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Jim Simons's Spero Therapeutics, Inc. (SPRO) position

Yes: as of Q1 2026, Jim Simons holds 1.2M shares of SPRO worth an amount we cannot price (0.0% of the disclosed portfolio). Last quarter the position was reduced by 7.1%. First disclosed Q1 2022.
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Current value
an amount we cannot price
Shares held
1.2M
% 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.

SPRO price vs Simons's position

Dates
$1$1.2$1.4$1.6← Earlier —10 purchases, 7 sells
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 Reduced −90K −7.1% 1.2M May 14, 2026
Q4 2025 Reduced −173K −11.9% 1.3M Feb 12, 2026
Q3 2025 Added +621K +74.6% 1.5M Nov 13, 2025
Q2 2025 Reduced −139K −14.3% 832K Aug 13, 2025
Q1 2025 Reduced −135K −12.2% 971K May 14, 2025
Q4 2024 Added +131K +13.4% 1.1M Feb 13, 2025
Q3 2024 Reduced −1K −0.1% 975K Nov 13, 2024
Q2 2024 Added +121K +14.2% 976K Aug 9, 2024
Q1 2024 Added +307K +56.1% 854K May 13, 2024
Q4 2023 Added +300 +0.1% 547K Feb 13, 2024
Q3 2023 Reduced −46K −7.8% 547K Nov 14, 2023
Q2 2023 Added +183K +44.6% 593K Aug 11, 2023
Q1 2023 Added +67K +19.7% 410K May 12, 2023
Q4 2022 Added +128K +59.7% 343K Feb 13, 2023
Q3 2022 Reduced −724K −77.1% 215K Nov 14, 2022
Q2 2022 Added +830K +760.7% 939K Aug 12, 2022
Q1 2022 New +109K 109K May 13, 2022
Data through Q1 2026 · filed May 14, 2026
17 grouped rows from 17 quarters

More Simons positions

Common questions

Does Jim Simons own SPRO?

Yes. As of Q1 2026, Jim Simons disclosed 1.2M shares of SPRO, 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 SPRO?

Jim Simons first disclosed a SPRO position in Q1 2022; every quarterly buy and sell since is in the table above. All figures come from SEC 13F filings for Q1 2026, the latest disclosed quarter.

Did Jim Simons sell SPRO?

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

How many shares of SPRO does Jim Simons own?

Jim Simons disclosed 1.2M shares of SPRO 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 SPRO?

Jim Simons began building the SPRO 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.