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Equibles

PHAT

Phathom Pharmaceuticals, Inc.

Company with tickers: PHAT

CIK
1783183
CUSIP
71722W107
Shares Outstanding
79,755,953
13F Activity (30d)
123 filings 121 filers

Institutional ownership from SEC Form 13F filings. Investment managers with more than $100 million in U.S. equities must disclose their positions every quarter, within 45 days of quarter-end, so the holdings shown can lag the market by up to a quarter.

Holders: 176
Total Value: $777,666,179
Total Shares: 69,996,966
Showing 1–100 of 180 holdings by value · page 1 of 2

Institutional Ownership Trend

25 quarters

Holder Concentration

Across 176 13F filers · Δ vs Dec 31, 2025
Top Holder
17.8%
Jun 2023 → Mar 2026 · range 13.9% – 23.5%
−2.0 pts
Top 5
46.2%
Jun 2023 → Mar 2026 · range 42.7% – 52.9%
−2.9 pts
Top 10
62.7%
Jun 2023 → Mar 2026 · range 60.5% – 71.4%
−4.5 pts
HHI
635
Jun 2023 → Mar 2026 · range 537 – 883
Broadly held −102

Quarterly Activity

vs Dec 31, 2025
New
38
Increased
75
Decreased
41
Sold Out
36
Unchanged
22
Holder count: +2
Institutional value: -25.5%
Shares held: +11.3%

Top Buyers

vs Dec 31, 2025
Institution Added Now Holds Open
Mega MILLENNIUM MANAGEMENT LLC +1,940,729 4,022,909
Mega CITADEL ADVISORS LLC +507,943 918,158
Mega BlackRock, Inc. +506,448 4,061,996
Mid SummitTX Capital, L.P. +478,065 995,885
Mega TWO SIGMA INVESTMENTS, LP +424,353 482,136

Top Sellers

vs Dec 31, 2025
Institution Sold Now Holds Open
Large Ensign Peak Advisors, Inc −724,214 1,627,806
Small Catalio Capital Management, LP −451,229 247,767
Mega SUSQUEHANNA INTERNATIONAL GROUP, LLP −427,592 458,079
Mega JANE STREET GROUP, LLC −320,670 88,200
Mid Brevan Howard Capital Management LP −182,351 94,638

Top New Positions

vs Dec 31, 2025
Institution Acquired Value (USD) Open
Mega VANGUARD CAPITAL MANAGEMENT LLC 2,583,636 $28,704,195
Large NOMURA ASSET MANAGEMENT INTERNATIONAL INC. 1,205,369 $13,391,649
Mega FRANKLIN RESOURCES INC 994,504 $11,048,939
Mid PERCEPTIVE ADVISORS LLC 925,000 $10,276,750
Large MARSHALL WACE, LLP 860,692 $9,562,288

Top Sold-Out Positions

vs Dec 31, 2025
Institution Previously Held Last Value (USD) Open
Mega VANGUARD GROUP INC 3,177,211 $52,709,928
Mid Divisadero Street Capital Management, LP 662,312 $10,987,756
Mid MOORE CAPITAL MANAGEMENT, LP 600,000 $9,954,000
Large Caption Management, LLC 486,300 $8,067,717
Mid NEXT CENTURY GROWTH INVESTORS LLC 393,774 $6,532,710
Filter: New 38 Increased 75 Reduced 41 Sold out 36 Unchanged 22
Showing 100 of 180
All Common Calls Puts
Export CSV
Holder Value (USD) % of 13F Shares Open
Mid Frazier Life Sciences Management, L.P. $138,502,692 17.81% 12,466,489
Small Medicxi Ventures Management (Jersey) Ltd $82,931,394 10.66% 7,464,572
Mega Invesco Ltd. $48,018,084 6.17% 4,322,060
Mega BlackRock, Inc. $45,128,769 5.80% 4,061,996
Mega MILLENNIUM MANAGEMENT LLC $44,694,518 5.75% 4,022,909
Large Carlyle Group Inc. $38,849,536 5.00% 3,496,808
Mega VANGUARD CAPITAL MANAGEMENT LLC $28,704,195 3.69% 2,583,636
Mid NEA Management Company, LLC $21,777,477 2.80% 1,960,169
Mid 683 Capital Management, LLC $20,553,500 2.64% 1,850,000
Large Ensign Peak Advisors, Inc $18,084,924 2.33% 1,627,806
Small Catalys Pacific, LLC $16,596,717 2.13% 1,493,854
Large GW&K Investment Management, LLC $15,788,520 2.03% 1,421,109
Mega STATE STREET CORP $15,408,347 1.98% 1,386,890
Large WASATCH ADVISORS LP $14,897,576 1.92% 1,340,916
Mega GEODE CAPITAL MANAGEMENT, LLC $14,754,579 1.90% 1,328,045
Large NOMURA ASSET MANAGEMENT INTERNATIONAL INC. $13,391,649 1.72% 1,205,369
Mid SummitTX Capital, L.P. $11,064,282 1.42% 995,885
Mega FRANKLIN RESOURCES INC $11,048,939 1.42% 994,504
Mid PERCEPTIVE ADVISORS LLC $10,276,750 1.32% 925,000
Large MARSHALL WACE, LLP $9,562,288 1.23% 860,692
Small Propel Bio Management, LLC $9,346,531 1.20% 841,272
Mega VANGUARD PORTFOLIO MANAGEMENT LLC $7,399,582 0.95% 666,029
Mega GOLDMAN SACHS GROUP INC $6,957,036 0.89% 626,196
Mid EcoR1 Capital, LLC $6,943,750 0.89% 625,000
Mega CITADEL ADVISORS LLC $5,731,649 0.74% 515,900
Mega TWO SIGMA INVESTMENTS, LP $5,356,530 0.69% 482,136
Small StepStone Group LP $4,689,364 0.60% 422,085
Mega NORTHERN TRUST CORP Bank $4,610,159 0.59% 414,956
Mega CHARLES SCHWAB INVESTMENT MANAGEMENT INC $4,544,156 0.58% 409,015
Mega CITADEL ADVISORS LLC $4,255,773 0.55% 383,058
Large Woodline Partners LP $4,100,167 0.53% 369,052
Mega UBS Group AG $4,003,721 0.51% 360,371
Mega VANGUARD FIDUCIARY TRUST CO Bank $3,763,101 0.48% 338,713
Mega SUSQUEHANNA INTERNATIONAL GROUP, LLP $3,597,418 0.46% 323,800
Large RENAISSANCE TECHNOLOGIES LLC $3,397,438 0.44% 305,800
Large Trexquant Investment LP $3,258,618 0.42% 293,305
Mega JPMORGAN CHASE & CO $3,193,346 0.41% 287,430
Large Squarepoint Ops LLC $3,057,038 0.39% 275,161
Mid Susquehanna Portfolio Strategies, LLC $2,977,057 0.38% 267,962
Small Simplify Asset Management Inc. $2,915,108 0.37% 262,386
Mega AMERIPRISE FINANCIAL INC $2,824,372 0.36% 254,219
Small Avidity Partners Management LP $2,770,722 0.36% 249,390
Small Catalio Capital Management, LP $2,752,691 0.35% 247,767
Mega BANK OF AMERICA CORP /DE/ Bank $2,312,157 0.30% 208,115
Small Birchview Capital, LP $2,166,450 0.28% 195,000
Large NewEdge Advisors, LLC $2,033,130 0.26% 183,000
Mid XTX Topco Ltd $1,783,166 0.23% 160,501
Mid Hennion & Walsh Asset Management, Inc. $1,621,304 0.21% 145,932
Mid GILDER GAGNON HOWE & CO LLC $1,554,166 0.20% 139,889
Mega D. E. Shaw & Co., Inc. $1,471,597 0.19% 132,457
Mega Bank of New York Mellon Corp Bank $1,377,838 0.18% 124,018
Mid SIG BROKERAGE, LP Broker-Dealer $1,333,200 0.17% 120,000
Mega Nuveen, LLC $1,303,213 0.17% 117,301
Mega WELLINGTON MANAGEMENT GROUP LLP $1,241,563 0.16% 111,752
Mid Stratos Wealth Partners, LTD. $1,111,000 0.14% 100,000
Mid GSA CAPITAL PARTNERS LLP $1,078,425 0.14% 97,068
Large Balyasny Asset Management L.P. $1,058,794 0.14% 95,301
Mid Brevan Howard Capital Management LP $1,051,428 0.14% 94,638
Mega SUSQUEHANNA INTERNATIONAL GROUP, LLP $1,032,996 0.13% 92,979
Mega Swiss National Bank Bank $1,028,786 0.13% 92,600
Mega JANE STREET GROUP, LLC $979,902 0.13% 88,200
Large Russell Investments Group, Ltd. $951,936 0.12% 85,683
Large Freestone Grove Partners LP $939,606 0.12% 84,573
Small HUSSMAN STRATEGIC ADVISORS, INC. $933,240 0.12% 84,000
Large KBC Group NV $857,014 0.11% 77,139
Mega MORGAN STANLEY $851,922 0.11% 76,681
Mid Burkehill Global Management, LP $833,250 0.11% 75,000
Mid Engineers Gate Manager LP $820,451 0.11% 73,848
Large Creative Planning $779,844 0.10% 70,193
Micro Penn Mutual Asset Management $697,730 0.09% 62,802
Mid Campbell & CO Investment Adviser LLC $689,075 0.09% 62,023
Small Virtus Investment Advisers, LLC $644,224 0.08% 57,986
Mega UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC $619,804 0.08% 55,788
Mega AQR CAPITAL MANAGEMENT LLC $616,247 0.08% 55,468
Mega RHUMBLINE ADVISERS $615,927 0.08% 55,439
Small DIADEMA PARTNERS LP $607,161 0.08% 54,650
Large STIFEL FINANCIAL CORP $600,372 0.08% 54,039
Mega PRICE T ROWE ASSOCIATES INC /MD/ $582,752 0.07% 52,453
Small Stonepine Capital Management, LLC $555,611 0.07% 50,010
Mega ALLIANCEBERNSTEIN L.P. $548,722 0.07% 49,390
Mega WELLS FARGO & COMPANY/MN $512,315 0.07% 46,113
Large STATE OF WISCONSIN INVESTMENT BOARD $488,884 0.06% 44,004
Mid ADAR1 Capital Management, LLC $476,619 0.06% 42,900
Mega SUSQUEHANNA INTERNATIONAL GROUP, LLP $458,843 0.06% 41,300
Mid Aquatic Capital Management LLC $453,865 0.06% 40,852
Large CALIFORNIA STATE TEACHERS RETIREMENT SYSTEM Pension $446,866 0.06% 40,222
Mid ALGERT GLOBAL LLC $437,956 0.06% 39,420
Small VARCOV Co. $435,212 0.06% 39,173
Large TUDOR INVESTMENT CORP ET AL $424,679 0.05% 38,225
Mega DEUTSCHE BANK AG\ Bank $405,058 0.05% 36,459
Mid TOCQUEVILLE ASSET MANAGEMENT L.P. $391,072 0.05% 35,200
Mid ALLSTATE CORP $363,152 0.05% 32,687
Large COMMONWEALTH EQUITY SERVICES, LLC $358,075 0.05% 32,230
Mega Legal & General Group Plc $355,931 0.05% 32,037
Large Man Group plc $337,210 0.04% 30,352
Mega CITIGROUP INC $326,288 0.04% 29,369
Mega VANGUARD ASSET MANAGEMENT, Ltd $316,701 0.04% 28,506
Small Kera Capital Partners, Inc. $298,036 0.04% 26,826
Small Persistent Asset Partners Ltd $297,369 0.04% 26,766
Mega Vanguard Global Advisers, LLC $294,537 0.04% 26,511

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