PROTAGONIST THERAPEUTICS INC (PTGX) Institutional Shareholders
PROTAGONIST THERAPEUTICS INC (PTGX) is currently reported in institutional portfolios tracked by InsiderSet based on the latest available SEC Form 13F filings for the quarter ended June 30, 2026. The institutional investors covered on this page collectively reported approximately $8.45B in PTGX holdings during the latest filing period.
Blackrock, Inc. is currently the largest disclosed institutional shareholder of PTGX tracked by InsiderSet, reporting ownership valued at approximately $1.26B in its June 30, 2026 SEC Form 13F filing. Based on current market prices and the latest disclosed share count, the position is now estimated to be worth approximately $1.47B, representing an estimated gain of +16.53% since the filing period.
The top 10 institutional shareholders tracked on this page collectively account for approximately 57% of the total disclosed PTGX value among the investors covered in this analysis. Major shareholders include Blackrock, Inc., Rtw Investments, Lp, Vanguard Portfolio Management Llc, and several other long-term asset managers with concentrated positions in PROTAGONIST THERAPEUTICS INC (PTGX).
This page ranks the largest institutional PTGX shareholders using publicly disclosed SEC Form 13F data, including reported values, estimated current holding values, portfolio allocation percentages, ownership concentration metrics, and historical holding changes across major hedge funds and investment firms.
Institutional Holders
327
Total Reported Value
$8.45B
Largest Holder
Blackrock, Inc.
Largest Position
$1.26B
Insider Transactions (90d)
7
Latest Filing Quarter
Q2 2026
New Institutional Positions
66
Funds Exiting Positions
0
| Name | Investor/Manager | Portfolio % | Quantity | Reported Balance | Current Estimated Value | Gain/loss Since Filing | Estimated Portfolio Performance |
|---|---|---|---|---|---|---|---|
| Blackrock, Inc. | 0.02% | 10,307,837 | $1,263,534,678 | $1,472,371,437 | +$208,836,759 | +16.53% | |
| Rtw Investments, Lp | 5.30% | 5,061,175 | $620,398,832 | $722,938,237 | +$102,539,405 | +16.53% | |
| Vanguard Portfolio Management Llc | 0.02% | 3,629,298 | $444,879,349 | $518,408,926 | +$73,529,577 | +16.53% | |
| Wellington Management Group Llp | 0.07% | 3,416,781 | $418,829,015 | $488,052,998 | +$69,223,983 | +16.53% | |
| Ubs Group Ag | 0.07% | 3,399,221 | $416,676,511 | $485,544,728 | +$68,868,217 | +16.53% | |
| State Street Corp | 0.01% | 3,321,554 | $407,156,089 | $474,450,773 | +$67,294,684 | +16.53% | |
| Vanguard Capital Management Llc | 0.01% | 2,853,394 | $349,769,037 | $407,578,799 | +$57,809,762 | +16.53% | |
| Janus Henderson Group Plc | 0.15% | 2,891,527 | $304,866,424 | $413,025,717 | +$108,159,293 | +35.48% | |
| Johnson & Johnson | 37.59% | 2,449,183 | $300,220,852 | $349,841,300 | +$49,620,448 | +16.53% | |
| Invesco Ltd. | 0.02% | 2,340,667 | $286,918,961 | $334,340,874 | +$47,421,913 | +16.53% | |
| Price T Rowe Associates Inc | 0.03% | 2,149,662 | $263,507,000 | $307,057,720 | +$43,550,720 | +16.53% | |
| Geode Capital Management, Llc | 0.01% | 1,741,209 | $213,475,772 | $248,714,294 | +$35,238,522 | +16.51% | |
| Woodline Partners Lp | 0.54% | 1,414,173 | $173,349,326 | $202,000,471 | +$28,651,145 | +16.53% | |
| Bank Of America Corp | 0.01% | 1,324,498 | $162,356,964 | $189,191,294 | +$26,834,330 | +16.53% | |
| Jennison Associates Llc | 0.08% | 1,151,681 | $141,173,058 | $164,506,114 | +$23,333,056 | +16.53% | |
| Perceptive Advisors Llc | 1.87% | 981,879 | $120,358,728 | $140,251,596 | +$19,892,868 | +16.53% | |
| Adar1 Capital Management, Llc | 5.54% | 960,863 | $117,782,587 | $137,249,671 | +$19,467,084 | +16.53% | |
| Morgan Stanley | 0.01% | 905,992 | $111,056,578 | $129,411,897 | +$18,355,319 | +16.53% | |
| Alyeska Investment Group, L.P. | 0.28% | 889,298 | $109,010,149 | $127,027,326 | +$18,017,177 | +16.53% | |
| Hood River Capital Management Llc | 0.78% | 882,738 | $108,206,024 | $126,090,296 | +$17,884,272 | +16.53% | |
| Goldman Sachs Group Inc | 0.01% | 812,852 | $99,639,398 | $116,107,780 | +$16,468,382 | +16.53% | |
| Driehaus Capital Management Llc | 0.52% | 731,053 | $89,612,477 | $104,423,611 | +$14,811,134 | +16.53% | |
| Clearbridge Investments, Llc | 0.07% | 725,335 | $88,911,554 | $103,606,851 | +$14,695,297 | +16.53% | |
| Fmr Llc | 0.00% | 672,186 | $82,396,533 | $96,015,048 | +$13,618,515 | +16.53% | |
| Northern Trust Corp | 0.01% | 666,105 | $81,651,153 | $95,146,438 | +$13,495,285 | +16.53% | |
| American Century Companies Inc | 0.03% | 598,600 | $73,376,587 | $85,504,024 | +$12,127,437 | +16.53% | |
| Charles Schwab Investment Management Inc | 0.01% | 583,774 | $71,559,017 | $83,386,278 | +$11,827,261 | +16.53% | |
| Voya Investment Management Llc | 0.06% | 571,618 | $70,068,935 | $81,649,915 | +$11,580,980 | +16.53% | |
| Pictet Asset Management Holding Sa | 0.07% | 567,990 | $69,624,214 | $81,131,692 | +$11,507,478 | +16.53% | |
| Vanguard Fiduciary Trust Co | 0.01% | 437,747 | $53,659,027 | $62,527,781 | +$8,868,754 | +16.53% | |
| Lord, Abbett & Co. Llc | 0.14% | 398,994 | $48,909,000 | $56,992,303 | +$8,083,303 | +16.53% | |
| Principal Financial Group Inc | 0.02% | 385,262 | $47,225,415 | $55,030,824 | +$7,805,409 | +16.53% | |
| Bank Of New York Mellon Corp | 0.01% | 358,300 | $43,920,414 | $51,179,572 | +$7,259,158 | +16.53% | |
| Neuberger Berman Group Llc | 0.02% | 302,427 | $37,071,502 | $43,198,673 | +$6,127,171 | +16.53% | |
| Bnp Paribas Financial Markets | 0.02% | 301,472 | $36,954,438 | $43,062,260 | +$6,107,822 | +16.53% | |
| 683 Capital Management, Llc | 3.27% | 290,000 | $35,548,200 | $41,423,600 | +$5,875,400 | +16.53% | |
| Nuveen, Llc | 0.01% | 284,085 | $34,823,140 | $40,578,701 | +$5,755,561 | +16.53% | |
| Stephens Investment Management Group Llc | 0.37% | 281,832 | $34,546,967 | $40,256,883 | +$5,709,916 | +16.53% | |
| Bnp Paribas Asset Management Holding S.A. | 0.03% | 259,972 | $31,867,368 | $37,134,400 | +$5,267,032 | +16.53% | |
| Eagle Health Investments Lp | 5.05% | 248,322 | $30,439,311 | $35,470,314 | +$5,031,003 | +16.53% | |
| Nextbio Capital Management Lp | 12.37% | 219,333 | $26,885,839 | $31,329,526 | +$4,443,687 | +16.53% | |
| Segall Bryant & Hamill, Llc | 0.31% | 214,724 | $26,320,868 | $30,671,176 | +$4,350,308 | +16.53% | |
| Seb Asset Management Ab | 0.10% | 209,963 | $25,737,215 | $29,991,115 | +$4,253,900 | +16.53% | |
| Duquesne Family Office Llc | Stanley Druckenmiller | 0.59% | 208,900 | $25,607,000 | $29,839,276 | +$4,232,276 | +16.53% |
| Public Sector Pension Investment Board | 0.07% | 207,688 | $25,458,395 | $29,666,154 | +$4,207,759 | +16.53% | |
| Citigroup Inc | 0.01% | 198,668 | $24,352,723 | $28,377,737 | +$4,025,014 | +16.53% | |
| Jpmorgan Chase & Co | 0.00% | 183,098 | $22,569,540 | $26,153,718 | +$3,584,178 | +15.88% | |
| Dimensional Fund Advisors Lp | 0.00% | 178,152 | $21,836,172 | $25,447,232 | +$3,611,060 | +16.54% | |
| Affinity Asset Advisors, Llc | 1.03% | 172,125 | $21,099,083 | $24,586,335 | +$3,487,252 | +16.53% | |
| Fisher Asset Management, Llc | 0.01% | 170,524 | $20,902,831 | $24,357,648 | +$3,454,817 | +16.53% |
Frequently asked questions about PTGX
Who owns the most PTGX stock?
The largest holders of PTGX are typically major institutional investors such as asset managers and hedge funds reporting on Form 13F. The table above ranks tracked superinvestors by reported position size using the latest available filings for PROTAGONIST THERAPEUTICS INC (PTGX).
Is PTGX widely held by superinvestors?
Many widely followed stocks like PTGX appear across numerous superinvestor portfolios because of liquidity, index inclusion, and fundamentals. The holder count and table above show how broadly PTGX is represented among the institutional managers we track.
What do “Current Estimated Value”, “Gain/loss Since Filing”, and “Estimated Portfolio Performance” mean?
Current Estimated Value is reported share quantity from the latest 13F times our most recent split-adjusted U.S. session close. Gain/loss Since Filing is that estimate minus the reported 13F dollar value; Estimated Portfolio Performance is that difference as a percent of the reported value. Green means the estimate is above the filing value; red means below (not purchase cost). If many filers share the same implied filing price per share, the performance % may match across rows. These are not official fund marks or live quotes.