Seres Therapeutics Ownership | Who Owns Seres Therapeutics?

Overview Forecast RevenueFinancials Chart Transcripts

Seres Therapeutics Ownership Summary

Seres Therapeutics is owned by 23.90% institutional investors, 11.49% insiders, and 64.61% 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	23.90%	11.49%	64.61%
Sector	Healthcare Stocks	244.37%	12.11%	-156.48%
Industry	Biotech Stocks	379.01%	11.75%	-290.76%

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
Tower research capital llc (trc)	794.00	0.00%	$7.04K
Vanguard group	324.21K	0.00%	$4.82M
Susquehanna group, llp	105.34K	0.00%	$934.36K

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
Allworth financial lp	-4.00
Srs capital advisors	-6.00
Sound income strategies	-8.00

Institutional Ownership Trends

Date	Holdings	Change %	Shares	Change %	Ownership	Change %	Increased Position	Change %	Decreased Position	Change %
Jun 30, 2026	40	11.11%	2,305,453	-0.04%	23	4.13%	16	-	12	50.00%
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%

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 MStar Total Stk Mkt Idx Invest	206.17K	2.16%	-
Vanguard Total Stock Mkt Idx Inv	206.17K	2.13%	-
Vanguard Morn Total Stk Mkt Idx Investor	206.17K	2.13%	-
Fidelity Growth Compy Commingled Pl S	108.78K	1.25%	-73.89K
Vanguard Institutional Extnd Mkt Idx Tr	75.85K	0.79%	-
Vanguard Explorer Inv	1.22M	0.72%	-
Fidelity Select Biotechnology	854.35K	0.50%	-
Fidelity Series Growth Company	38.18K	0.44%	-22.70K

Recent Insider Transactions

Date	Name	Role	Activity	Value
Aug 17, 2026	Brady Kelly	See Remarks	Sell	$291.20
Aug 17, 2026	Shaff Eric D.	-	Sell	$1.20K
Aug 17, 2026	Henn Matthew R	See Remarks	Sell	$368.55
Aug 17, 2026	DesRosier Thomas	See Remarks	Sell	$373.10
May 18, 2026	Shaff Eric D.	-	Sell	$1.95K

Insider Transactions Trends

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

MCRB Ownership FAQ

Who Owns Seres Therapeutics?

Seres Therapeutics shareholders are primarily institutional investors at 23.90%, followed by 11.49% insiders and 64.61% retail investors. The average institutional ownership in Seres Therapeutics's industry, Biotech Stocks , is 379.01%, 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.

Try Tickergate Pro Free

Customize Everything. 100% Flexibility. Fast and Easy to Use (No code or Excel Needed)

Customize your own personal stocks lists, views and charts
Choose from hundreds of fields, up to 15 years of history
Conduct deep comparison analysis

Discover trending investment themes
Find your next best investment
Research stocks using tools