Latest Period
Q1 2026
Security Snapshot
Phathom Pharmaceuticals, Inc. - Common Stock, par value $0.0001 per share (PHAT) Institutional Ownership
CUSIP: 71722W107
13F Institutional Holders and Ownership History from Q4 2019 to Q1 2026
Institutions Reporting
173
Shares (Excl. Options)
68,888,502
Price
$11.11
Save this security page for your next review
Keep this CUSIP in your watchlists so you can revisit quarter changes from one place. If you create an account from here, we will bring you back after verification.
- Security type / class
- Equity / Common Stock, par value $0.0001 per share
- Symbol
- PHAT on Nasdaq
- All holders as of 31 Mar 2026
- Q1 2026
- Total 13F shares
- 68,888,502
- Total 13F value
- $765,464,373
- Portfolio coverage rank
- 0%
- Share change
- +6,449,314
- Value change
- +$57,584,262
- Number of holders
- 173
- Shares outstanding
- 78,837,943
- SEC-reported price per share
- $10.74
- Insider filing price
- $10.74
Latest holder snapshot
5 signals
Issuer context
Names, identifiers, and filing context for this profile.
3 identity fields
13F Shares, Excluding Options vs Price
13F Value, Excluding Options
Total Investors
Key facts
- PHAT - Phathom Pharmaceuticals, Inc. - Common Stock, par value $0.0001 per share is tracked under CUSIP 71722W107.
- 173 institutions reported positions in Q1 2026.
- 5 significant owners is listed from Schedule 13D/13G reporting.
Change
- Holder count moved from 173 to 173 between Q4 2025 and Q1 2026.
- SEC-reported value moved from $1,025,500,826 to $765,464,373.
Research use
- You can quickly see who holds this security, then open quarter and manager detail pages for full evidence.
- 13F and Schedule 13D/13G sections are kept together so you can cross-check institutional and beneficial ownership context.
Evidence
Source: SEC Form 13F
Open SEC evidence
Latest holder context comes from 173 institutions filings for Q1 2026.
Security key
71722W107
Latest holder period
Q1 2026
13F holders
173
13D/G owners
5
CIK / CUSIP context first
Open Q1 2026 holders
PHAT full holder history
Phathom Pharmaceuticals, Inc. SEC filings
Phathom Pharmaceuticals, Inc. company facts
Phathom Pharmaceuticals, Inc. insider transactions
Broader feeds
Recent Quarterly Holder Reports
Open recent reporting periods for CUSIP 71722W107:
13D/G owners
Significant owners
Large-stake holder rows connected to Schedule 13D/G evidence.
Rows
5
Security
PHAT
| Filer | Ownership | Change % | Holdings Value | Net Change | Nb Shares | Change % | Reporting Name | Report Period |
|---|---|---|---|---|---|---|---|---|
| Frazier Life Sciences Public Fund, L.P. | 8.6% | 0% | $70,447,299 | 5,985,327 | 0% | James N. Topper | 01 Nov 2025 | |
| MILLENNIUM MANAGEMENT LLC | 5.3% | +87% | $51,101,967 | +$25,636,905 | 4,178,411 | +101% | Millennium Management LLC | 06 Mar 2026 |
| Carlyle Group Inc. | 4.9% | $30,142,485 | 3,496,808 | Carlyle Group Inc. | 28 Aug 2025 | |||
| BlackRock, Inc. | 4.6% | $14,066,607 | 3,226,286 | BlackRock, Inc. | 31 Mar 2025 | |||
| PRUDENTIAL FINANCIAL INC | 0% | -100% | $8,705 | -$24,547,397 | 2,630 | -100% | PRUDENTIAL FINANCIAL INC | 31 May 2025 |
As of 31 Mar 2026, 173 institutional investors reported holding 68,888,502 shares of Phathom Pharmaceuticals, Inc. - Common Stock, par value $0.0001 per share (PHAT). This represents 87% of the company’s total 78,837,943 outstanding shares.
13F concentration
Top 25 institutional shareholders
Largest 13F positions for this security by reported shares and value.
Top holder share
75%
| Institution | Ownership % | Shares Held | Share Change % | Portfolio % | Holdings Value |
|---|---|---|---|---|---|
| Frazier Life Sciences Management, L.P. | 16% | 12,466,489 | 0% | 3.6% | $138,502,693 |
| Medicxi Ventures Management (Jersey) Ltd | 9.5% | 7,464,572 | 0% | 8.4% | $82,931,395 |
| Invesco Ltd. | 5.5% | 4,322,060 | +10% | 0.01% | $48,018,086 |
| BlackRock, Inc. | 5.2% | 4,061,996 | +14% | 0% | $45,128,776 |
| MILLENNIUM MANAGEMENT LLC | 5.1% | 4,022,909 | +93% | 0.03% | $44,694,519 |
| Carlyle Group Inc. | 4.4% | 3,496,808 | 0% | 0.37% | $38,849,537 |
| VANGUARD CAPITAL MANAGEMENT LLC | 3.3% | 2,583,636 | 0% | 0% | $28,704,196 |
| NEA Management Company, LLC | 2.5% | 1,960,169 | 0% | 1.2% | $21,777,478 |
| 683 Capital Management, LLC | 2.3% | 1,850,000 | +3.6% | 1.9% | $20,553,500 |
| Ensign Peak Advisors, Inc | 2.1% | 1,627,806 | -31% | 0.03% | $18,084,925 |
| Catalys Pacific, LLC | 1.9% | 1,493,854 | +4.5% | 7.2% | $16,596,718 |
| GW&K Investment Management, LLC | 1.8% | 1,421,109 | +8.8% | 0.14% | $15,789,000 |
| STATE STREET CORP | 1.8% | 1,386,890 | +21% | 0% | $15,408,348 |
| WASATCH ADVISORS LP | 1.7% | 1,340,916 | +0.69% | 0.1% | $14,897,577 |
| GEODE CAPITAL MANAGEMENT, LLC | 1.7% | 1,328,045 | +24% | 0% | $14,756,816 |
| NOMURA ASSET MANAGEMENT INTERNATIONAL INC. | 1.5% | 1,205,369 | 0.02% | $13,392,000 | |
| SummitTX Capital, L.P. | 1.3% | 995,885 | +92% | 0.35% | $11,064,282 |
| FRANKLIN RESOURCES INC | 1.3% | 994,504 | 0% | $11,048,939 | |
| PERCEPTIVE ADVISORS LLC | 1.2% | 925,000 | 0.2% | $10,276,750 | |
| MARSHALL WACE, LLP | 1.1% | 860,692 | 0.01% | $9,562,288 | |
| Propel Bio Management, LLC | 1.1% | 841,272 | +14% | 5.9% | $9,354,403 |
| VANGUARD PORTFOLIO MANAGEMENT LLC | 0.84% | 666,029 | 0% | 0% | $7,399,582 |
| GOLDMAN SACHS GROUP INC | 0.79% | 626,196 | +60% | 0% | $6,957,038 |
| EcoR1 Capital, LLC | 0.79% | 625,000 | 0.3% | $6,943,750 | |
| TWO SIGMA INVESTMENTS, LP | 0.61% | 482,136 | +734% | 0% | $5,356,531 |
Quarter history
Institutional holders across reporting periods
Holder count, reported shares/value, and median price by quarter.
Periods
26
Latest
Q1 2026
Rows shown
1-25 of 26
| Period | 13F Shares, Excl. Options | Value, Excl. Options | Value Change | Price (Median) | Investors |
|---|---|---|---|---|---|
| 2026 Q1 | 68,888,502 | $765,464,373 | +$57,584,262 | $11.11 | 173 |
| 2025 Q4 | 61,960,214 | $1,025,500,826 | -$3,898,620 | $16.59 | 173 |
| 2025 Q3 | 62,330,243 | $733,626,032 | +$59,060,064 | $11.77 | 132 |
| 2025 Q2 | 57,415,787 | $550,618,405 | -$26,654,537 | $9.59 | 117 |
| 2025 Q1 | 64,025,009 | $401,391,744 | -$24,944,522 | $6.27 | 136 |
| 2024 Q4 | 66,610,653 | $540,837,976 | -$121,495,122 | $8.12 | 141 |
| 2024 Q3 | 72,636,064 | $1,312,668,227 | +$264,199,549 | $18.08 | 133 |
| 2024 Q2 | 58,109,780 | $598,557,394 | +$27,856,700 | $10.30 | 113 |
| 2024 Q1 | 55,378,949 | $588,085,973 | +$14,631,856 | $10.62 | 112 |
| 2023 Q4 | 54,112,686 | $503,299,407 | +$11,390,968 | $9.13 | 115 |
| 2023 Q3 | 43,760,270 | $452,721,621 | +$5,267,236 | $10.37 | 109 |
| 2023 Q2 | 42,778,866 | $612,591,768 | +$176,400,941 | $14.32 | 103 |
| 2023 Q1 | 30,786,694 | $219,689,484 | +$28,315,357 | $7.14 | 83 |
| 2022 Q4 | 28,212,747 | $316,546,824 | -$21,719,929 | $11.22 | 83 |
| 2022 Q3 | 30,185,827 | $334,342,526 | +$38,042,890 | $11.08 | 87 |
| 2022 Q2 | 27,258,631 | $230,064,222 | +$9,335,400 | $8.44 | 88 |
| 2022 Q1 | 25,654,888 | $349,117,442 | -$176,036,740 | $13.61 | 74 |
| 2021 Q4 | 28,574,214 | $561,954,045 | +$49,942,191 | $19.67 | 82 |
| 2021 Q3 | 25,543,470 | $819,833,454 | +$19,152,056 | $32.10 | 81 |
| 2021 Q2 | 24,918,954 | $843,508,479 | +$13,169,188 | $33.85 | 76 |
| 2021 Q1 | 24,475,818 | $919,193,673 | +$1,760,408 | $37.56 | 82 |
| 2020 Q4 | 24,534,138 | $815,024,391 | +$96,707,884 | $33.22 | 75 |
| 2020 Q3 | 21,632,831 | $793,536,439 | -$7,640,662 | $36.67 | 57 |
| 2020 Q2 | 21,847,152 | $718,752,879 | -$3,025,534 | $32.91 | 59 |
| 2020 Q1 | 21,949,381 | $565,607,078 | +$3,219,839 | $25.82 | 47 |