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Stocks/RMIX/SEC Filings/SCHEDULE 13D/A Oct 13, 2026

RMIX SCHEDULE 13D/A: Board change

Filed with the SEC on Oct 13, 2026 · accession 0001104659-26-115657

RMIX filed a SCHEDULE 13D/A (schedule 13d/a) with the SEC on Oct 13, 2026. A member of Haymaker Sponsor IV LLC executed a Joinder Agreement to the Sponsor Support Agreement, agreeing to hold distributed shares of Suncrete, Inc. Class A Common Stock and private placement warrants subject to transfer restrictions. The stock moved +0.3% by the first close after the filing.

Summary of the filing

A member of Haymaker Sponsor IV LLC executed a Joinder Agreement to the Sponsor Support Agreement, agreeing to hold distributed shares of Suncrete, Inc. Class A Common Stock and private placement warrants subject to transfer restrictions. This relates to the sponsor's distribution of 3,564,267 shares and 75,000 warrants to its members following the closing of the business combination.

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Key details

Shares of Class A Common Stock held by Sponsor and being distributed$3.6M
Private placement warrants to purchase Class A Common Stock held by Sponsor and being distributed$75K
Sponsor distributing securities to membersHaymaker Sponsor IV LLC
Issuer of the securities being distributedSuncrete, Inc.
Former spac entity in the business combinationHaymaker Acquisition Corp. 4
Party to the business combination agreementConcrete Partners Holding, LLC

How RMIX stock reacted

Close before

$10.94

Oct 12, 2026

First close after

+0.27%

$10.97

5 trading days

-10.42%

$9.80

Since filing

-19.65%

$8.79

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Frequently asked questions

What did RMIX file with the SEC on Oct 13, 2026?

RMIX filed a SCHEDULE 13D/A (Board change). A member of Haymaker Sponsor IV LLC executed a Joinder Agreement to the Sponsor Support Agreement, agreeing to hold distributed shares of Suncrete, Inc. Class A Common Stock and private placement warrants subject to transfer restrictions. This relates to the sponsor's distribution of 3,564,267 shares and 75,000 warrants to its members following the closing of the business combination.

What does a board change mean for RMIX stock?

Not always. A planned retirement with a successor is usually calm; a sudden departure “effective immediately”, especially of a CFO or near results, often worries investors.

How do I read a SCHEDULE 13D/A?

A report the company filed with the SEC (the US market regulator). Start with the summary, then the key amounts and names. Compare it with the company’s earlier filings.

Why are SEC filings important?

Public companies must tell the SEC about anything that can change their value — results, leadership changes, big deals, new shares, bankruptcy. Filings are the official source, often before the news. A SCHEDULE 13D/A (schedule 13d/a): A report the company filed with the SEC (the US market regulator).

How did RMIX stock react to this filing?

RMIX closed at $10.94 before the filing and $10.97 on Oct 13, 2026 (+0.27%). Five trading days later: $9.80 (-10.42%).

Other RMIX SEC filings

  • 424B3 · Shelf registrationNov 2, 2026
  • SCHEDULE 13D/A · SEC filingOct 22, 2026
  • SCHEDULE 13G/A · SEC filingOct 9, 2026
  • SCHEDULE 13G/A · SEC filingAug 14, 2026
  • SCHEDULE 13G · SEC filingAug 14, 2026

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Source: SEC EDGAR filing 0001104659-26-115657. The summary and key details are extracted by SEPT from the filing and may contain errors. Price reaction uses daily closing prices. Not financial advice.