Insiders who reported open-market trades in the last 12 months at the companies John Joseph Johnston files at. Multiple unrelated insiders buying the same stock within a short window, cluster buying, has historically been one of the strongest Form 4 signals.
Douglas J. Swirsky - $8K in MXCT purchases and sales in the last 12 months
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John Joseph Johnston is a corporate insider of MAXCYTE, INC. (MXCT). InsiderAlpha holds 5 primary Form 4 filings for them, the earliest from 2024, updated as new SEC EDGAR filings are processed.
When did John Joseph Johnston last file a Form 4?
The most recent primary Form 4 on record is dated 22 June 2026, one of 5 filings going back to 2024.
Has John Joseph Johnston been buying or selling stock?
Recorded transactions: 0 open-market purchases and 4 open-market sales ($35K) across all tracked filings.
John Joseph Johnston files SEC Form 4 reports at MAXCYTE, INC. (MXCT). 5 SEC Form 4 filings on record going back to 2024, most recently on 22 June 2026. Most recent open-market trade: sold $12K of MXCT on 30 December 2024. Lifetime open-market sales: $35K.
Recent transactions
12
The latest 12 SEC Form 4 transactions reported by John Joseph Johnston.
InsiderAlpha's records for John Joseph Johnston go back to 2024: 5 primary Form 4 filings, an average of 1.7 per year. 16 recorded transactions carry a Rule 10b5-1 plan flag. This identifies the marked transactions as reported under a trading plan; it does not establish the plan status of unmarked transactions.
