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The forfeited shares were the full 385,714 founder shares that were subject to forfeiture depending on the extent to which the underwriters' over-allotment option was exercised."},{"field":"shares","element":"transactionShares","label":"F1","text":"Represents the forfeiture for no consideration of 385,714 ordinary shares, par value $0.0001 per share, of Mountain Crest Acquisition 6 Corp. (the \"Issuer\") held by Mountain Crest Holdings 6 LLC because the underwriters of the Issuer's initial public offering did not exercise their over-allotment option. The forfeited shares were the full 385,714 founder shares that were subject to forfeiture depending on the extent to which the underwriters' over-allotment option was exercised."},{"field":"price","element":"transactionPricePerShare","label":"F1","text":"Represents the forfeiture for no consideration of 385,714 ordinary shares, par value $0.0001 per share, of Mountain Crest Acquisition 6 Corp. (the \"Issuer\") held by Mountain Crest Holdings 6 LLC because the underwriters of the Issuer's initial public offering did not exercise their over-allotment option. The forfeited shares were the full 385,714 founder shares that were subject to forfeiture depending on the extent to which the underwriters' over-allotment option was exercised."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F2","text":"Dr. Suying Liu controls Mountain Crest Holdings 6 LLC. As such, he may be deemed to have or share beneficial ownership of the securities held directly by Mountain Crest Holdings 6 LLC. Suying Liu disclaims any beneficial ownership of the reported shares other than to the extent of any pecuniary interest he may have therein, directly or indirectly."}],"balance_after":2596429,"source":{"system":"sec-edgar","filing":"0001829126-26-006888","document":"ownership.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1811534/000182912626006888/ownership.xml","form_type":"4"}},{"id":726121,"issuer":{"id":6854,"kind":"organization","name":"Mountain Crest Acquisition 6 Corp."},"owners":[{"id":35310,"kind":"organization","name":"Mountain Crest Holdings 6 LLC","position":1,"cik":"0002116124","reported_name":"Mountain Crest Holdings 6 LLC","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Ordinary shares","published_at":"2026-06-26T01:20:29.000Z","date":"2026-06-24","kind":"other","planned":false,"acquired":false,"shares":385714,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"Represents the forfeiture for no consideration of 385,714 ordinary shares, par value $0.0001 per share, of Mountain Crest Acquisition 6 Corp. (the \"Issuer\") held by Mountain Crest Holdings 6 LLC because the underwriters of the Issuer's initial public offering did not exercise their over-allotment option. The forfeited shares were the full 385,714 founder shares that were subject to forfeiture depending on the extent to which the underwriters' over-allotment option was exercised."},{"field":"shares","element":"transactionShares","label":"F1","text":"Represents the forfeiture for no consideration of 385,714 ordinary shares, par value $0.0001 per share, of Mountain Crest Acquisition 6 Corp. (the \"Issuer\") held by Mountain Crest Holdings 6 LLC because the underwriters of the Issuer's initial public offering did not exercise their over-allotment option. The forfeited shares were the full 385,714 founder shares that were subject to forfeiture depending on the extent to which the underwriters' over-allotment option was exercised."},{"field":"price","element":"transactionPricePerShare","label":"F1","text":"Represents the forfeiture for no consideration of 385,714 ordinary shares, par value $0.0001 per share, of Mountain Crest Acquisition 6 Corp. (the \"Issuer\") held by Mountain Crest Holdings 6 LLC because the underwriters of the Issuer's initial public offering did not exercise their over-allotment option. The forfeited shares were the full 385,714 founder shares that were subject to forfeiture depending on the extent to which the underwriters' over-allotment option was exercised."}],"balance_after":2596429,"source":{"system":"sec-edgar","filing":"0001829126-26-006887","document":"ownership.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/2109876/000182912626006887/ownership.xml","form_type":"4"}},{"id":791813,"issuer":{"id":6854,"kind":"organization","name":"Mountain Crest Acquisition 6 Corp."},"owners":[{"id":35399,"kind":"person","name":"Liu Suying","position":1,"cik":"0001811534","reported_name":"Liu Suying","relationship":{"director":true,"officer":true,"ten_percent_owner":true,"other":false,"officer_title":"CEO and CFO"}}],"security":"Rights","published_at":"2026-05-05T21:30:24.000Z","date":"2026-05-01","kind":"purchase","planned":false,"acquired":true,"shares":25000,"ownership":{"direct":false,"nature":"See Footnote"},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F1","text":"The reporting person acquired units, consisting of shares and rights."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F2","text":"The rights automatically convert into one-fourth (1/4) of one ordinary share upon the consummation of the registrant's initial business combination, as described in the registrant's prospectus initially filed with the Securities Exchange Commission on April 6, 2026."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F2","text":"The rights automatically convert into one-fourth (1/4) of one ordinary share upon the consummation of the registrant's initial business combination, as described in the registrant's prospectus initially filed with the Securities Exchange Commission on April 6, 2026."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F3","text":"Dr. Suying Liu controls Mountain Crest Holdings 6 LLC. As such, he may be deemed to have or share beneficial ownership of the securities held directly by Mountain Crest Holdings 6 LLC. Suying Liu disclaims any beneficial ownership of the reported shares other than to the extent of any pecuniary interest he may have therein, directly or indirectly"}],"balance_after":25000,"derivative":{"exercise_price":0,"underlying":"Ordinary Shares","underlying_shares":6250},"source":{"system":"sec-edgar","filing":"0001829126-26-004580","document":"ownership.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1811534/000182912626004580/ownership.xml","form_type":"4"}},{"id":791812,"issuer":{"id":6854,"kind":"organization","name":"Mountain Crest Acquisition 6 Corp."},"owners":[{"id":35399,"kind":"person","name":"Liu Suying","position":1,"cik":"0001811534","reported_name":"Liu Suying","relationship":{"director":true,"officer":true,"ten_percent_owner":true,"other":false,"officer_title":"CEO and CFO"}}],"security":"Ordinary shares","published_at":"2026-05-05T21:30:24.000Z","date":"2026-05-01","kind":"purchase","planned":false,"acquired":true,"shares":25000,"price":10,"value":250000.0,"ownership":{"direct":false,"nature":"See Footnote"},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"The reporting person acquired units, consisting of shares and rights."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F3","text":"Dr. Suying Liu controls Mountain Crest Holdings 6 LLC. As such, he may be deemed to have or share beneficial ownership of the securities held directly by Mountain Crest Holdings 6 LLC. Suying Liu disclaims any beneficial ownership of the reported shares other than to the extent of any pecuniary interest he may have therein, directly or indirectly"}],"balance_after":2982143,"source":{"system":"sec-edgar","filing":"0001829126-26-004580","document":"ownership.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1811534/000182912626004580/ownership.xml","form_type":"4"}},{"id":790964,"issuer":{"id":6854,"kind":"organization","name":"Mountain Crest Acquisition 6 Corp."},"owners":[{"id":35310,"kind":"organization","name":"Mountain Crest Holdings 6 LLC","position":1,"cik":"0002116124","reported_name":"Mountain Crest Holdings 6 LLC","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Rights","published_at":"2026-05-05T21:29:59.000Z","date":"2026-05-01","kind":"purchase","planned":false,"acquired":true,"shares":25000,"ownership":{"direct":true},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F1","text":"The reporting person acquired units, consisting of shares and rights."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F2","text":"The rights automatically convert into one-fourth (1/4) of one ordinary share upon the consummation of the registrant's initial business combination, as described in the registrant's prospectus initially filed with the Securities Exchange Commission on April 6, 2026."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F2","text":"The rights automatically convert into one-fourth (1/4) of one ordinary share upon the consummation of the registrant's initial business combination, as described in the registrant's prospectus initially filed with the Securities Exchange Commission on April 6, 2026."}],"balance_after":25000,"derivative":{"exercise_price":0,"underlying":"Ordinary Shares","underlying_shares":6250},"source":{"system":"sec-edgar","filing":"0001829126-26-004579","document":"ownership.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/2109876/000182912626004579/ownership.xml","form_type":"4"}},{"id":790963,"issuer":{"id":6854,"kind":"organization","name":"Mountain Crest Acquisition 6 Corp."},"owners":[{"id":35310,"kind":"organization","name":"Mountain Crest Holdings 6 LLC","position":1,"cik":"0002116124","reported_name":"Mountain Crest Holdings 6 LLC","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Ordinary shares","published_at":"2026-05-05T21:29:59.000Z","date":"2026-05-01","kind":"purchase","planned":false,"acquired":true,"shares":25000,"price":10,"value":250000.0,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"The reporting person acquired units, consisting of shares and rights."}],"balance_after":2982143,"source":{"system":"sec-edgar","filing":"0001829126-26-004579","document":"ownership.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/2109876/000182912626004579/ownership.xml","form_type":"4"}}]}