American Chemical Society takes 15.5% stake in Research Signals; Crimson Interactive takes 2.6%

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American Chemical Society has entered Research Signals Limited’s register, an online research-integrity platform, with that stake in ordinary shares.

Crimson Interactive Inc has also entered the register, holding the smaller stake in ordinary shares.

The wider filing records a rise in total shares and a smaller increase by Fullstopp GmbH. Filed on 23 September 2026, the changes cover 11 September 2025 to 11 September 2026.

Shareholder data

Source: Companies House confirmation statement (CS01) — period to , filed .

Changes in this confirmation statement

TypeShareholderSharesChangeShare classes
New shareholderCRIMSON INTERACTIVE INC40,888
ORDINARY 40,888
IncreasedFULLSTOPP GMBH16,133+61%
ORDINARY 16,133

Current shareholders (2)

ShareholderTotal sharesShare classes
CRIMSON INTERACTIVE INC40,888
ORDINARY 40,888
FULLSTOPP GMBH16,133
ORDINARY 16,133

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