Spero Therapeutics (SPRO)

NASDAQ:SPRO

US Market

SPRO

Spero Therapeutics

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Spero Therapeutics (SPRO) Ownership - Who Owns Spero Therapeutics?

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Spero Therapeutics (SPRO) Ownership Overview

4.05% Mutual Funds

23.33% Other Institutional Investors

3.31% ETFs

65.07% Public Companies and

Individual Investors

The ownership structure of Spero Therapeutics (SPRO) stock is a mix of institutional, retail, and individual investors. Approximately 30.69% of the company’s stock is owned by Institutional Investors, 4.24% is owned by Insiders, and 65.07% is owned by Public Companies and Individual Investors.

The ownership structure of Spero Therapeutics (SPRO) stock is a mix of institutional, retail, and individual investors. Approximately 27.38% of the company’s stock is owned by Institutional Investors, 4.24% is owned by Insiders, and 3.31% is owned by Public Companies and Individual Investors.

Recent Insider Trading Activity

Date	Name	Activity	Value
May 06, 2026	Esther Rajavelu	xxxxxxxxxxxxx	$63352
Feb 09, 2026	Esther Rajavelu	xxxxxxxxxxxxx	$207484
Feb 09, 2026	Timothy Keutzer	xxxxxxxxxxxxx	$44019
Feb 05, 2026	Timothy Keutzer	xxxxxxxxxxxxx	$101175

Show More Insider Trading Activity >

Top Shareholders

Holder	# of Shares	Type	% Holding	Value
	1,752,884	Institution	3.03%	4,995,719
	1,752,884	Institution	3.03%	4,995,719
	1,012,091	Insider	1.75%	2,884,459
	742,506	Insider	1.28%	2,116,142
	703,294	Insider	1.21%	2,004,388
Bruce Winson	421,956	Institution	0.73%	1,202,575
	395,947	Institution	0.68%	1,128,449
	114,800	Institution	0.20%	327,180
	74,457	Institution	0.13%	212,202
	50,186	Institution	0.09%	143,030

Top Mutual Fund Holders

Holder	# of Shares	Type	% Holding	Value
	1,752,884	Institution	3.03%	4,995,719
	395,947	Institution	0.68%	1,128,449
	114,800	Institution	0.20%	327,180
	28,565	Institution	0.05%	81,410
	24,176	Institution	0.04%	68,902
	22,820	Institution	0.04%	65,037
	8,192	Institution	0.01%	23,347

Top ETF Holders

Holder	# of Shares	Type	% Holding	Value
Vanguard Total Stock Market ETF	1,236,776	Institution	2.14%	3,104,308
Vanguard Extended Market ETF	516,108	Institution	0.89%	1,295,431
Invesco NASDAQ Future Gen 200 ETF	38,460	Institution	0.07%	103,842
Dimensional U.S. Small Cap ETF	37,090	Institution	0.06%	100,143
Avantis U.S Small Cap Equity ETF	36,811	Institution	0.06%	104,911
Dimensional U.S. Targeted Value ETF	24,514	Institution	0.04%	66,188
Invesco FTSE RAFI US 1500 Small-Mid ETF	11,726	Institution	0.02%	31,660
Dimensional US Core Equity 1 ETF	7,979	Institution	0.01%	22,740
Dimensional U.S. Core Equity 2 ETF	4,874	Institution	<0.01%	13,160

FAQ

Who Owns Spero Therapeutics (SPRO)?

According to the latest TipRanks data, approximately 23.33% of the company's stock is held by institutional investors, 4.24% is held by insiders, and 65.07% is held by retail investors.

What percentage of Spero Therapeutics (SPRO) stock is held by institutional investors?

According to the latest TipRanks data, approximately 23.33% of Spero Therapeutics (SPRO) stock is held by institutional investors.

What percentage of Spero Therapeutics (SPRO) stock is held by retail investors?

According to the latest TipRanks data, approximately 65.07% of Spero Therapeutics (SPRO) stock is held by retail investors.

Who owns the most shares of Spero Therapeutics (SPRO)?

VANGUARD INDEX FUNDS owns the most shares of Spero Therapeutics (SPRO).

What is the significance of the ownership structure for a publicly traded company?

The ownership structure can impact the company's decision making, as large institutional investors may exert influence on the company's management and can also affect the company's stock price with their buying and selling patterns.