Seres Therapeutics Ownership | Who Owns Seres Therapeutics?

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Seres Therapeutics Ownership Summary

Seres Therapeutics is owned by 5.08% institutional investors, 11.77% insiders, and 83.15% retail investors. Flagship pioneering is the largest institutional shareholder, holding 12.06% of MCRB shares. Fidelity Growth Compy Commingled Pl O is the top mutual fund, with 5.55% of its assets in Seres Therapeutics shares.

MCRB Ownership Benchmark

Type	Name	% Inst	% Insiders	% Retail
Stock	Seres Therapeutics	5.08%	11.77%	83.15%
Sector	Healthcare Stocks	35.58%	11.87%	52.55%
Industry	Biotech Stocks	35.75%	11.83%	52.41%

Institutional Shareholders

Top Institutional Shareholders by Total Shares

Holder	Shares	% Holding	Value
Flagship pioneering	1.16M	12.06%	$10.25M
Vanguard group	324.21K	3.70%	$4.82M
Marshall wace, llp	139.54K	1.46%	$1.24M
Vontobel	138.47K	1.45%	$1.23M
Blackrock	1.76M	1.21%	$1.28M
Susquehanna group, llp	105.34K	1.10%	$934.36K
Blackrock funding, inc. /de	102.03K	1.06%	$904.97K
Geode capital management	74.83K	0.78%	$664.11K
American century companies	62.32K	0.65%	$552.74K
Vanguard fiduciary trust	39.64K	0.41%	$351.63K

Top Institutional Shareholders by % of Total Assets

Holder	Shares	% Assets	Value
Lion point capital, lp	31.57K	1.67%	$280.03K
Flagship pioneering	1.16M	0.88%	$10.25M
J. goldman & co lp	27.00K	0.01%	$519.48K
Vontobel	138.47K	0.00%	$1.23M
Marshall wace, llp	139.54K	0.00%	$1.24M
Sbi securities	3.48K	0.00%	$30.89K
American century companies	62.32K	0.00%	$552.74K
Physician wealth advisors	142.00	0.00%	$1.26K
Tower research capital llc (trc)	794.00	0.00%	$7.04K
Two sigma investments, lp	18.79K	0.00%	$166.70K

Top Buyers

Holder	Shares	% Assets	Change
American century companies	62.32K	0.00%	46.05K
Vanguard fiduciary trust	39.64K	0.00%	39.64K
Vontobel	138.47K	0.00%	35.23K
J. goldman & co lp	27.00K	0.01%	27.00K
Marshall wace, llp	139.54K	0.00%	19.36K

Top Sellers

Holder	Shares	% Assets	Change
Blackrock	1.76M	-	-5.06M
Woodline partners lp	-	-	-2.05M
Millennium management	29.55K	-	-1.78M
Bank of america corp /de/	105.04K	-	-1.55M
Handelsbanken fonder ab	-	-	-1.10M

New Positions

Holder	Shares	% Assets	Change	Value
Vanguard fiduciary trust	39.64K	0.00%	39.64K	$351.63K
J. goldman & co lp	27.00K	0.01%	27.00K	$519.48K
Macquarie group	4.95K	-	4.95K	$3.58K
Vanguard global advisers	1.98K	-	1.98K	$17.52K
Group one trading	824.00	-	824.00	$7.31K

Sold Out

Holder	Change
Whittier trust	-1.00
Federation des caisses desjardins du quebec	-3.00
Headlands	-10.00
Us bancorp \de\	-12.00
Point72 (difc)	-17.00

Institutional Ownership Trends

Date	Holdings	Change %	Shares	Change %	Ownership	Change %	Increased Position	Change %	Decreased Position	Change %
Mar 31, 2026	11	-72.50%	486,589	-80.07%	5	0.65%	5	-77.27%	2	-75.00%
Dec 31, 2025	7	-84.09%	333,553	-84.31%	3	0.64%	3	-88.46%	1	-85.71%
Sep 30, 2025	10	-71.43%	448,121	-80.32%	5	0.76%	5	-54.55%	1	-95.45%
Jun 30, 2025	36	-44.62%	2,284,946	-96.28%	26	2.10%	13	-35.00%	21	16.67%
Mar 31, 2025	3	-96.00%	23,487,356	-62.76%	13	0.79%	-	-100.00%	1	-94.44%

Top Mutual Funds Shareholders

Holder	Shares	% Holding	Change
Fidelity Growth Compy Commingled Pl O	9.44M	5.55%	92.60K
Vanguard US Total Market Shares ETF	4.04M	2.32%	-
Vanguard Total Stock Mkt Idx Inv	206.17K	2.14%	-
Fidelity Growth Compy Commingled Pl S	108.78K	1.25%	-73.89K
Vanguard Institutional Extnd Mkt Idx Tr	76.12K	0.79%	6.17K
Vanguard Explorer Inv	1.22M	0.72%	-
Avantis US Small Cap Value ETF	49.64K	0.52%	-
Fidelity Select Biotechnology	854.35K	0.50%	-
Fidelity Series Growth Company	38.18K	0.44%	-22.70K
LUX IM Global Medtech HX	38.13K	0.40%	-

Recent Insider Transactions

Date	Name	Role	Activity	Value
May 18, 2026	Shaff Eric D.	-	Sell	$1.95K
May 18, 2026	DesRosier Thomas	See Remarks	Sell	$594.87
May 18, 2026	Brady Kelly	See Remarks	Sell	$444.27
May 18, 2026	Henn Matthew R	See Remarks	Sell	$579.81
Feb 15, 2026	Shaff Eric D.	-	Sell	$2.19K

Insider Transactions Trends

Date	Buy	Sell
2026 Q2	-	4
2026 Q1	-	4
2025 Q4	-	4
2025 Q3	-	4
2025 Q2	-	4

MCRB Ownership FAQ

Who Owns Seres Therapeutics?

Seres Therapeutics shareholders are primarily institutional investors at 5.08%, followed by 11.77% insiders and 83.15% retail investors. The average institutional ownership in Seres Therapeutics's industry, Biotech Stocks , is 35.75%, which Seres Therapeutics falls below.

Who owns the most shares of Seres Therapeutics?

Seres Therapeutics’s largest shareholders are Flagship pioneering (1.16M shares, 12.06%), Vanguard group (324.21K shares, 3.70%), and Marshall wace, llp (139.54K shares, 1.46%). Together, they hold 17.22% of Seres Therapeutics’s total shares outstanding.

Does Blackrock own Seres Therapeutics?

Yes, BlackRock owns 1.21% of Seres Therapeutics, totaling 1.76M shares as of Jun 2024. This represents 0% of BlackRock's total assets, with a market value of 1.28M$. In the last quarter, BlackRock decreased its holdings by -5.063M shares, a -74.18% change.

Who is Seres Therapeutics’s biggest shareholder by percentage of total assets invested?

Lion point capital, lp is Seres Therapeutics’s biggest shareholder by percentage of total assets invested, with 1.67% of its assets in 31.57K Seres Therapeutics shares, valued at 280.03K$.

Who is the top mutual fund holder of Seres Therapeutics shares?

Fidelity Growth Compy Commingled Pl O is the top mutual fund holder of Seres Therapeutics shares, with 5.55% of its total shares outstanding invested in 9.44M Seres Therapeutics shares.

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