outstanding used:23,328,390 shares
3 metrics
Beneficially owned shares1,529,054 sharesreported as of March 31, 2026
Percent of class6.6%calculated using 23,328,390 shares outstanding as of March 31, 2026
Shares outstanding used23,328,390 sharesissuer's preliminary prospectus dated April 3, 2026
Key Terms
Schedule 13G/A, Rule 13d-3, Beneficial ownership
3 terms
Schedule 13G/Aregulatory
"Amendment No. 1 and Item 1 naming the issuer"
A Schedule 13G/A is an amended public filing with the U.S. securities regulator that updates a previous Schedule 13G, disclosing when an individual or group holds a substantial (typically over 5%) stake in a company and is claiming a passive, non‑controlling intent. Investors monitor these updates because rising or falling holdings can signal changing confidence, potential future moves, or shifts in voting power — like watching a public ledger where large shareholders quietly adjust their positions.
Rule 13d-3regulatory
"references to calculation and beneficial ownership attribution"
Rule 13d-3 defines who is treated as the beneficial owner of a company’s shares for U.S. securities disclosure rules — essentially anyone who has the power to vote or direct how shares are voted, or the power to buy or sell them, even if they don’t hold the certificates. For investors this matters because crossing certain ownership thresholds triggers public filing and disclosure obligations and signals potential control or influence, much like having the keys to a car implies you can drive it even if it’s registered to someone else.
Beneficial ownershipregulatory
"Item 4 describes beneficial ownership under Rule 13d-3"
Beneficial ownership means the person or entity that actually enjoys the benefits of owning shares or other assets — such as receiving dividends, voting rights, or price gains — even if the legal title is held in another name. For investors it matters because knowing who truly controls and profits from a company reveals who can influence decisions, exposes potential conflicts of interest or hidden concentration of power, and affects transparency and risk in the stock.
SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549
SCHEDULE 13G
UNDER THE SECURITIES EXCHANGE ACT OF 1934
(Amendment No. 1)
Lyell Immunopharma, Inc.
(Name of Issuer)
Common Stock, par value $0.0001 per share
(Title of Class of Securities)
55083R203
(CUSIP Number)
03/31/2026
(Date of Event Which Requires Filing of this Statement)
Check the appropriate box to designate the rule pursuant to which this Schedule is filed:
Rule 13d-1(b)
Rule 13d-1(c)
Rule 13d-1(d)
schemaVersion:
SCHEDULE 13G
CUSIP Number(s):
55083R203
1
Names of Reporting Persons
Explore Investments LLC
2
Check the appropriate box if a member of a Group (see instructions)
(a)
(b)
3
Sec Use Only
4
Citizenship or Place of Organization
DELAWARE
Number of Shares Beneficially Owned by Each Reporting Person With:
5
Sole Voting Power
0.00
6
Shared Voting Power
1,529,054.00
7
Sole Dispositive Power
0.00
8
Shared Dispositive Power
1,529,054.00
9
Aggregate Amount Beneficially Owned by Each Reporting Person
1,529,054.00
10
Check box if the aggregate amount in row (9) excludes certain shares (See Instructions)
11
Percent of class represented by amount in row (9)
6.6 %
12
Type of Reporting Person (See Instructions)
OO
Comment for Type of Reporting Person: The percentage reported in Row 11 is calculated in accordance with Rule 13(d)-3(d)(1)(i) promulgated under the Securities Exchange Act of 1934 (as amended, the "Exchange Act") and based on an aggregate total of 23,328,390 shares of the common stock of Lyell Pharmaceuticals, Inc. (the "Issuer") outstanding as of March 31, 2026, as reported by the Issuer in its preliminary prospectus (the "Prospectus") (File No. 333-294884) dated April 3, 2026, incorporated in the Issuer's Form S-3 registration statement filed with the Securities and Exchange Commission (the "SEC") on April 3, 2026.
SCHEDULE 13G
CUSIP Number(s):
55083R203
1
Names of Reporting Persons
Jeffrey P. Bezos
2
Check the appropriate box if a member of a Group (see instructions)
(a)
(b)
3
Sec Use Only
4
Citizenship or Place of Organization
UNITED STATES
Number of Shares Beneficially Owned by Each Reporting Person With:
5
Sole Voting Power
0.00
6
Shared Voting Power
1,529,054.00
7
Sole Dispositive Power
0.00
8
Shared Dispositive Power
1,529,054.00
9
Aggregate Amount Beneficially Owned by Each Reporting Person
1,529,054.00
10
Check box if the aggregate amount in row (9) excludes certain shares (See Instructions)
11
Percent of class represented by amount in row (9)
6.6 %
12
Type of Reporting Person (See Instructions)
IN
Comment for Type of Reporting Person: For purposes of Rule 13d-3 under the Exchange Act, all shares of the Issuer's common stock held by Explore may be deemed to be beneficially owned by Jeffrey P. Bezos as the sole member of Explore.
The percentage reported in Row 11 is calculated in accordance with Rule 13(d)-3(d)(1)(i) promulgated under the Exchange Act and based on an aggregate total of 23,328,390 shares of the Issuer's common stock outstanding as of March 31, 2026, as reported by the Issuer in the Prospectus.
SCHEDULE 13G
Item 1.
(a)
Name of issuer:
Lyell Immunopharma, Inc.
(b)
Address of issuer's principal executive offices:
201 Haskins Way, South San Francisco, CA, 94080.
Item 2.
(a)
Name of person filing:
Explore Investments LLC, a Delaware limited liability company ("Explore")
Jeffrey P. Bezos, an Individual ("Mr. Bezos" and together with Explore, the "Reporting Persons")
(b)
Address or principal business office or, if none, residence:
The address of the principal business office of each of the Reporting Persons is:
P.O. Box 6470
Surfside, FL 33154
(c)
Citizenship:
Explore is formed in the State of Delaware. Mr. Bezos is a citizen of the United States of America.
(d)
Title of class of securities:
Common Stock, par value $0.0001 per share
(e)
CUSIP No.:
55083R203
Item 3.
If this statement is filed pursuant to §§ 240.13d-1(b) or 240.13d-2(b) or (c), check whether the person filing is a:
(a)
Broker or dealer registered under section 15 of the Act (15 U.S.C. 78o);
(b)
Bank as defined in section 3(a)(6) of the Act (15 U.S.C. 78c);
(c)
Insurance company as defined in section 3(a)(19) of the Act (15 U.S.C. 78c);
(d)
Investment company registered under section 8 of the Investment Company Act of 1940 (15 U.S.C. 80a-8);
(e)
An investment adviser in accordance with § 240.13d-1(b)(1)(ii)(E);
(f)
An employee benefit plan or endowment fund in accordance with § 240.13d-1(b)(1)(ii)(F);
(g)
A parent holding company or control person in accordance with § 240.13d-1(b)(1)(ii)(G);
(h)
A savings associations as defined in Section 3(b) of the Federal Deposit Insurance Act (12 U.S.C. 1813);
(i)
A church plan that is excluded from the definition of an investment company under section 3(c)(14) of the Investment Company Act of 1940 (15 U.S.C. 80a-3);
(j)
A non-U.S. institution in accordance with § 240.13d-1(b)(1)(ii)(J). If filing as a non-U.S. institution in accordance with § 240.13d-1(b)(1)(ii)(J),
please specify the type of institution:
(k)
Group, in accordance with Rule 240.13d-1(b)(1)(ii)(K).
Item 4.
Ownership
(a)
Amount beneficially owned:
Reference to "beneficial ownership" of securities for purposes of this amendment 1 to the statement on Schedule 13G (this "Statement") shall be understood to refer to beneficial ownership as that term is defined in Rule 13d-3 of the Securities Exchange Act of 1934, as amended (the "Exchange Act").
As of March 31, 2026, the Reporting Persons may each be deemed to directly or indirectly beneficially own an aggregate 1,529,054 shares of the Issuer's common stock.
Explore is the direct holder of all the shares identified in the preceding paragraph. For purposes of Rule 13d-3 under the Exchange Act, all of the aforementioned securities of the Issuer directly held by Explore may be deemed to be beneficially owned by Mr. Bezos as the sole member of Explore. Notwithstanding, the filing of this Statement shall not be construed as an admission by Mr. Bezos, for purposes of Sections 13(d) or 13(g) of the Exchange Act or otherwise, as to beneficial ownership of the securities reported herein.
(b)
Percent of class:
As of March 31, 2026, the Reporting Persons were each deemed to directly or indirectly beneficially own an aggregate 6.6% of the Issuer's outstanding common stock.
The aforementioned percentage was calculated in accordance with Rule 13(d)-3(d)(1)(i) promulgated under the Exchange Act and based on an aggregate total of 23,328,390 shares of the Issuer's common stock outstanding as of March 31, 2026, as reported by the Issuer in its preliminary prospectus (the "Prospectus") (File No. 333-294884) dated April 3, 2026, incorporated in the Issuer's Form S-3 registration statement filed with the SEC on April 3, 2026.
(c)
Number of shares as to which the person has:
(i) Sole power to vote or to direct the vote:
Explore 0
Mr. Bezos 0
(ii) Shared power to vote or to direct the vote:
Explore 1,529,054
Mr. Bezos 1,529,054
(iii) Sole power to dispose or to direct the disposition of:
Explore 0
Mr. Bezos 0
(iv) Shared power to dispose or to direct the disposition of:
Explore 1,529,054
Mr. Bezos 1,529,054
Item 5.
Ownership of 5 Percent or Less of a Class.
Not Applicable
Item 6.
Ownership of more than 5 Percent on Behalf of Another Person.
Not Applicable
Item 7.
Identification and Classification of the Subsidiary Which Acquired the Security Being Reported on by the Parent Holding Company or Control Person.
Not Applicable
Item 8.
Identification and Classification of Members of the Group.
Not Applicable
Item 9.
Notice of Dissolution of Group.
Not Applicable
Item 10.
Certifications:
By signing below I certify that, to the best of my knowledge and belief, the securities referred to above were not acquired and are not held for the purpose of or with the effect of changing or influencing the control of the issuer of the securities and were not acquired and are not held in connection with or as a participant in any transaction having that purpose or effect, other than activities solely in connection with a nomination under ?? 240.14a-11.
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.
What stake does Explore Investments LLC report in Lyell Immunopharma (LYEL)?
Explore Investments LLC reports beneficial ownership of 1,529,054 shares of Lyell common stock. This position is shown as 6.6% of the company's outstanding shares, calculated using the issuer's reported figure of 23,328,390 shares as of March 31, 2026.
Why is Jeffrey P. Bezos named on the Schedule 13G/A for LYEL?
Jeffrey P. Bezos is named because he is the sole member of Explore Investments LLC; under Rule 13d-3 the shares held directly by Explore may be deemed beneficially owned by Mr. Bezos. The filing attributes shared voting and dispositive power accordingly.
What share count did the filing use to compute the 6.6% ownership?
The filing uses the issuer's preliminary prospectus figure of 23,328,390 shares outstanding as of March 31, 2026. The 6.6% percentage is calculated in accordance with Rule 13d-3(d)(1)(i) using that outstanding share total from the prospectus.
Who signed the Schedule 13G/A amendment for Explore and Jeffrey P. Bezos?
The amendment is signed by Paul Dauber as Manager for Explore Investments LLC and by Jeffrey P. Bezos as an individual. Both signature lines are dated May 8, 2026, confirming the amendment's execution on that date.
