TickerFacts.

Seres Therapeutics, Inc. (MCRB): Shares Outstanding

Annual figures by period end, from SEC filings.

Stock splits: 1-for-20, first reflected in a filing dated 2025-05-07. Figures are as filed: per-share figures and share counts last reported before a split are on the old share basis, so changes and growth rates across a split are not shown. Splits are read from the filings' own restatements, so a share conversion in a merger or reorganization shows up the same way.

9.56M
As of 2025-12-31
9.83M
As of 2026-06-30
135.04M2014-12-31: 6.89M2015-12-31: 39.08M2016-12-31: 40.36M2017-12-31: 40.57M2018-12-31: 40.94M2019-12-31: 70.14M2020-12-31: 91.46M2021-12-31: 91.89M2022-12-31: 125.22M2023-12-31: 135.04M2024-12-31: 8.65M2025-12-31: 9.56M9.56M
2014-12-31 Shares Outstanding (shares) 2025-12-31

Paler bars were last filed before a stock split, on the old share basis.

Period endedShares OutstandingChange YoYSource filing
2025-12-319.56M+10.5%2026-03-12, Balance as of period end
2024-12-318.65Mn/c2026-03-12, Balance as of period end
2023-12-31135.04M+7.8%2025-03-13, Balance as of period end
2022-12-31125.22M+36.3%2024-03-05, Balance as of period end
2021-12-3191.89M+0.5%2023-03-07, Balance as of period end
2020-12-3191.46M+30.4%2022-03-01, Balance as of period end
2019-12-3170.14M+71.3%2021-03-02, Balance as of period end
2018-12-3140.94M+0.9%2020-03-02, Balance as of period end
2017-12-3140.57M+0.5%2019-03-06, Balance as of period end
2016-12-3140.36M+3.3%2018-03-08, Balance as of period end
2015-12-3139.08M+467.2%2017-03-16, Balance as of period end
2014-12-316.89Mn/a2016-03-14, Balance as of period end