J MATTHEW SINGLETON
CIK 1243514 · last filed 2026-01-05
"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
$401.5K
Companies
3
Total Filings
39
Lifetime Open-Market Net
-$6.82M
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 |
|---|---|---|---|---|---|---|---|
| VKTX | Director | 12,650 | $31.74 | $401.5K | -$4.58M | 12 | 2026-01-05 |
| Viking Therapeutics, Inc. (VKTXW) Delisted | Director | 9,500 | $4.60 | $43.7K | $93.3K | 6 | 2021-01-06 |
| CUBIST PHARMACEUTICALS INC (CBST) Delisted | Director | 4,972 | — | — | -$2.34M | 16 | 2013-06-14 |
Recent Filings · Page 3 of 4
39 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 |
|---|---|---|---|---|---|
| 2017-01-05 | Viking Therapeutics, Inc. (VKTXW) Delisted | Grant (A) | — | $0 | EDGAR |
| 2016-01-06 | VKTX | Grant (A) | — | $0 | EDGAR |
| 2015-04-30 | VKTX | Grant (A) | — | $0 | EDGAR |
| 2013-06-14 | CUBIST PHARMACEUTICALS INC (CBST) Delisted | Grant (A) | — | $0 | EDGAR |
| 2013-06-11 | CUBIST PHARMACEUTICALS INC (CBST) Delisted | Exer (M) | +1,347 | $0 | EDGAR |
| 2013-05-22 | CUBIST PHARMACEUTICALS INC (CBST) Delisted | Mixed | — | -$1.03M | EDGAR |
| 2012-08-27 | CUBIST PHARMACEUTICALS INC (CBST) Delisted | Mixed | — | -$88.6K | EDGAR |
| 2012-06-11 | CUBIST PHARMACEUTICALS INC (CBST) Delisted | Grant (A) | — | $0 | EDGAR |
| 2012-03-12 | CUBIST PHARMACEUTICALS INC (CBST) Delisted | Mixed | — | -$430.6K | EDGAR |
| 2012-02-06 | CUBIST PHARMACEUTICALS INC (CBST) Delisted | Mixed | — | -$60.8K | EDGAR |
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.