How do you find disclosed multiple information for private middle-market deals?

Sources:

• Mergermarket / Dealreporter: news coverage, often with concrete multiple indications.
• Press releases from the buyers (especially listed ones): deal value and EBITDA assumptions are often disclosed on investor calls.
• Buyers' annual reports: goodwill notes can imply deal multiples.
• Industry newsletters (e.g. sector M&A trade press).
• Regulatory filings with the securities regulator in public-to-private deals.
• Direct research: for listed targets before a take-private, the share price the day before the deal announcement vs. the offer price. For pure private-to-private deals a concrete multiple is often unavailable — then use an 'estimated multiple' with a sanity-check range.