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Ken Griffin's ALT5 Sigma Corporation (ALTS) position

Yes: as of Q1 2026, Ken Griffin holds 1.4M shares of ALTS 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.
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Current value
an amount we cannot price
Shares held
1.4M
% 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.

ALTS price vs Griffin's position

Dates
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 −94K −6.2% 1.4M May 15, 2026
Q4 2025 Added +1.3M +545.1% 1.5M Feb 17, 2026
Q3 2025 Added +165K +239.9% 234K Nov 14, 2025
Q2 2025 New +69K 69K Aug 14, 2025
Q4 2021 New +14K 14K Feb 14, 2022
Q2 2021 Reduced −15K −46.7% 17K Aug 16, 2021
Q1 2021 First covered 32K May 21, 2021
Data through Q1 2026 · filed May 15, 2026
7 grouped rows from 7 quarters

More Griffin positions

Common questions

Does Ken Griffin own ALTS?

Yes. As of Q1 2026, Ken Griffin disclosed 1.4M shares of ALTS, worth an amount we cannot price. All figures come from SEC 13F filings for Q1 2026, the latest disclosed quarter.

When did Ken Griffin buy ALTS?

Ken Griffin held ALTS 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 Ken Griffin sell ALTS?

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

How many shares of ALTS does Ken Griffin own?

Ken Griffin disclosed 1.4M shares of ALTS as of Q1 2026. All figures come from SEC 13F filings for Q1 2026, the latest disclosed quarter.

What price did Ken Griffin pay for ALTS?

Ken Griffin began building the ALTS 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.