Skyline Builders Group Holding Limited: 5%+ holders

As of November 6, 2026, 2 holders' latest Schedule 13D or 13G filings report owning 5% or more of Skyline Builders Group Holding Limited. The largest reported stake is ASP Isotopes Inc.'s, at 36.7%. 3 filings are on record since September 22, 2025 (Schedule 13D, September 22, 2025).

ASP Isotopes Inc. also filed stake reports on 1 other company ↓

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Key facts

• Filing 2026-08-14 · Reporting person: Philadelphia Financial Management of San Francisco, LLC · Sole voting: 0 · Shared voting: 1,005,405 · Sole dispositive: 0 · Shared dispositive: 1,005,405 · SCHEDULE 13G/A, 2026-08-14
• Filed 2026-02-17 · Holder: Philadelphia Financial Management of San Francisco, LLC · Percent: 5.59% · SCHEDULE 13G
• Filed 2025-09-22 · Holder: ASP Isotopes Inc. · Percent: 36.7% · SCHEDULE 13D

Skyline Builders Group Holding Limited has 3 Schedule 13D or 13G filings on record since 2025-09-22. 2 holders' latest filing reports 5% or more of class a ordinary shares, $0.00001 par value per share. Each figure below is the holder's own, as filed, with the filing linked.

Holders

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More on Skyline Builders Group Holding Limited and the records around it.

Skyline Builders Group Holding Limited elsewhere on the record

• Who owns it

Companies that share a holder

• ASP Isotopes Inc. also filed stake reports on 1 other company: ENDRA Life Sciences Inc. (Oct 2026)
• Philadelphia Financial Management of San Francisco, LLC also filed stake reports on 3 other companies: U.S. Gold Corp. (Aug 2026), OneWater Marine Inc. (Oct 2025), Home Street Inc. (Aug 2025)

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Voting and dispositive power, as filed

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The latest filing identifies Skyline Builders Group Holding Limited by CUSIP G8193D104 and gives its principal executive office as Office A, 15/F, Tower A, Capital Tower, No.38 Wai Yip Street, Kowloon Bay (SCHEDULE 13G/A, 2026-08-14).

Purpose of Transaction (Item 4)

ASP Isotopes Inc.

On August 29, 2025, Quantum Leap Energy LLC ("QLE"), a wholly owned subsidiary of ASP Isotopes Inc., became a controlling shareholder of Skyline Builders Group Holding Limited, a company incorporated under the laws of the Cayman Islands ("SKBL" or the "Issuer") with its Class A Ordinary Shares listed on The Nasdaq Stock Market LLC under the symbol "SKBL". QLE intends to use SKBL to pursue opportunities to acquire assets in the critical materials supply chain that QLE believes will help the United States and QLE secure important feedstocks that are vital to the security of the United States and long-term growth of QLE. SKBL Share Capital Structure. SKBL has a dual class ordinary share structure. SKBL's Ordinary Shares are divided into Class A Ordinary Shares ("Class A Ordinary Shares") and Class B Ordinary Shares ("Class B Ordinary Shares"). Each Class A Ordinary Share entitles the holder thereof to one (1) vote on all matters subject to vote at general meetings of SKBL, and each Class B Ordinary Share entitles the holder thereof to twenty (20) votes on all matters subject to vote at general meetings of SKBL. In no event shall Class A Ordinary Shares be convertible into Class B Ordinary Shares. In no event shall Class B Ordinary Shares be convertible into Class A Ordinary Shares. QLE's Purchase of Controlling Interest in SKBL. On August 27, 2025, Supreme Development (BVI) Holdings Limited ("SD"), SKBL's previous controlling shareholder and a company beneficially …The first part of Item 4 of the SCHEDULE 13D filed 2025-09-22; the filing has the rest

Timeline

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Questions about who owns Skyline Builders Group Holding Limited

Who owns Skyline Builders Group Holding Limited?

On this page, 2 holders' latest ownership filings report 5% or more of Skyline Builders Group Holding Limited: ASP Isotopes Inc. (36.7%, Schedule 13D, filed 2025-09-22) and Philadelphia Financial Management of San Francisco, LLC (8.16%, Schedule 13G/A, filed 2026-08-14).

Who are the largest shareholders of Skyline Builders Group Holding Limited?

By the share each holder's latest filing reports, the largest holders of Skyline Builders Group Holding Limited on this page are ASP Isotopes Inc. (36.7%) and Philadelphia Financial Management of San Francisco, LLC (8.16%).

When did ASP Isotopes Inc. buy into Skyline Builders Group Holding Limited?

The filings give report dates, not purchase dates. The earliest filing from ASP Isotopes Inc. on this page is the Schedule 13D, filed 2025-09-22, reporting 36.7%.

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%); 3 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.

Also on the record for Skyline Builders Group Holding Limited

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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.

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