Save your place

Sign in to WhoBought

Please try again later.

Jim Simons's Phathom Pharmaceuticals, Inc. (PHAT) position

Yes: as of Q1 2026, Jim Simons holds 306K shares of PHAT worth an amount we cannot price (0.0% of the disclosed portfolio). Held since at least Q1 2021; that opening coverage snapshot is not counted as a purchase.
View full portfolio →
Current value
an amount we cannot price
Shares held
306K
% of portfolio
0.0%
Quarter-end price
No quarter-end price available

Average buy price is hidden here because at least one covered purchase quarter has no usable local mean price.

PHAT price vs Simons's position

Dates
$8$10$12← Earlier —4 purchases
Average closing price · filing quarter
Price range · filing quarter

Every quarterly change

Quarter Action Shares change Est. value change Δ Own Shares held Filing date
Q1 2026 New +306K 306K May 14, 2026
Q4 2023 New +66K 66K Feb 13, 2024
Q2 2023 New +10K 10K Aug 11, 2023
Q2 2022 New +24K 24K Aug 12, 2022
Q1 2021 First covered 11K May 13, 2021
Data through Q1 2026 · filed May 14, 2026
5 grouped rows from 5 quarters

More Simons positions

Common questions

Does Jim Simons own PHAT?

Yes. As of Q1 2026, Jim Simons disclosed 306K shares of PHAT, worth an amount we cannot price. All figures come from SEC 13F filings for Q1 2026, the latest disclosed quarter.

When did Jim Simons buy PHAT?

Jim Simons held PHAT since at least Q1 2021, when this filing coverage begins; the opening snapshot is not a disclosed purchase. All figures come from SEC 13F filings for Q1 2026, the latest disclosed quarter.

Did Jim Simons sell PHAT?

The quarter-by-quarter table above shows each sale and reduction Jim Simons disclosed in PHAT. All figures come from SEC 13F filings for Q1 2026, the latest disclosed quarter.

How many shares of PHAT does Jim Simons own?

Jim Simons disclosed 306K shares of PHAT as of Q1 2026. All figures come from SEC 13F filings for Q1 2026, the latest disclosed quarter.

What price did Jim Simons pay for PHAT?

Jim Simons began building the PHAT position before our 13F history starts, so an exact average buy price cannot be estimated without understating it. All figures come from SEC 13F filings for Q1 2026, the latest disclosed quarter.

How are the estimated trade prices calculated?

13F filings disclose quarter-end holdings, not trade dates or execution prices. These estimates use each covered quarter's average market price; the add average excludes the opening position and quarters without price data. All figures come from SEC 13F filings for Q1 2026, the latest disclosed quarter.