Spero Therapeutics Ownership | Who Owns Spero Therapeutics?

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Spero Therapeutics Ownership Summary

Spero Therapeutics is owned by 28.97% institutional investors, 24.47% insiders, and 46.56% retail investors. Anson funds management lp is the largest institutional shareholder, holding 7.09% of SPRO shares. Vanguard Total Stock Mkt Idx Inv is the top mutual fund, with 2.14% of its assets in Spero Therapeutics shares.

SPRO Ownership Benchmark

Type	Name	% Inst	% Insiders	% Retail
Stock	Spero Therapeutics	28.97%	24.47%	46.56%
Sector	Healthcare Stocks	57.39%	9.93%	32.68%
Industry	Biotech Stocks	68.48%	9.65%	21.87%

Institutional Shareholders

Top Institutional Shareholders by Total Shares

Holder	Shares	% Holding	Value
Anson funds management lp	3.84M	7.09%	$3.96M
Pfizer	2.36M	4.36%	$2.43M
Vanguard group	1.76M	3.26%	$1.82M
Renaissance	1.11M	2.04%	$1.14M
Acadian asset management	1.04M	1.92%	$1.07M
Alphabet	889.98K	1.64%	$916.68K
Murchinson	873.91K	1.61%	$900.13K
Adar1 capital management	801.28K	1.48%	$825.32K
Blackrock	483.40K	0.90%	$628.42K
Blackrock funding, inc. /de	485.35K	0.90%	$499.91K

Top Institutional Shareholders by % of Total Assets

Holder	Shares	% Assets	Value
Anson funds management lp	3.84M	0.40%	$3.96M
Murchinson	873.91K	0.39%	$900.13K
Adar1 capital management	801.28K	0.16%	$825.32K
Pfizer	2.36M	0.09%	$2.43M
Awm investment company	333.40K	0.06%	$433.42K
Alphabet	889.98K	0.05%	$916.68K
Atlas venture life science advisors	305.25K	0.04%	$314.41K
Dafna capital management	125.00K	0.03%	$128.75K
Dlk investment management	28.95K	0.01%	$29.82K
Bridgeway capital management	184.80K	0.00%	$190.34K

Top Buyers

Holder	Shares	% Assets	Change
Pfizer	2.36M	0.09%	2.36M
Murchinson	873.91K	0.39%	873.91K
Mackenzie financial	187.56K	0.00%	155.66K
Renaissance	1.11M	0.00%	130.94K
Anson funds management lp	3.84M	0.40%	89.44K

Top Sellers

Holder	Shares	% Assets	Change
Novo	-	-	-468.90K
Atlas venture life science advisors	305.25K	0.04%	-97.63K
Bank of montreal /can/	-	-	-79.50K
Two sigma securities	-	-	-67.73K
Bailard	-	-	-60.90K

New Positions

Holder	Shares	% Assets	Change	Value
Pfizer	2.36M	0.09%	2.36M	$2.43M
Squarepoint ops	55.05K	0.00%	55.05K	$56.70K
Jane street group	52.87K	-	52.87K	$54.45K
Prudential financial	49.20K	0.00%	49.20K	$50.68K
Virtu financial	46.05K	0.00%	46.05K	$47.00K

Sold Out

Holder	Change
Qube research	-1.00
Pfs partners	-50.00
Northwestern mutual wealth management	-50.00
Raleigh capital management	-500.00
Allworth financial lp	-600.00

Institutional Ownership Trends

Date	Holdings	Change %	Shares	Change %	Ownership	Change %	Increased Position	Change %	Decreased Position	Change %
Dec 31, 2024	52	10.64%	15,679,985	27.34%	28	5.60%	26	160.00%	9	-25.00%
Sep 30, 2024	47	-4.08%	12,313,754	-11.17%	22	3.39%	10	-41.18%	12	50.00%
Jun 30, 2024	49	-9.26%	13,861,979	0.87%	25	3.81%	17	-29.17%	8	-33.33%
Mar 31, 2024	54	12.50%	13,742,012	-0.56%	26	3.79%	24	71.43%	12	20.00%
Dec 31, 2023	48	-9.43%	13,819,601	-2.58%	26	3.60%	14	-12.50%	10	-28.57%

Top Mutual Funds Shareholders

Holder	Shares	% Holding	Change
Vanguard Total Stock Mkt Idx Inv	1.17M	2.14%	-
Vanguard US Total Market Shares ETF	1.17M	2.09%	-
Vanguard Institutional Extnd Mkt Idx Tr	587.34K	1.08%	-
Fidelity Extended Market Index	242.14K	0.43%	-1.54K
Bridgeway Ultra-Small Company Market	134.80K	0.25%	-
iShares Micro-Cap ETF	96.43K	0.17%	-
Fidelity Total Market Index	67.89K	0.12%	-
BlackRock Extended Equity Market K	60.57K	0.11%	-26.00
Mackenzie US Small Cap A	60.35K	0.11%	10.21K
Extended Equity Market Fund K	59.93K	0.11%	184.00

Recent Insider Transactions

Date	Name	Role	Activity	Value
Feb 05, 2025	Keutzer Timothy	Chief Operating Officer	Sell	$19.44K
Feb 05, 2025	Keutzer Timothy	Chief Operating Officer	Sell	$3.10K
Feb 05, 2025	Keutzer Timothy	Chief Operating Officer	Sell	$21.56K
Feb 05, 2025	Rajavelu Esther	CFO & CBO	Sell	$16.14K
Feb 05, 2025	Shukla Sath	CEO & President	Sell	$4.79K

Insider Transactions Trends

Date	Buy	Sell
2025 Q1	-	9
2024 Q4	-	2
2024 Q3	-	5
2024 Q2	-	-
2024 Q1	-	6

SPRO Ownership FAQ

Who Owns Spero Therapeutics?

Spero Therapeutics shareholders are primarily institutional investors at 28.97%, followed by 24.47% insiders and 46.56% retail investors. The average institutional ownership in Spero Therapeutics's industry, Biotech Stocks , is 68.48%, which Spero Therapeutics falls below.

Who owns the most shares of Spero Therapeutics?

Spero Therapeutics’s largest shareholders are Anson funds management lp (3.84M shares, 7.09%), Pfizer (2.36M shares, 4.36%), and Vanguard group (1.76M shares, 3.26%). Together, they hold 14.72% of Spero Therapeutics’s total shares outstanding.

Does Blackrock own Spero Therapeutics?

Yes, BlackRock owns 0.90% of Spero Therapeutics, totaling 483.4K shares as of Jun 2024. This represents 0% of BlackRock's total assets, with a market value of 628.42K$. In the last quarter, BlackRock increased its holdings by 6.51K shares, a 1.36% change.

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

Anson funds management lp is Spero Therapeutics’s biggest shareholder by percentage of total assets invested, with 0.40% of its assets in 3.84M Spero Therapeutics shares, valued at 3.96M$.

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

Vanguard Total Stock Mkt Idx Inv is the top mutual fund holder of Spero Therapeutics shares, with 2.14% of its total shares outstanding invested in 1.17M Spero Therapeutics shares.

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