Alastair Riddell

CIK 1681349 · View on SEC EDGAR ↗

Insider

First SEC filing: Oct. 11, 2016 · Latest: Feb. 13, 2018

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Insider at

Insider transactions

0 buys (P) 0 sells (S) Net: $0 + 23 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
Jan. 2, 2024 GRDX A 19,633 — — 20,240 Direct +3234.43% Acquired (price as of 2026-08-21)
Jan. 3, 2023 GRDX A 84,745 — — 85,185 Direct +19260.23% Acquired (price as of 2026-08-21)
Jan. 3, 2022 GRDX A 34,482 — — 34,482 Direct — Acquired (price as of 2026-08-21)
Jan. 4, 2021 GRDX A 41,237 — — 41,237 Direct — Acquired (price as of 2026-08-21)
April 6, 2020 GRDX A 80,000 — — 80,000 Direct — Acquired (price as of 2026-08-21)
March 11, 2020 GRDX A 770 $4.74 $3,650 100,770 Direct +0.77% Acquired -100.0% (price as of 2026-08-21)
March 11, 2020 GRDX A 264 $4.74 $1,251 101,034 Direct +0.26% Acquired -100.0% (price as of 2026-08-21)
March 11, 2020 GRDX A 2,507 $3.99 $10,003 103,541 Direct +2.48% Acquired -100.0% (price as of 2026-08-21)
March 11, 2020 GRDX A 2,755 $3.63 $10,001 106,296 Direct +2.66% Acquired -100.0% (price as of 2026-08-21)
March 11, 2020 GRDX A 14,584 $0.60 $8,750 123,635 Direct +13.37% Acquired -100.0% (price as of 2026-08-21)
March 11, 2020 GRDX A 8,414 $1.04 $8,751 132,049 Direct +6.81% Acquired -100.0% (price as of 2026-08-21)
Dec. 31, 2019 GRDX A 7,500 $1.04 $7,800 100,000 Direct +8.11% Acquired -100.0% (price as of 2026-08-21)
Sept. 30, 2019 GRDX A 7,500 $0.60 $4,500 92,500 Direct +8.82% Acquired -100.0% (price as of 2026-08-21)
June 30, 2019 GRDX A 7,500 $1.70 $12,750 85,000 Direct +9.68% Acquired -100.0% (price as of 2026-08-21)
June 13, 2019 GRDX A 30,000 — — 30,000 Direct — Acquired (price as of 2026-08-21)
June 13, 2019 GRDX A 30,000 — — 107,500 Direct +38.71% Acquired (price as of 2026-08-21)
March 31, 2019 GRDX A 7,500 $2.42 $18,150 77,500 Direct +10.71% Acquired -100.0% (price as of 2026-08-21)
Dec. 28, 2018 GRDX A 7,500 $1.29 $9,675 70,000 Direct +12.00% Acquired -100.0% (price as of 2026-08-21)
Sept. 28, 2018 GRDX A 7,500 $2.57 $19,275 62,500 Direct +13.64% Acquired -100.0% (price as of 2026-08-21)
June 29, 2018 GRDX A 7,500 — — 55,000 Direct +15.79% Acquired (price as of 2026-08-21)
March 29, 2018 GRDX A 7,500 $3.14 $23,550 47,500 Direct +18.75% Acquired -100.0% (price as of 2026-08-21)
Oct. 19, 2017 GRDX A 22,500 — — 32,500 Direct +225.00% Acquired (price as of 2026-08-21)
Feb. 3, 2017 GRDX A 30,000 — — 30,000 Direct — Acquired (price as of 2026-08-21)

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
Jan. 3, 2022 GRDX Stock option (right to buy) Common stock, par value $0.0001 per share (34,482) $1.45 Jan. 3, 2032 34,482 Acquired
Jan. 4, 2021 GRDX Options (right to buy) Common stock, par value $0.0001 per share (41,237) $0.97 Jan. 3, 2031 41,237 Acquired
April 6, 2020 GRDX Options Common Stock (80,000) $0.97 April 6, 2030 80,000 Acquired
June 13, 2019 GRDX Options Common Stock (30,000) $1.75 June 13, 2024 30,000 Acquired
Feb. 3, 2017 GRDX Options Common Stock (30,000) $4.48 Feb. 3, 2027 30,000 Acquired

Exercise/conversion price is blank when not applicable (e.g. RSUs).

Initial ownership (Form 3) 1 holding

Securities held when first becoming an insider, per SEC Form 3.

Date Ticker Security Shares Ownership
Oct. 11, 2016 GRDX Common Stock 10,000 Direct