Reid Tarlton Campbell is Director at WHITE MOUNTAINS INSURANCE GROUP LTD (WTM). They have made 8 open-market trades across 1 company since 2009, most recently 2026-05-21.
CIK 0001378156
Unrated. We grade insiders only on stock they chose to buy on the open market. Grants, option exercises and vesting say nothing about timing, so they don't count — which is why someone can file often and still have no grade. It isn't a bad sign: unrated buys beat every graded tier below A.
0 open-market purchases, against 8 sales. Too few scored purchases to measure a record yet.
| Ticker | Shares | Value |
|---|---|---|
| WTM | 10,575 | $22.8M |
Shares reported on the most recent Form 4, priced at the 2026-05-22 close.
Counted per filing, not per execution lot — a purchase filled in several tranches is one decision.
| Ticker | Type | Traded | Filed | Price | Value | 7d Stock | 30d Stock | 90d Stock |
|---|---|---|---|---|---|---|---|---|
| WTM | SELL | 2025-12-19 | 2025-12-22 | $2050.00 | $10.3M | -1.0% | -0.4% | +4.2% |
| WTM | SELL | 2013-11-21 | 2013-11-25 | $603.47 | $845K | -0.6% | -1.1% | -1.1% |
| WTM | SELL | 2013-05-15 | 2013-05-17 | $606.43 | $1.9M | -0.6% | -1.1% | -1.1% |
| WTM | SELL | 2012-12-07 | 2012-12-10 | $519.01 | $467K | -0.6% | -1.1% | -1.1% |
| WTM | SELL | 2011-12-27 | 2011-12-28 | $450.90 | $643K | -0.6% | -1.1% | -1.1% |
| WTM | SELL | 2011-12-02 | 2011-12-05 | $425.60 | $213K | -0.6% | -1.1% | -1.1% |
| WTM | SELL | 2011-06-07 | 2011-06-09 | $402.16 | $201K | -0.6% | -1.1% | -1.1% |
| WTM | SELL | 2009-12-23 | 2009-12-28 | $334.08 | $33K | -0.6% | -1.1% | -1.1% |
Grouped by shared companies and similar filing behaviour. This is a similarity measure, not a ranking or a performance signal.