John Riolo
CIK 1408994 · View on SEC EDGAR ↗
Insider
First SEC filing: Aug. 6, 2007 · Latest: Aug. 6, 2007
On this page
Insider at
Insider transactions
0 buys (P)
0 sells (S)
Net:
$0
+ 2 non-open-market transactions below
last 12 months, based on the transactions shown below
Price change vs current quote, split-adjusted for corporate actions since the filing — not benchmarked, not annualized, not size-weighted
No open-market trades on record; showing all filings.
| Date | Ticker | Code | Shares | Price | Value | Owned after | Δ own | A/D | vs now |
|---|---|---|---|---|---|---|---|---|---|
| Aug. 2, 2007 | DXCM | A | 35,677 | — | — | 35,677 Direct | — | Acquired | (price as of 2026-08-18) |
| Aug. 2, 2007 | DXCM | A | 14,323 | — | — | 14,323 Direct | — | Acquired | (price as of 2026-08-18) |
P = Open-market purchase · S = Sale · A = Grant/award · M = Option exercise · G = Gift · F = Tax withholding
Insider transactions are not a recommendation; sales are often driven by liquidity or tax reasons.
Derivative holdings (Form 4 Table II)
Options, RSUs and convertible securities reported on Form 4 Table II.
| Date | Ticker | Security | Underlying | Exercise price | Expiration | Shares | A/D |
|---|---|---|---|---|---|---|---|
| Aug. 2, 2007 | DXCM | Non-Qualified Stock Option (right to buy) | Common Stock (35,677) | $7.79 | Aug. 2, 2017 | 35,677 | Acquired |
| Aug. 2, 2007 | DXCM | Incentive Stock Option (right to buy) | Common Stock (14,323) | $7.79 | Aug. 2, 2017 | 14,323 | Acquired |
Exercise/conversion price is blank when not applicable (e.g. RSUs).
Initial ownership (Form 3) 5 holdings
Securities held when first becoming an insider, per SEC Form 3.
| Date | Ticker | Security | Shares | Ownership |
|---|---|---|---|---|
| Aug. 6, 2007 | DXCM | Common Stock | 7,500 | Direct |
| Aug. 6, 2007 | DXCM | Incentive Stock Option (right to buy)→ Common Stock (22,500) | 22,500 | Direct |
| Aug. 6, 2007 | DXCM | Incentive Stock Option (right to buy)→ Common Stock (20,834) | 20,834 | Direct |
| Aug. 6, 2007 | DXCM | Non-Qualified Stock Option (right to buy)→ Common Stock (17,500) | 17,500 | Direct |
| Aug. 6, 2007 | DXCM | Non-Qualified Stock Option (right to buy)→ Common Stock (9,166) | 9,166 | Direct |