Latest filing published 08 Dec 2025 for Blueport Acquisition Ltd.
Insider track record
Not enough buy signals with a settled T+90 horizon to measure a track record yet.
No signal scores available.
William S. Rosenstadt: trading record in brief
William S. Rosenstadt (senior executive) discloses dealings in 2 companies, chiefly Q BioMed Inc. and Blueport Acquisition Ltd. Over a trading history stretching from 18 July 2016 to 13 November 2025, the count stands at 41 filings.
Both buying and selling appear: 1 purchase, against 36 sales worth €478k. The amount is not disclosed for 1 filing. Open-market purchases are the filings investors watch most closely, because the insider pays for the shares out of pocket. The rest of the record consists of 3 share grants. Since January 2025: 1 purchase and no sales on the market.
The latest filing, published on 8 December 2025, reports an open-market purchase in Blueport Acquisition Ltd. Filings reach the SEC (Form 4) feed a median of 16 days after the trade. Section 16 rules allow two business days to file each Form 4. Selling is not necessarily a view on the stock: liquidity needs and diversification are common motives. Every figure here comes from the filings published by SEC (Form 4) and describes the past, not future prices; it is not investment advice.
Companies and markets linked to William S. Rosenstadt
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- 197,250 sharesClass A Ordinary Share, par value $0.0001 per shareSEC:0001185185-25-001967:0Canonical exit: 11 Feb 2026 (T+90)
- 250,000 shares@ US$25,000.00100.0% of flowCommon StockSEC:0001104659-22-066487:0
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