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David Allen Tanner

CIK 1318960 · last filed 2026-08-31

David Allen Tanner is a corporate insider who has filed 16 SEC Form 4 insider transactions across 3 companies since 2007. The most recent filing, for WTM, was dated Aug 31, 2026. Across all open-market trades the lifetime net is +$676.0K, making them a net buyer over the disclosed history. Current disclosed insider exposure totals $5.6M across reported positions. 14 SEC filings were submitted jointly with WHITE MOUNTAINS INSURANCE GROUP LTD.

"Disclosed insider exposure" sums this person's most-recently-reported share counts across each company they're an insider in, multiplied by the current underlying price. It is not net worth — it misses retail holdings, private investments, real estate, index funds, and any company where the person isn't an SEC-reporting insider. For informational purposes only.

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Disclosed Exposure

$5.56M

Companies

3

Total Filings

16

Lifetime Open-Market Net

$676.0K

Filer Profile

Reported Address
C/O ARLON GROUP LLC
277 PARK AVE
NEW YORK, NY 10172
Related Filers
WHITE MOUNTAINS INSURANCE GROUP LTD — 14 joint filings, latest 2026-08-31
Profile details as reported on the filer's SEC submissions — for individual insiders the address is often in care of the issuer. Related filers are identified from jointly filed SEC submissions and shared reported addresses. View filings on SEC EDGAR.

Holdings By Company

Latest on-record share count from this person's most recent non-derivative Form 4 transaction in each company. Disclosed exposure = shares × current underlying price.
Symbol Role Shares Price Disclosed Exposure Lifetime OM Net Filings Latest Filed
WTM Director 2,012 $2103.49 $4.23M $459.2K 13 2026-08-31
NBN Director 10,000 $132.86 $1.33M $216.8K 2 2019-05-16
PROTECTION ONE INC (PONE) Delisted Director 8,114 — — $0 1 2007-09-24

Recent Filings

16 filings
Insider activity across all companies, newest first. Form 4 rows are post-trade confirmations (buys, sells, grants, exercises). Notice (144) rows are pre-trade notices of intent to sell restricted or control stock under Rule 144 — they may not all execute. Compare adjacent dates to see which notices became actual sales.
Filed Symbol Action Net Shares Net $ Link
2026-08-31 WTM Gift (G) −2 $0 EDGAR
2026-05-22 WTM Grant (A) +135 $0 EDGAR
2026-03-05 WTM Gift (G) −225 $0 EDGAR
2025-11-10 WTM Gift (G) −4 $0 EDGAR
2025-05-23 WTM Grant (A) +150 $0 EDGAR
2024-05-24 WTM Grant (A) +165 $0 EDGAR
2023-05-26 WTM Grant (A) +180 $0 EDGAR
2022-05-27 WTM Grant (A) +225 $0 EDGAR
2021-05-28 WTM Grant (A) +225 $0 EDGAR
2020-05-22 WTM Grant (A) +225 $0 EDGAR
Showing 1–10 of 16
Page 1 of 2
Form 4 codes: P = open-market purchase · S = open-market sale · A = grant/award · M = option exercise · F = tax withholding at vest · G = bona-fide gift · D = disposition to issuer · J = other (see filing footnote). Only P / S codes carry directional signal.
Notice (144 / 144/A): Form 144 is a notice of intent to sell restricted/control stock under Rule 144, filed before the sale; 144/A is an amendment. Many notices are pre-scheduled under Rule 10b5-1 plans. A Form 4 with code S typically follows within a few days when the planned sale executes; missing follow-up Form 4s suggest the notice was cancelled or modified.