Protagonist Therapeutics, Inc (PTGX) stock
PTGXNasdaqPharmaceutical PreparationsFiscal year ends December 31
Financials through Q2 FY2026, quarter ended Jun 30, 2026Last filing: 10-Q on Aug 5, 2026Score 12/30299% above fair value
$144.85+0.51 (+0.35%)
Close on Oct 30, 2026Market cap $9.37BP/E 140.6Yield –
Price history
Protagonist Therapeutics share prices for every month, newest first. Adjusted for stock splits, not for dividends.
Close, Oct 30, 2026
$144.85
+0.35% on the day
52-week range
$75.44 – $160.81
-9.9% from the high
Change over 52 weeks
+86.1%
From $77.85 on Oct 30, 2025
Average volume
682,974
Shares a day, last 90 sessions
| Month | Open | High | Low | Close | Change | Volume |
|---|---|---|---|---|---|---|
| Oct 2026 | $139.23 | $152.19 | $126.39 | $144.85 | +2.81% | 16,338,863 |
| Sep 2026 | $147.75 | $151.24 | $134.10 | $140.89 | -4.64% | 14,513,284 |
| Aug 2026 | $135.78 | $160.81 | $131.68 | $147.75 | +8.13% | 10,435,199 |
| Jul 2026 | $122.96 | $143.29 | $122.48 | $136.64 | +11.47% | 15,236,410 |
| Jun 2026 | $97.88 | $126.59 | $92.75 | $122.58 | +23.12% | 18,183,792 |
| May 2026 | $99.16 | $105.72 | $96.69 | $99.56 | +0.60% | 10,381,410 |
| Apr 2026 | $105.51 | $107.84 | $95.40 | $98.97 | -6.10% | 14,352,090 |
| Mar 2026 | $92.08 | $105.99 | $87.82 | $105.40 | +14.47% | 21,286,913 |
| Feb 2026 | $81.80 | $92.23 | $77.00 | $92.08 | +12.57% | 11,471,553 |
| Jan 2026 | $86.54 | $88.16 | $77.70 | $81.80 | -6.34% | 17,405,566 |
| Dec 2025 | $89.61 | $96.54 | $83.52 | $87.34 | -2.96% | 20,704,467 |
| Nov 2025 | $78.62 | $90.85 | $75.44 | $90.00 | +14.47% | 17,243,915 |
| Oct 2025 | $66.00 | $93.25 | $62.24 | $78.62 | +18.35% | 33,480,186 |
| Sep 2025 | $59.40 | $68.26 | $54.50 | $66.43 | +12.50% | 24,798,911 |
| Aug 2025 | $54.01 | $61.89 | $50.49 | $59.05 | +9.64% | 13,944,960 |
| Jul 2025 | $55.57 | $57.73 | $49.38 | $53.86 | -2.55% | 15,784,861 |
| Jun 2025 | $48.00 | $57.70 | $47.53 | $55.27 | +16.43% | 20,992,414 |
| May 2025 | $45.23 | $47.74 | $41.29 | $47.47 | +3.60% | 17,009,067 |
| Apr 2025 | $47.99 | $48.93 | $39.60 | $45.82 | -5.25% | 26,620,251 |
| Mar 2025 | $40.81 | $60.60 | $37.20 | $48.36 | +28.65% | 34,421,090 |
| Feb 2025 | $37.08 | $39.90 | $33.70 | $37.59 | -0.56% | 13,303,785 |
| Jan 2025 | $38.85 | $40.16 | $35.03 | $37.80 | -2.07% | 11,102,346 |
| Dec 2024 | $43.07 | $43.83 | $38.04 | $38.60 | -11.87% | 13,842,394 |
| Nov 2024 | $46.11 | $48.86 | $33.31 | $43.80 | -4.45% | 17,195,963 |
| Oct 2024 | $44.81 | $48.89 | $42.78 | $45.84 | +1.87% | 10,825,331 |
| Sep 2024 | $42.32 | $48.00 | $40.67 | $45.00 | +4.92% | 15,234,374 |
| Aug 2024 | $37.42 | $43.76 | $32.50 | $42.89 | +14.56% | 13,876,497 |
| Jul 2024 | $34.76 | $42.67 | $33.21 | $37.44 | +8.05% | 28,958,606 |
| Jun 2024 | $28.52 | $35.96 | $28.36 | $34.65 | +23.09% | 18,554,963 |
| May 2024 | $25.18 | $32.64 | $24.78 | $28.15 | +12.11% | 11,137,114 |
| Apr 2024 | $28.77 | $29.21 | $24.22 | $25.11 | -13.20% | 11,981,993 |
| Mar 2024 | $30.58 | $33.34 | $27.59 | $28.93 | -4.77% | 12,544,925 |
| Feb 2024 | $26.60 | $31.40 | $25.07 | $30.38 | +21.47% | 15,956,633 |
| Jan 2024 | $22.95 | $28.10 | $21.43 | $25.01 | +9.07% | 16,699,924 |
| Dec 2023 | $18.12 | $23.88 | $17.70 | $22.93 | +25.92% | 17,057,685 |
| Nov 2023 | $14.54 | $18.68 | $14.43 | $18.21 | +25.24% | 12,269,917 |
| Oct 2023 | $16.80 | $16.84 | $13.72 | $14.54 | -12.83% | 14,469,990 |
| Sep 2023 | $19.98 | $20.23 | $16.33 | $16.68 | -15.84% | 14,432,608 |
| Aug 2023 | $19.28 | $20.58 | $17.82 | $19.82 | +2.16% | 13,395,580 |
| Jul 2023 | $26.70 | $26.81 | $16.65 | $19.40 | -29.76% | 27,319,082 |
| Jun 2023 | $25.85 | $30.10 | $25.71 | $27.62 | +5.95% | 25,146,514 |
| May 2023 | $22.60 | $27.10 | $22.60 | $26.07 | +15.35% | 20,935,179 |
| Apr 2023 | $23.00 | $24.48 | $17.64 | $22.60 | -1.74% | 23,376,236 |
| Mar 2023 | $16.22 | $25.69 | $15.01 | $23.00 | +41.80% | 58,892,418 |
| Feb 2023 | $13.28 | $17.97 | $13.18 | $16.22 | +22.05% | 24,063,337 |
| Jan 2023 | $11.02 | $13.89 | $10.62 | $13.29 | +21.81% | 19,295,336 |
| Dec 2022 | $7.92 | $11.46 | $7.45 | $10.91 | +37.93% | 21,410,533 |
| Nov 2022 | $8.25 | $8.64 | $7.24 | $7.91 | -2.35% | 13,744,284 |
| Oct 2022 | $9.06 | $9.08 | $7.87 | $8.10 | -3.91% | 13,968,904 |
| Sep 2022 | $8.65 | $9.35 | $7.68 | $8.43 | -3.33% | 20,779,735 |
| Aug 2022 | $9.90 | $11.97 | $8.56 | $8.72 | -12.36% | 20,628,381 |
| Jul 2022 | $7.94 | $10.68 | $7.71 | $9.95 | +25.79% | 20,030,575 |
| Jun 2022 | $8.85 | $9.51 | $6.91 | $7.91 | -9.70% | 27,209,340 |
| May 2022 | $9.07 | $10.26 | $7.39 | $8.76 | -3.63% | 27,992,564 |
| Apr 2022 | $23.84 | $25.76 | $8.63 | $9.09 | -61.61% | 32,554,037 |
| Mar 2022 | $24.29 | $27.97 | $22.93 | $23.68 | -2.47% | 14,774,866 |
| Feb 2022 | $29.89 | $30.42 | $22.56 | $24.28 | -17.10% | 15,098,302 |
| Jan 2022 | $34.19 | $37.05 | $25.96 | $29.29 | -14.36% | 14,648,573 |
| Dec 2021 | $33.99 | $35.16 | $28.20 | $34.20 | +1.73% | 12,815,750 |
| Nov 2021 | $31.60 | $38.11 | $31.06 | $33.62 | +7.89% | 11,739,085 |
| Oct 2021 | $17.72 | $37.10 | $17.26 | $31.16 | +75.85% | 63,460,160 |
| Sep 2021 | $48.40 | $50.54 | $12.80 | $17.72 | -63.46% | 50,461,060 |
| Aug 2021 | $49.67 | $50.49 | $45.77 | $48.50 | -1.88% | 6,602,565 |
| Jul 2021 | $44.99 | $49.50 | $43.19 | $49.43 | +10.14% | 7,794,324 |
| Jun 2021 | $35.00 | $45.93 | $33.33 | $44.88 | +27.83% | 13,034,896 |
| May 2021 | $29.28 | $36.50 | $26.97 | $35.11 | +21.32% | 6,797,775 |
| Apr 2021 | $26.06 | $30.48 | $24.14 | $28.94 | +11.74% | 5,783,772 |
| Mar 2021 | $24.01 | $32.10 | $24.01 | $25.90 | +9.89% | 8,804,031 |
| Feb 2021 | $21.06 | $27.24 | $20.11 | $23.57 | +13.81% | 6,446,373 |
| Jan 2021 | $20.31 | $25.50 | $18.82 | $20.71 | +2.73% | 8,058,753 |
| Dec 2020 | $24.02 | $25.65 | $19.21 | $20.16 | -16.56% | 14,615,863 |
| Nov 2020 | $19.14 | $24.96 | $18.75 | $24.16 | +27.49% | 7,393,719 |
| Oct 2020 | $19.87 | $22.80 | $17.44 | $18.95 | -3.07% | 6,858,870 |
| Sep 2020 | $22.30 | $23.25 | $19.04 | $19.55 | -12.72% | 8,535,946 |
| Aug 2020 | $15.82 | $22.68 | $14.16 | $22.40 | +42.40% | 6,918,338 |
| Jul 2020 | $17.63 | $18.99 | $14.90 | $15.73 | -10.93% | 5,564,582 |
| Jun 2020 | $16.24 | $19.67 | $15.28 | $17.66 | +6.84% | 12,620,421 |
| May 2020 | $6.65 | $17.84 | $6.13 | $16.53 | +144.89% | 53,006,962 |
| Apr 2020 | $6.77 | $7.72 | $6.00 | $6.75 | -4.39% | 2,584,705 |
| Mar 2020 | $7.83 | $9.24 | $5.30 | $7.06 | -9.49% | 3,781,002 |
| Feb 2020 | $7.58 | $9.30 | $7.50 | $7.80 | +3.31% | 2,874,585 |
| Jan 2020 | $7.09 | $7.70 | $6.52 | $7.55 | +7.09% | 4,033,428 |
| Dec 2019 | $8.71 | $9.06 | $4.47 | $7.05 | -18.97% | 30,916,623 |
| Nov 2019 | $13.39 | $13.77 | $7.39 | $8.70 | -35.32% | 7,681,050 |
| Oct 2019 | $11.98 | $13.67 | $10.63 | $13.45 | +11.99% | 2,991,105 |
| Sep 2019 | $12.92 | $16.67 | $11.85 | $12.01 | -7.83% | 4,533,117 |
| Aug 2019 | $11.02 | $13.48 | $8.26 | $13.03 | +18.24% | 4,981,185 |
| Jul 2019 | $12.10 | $14.03 | $10.95 | $11.02 | -9.00% | 4,324,462 |
| Jun 2019 | $10.09 | $12.55 | $9.50 | $12.11 | +20.38% | 7,598,577 |
| May 2019 | $10.30 | $11.55 | $8.88 | $10.06 | -2.61% | 3,612,933 |
| Apr 2019 | $12.61 | $13.14 | $9.61 | $10.33 | -17.82% | 3,220,040 |
| Mar 2019 | $8.03 | $14.36 | $8.03 | $12.57 | +56.73% | 4,953,365 |
| Feb 2019 | $8.14 | $8.73 | $6.95 | $8.02 | -1.60% | 1,890,714 |
| Jan 2019 | $6.61 | $8.50 | $6.38 | $8.15 | +21.10% | 3,116,713 |
| Dec 2018 | $6.78 | $7.45 | $6.18 | $6.73 | +4.02% | 1,556,843 |
| Nov 2018 | $8.03 | $10.15 | $5.49 | $6.47 | -19.02% | 2,755,113 |
| Oct 2018 | $10.39 | $10.50 | $7.62 | $7.99 | -22.35% | 2,021,867 |
| Sep 2018 | $9.60 | $11.20 | $8.07 | $10.29 | +6.85% | 2,907,414 |
| Aug 2018 | $6.94 | $11.90 | $6.81 | $9.63 | +39.16% | 11,347,407 |
| Jul 2018 | $6.69 | $8.07 | $6.57 | $6.92 | +2.98% | 2,725,710 |
| Jun 2018 | $7.33 | $7.49 | $6.41 | $6.72 | -7.69% | 6,476,363 |
| May 2018 | $8.61 | $9.00 | $5.50 | $7.28 | -15.74% | 6,033,104 |
| Apr 2018 | $8.62 | $9.44 | $8.01 | $8.64 | +0.58% | 3,293,967 |
| Mar 2018 | $17.28 | $23.97 | $7.85 | $8.59 | -49.32% | 8,633,095 |
| Feb 2018 | $22.76 | $23.75 | $16.32 | $16.95 | -25.85% | 1,689,141 |
| Jan 2018 | $21.05 | $23.10 | $18.65 | $22.86 | +9.90% | 2,768,645 |
| Dec 2017 | $19.50 | $21.31 | $17.41 | $20.80 | +6.67% | 2,104,575 |
| Nov 2017 | $15.17 | $20.43 | $14.10 | $19.50 | +30.26% | 2,634,172 |
| Oct 2017 | $17.67 | $19.95 | $14.75 | $14.97 | -15.28% | 3,278,231 |
| Sep 2017 | $16.46 | $18.37 | $14.13 | $17.67 | +8.21% | 1,105,730 |
| Aug 2017 | $12.44 | $17.18 | $10.26 | $16.33 | +33.96% | 1,521,987 |
| Jul 2017 | $11.44 | $14.12 | $11.15 | $12.19 | +7.78% | 1,548,339 |
| Jun 2017 | $11.41 | $12.33 | $10.25 | $11.31 | +1.25% | 2,906,213 |
| May 2017 | $10.50 | $14.85 | $8.00 | $11.17 | +10.38% | 3,935,730 |
| Apr 2017 | $12.89 | $13.43 | $9.93 | $10.12 | -21.00% | 376,706 |
| Mar 2017 | $14.00 | $14.95 | $12.10 | $12.81 | -7.58% | 881,062 |
| Feb 2017 | $18.63 | $19.84 | $13.51 | $13.86 | -23.17% | 605,802 |
| Jan 2017 | $22.26 | $22.50 | $16.59 | $18.04 | -17.96% | 630,637 |
| Dec 2016 | $25.07 | $26.36 | $19.26 | $21.99 | -11.86% | 1,135,504 |
| Nov 2016 | $19.00 | $25.60 | $17.45 | $24.95 | +32.71% | 730,613 |
| Oct 2016 | $21.35 | $22.86 | $17.80 | $18.80 | -11.03% | 1,361,542 |
| Sep 2016 | $12.01 | $22.56 | $11.61 | $21.13 | +75.94% | 3,648,100 |
| Aug 2016 | $12.00 | $12.89 | $10.02 | $12.01 | – | 3,170,700 |
Seasonality
PTGX return in each calendar month over the last 10 years, including dividends. The current month runs to the latest close.
| Year | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Average | 3.1% | 0.5% | 7.8% | -11.9% | 18.6% | 10.7% | 1.4% | 15.4% | -7.5% | 5.3% | 4.9% | 2.9% |
| Months up | 6 of 10 | 5 of 10 | 5 of 10 | 2 of 10 | 7 of 10 | 8 of 10 | 6 of 10 | 8 of 10 | 4 of 10 | 5 of 10 | 5 of 9 | 5 of 9 |
| 2026 | -6.3% | 12.6% | 14.5% | -6.1% | 0.6% | 23.1% | 11.5% | 8.1% | -4.6% | 2.8% | ||
| 2025 | -2.1% | -0.6% | 28.7% | -5.3% | 3.6% | 16.4% | -2.6% | 9.6% | 12.5% | 18.4% | 14.5% | -3.0% |
| 2024 | 9.1% | 21.5% | -4.8% | -13.2% | 12.1% | 23.1% | 8.1% | 14.6% | 4.9% | 1.9% | -4.5% | -11.9% |
| 2023 | 21.8% | 22.0% | 41.8% | -1.7% | 15.4% | 5.9% | -29.8% | 2.2% | -15.8% | -12.8% | 25.2% | 25.9% |
| 2022 | -14.4% | -17.1% | -2.5% | -61.6% | -3.6% | -9.7% | 25.8% | -12.4% | -3.3% | -3.9% | -2.3% | 37.9% |
| 2021 | 2.7% | 13.8% | 9.9% | 11.7% | 21.3% | 27.8% | 10.1% | -1.9% | -63.5% | 75.8% | 7.9% | 1.7% |
| 2020 | 7.1% | 3.3% | -9.5% | -4.4% | 144.9% | 6.8% | -10.9% | 42.4% | -12.7% | -3.1% | 27.5% | -16.6% |
| 2019 | 21.1% | -1.6% | 56.7% | -17.8% | -2.6% | 20.4% | -9.0% | 18.2% | -7.8% | 12.0% | -35.3% | -19.0% |
| 2018 | 9.9% | -25.9% | -49.3% | 0.6% | -15.7% | -7.7% | 3.0% | 39.2% | 6.9% | -22.4% | -19.0% | 4.0% |
| 2017 | -18.0% | -23.2% | -7.6% | -21.0% | 10.4% | 1.3% | 7.8% | 34.0% | 8.2% | -15.3% | 30.3% | 6.7% |