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Form SCHEDULE 13D/A Penguin Solutions, Inc. Filed by: SK TELECOM CO LTD

July 28, 2026 7:51 AM





If the filing person has previously filed a statement on Schedule 13G to report the acquisition that is the subject of this Schedule 13D, and is filing this schedule because of §§ 240.13d-1(e), 240.13d-1(f) or 240.13d-1(g), check the following box.

The information required on the remainder of this cover page shall not be deemed to be “filed” for the purpose of Section 18 of the Securities Exchange Act of 1934 (“Act”) or otherwise subject to the liabilities of that section of the Act but shall be subject to all other provisions of the Act (however, see the Notes).




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SCHEDULE 13D




Comment for Type of Reporting Person:
The Convertible Preferred Shares of the Issuer (the Preferred Shares) are directly held by Astra AI Infra LLC, a special purpose vehicle established by SK Telecom Co., Ltd. to invest in the Issuer. SK Telecom Co., Ltd. may be deemed to have sole voting and dispositive power with respect to the Preferred Shares held by Astra AI Infra LLC. The number of Ordinary Shares into which the Preferred Shares may convert is calculated as of July 27, 2026, and is subject to adjustment, as described in the Certificate of Designation of the Preferred Shares, as amended or modified from time to time (the Certificate). The Preferred Shares are convertible into a number of the Issuer's Ordinary Shares to be determined at the time of conversion based on the Accumulated Stated Value (as defined in the Certificate) of the Preferred Shares, accumulated Compounded Dividends (as defined in the Certificate) and the Conversion Price (as defined in the Certificate). As of the date of issuance, the Accumulated Stated Value of the Preferred Shares was $200 million and the Conversion Price was $32.80784. The Accumulated Stated Value and the Conversion Price are subject to adjustment as described in Section 4 of the Certificate. The information set forth in Rows (7), (9), (11) and (13) is subject to the Investor Agreement described in Item 6 of this Schedule 13D.


SCHEDULE 13D




Comment for Type of Reporting Person:
The number of Ordinary Shares into which the Preferred Shares may convert is calculated as of July 27, 2026, and is subject to adjustment, as described in the Certificate. The Preferred Shares are convertible into a number of the Issuer's Ordinary Shares to be determined at the time of conversion based on the Accumulated Stated Value (as defined in the Certificate) of the Preferred Shares, accumulated Compounded Dividends (as defined in the Certificate) and the Conversion Price (as defined in the Certificate). As of the date of issuance, the Accumulated Stated Value of the Preferred Shares was $200 million and the Conversion Price was $32.80784. The Accumulated Stated Value and the Conversion Price are subject to adjustment as described in Section 4 of the Certificate. The information set forth in Rows (7), (9), (11) and (13) is subject to the Investor Agreement described in Item 6 of this Schedule 13D.


SCHEDULE 13D


SK Telecom Co., Ltd.
Signature:/s/ Jong Suk Park
Name/Title:Jong Suk Park/CFO
Date:07/27/2026
Astra AI Infra LLC
Signature:/s/ Jae Shin Lee
Name/Title:Jae Shin Lee/CEO
Date:07/27/2026

ATTACHMENTS / EXHIBITS

EX-99.B

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SEC Filings