Both our policy and product cover this use case. Even if we encourage companies to have public visibility on SeedBlink Secondary Market for their benefit, we understand the concerns that may arise.
For a company with public visibility on the bulletin board and explicitly expressing its concerns regarding new investors for a specific Secondary Market event, we can generate the list of new shareholders at the end of each quarter (only if an SPV restructuring takes place).
Also, companies can opt-in to have limited visibility on the bulletin board, which means that only shareholders in the present SPV(s) can see the offers and conclude transactions. Even when open to a broader community of verified investors, the asking price for the shares is not displayed anywhere but agreed upon by the parties engaging in the exchange privately.