Mark Campbell Winmill

Mark Campbell Winmill is a declared insider of Global Self Storage, Inc., with filings sourced from SEC (Form 4). Over a trading history stretching from 20 August 2021 to 10 September 2026, the count stands at 21 filings.

On the market, this insider has only ever bought: 16 purchases, €168k in total. Unlike grants, an open-market purchase is paid for by the insider, at the market price. Outside the open market, there are 5 share grants. In 2026 alone, the filings show 5 purchases and no sales.

In size, the median ticket on the buying side is €7,067. As a share of market capitalisation, the median purchase stands at 0.014%, based on 5 purchases. Clusters matter here: 11 out of 16 purchases overlapped with buying by a colleague within 30 days. When several insiders buy within a few weeks of each other, analysts speak of a cluster purchase.

The latest filing, published on 11 September 2026, reports an open-market purchase of €222 in Global Self Storage, Inc. Filings reach the SEC (Form 4) feed a median of 1 day after the trade. US insiders must file a Form 4 within two business days of a trade. Source: insider filings from SEC (Form 4). Past trades are no guide to future returns.