Insider at

04

Insider transactions

05
0 buys (P) 4 sells (S) Net: $-5,918,880 + 70 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

70 other filings hidden
DateTickerCodeSharesPriceValue Owned afterΔ ownA/Dvs now
May 8, 2026 PTGX S 5,130 $100.00 $513,000 12,695 Direct -28.78% Disposed 40.6% (price as of 2026-10-05)
May 8, 2026 PTGX S 6,000 $100.00 $600,000 0 Indirect -100.00% Disposed 40.6% (price as of 2026-10-05)
May 7, 2026 PTGX S 12,000 $100.07 $1,200,840 6,000 Indirect -66.67% Disposed 40.5% (price as of 2026-10-05)
May 7, 2026 PTGX S 36,000 $100.14 $3,605,040 27,825 Direct -56.40% Disposed 40.4% (price as of 2026-10-05)
June 18, 2024 GOSS P 100,000 $0.59 $59,000 480,010 Indirect +26.32% Acquired -77.4% (price as of 2026-10-05)
March 27, 2024 GOSS S 6,430 $1.16 $7,459 92,737 Direct -6.48% Disposed -88.5% (price as of 2026-10-05)
Nov. 13, 2023 GOSS P 200,000 $0.56 $112,000 380,010 Indirect +111.10% Acquired -76.2% (price as of 2026-10-05)
April 4, 2023 GOSS P 55,000 $1.02 $56,100 125,990 Indirect +77.48% Acquired -86.9% (price as of 2026-10-05)
March 20, 2023 GOSS P 50,000 $0.97 $48,500 70,990 Indirect +238.21% Acquired -86.3% (price as of 2026-10-05)
July 15, 2022 GOSS P 13,869 $7.21 $99,995 20,990 Indirect +194.76% Acquired -98.2% (price as of 2026-10-05)
March 23, 2022 GOSS S 10,722 $8.91 $95,533 99,167 Direct -9.76% Disposed -98.5% (price as of 2026-10-05)
March 23, 2021 GOSS S 5,490 $9.48 $52,045 109,889 Direct -4.76% Disposed -98.6% (price as of 2026-10-05)
Oct. 14, 2020 GOSS P 3,000 $10.01 $30,030 7,121 Indirect +72.80% Acquired -98.7% (price as of 2026-10-05)
June 23, 2020 GOSS P 2,000 $12.96 $25,920 4,121 Indirect +94.30% Acquired -99.0% (price as of 2026-10-05)
Dec. 3, 2019 PTGX P 8,000 $5.70 $45,600 8,000 Indirect · Acquired 2367.2% (price as of 2026-10-05)
Sept. 26, 2019 GOSS P 1,121 $16.78 $18,810 2,121 Indirect +112.10% Acquired -99.2% (price as of 2026-10-05)
May 30, 2019 GOSS P 1,000 $18.70 $18,700 1,000 Indirect · Acquired -99.3% (price as of 2026-10-05)
Feb. 12, 2019 GOSS P 6,000 $16.00 $96,000 23,879 Direct +33.56% Acquired -99.2% (price as of 2026-10-05)
May 16, 2017 PTGX P 10,000 $6.46 $64,600 10,000 Direct · Acquired 2076.9% (price as of 2026-10-05)

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.

06
DateTickerSecurityUnderlying Exercise priceExpirationSharesA/D
Aug. 24, 2026 GOSS Pre-Funded Warrant (Right to Buy) Series A-1 Preferred Stock [F1] $0.00 · 25 Acquired
Aug. 24, 2026 GOSS Stock Option (Right to Buy) Common Stock (5,800,051) $0.18 Aug. 23, 2036 5,800,051 Acquired
May 7, 2026 PTGX Stock Option (right to buy) Common Stock (24,000) $6.45 May 14, 2028 24,000 Disposed
May 7, 2026 PTGX Stock Option (right to buy) Common Stock (12,000) $6.98 May 28, 2028 12,000 Disposed
March 19, 2026 GOSS Stock Option (Right to Buy) Common Stock (693,750) $2.88 Jan. 1, 2036 693,750 Disposed
March 19, 2026 GOSS Stock Option (Right to Buy) Common Stock (638,000) $1.13 March 3, 2035 638,000 Disposed
March 19, 2026 GOSS Stock Option (Right to Buy) Common Stock (543,750) $0.97 Jan. 1, 2034 543,750 Disposed
March 19, 2026 GOSS Stock Option (Right to Buy) Common Stock (181,250) $0.84 Nov. 19, 2033 181,250 Disposed
March 19, 2026 GOSS Stock Option (Right to Buy) Common Stock (211,500) $1.21 March 19, 2033 211,500 Disposed
March 19, 2026 GOSS Stock Option (Right to Buy) Common Stock (211,500) $2.16 Dec. 6, 2032 211,500 Disposed
March 19, 2026 GOSS Stock Option (Right to Buy) Common Stock (176,667) $1.36 Jan. 5, 2032 176,667 Disposed
March 19, 2026 GOSS Stock Option (Right to Buy) Common Stock (100,000) $1.36 Sept. 16, 2031 100,000 Disposed
March 19, 2026 GOSS Stock Option (Right to Buy) Common Stock (60,000) $1.36 Feb. 25, 2031 60,000 Disposed
March 19, 2026 GOSS Stock Option (Right to Buy) Common Stock (47,667) $1.36 Feb. 14, 2030 47,667 Disposed
March 19, 2026 GOSS Stock Option (Right to Buy) Common Stock (96,667) $1.36 March 25, 2029 96,667 Disposed
March 19, 2026 GOSS Stock Option (Right to Buy) Common Stock (693,750) $0.45 Jan. 1, 2036 693,750 Acquired
March 19, 2026 GOSS Stock Option (Right to Buy) Common Stock (638,000) $0.45 March 3, 2025 638,000 Acquired
March 19, 2026 GOSS Stock Option (Right to Buy) Common Stock (543,750) $0.45 Jan. 1, 2034 543,750 Acquired
March 19, 2026 GOSS Stock Option (Right to Buy) Common Stock (181,250) $0.45 Nov. 19, 2033 181,250 Acquired
March 19, 2026 GOSS Stock Option (Right to Buy) Common Stock (211,500) $0.45 March 19, 2033 211,500 Acquired
March 19, 2026 GOSS Stock Option (Right to Buy) Common Stock (211,500) $0.45 Dec. 6, 2032 211,500 Acquired
March 19, 2026 GOSS Stock Option (Right to Buy) Common Stock (176,667) $0.45 Jan. 5, 2032 176,667 Acquired
March 19, 2026 GOSS Stock Option (Right to Buy) Common Stock (100,000) $0.45 Sept. 15, 2031 100,000 Acquired
March 19, 2026 GOSS Stock Option (Right to Buy) Common Stock (60,000) $0.45 Feb. 25, 2031 60,000 Acquired
March 19, 2026 GOSS Stock Option (Right to Buy) Common Stock (47,667) $0.45 Feb. 14, 2030 47,667 Acquired
March 19, 2026 GOSS Stock Option (Right to Buy) Common Stock (96,667) $0.45 March 25, 2029 96,667 Acquired
Jan. 2, 2026 PTGX Stock Option (right to buy) Common Stock (3,762) $87.18 Jan. 2, 2036 3,762 Acquired
Jan. 2, 2026 GOSS Stock Option (Right to Buy) Common Stock (693,750) $2.88 Jan. 1, 2036 693,750 Acquired
March 4, 2025 GOSS Stock Option (Right to Buy) Common Stock (638,000) $1.13 March 3, 2035 638,000 Acquired
Jan. 2, 2025 PTGX Stock Option (right to buy) Common Stock (6,584) $38.98 Jan. 2, 2035 6,584 Acquired
Jan. 2, 2024 GOSS Stock Option (Right to Buy) Common Stock (543,750) $0.97 Jan. 1, 2034 543,750 Acquired
Jan. 2, 2024 PTGX Stock Option (right to buy) Common Stock (25,700) $23.42 Jan. 2, 2034 25,700 Acquired
Nov. 20, 2023 GOSS Stock Option (Right to Buy) Common Stock (181,250) $0.84 Nov. 19, 2033 181,250 Acquired
July 24, 2023 GOSS Common Stock Common Stock Purchase Warrants (13,505) $2.04 July 24, 2028 13,505 Acquired
May 5, 2023 GOSS Stock Option (Right to Buy) Common Stock (145,000) $22.10 March 25, 2029 145,000 Disposed
May 5, 2023 GOSS Stock Option (Right to Buy) Common Stock (71,500) $14.55 Feb. 14, 2030 71,500 Disposed
May 5, 2023 GOSS Stock Option (Right to Buy) Common Stock (90,000) $9.79 Feb. 25, 2031 90,000 Disposed
May 5, 2023 GOSS Stock Option (Right to Buy) Common Stock (150,000) $10.54 Sept. 16, 2031 150,000 Disposed
May 5, 2023 GOSS Stock Option (Right to Buy) Common Stock (265,000) $11.94 Jan. 5, 2032 265,000 Disposed
May 5, 2023 GOSS Stock Option (Right to Buy) Common Stock (96,667) · March 25, 2029 96,667 Acquired
May 5, 2023 GOSS Stock Option (Right to Buy) Common Stock (47,667) · Feb. 14, 2030 47,667 Acquired
May 5, 2023 GOSS Stock Option (Right to Buy) Common Stock (60,000) · Feb. 25, 2031 60,000 Acquired
May 5, 2023 GOSS Stock Option (Right to Buy) Common Stock (100,000) · Sept. 16, 2031 100,000 Acquired
May 5, 2023 GOSS Stock Option (Right to Buy) Common Stock (176,667) · Jan. 5, 2032 176,667 Acquired
March 20, 2023 GOSS Stock Option (Right to Buy) Common Stock (211,500) $1.21 March 19, 2033 211,500 Acquired
Jan. 16, 2023 PTGX Stock Option (right to buy) Common Stock (30,000) $12.17 Jan. 15, 2033 30,000 Acquired
Dec. 7, 2022 GOSS Stock Option (Right to Buy) Common Stock (211,500) $2.16 Dec. 6, 2032 211,500 Acquired
May 26, 2022 PTGX Stock Option (right to buy) Common Stock (20,000) $8.31 May 26, 2032 20,000 Acquired
Jan. 6, 2022 GOSS Stock Option (Right to Buy) Common Stock (265,000) $11.94 Jan. 5, 2032 265,000 Acquired
Sept. 16, 2021 GOSS Stock Option (Right to Buy) Common Stock (150,000) $10.54 Sept. 16, 2031 150,000 Acquired
May 27, 2021 PTGX Stock Option (right to buy) Common Stock (18,000) $35.23 May 26, 2031 18,000 Acquired
Feb. 25, 2021 GOSS Stock Option (Right to Buy) Common Stock (90,000) $9.79 Feb. 25, 2031 90,000 Acquired
May 28, 2020 PTGX Stock Option (right to buy) Common Stock (15,000) $16.54 May 27, 2030 15,000 Acquired
Feb. 14, 2020 GOSS Stock Option (right to buy) Common Stock (71,500) $14.55 Feb. 14, 2030 71,500 Acquired
June 7, 2019 PTGX Stock Option (right to buy) Common Stock (12,000) $11.80 June 6, 2029 12,000 Acquired
March 25, 2019 GOSS Stock Option (right to buy) Common Stock (145,000) $22.10 March 25, 2029 145,000 Acquired
Feb. 12, 2019 GOSS Series B Preferred Stock Common Stock (5,181) · · 23,316 Disposed
Feb. 12, 2019 GOSS Series A Preferred Stock Common Stock (12,698) · · 57,142 Disposed
May 29, 2018 PTGX Stock Option (right to buy) Common Stock (12,000) $6.98 May 28, 2028 12,000 Acquired
May 15, 2018 PTGX Stock Option (right to buy) Common Stock (24,000) $6.45 May 14, 2028 24,000 Acquired

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

Initial ownership (Form 3) 4 holdings

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

DateTickerSecuritySharesOwnership
Feb. 7, 2019 GOSS Series A Preferred Stock→ Common Stock (12,698) 12,698 Direct
Feb. 7, 2019 GOSS Series B Preferred Stock→ Common Stock (5,181) 5,181 Direct
Feb. 7, 2019 GOSS Stock Option (Right to Buy)→ Common Stock (405,666) 405,666 Direct
Feb. 7, 2019 GOSS Stock Option (Right to Buy)→ Common Stock (155,555) 155,555 Direct

Compensation (DEF 14A)

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

Fiscal yearSalaryBonusStock awards Option awardsNon-equity incentivePension changeOtherTotal
2025 $519,830 · · · $152,913 · $4,000 $1,253,431
2024 $502,645 · · · $232,977 · $4,000 $1,171,904
2023 $485,624 · · · $218,467 · $4,000 $1,287,882

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