David T Howton
CIK 1529297 · Chief Operating Officer · last filed 2026-04-21
"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
$13.47M
Companies
3
Total Filings
45
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 | $8.56 | $899.5K | -$498.9K | 12 | 2026-04-21 |
| SRPT | EVP, General Counsel | 130,984 | $17.18 | $2.25M | -$43.31M | 26 | 2020-06-22 |
| VRTX | SVP & Chief Legal Officer | 19,703 | $523.91 | $10.32M | -$14.5K | 2 | 2012-02-06 |
Recent Filings · Page 5 of 5
45 filingsInsider 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 |
|---|---|---|---|---|---|
| 2014-03-04 | SRPT | Grant (A) | — | $0 | EDGAR |
| 2013-06-07 | SRPT | Grant (A) | — | $0 | EDGAR |
| 2012-11-07 | SRPT | Grant (A) | — | $0 | EDGAR |
| 2012-02-06 | VRTX | Grant (A) | +10,166 | $102 | EDGAR |
| 2011-09-07 | VRTX | Sell (S) | −328 | -$14.5K | EDGAR |
Showing 41–45 of 45
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Page 5 of 5
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.
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.