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Insider Trading Intelligence
RC

Reid Tarlton Campbell

WTM
EVP & CHIEF FINANCIAL OFFICER · WHITE MOUNTAINS INSURANCE GROUP LTD · CIK 0001378156
FILING MIX · LIFETIME35%/65%
BUYS
6
SELLS
11
TOTAL VALUE
$15.23M
COMPANIES
1
ACTIVE SINCE
Jan 2020
HOLDINGS NOW
10,575
AVG SELL PX
$1,656.35
TRADE KIND
SHOWING 17 / 17
Trades · vs SPY
Loading price series…
Performance · forward returns vs SPY
1 backtested trades · 8 horizons · 2 pendingHow are these numbers computed? →
Forward-return performance of every backtestable P/S trade by Reid Tarlton Campbell, measured at 8 horizons from 7 days to 2 years. Deduped per economic event so co-filings count once. Excess return = trade return minus SPY return over the same window.
HORIZONTRADESWIN RATEINSIDER RETURNSPY RETURNMEAN EXCESSMEDIAN EXCESST-STAT
7d1+0.00%+0.99%+1.43%-0.43%-0.43%
14d1+100.00%-0.01%+0.38%-0.39%-0.39%
30d1+0.00%+0.70%+1.63%-0.92%-0.92%
60d1+0.00%+9.25%+0.33%+8.91%+8.91%
90d1+0.00%+6.81%-3.06%+9.87%+9.87%
180d1+100.00%-0.47%+10.25%-10.72%-10.72%
1y1(1 pending)
2y1(1 pending)
How to read this: Insider Returnis the average raw return of the filer's trades over the horizon. SPY Return is what SPY did over those same windows — reference only, not a comparison. The headline alpha number is Mean Excess = Insider − SPY; green means the filer beat SPY, red means they trailed it. Win rate is the share of individual trades where the filer beat SPY. T-statvalues above 2 mean the alpha is unlikely to be chance given the sample size. "Pending" counts trades where the horizon hasn't elapsed yet; their stats are not included in the row average.
Holdings over time
WTM · 10,575 shares · as of May 21, 2026
03,8737,74511,61815,4902020202120222023202420252026SHARES HELD
Trading cadence · quarterly flow
BUY SELL
2020
2020
2020
2020
2021
2021
2021
2021
2022
2022
2022
2022
2023
2023
2023
2023
2024
2024
2024
2024
2025
2025
2025
2025
2026
2026
FLOW · 6 buys / 11 sellsCOVERAGE · 26 quarters
Form 4 filings · all activity
COMPANYTYPESHARESPRICEVALUEHELD AFTERTRADE DATEFILEDDETAILS
WTM
WHITE MOUNTAINS INSURANCE GROUP LTD
PURCHASEGRANT
Stock grant
13510,575May 21, 2026May 21, 2026View →
WTM
WHITE MOUNTAINS INSURANCE GROUP LTD
SALE
5,00010,440Dec 19, 2025Dec 22, 2025View →
WTM
WHITE MOUNTAINS INSURANCE GROUP LTD
SALE
5,000$2,050.00$10.25M10,440Dec 19, 2025Dec 22, 2025View →
WTM
WHITE MOUNTAINS INSURANCE GROUP LTD
SALEGRANT
Gift
5015,440Nov 25, 2025Nov 26, 2025View →
WTM
WHITE MOUNTAINS INSURANCE GROUP LTD
PURCHASEGRANT
Stock grant
15015,490May 22, 2025May 22, 2025View →
WTM
WHITE MOUNTAINS INSURANCE GROUP LTD
PURCHASEGRANT
Stock grant
16515,340May 23, 2024May 24, 2024View →
WTM
WHITE MOUNTAINS INSURANCE GROUP LTD
SALEGRANT
Gift
5515,175Mar 21, 2024Mar 21, 2024View →
WTM
WHITE MOUNTAINS INSURANCE GROUP LTD
PURCHASEGRANT
Stock grant
4515,230Feb 22, 2024Feb 23, 2024View →
WTM
WHITE MOUNTAINS INSURANCE GROUP LTD
SALE
President
710$1,505.01$1.07M15,185Jan 1, 2024Jan 2, 2024View →
WTM
WHITE MOUNTAINS INSURANCE GROUP LTD
SALE
President
710$1,414.33$1.00M14,095Jan 1, 2023Jan 3, 2023View →
WTM
WHITE MOUNTAINS INSURANCE GROUP LTD
SALEGRANT
Gift
10013,005Jun 1, 2022Jun 2, 2022View →
WTM
WHITE MOUNTAINS INSURANCE GROUP LTD
SALE
EVP & Chief Financial Officer
800$1,013.90$811.1K13,105Jan 1, 2022Jan 4, 2022View →
WTM
WHITE MOUNTAINS INSURANCE GROUP LTD
PURCHASEGRANT
Stock grant
1,8005,600Feb 25, 2021Feb 26, 2021View →
WTM
WHITE MOUNTAINS INSURANCE GROUP LTD
SALE
EVP & Chief Financial Officer
930$1,000.66$930.6K11,905Jan 1, 2021Jan 4, 2021View →
WTM
WHITE MOUNTAINS INSURANCE GROUP LTD
SALEGRANT
Gift
3010,835Dec 8, 2020Dec 10, 2020View →
WTM
WHITE MOUNTAINS INSURANCE GROUP LTD
PURCHASEGRANT
Stock grant
1,8005,800Feb 27, 2020Mar 2, 2020View →
WTM
WHITE MOUNTAINS INSURANCE GROUP LTD
SALE
EVP & Chief Financial Officer
1,045$1,115.51$1.17M10,865Jan 1, 2020Jan 2, 2020View →
Other insiders · WTM
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About this filer
CIK 0001378156
ROLE
EVP & Chief Financial Officer
PRIMARY
WTM
COMPANIES
1
ACTIVE SINCE
Jan 2020
MARKETPEEL · /INSIDER/0001378156DATA · SEC EDGAR · FORM 4 · CONSOLIDATED TAPE
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