Company · Ownership research

Protagonist Therapeutics, Inc PTGX

CIK 0001377121 · CUSIP 74366E102

Insider trading Initial holdings Institutional holders

Quarter-end disclosures, not live holdings.

Several CUSIPs are reported for this company; this page shows CUSIP 74366E102 (PTGX), not CUSIP 74366E902 (PTGX), CUSIP 74366E952 (PTGX), CUSIP 074366E10 (PTGX), and does not merge CUSIPs.

This page lists the top 20 of 321 rows by value; the complete set is available through the API.

Some filings reported values in thousands; those figures were scaled ×1,000 to dollars.

Top 20 institutions

Weight means this stock's share of the manager's own portfolio.

By reported value

#	Manager	Value	Manager weight	Change vs prior	Source
01	BlackRock, Inc. CIK 2012383 · View history	$1.03B 9,779,369 shares	0.02%	+63.37K(+0.70%)Added	SEC filing ↗ May 13, 2026	▾
02	FARALLON CAPITAL MANAGEMENT LLC CIK 909661 · Amended · View history	$669.17M 6,348,906 shares	3.97%	+204.90K(+3.30%)Added	SEC filing ↗ May 15, 2026	▾
03	UBS Group AG CIK 1610520 · View history	$545.74M 5,177,796 shares	0.10%	+2.41M(+86.90%)Added	SEC filing ↗ May 5, 2026	▾
04	RTW INVESTMENTS, LP CIK 1493215 · View history	$533.22M 5,059,053 shares	5.31%	0(0.00%)Unchanged	SEC filing ↗ May 15, 2026	▾
05	WELLINGTON MANAGEMENT GROUP LLP CIK 902219 · View history	$379.40M 3,599,644 shares	0.07%	+428.22K(+13.50%)Added	SEC filing ↗ May 15, 2026	▾
06	VANGUARD PORTFOLIO MANAGEMENT LLC CIK 2100121 · Amended · View history	$366.92M 3,481,211 shares	0.02%	—	SEC filing ↗ May 8, 2026	▾
07	STATE STREET CORP CIK 93751 · View history	$328.51M 3,116,749 shares	0.01%	-82.98K(-2.60%)Reduced	SEC filing ↗ May 15, 2026	▾
08	JANUS HENDERSON GROUP PLC CIK 1274173 · Amended · View history	$304.87M 2,891,527 shares	0.15%	+241.55K(+9.10%)Added	SEC filing ↗ May 18, 2026	▾
09	VANGUARD CAPITAL MANAGEMENT LLC CIK 2100119 · Amended · View history	$295.74M 2,805,896 shares	0.01%	—	SEC filing ↗ May 15, 2026	▾
10	JOHNSON & JOHNSON CIK 200406 · View history	$258.14M 2,449,183 shares	39.57%	0(0.00%)Unchanged	SEC filing ↗ May 13, 2026	▾
11	Invesco Ltd. CIK 914208 · Amended · View history	$228.16M 2,164,670 shares	0.02%	+596.83K(+38.10%)Added	SEC filing ↗ May 12, 2026	▾
12	GEODE CAPITAL MANAGEMENT, LLC CIK 1214717 · View history	$175.98M 1,669,371 shares	0.01%	+216.44K(+14.90%)Added	SEC filing ↗ May 15, 2026	▾
13	PRICE T ROWE ASSOCIATES INC /MD/ CIK 80255 · View history	$175.54M 1,665,497 shares	0.02%	+264.76K(+18.90%)Added	SEC filing ↗ May 15, 2026	▾
14	CITADEL ADVISORS LLC CIK 1423053 · View history	$163.57M 1,551,900 shares	0.12%	+425.21K(+37.70%)Added	SEC filing ↗ May 15, 2026	▾
15	Woodline Partners LP CIK 1784547 · Amended · View history	$149.05M 1,414,173 shares	0.56%	+5.40K(+0.40%)Added	SEC filing ↗ May 15, 2026	▾
16	BANK OF AMERICA CORP /DE/ CIK 70858 · View history	$136.54M 1,295,434 shares	0.01%	+427.85K(+49.30%)Added	SEC filing ↗ May 18, 2026	▾
17	PERCEPTIVE ADVISORS LLC CIK 1224962 · Amended · View history	$129.73M 1,230,879 shares	2.56%	-119.55K(-8.90%)Reduced	SEC filing ↗ May 29, 2026	▾
18	JENNISON ASSOCIATES LLC CIK 53417 · View history	$112.99M 1,072,011 shares	0.08%	+740.85K(+223.70%)Added	SEC filing ↗ May 6, 2026	▾
19	MORGAN STANLEY CIK 895421 · View history	$107.32M 1,018,222 shares	0.01%	+139.20K(+15.80%)Added	SEC filing ↗ May 15, 2026	▾
20	ADAR1 Capital Management, LLC CIK 1940272 · View history	$104.78M 994,119 shares	6.30%	-55.05K(-5.20%)Reduced	SEC filing ↗ May 18, 2026	▾

Showing 20 / 321 institutions. The complete set is available through the API.

Coverage & totals by quarter

Reporting institutions

321

Cancelled or null records excluded

Disclosed shares

78,761,156

Not deduplicated across managers

Disclosed value

$8.30B

Not market cap or free float

Reporting institutions by quarter

Counts also change with data coverage and reporting entities; they do not measure net buying. Distinct managers with a live stock row in this CUSIP; totals may include overlapping filings and are not a share of the company.

Protagonist Therapeutics, Inc · Q1 2026

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Sources, coverage & how to read this data

Figures are as reported to the SEC and merged with later amendments where Akkru could match them. Preview limits apply to what is listed, not to the totals, which come from the complete reported data. Nothing is zero-filled: a missing quarter or month is shown as missing.