Sutro Biopharma, Inc. (STRO) Institutional Ownership

Institutions by Trading Activity

Ownership Statistics

8,305,249Shares Outstanding

17,550Shares held by institutions

$292,032Value of institutional holdings

67.30%Institutional ownership %

1,827.38%Shares Changed QoQ

59No. of institutional investors

Shares Owned by Institutions

Shares Purchased/Sold by Institutions

Ownership Summary

The institutional landscape for Sutro Biopharma, Inc. (NASDAQ:STRO) includes 59 filers as of the latest reporting cycle ending December 2025.

The collective stake of institutional investors in Sutro Biopharma moved to 67.3% in December 2025, a shift up from the 64.3% reported for September 2025.
Institutional share ownership changed by 1827.38% QoQ, while the number of institutional owners saw a decrease of 52.03% YoY.
Of these 59 institutional investors, 56 increased their holdings in Sutro Biopharma, while 1 of them reduced positions, and 2 investors maintained their exposure.
The aggregate institutional position in Sutro Biopharma now stands at 5.59Mn shares as of December 2025, after investors increased their holdings (up by 5.30Mn shares quarter on quarter which is down 799.35K shares year over year).
As of December 31, 2025, Affinity Asset Advisors, LLC held Sutro Biopharma's largest shareholding position with over 748.38K shares, representing 9.01% of total outstanding shares.
Among the most significant buyers of Sutro Biopharma during December 2025 were Affinity Asset Advisors, LLC (748.38K), Kynam Capital Management, LP (479.59K), MILLENNIUM MANAGEMENT LLC (418.20K), VANGUARD GROUP INC (375.79K), ACADIAN ASSET MANAGEMENT LLC (337.95K).
Leading sellers of Sutro Biopharma stock in December 2025 included EverSource Wealth Advisors, LLC (14).
The top 10 institutional holders of Sutro Biopharma for the quarter ending December 2025 included Affinity Asset Advisors, LLC (748.38K), Kynam Capital Management, LP (479.59K), MILLENNIUM MANAGEMENT LLC (418.20K), VANGUARD GROUP INC (375.79K), ACADIAN ASSET MANAGEMENT LLC (337.95K), Velan Capital Investment Management LP (312.00K), Merck & Co., Inc. (272.35K), Vestal Point Capital, LP (243.00K), BALYASNY ASSET MANAGEMENT L.P. (230.05K), Samsara BioCapital, LLC (204.50K).

59 Institutional Holders

17,550 Total Shares Held

Rows:

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Owner Name	Date	Shares Held	Change (QoQ)	Change (%)	Value (USD)
Affinity Asset Advisors, LLC	31 Dec, 2025	748,382	748,382	0.00%	$8,658,780.00
Kynam Capital Management, LP	31 Dec, 2025	479,590	479,590	0.00%	$5,548,856.00
MILLENNIUM MANAGEMENT LLC	31 Dec, 2025	418,196	418,196	0.00%	$4,838,528.00
VANGUARD GROUP INC	31 Dec, 2025	375,786	375,786	0.00%	$4,347,844.00
ACADIAN ASSET MANAGEMENT LLC	31 Dec, 2025	337,953	337,953	0.00%	$3,908.00
Velan Capital Investment Management LP	31 Dec, 2025	312,000	312,000	0.00%	$3,609,840.00
Merck & Co., Inc.	31 Dec, 2025	272,351	0	0.00%	$3,151,101.00
Vestal Point Capital, LP	31 Dec, 2025	243,000	243,000	0.00%	$2,811,510.00
BALYASNY ASSET MANAGEMENT L.P.	31 Dec, 2025	230,049	230,049	0.00%	$2,661,667.00
Samsara BioCapital, LLC	31 Dec, 2025	204,503	204,503	0.00%	$2,366,100.00
ADAGE CAPITAL PARTNERS GP, L.L.C.	31 Dec, 2025	200,000	200,000	0.00%	$2,314,000.00
Eversept Partners, LP	31 Dec, 2025	193,571	193,571	0.00%	$2,239,616.00
Opaleye Management Inc.	31 Dec, 2025	190,671	190,671	0.00%	$2,206,063.00
Point72 Asset Management, L.P.	31 Dec, 2025	179,088	179,088	0.00%	$2,072,048.00
TANG CAPITAL MANAGEMENT LLC	31 Dec, 2025	139,617	139,617	0.00%	$1,615,369.00
RENAISSANCE TECHNOLOGIES LLC	31 Dec, 2025	122,865	122,865	0.00%	$1,421,548.00
BlackRock, Inc.	31 Dec, 2025	117,437	117,437	0.00%	$1,358,746.00
GSA CAPITAL PARTNERS LLP	31 Dec, 2025	89,067	89,067	0.00%	$1,031.00
MARSHALL WACE, LLP	31 Dec, 2025	85,615	85,615	0.00%	$990,565.00
GEODE CAPITAL MANAGEMENT, LLC	31 Dec, 2025	83,979	83,979	0.00%	$971,990.00

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