Seres Therapeutics Ownership | Who Owns Seres Therapeutics?

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Seres Therapeutics Ownership Summary

Seres Therapeutics is owned by 5.13% institutional investors, 12.50% insiders, and 82.37% retail investors. Flagship pioneering is the largest institutional shareholder, holding 13.22% 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	5.13%	12.50%	82.37%
Sector	Healthcare Stocks	42.52%	10.81%	46.67%
Industry	Biotech Stocks	45.24%	10.75%	44.01%

Institutional Shareholders

Top Institutional Shareholders by Total Shares

Holder	Shares	% Holding	Value
Flagship pioneering	1.16M	13.22%	$22.24M
Vanguard group	311.89K	3.57%	$6.00M
Marshall wace, llp	125.60K	1.44%	$2.42M
Blackrock	1.76M	1.21%	$1.28M
Blackrock funding, inc. /de	102.06K	1.17%	$1.96M
Vontobel	98.51K	1.13%	$1.90M
Geode capital management	84.98K	0.97%	$1.64M
Charles schwab investment management	31.40K	0.36%	$604.19K
State street	29.73K	0.34%	$572.02K
Schonfeld strategic advisors	28.94K	0.33%	$556.84K

Top Institutional Shareholders by % of Total Assets

Holder	Shares	% Assets	Value
Flagship pioneering	1.16M	7.60%	$22.24M
Lion point capital, lp	27.14K	2.97%	$522.13K
J. goldman & co lp	27.00K	0.01%	$519.48K
Vontobel	98.51K	0.01%	$1.90M
Schonfeld strategic advisors	28.94K	0.00%	$556.84K
Marshall wace, llp	125.60K	0.00%	$2.42M
Sbi securities	3.48K	0.00%	$66.99K
Physician wealth advisors	142.00	0.00%	$2.73K
Charles schwab investment management	31.40K	0.00%	$604.19K
Geode capital management	84.98K	0.00%	$1.64M

Top Buyers

Holder	Shares	% Assets	Change
Goldman sachs group	52.95K	-	38.28K
Marshall wace, llp	125.60K	0.00%	34.20K
Schonfeld strategic advisors	28.94K	0.00%	28.94K
J. goldman & co lp	27.00K	0.01%	27.00K
Vanguard group	311.89K	0.00%	19.79K

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
Schonfeld strategic advisors	28.94K	0.00%	28.94K	$556.84K
J. goldman & co lp	27.00K	0.01%	27.00K	$519.48K
Invesco	10.44K	-	10.44K	$200.90K
Macquarie group	4.95K	-	4.95K	$3.58K
Simplex trading	2.81K	-	2.81K	$54.00K

Sold Out

Holder	Change
Whittier trust	-1.00
Headlands	-10.00
Point72 (difc)	-17.00
Nelson, van denburg & campbell wealth management group	-20.00
Jones financial companies lllp	-49.00

Institutional Ownership Trends

Date	Holdings	Change %	Shares	Change %	Ownership	Change %	Increased Position	Change %	Decreased Position	Change %
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%
Dec 31, 2024	70	-13.58%	62,481,139	-1.44%	40	2.37%	25	-3.85%	17	-34.62%
Sep 30, 2024	81	-14.74%	63,396,268	-8.26%	41	1.86%	27	-41.30%	26	-3.70%

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	188.70K	2.16%	-4.12K
Fidelity Growth Compy Commingled Pl S	108.78K	1.25%	-73.89K
Vanguard Institutional Extnd Mkt Idx Tr	77.12K	0.88%	-13.61K
Vanguard Explorer Inv	1.22M	0.72%	-
LUX IM Global Medtech HX	48.10K	0.55%	-
Fidelity Select Biotechnology	854.35K	0.50%	-
Fidelity Extended Market Index	38.86K	0.44%	-320.00
Fidelity Series Growth Company	38.18K	0.44%	-22.70K

Recent Insider Transactions

Date	Name	Role	Activity	Value
Nov 15, 2025	Young Teresa L.	See Remarks	Sell	$18.03K
Nov 15, 2025	Shaff Eric D.	-	Sell	$3.75K
Nov 15, 2025	DesRosier Thomas	See Remarks	Sell	$1.31K
Nov 15, 2025	Henn Matthew R	See Remarks	Sell	$21.75K
Aug 18, 2025	Shaff Eric D.	-	Sell	$3.61K

Insider Transactions Trends

Date	Buy	Sell
2025 Q3	-	4
2025 Q2	-	4
2025 Q1	-	5
2024 Q4	-	10
2024 Q3	-	7

MCRB Ownership FAQ

Who Owns Seres Therapeutics?

Seres Therapeutics shareholders are primarily institutional investors at 5.13%, followed by 12.50% insiders and 82.37% retail investors. The average institutional ownership in Seres Therapeutics's industry, Biotech Stocks , is 45.24%, which Seres Therapeutics falls below.

Who owns the most shares of Seres Therapeutics?

Seres Therapeutics’s largest shareholders are Flagship pioneering (1.16M shares, 13.22%), Vanguard group (311.89K shares, 3.57%), and Marshall wace, llp (125.6K shares, 1.44%). Together, they hold 18.22% 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?

Flagship pioneering is Seres Therapeutics’s biggest shareholder by percentage of total assets invested, with 7.60% of its assets in 1.16M Seres Therapeutics shares, valued at 22.24M$.

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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