David Y Liu

CIK 1675881 · View on SEC EDGAR ↗

Insider

First SEC filing: Aug. 10, 2016 · Latest: Aug. 10, 2016

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Insider at

Insider transactions

0 buys (P) 0 sells (S) Net: $0 + 43 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

43 other filings hidden
Date Ticker Code Shares Price Value Owned after Δ own A/D vs now
Aug. 17, 2021 PTGX S 10b5-1 14,779 $47.56 $702,889 58,254 Direct -20.24% Disposed 219.3% (price as of 2026-08-21)
Aug. 6, 2019 PTGX S 3,395 $8.85 $30,046 49,802 Direct -6.38% Disposed 1615.8% (price as of 2026-08-21)
March 1, 2019 PTGX S 810 $8.03 $6,504 51,197 Direct -1.56% Disposed 1791.0% (price as of 2026-08-21)
Feb. 6, 2019 PTGX S 3,821 $7.74 $29,575 37,007 Direct -9.36% Disposed 1861.9% (price as of 2026-08-21)
March 12, 2018 PTGX S 10b5-1 3,500 $21.29 $74,515 15,028 Direct -18.89% Disposed 613.2% (price as of 2026-08-21)
March 2, 2018 PTGX S 10b5-1 875 $20.00 $17,500 13,322 Direct -6.16% Disposed 659.2% (price as of 2026-08-21)
Jan. 16, 2018 PTGX S 10b5-1 875 $20.00 $17,500 3,822 Direct -18.63% Disposed 659.2% (price as of 2026-08-21)
Dec. 18, 2017 PTGX S 10b5-1 875 $20.00 $17,500 3,822 Direct -18.63% Disposed 659.2% (price as of 2026-08-21)
Nov. 30, 2017 PTGX S 10b5-1 875 $20.00 $17,500 3,822 Direct -18.63% Disposed 659.2% (price as of 2026-08-21)
Nov. 13, 2017 PTGX S 10b5-1 3,500 $16.97 $59,395 3,822 Direct -47.80% Disposed 794.8% (price as of 2026-08-21)
Nov. 13, 2017 PTGX S 10b5-1 3,500 $16.97 $59,395 3,822 Direct -47.80% Disposed 794.8% (price as of 2026-08-21)
Aug. 28, 2017 PTGX S 10b5-1 3,500 $15.00 $52,500 2,000 Direct -63.64% Disposed 912.3% (price as of 2026-08-21)
July 10, 2017 PTGX S 10b5-1 3,500 $12.68 $44,380 2,000 Direct -63.64% Disposed 1097.6% (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
Nov. 16, 2022 PTGX Stock Option (right to buy) Common Stock (35,331) $4.21 April 29, 2026 35,331 Disposed
Nov. 16, 2022 PTGX Stock Option (right to buy) Common Stock (35,656) $1.16 Oct. 28, 2025 35,656 Disposed
Nov. 16, 2022 PTGX Stock Option (right to buy) Common Stock (5,999) $1.89 March 26, 2025 5,999 Disposed
Nov. 16, 2022 PTGX Stock Option (right to buy) Common Stock (9,726) $1.89 Oct. 22, 2024 9,726 Disposed
Nov. 16, 2022 PTGX Stock Option (right to buy) Common Stock (13,767) $0.87 Sept. 26, 2023 13,767 Disposed
Feb. 15, 2022 PTGX Stock Option (right to buy) Common Stock (60,000) $28.73 Feb. 14, 2032 60,000 Disposed
Aug. 17, 2021 PTGX Stock Option (right to buy) Common Stock (10,000) $0.87 Sept. 26, 2023 10,000 Disposed
Feb. 26, 2021 PTGX Stock Option (right to buy) Common Stock (65,000) $23.57 Feb. 25, 2031 65,000 Acquired
Feb. 28, 2020 PTGX Stock Option (right to buy) Common Stock (70,000) $7.80 Feb. 27, 2030 70,000 Acquired
Feb. 28, 2019 PTGX Employee Stock Option (right to buy) Common Stock (90,000) $8.02 Feb. 27, 2029 90,000 Acquired
Aug. 15, 2018 PTGX Stock Option (right to buy) Common Stock (17,200) $8.58 Aug. 14, 2028 17,200 Acquired
March 12, 2018 PTGX Employee Stock Option (right to buy) Common Stock (3,500) $4.21 April 29, 2026 3,500 Disposed
March 2, 2018 PTGX Employee Stock Option (right to buy) Common Stock (875) $1.89 Oct. 22, 2024 875 Disposed
Feb. 28, 2018 PTGX Employee Stock Option (right to buy) Common Stock (56,500) $16.95 Feb. 27, 2028 56,500 Acquired
Jan. 16, 2018 PTGX Employee Stock Option (right to buy) Common Stock (875) $1.89 Oct. 22, 2024 875 Disposed
Dec. 18, 2017 PTGX Employee Stock Option (right to buy) Common Stock (875) $1.89 Oct. 22, 2024 875 Disposed
Nov. 30, 2017 PTGX Employee Stock Option (right to buy) Common Stock (875) $1.89 Oct. 22, 2024 875 Disposed
Nov. 13, 2017 PTGX Employee Stock Option (right to buy) Common Stock (3,500) $1.89 Oct. 22, 2024 3,500 Disposed
Nov. 13, 2017 PTGX Employee Stock Option (right to buy) Common Stock (3,500) $4.21 April 29, 2026 3,500 Disposed
Aug. 28, 2017 PTGX Employee Stock Option (right to buy) Common Stock (3,500) $4.21 April 29, 2026 3,500 Disposed
July 10, 2017 PTGX Employee Stock Option (right to buy) Common Stock (3,500) $1.89 Oct. 22, 2024 3,500 Disposed
Oct. 11, 2016 PTGX Stock Option (right to buy) Common Stock (65,000) $21.58 Oct. 11, 2026 65,000 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. 10, 2016 PTGX Employee Stock Option (right to buy)→ Common Stock (23,767) 23,767 Direct
Aug. 10, 2016 PTGX Employee Stock Option (right to buy)→ Common Stock (20,225) 20,225 Direct
Aug. 10, 2016 PTGX Employee Stock Option (right to buy)→ Common Stock (5,998) 5,998 Direct
Aug. 10, 2016 PTGX Employee Stock Option (right to buy)→ Common Stock (35,656) 35,656 Direct
Aug. 10, 2016 PTGX Employee Stock Option (right to buy)→ Common Stock (45,831) 45,831 Direct

Compensation (DEF 14A)

Matched by name from proxy statements (DEF 14A) — verify against the filing.

PTGX

Ph.D. Former Chief Research and Development Strategy Officer(6)
Fiscal year Salary Bonus Stock awards Option awards Non-equity incentive Pension change Other Total
2021 $455,000 — $235,700 $1,132,261 $233,188 — $14,678 $2,070,827
2020 $441,300 — — $352,429 $266,987 — $11,133 $1,071,849
2019 $428,450 — $120,300 $424,881 $218,509 — $7,458 $1,199,598

Figures from the Summary Compensation Table of the company's proxy statement (DEF 14A). Compensation is not a recommendation.