David T Howton

CIK 1529297 · Chief Operating Officer · last filed 2026-04-21

David T Howton is a Chief Operating Officer who has filed 40 SEC Form 4 insider transactions across 3 companies since 2011. The most recent filing, for SLDB, was dated Apr 21, 2026. Across all open-market trades the lifetime net is −$43.8M, making them a net seller over the disclosed history. Current disclosed insider exposure totals $11.5M across reported positions.

"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

$11.52M

Companies

3

Total Filings

40

Lifetime Open-Market Net

-$43.82M

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
SLDB Chief Operating Officer 105,077 $7.14 $750.2K -$498.9K 12 2026-04-21
SRPT EVP, General Counsel 130,984 $15.31 $2.01M -$43.31M 26 2020-06-22
VRTX SVP & Chief Legal Officer 19,703 $444.93 $8.77M -$14.5K 2 2012-02-06

Recent Filings

40 filings
Form 4 transactions across all companies, newest first.
Filed Symbol Action Net Shares Net $ Link
2026-04-21 SLDB Grant (A) $0 EDGAR
2026-02-18 SLDB Mixed +7,218 -$43.5K EDGAR
2026-02-06 SLDB Sell (S) −18,894 -$121.7K EDGAR
2026-02-02 SLDB Mixed +83,845 -$243.1K EDGAR
2025-12-04 SLDB Mixed +8,119 -$25.2K EDGAR
2025-08-18 SLDB Grant (A) $0 EDGAR
2025-02-18 SLDB Mixed +9,126 -$22.0K EDGAR
2025-02-11 SLDB Grant (A) $0 EDGAR
2024-12-04 SLDB Mixed +7,979 -$28.4K EDGAR
2024-02-16 SLDB Grant (A) $0 EDGAR
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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.