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PHAT · Phathom Pharmaceuticals, Inc. · Holdings

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$8.36 -0.01 (-0.12%) At close · Sep 11
Market Cap
$676.33M
Shares
80.90M

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: 163
Total Value: $793,338,135
Total Shares: 73,119,730
Showing 1–100 of 171 holdings by value · page 1 of 2

Institutional Ownership Trend

26 quarters

Holder Concentration

Across 163 13F filers · Δ vs Mar 31, 2026
Top Holder
17.0%
Sep 2023 → Jun 2026 · range 13.9% – 23.0%
−0.8 pts
Top 5
43.7%
Sep 2023 → Jun 2026 · range 42.7% – 52.9%
−2.6 pts
Top 10
60.3%
Sep 2023 → Jun 2026 · range 60.3% – 71.3%
−2.5 pts
HHI
592
Sep 2023 → Jun 2026 · range 537 – 860
Broadly held−46

Quarterly Activity

vs Mar 31, 2026
New
21
Increased
62
Decreased
50
Sold Out
34
Unchanged
30
Holder count: -13
Institutional value: +2.3%
Shares held: +4.5%

Top Buyers

vs Mar 31, 2026
Institution Added Now Holds Open

Top Sellers

vs Mar 31, 2026
Institution Sold Now Holds Open

Top New Positions

vs Mar 31, 2026
Institution Acquired Value (USD) Open

Top Sold-Out Positions

vs Mar 31, 2026
Institution Previously Held Last Value (USD) Open
Showing 100 of 171
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Holder Value (USD) % of 13F Shares Open
Key facts CIK 1783183 CUSIP 71722W107 13F (30d) 64 filings 64 filers Visit website Investor relations