How many institutions own SLRN stock?

A company's 13F filings with the Securities and Exchange Commission (SEC) provides investors with comprehensive information about institutional ownership in a listed company, a sign of strength in terms of how many institutions have confidence in that company. The number of institutional investors who currently own SLRN shares is 152, representing 91.98% of the company's common stock.

Who are the major shareholders selling Acelyrin, Inc. stock?

OPALEYE MANAGEMENT INC., in the last quarter, reduced its stake in SLRN by -27.74% restricting it's holding to 1.62 million shares of worth nearly $3.99M. STATE STREET CORP also lessened -1.47% of the SLRN shares from its portfolio, reducing its holding to 1.42 million shares of worth $3.51M. GOLDMAN SACHS GROUP INC also shunned SLRN shares holding by -38.34% last quarter which brought its holding to 351.41 thousand shares worth $867.98K.

Investors who are buying SLRN stock?

As per its latest 13F filing, TOWERVIEW LLC increased its stake in SLRN by 100% in the last quarter. The institutional holder raised its holding to 540 thousand shares having worth more than $1.33M. INVESCO LTD. also added 231.91% more shares of SLRN to its portfolio, raising its holding to 85.52 thousand shares of worth $211.24K. also increased its SLRN shares holding by 100% which brought its holding to 202.24 thousand shares worth $499.53K.

SLRN's major insiders: who are they?

The insider with the most stakes in SLRN is Westlake BioPartners Fund II, L.P. , 10 percent owner at the company. Additionally, SLRN stock is highly held by Chief Executive Officer Lin Shao-Lee and Chief Executive Officer Kim Mina among others.

Did an insider recently sell SLRN stock?

Company executives, directors, and other insiders own 7.15% percent of Acelyrin, Inc.'s stock. Within the last six months, there have been 0 transaction(s) in which SLRN insiders have sold stock, totaling 0 shares. Insiders that have sold shares include KIM MINA, MURUGAN AMAR, and MPOFU SHEPHARD.

Which insider recently purchased SLRN stock?

There have been 0 transaction(s) during the past 6-months in which Acelyrin, Inc. insiders have bought stock, totalling 0 shares

How much of SLRN does insiders own?

Around 0 Acelyrin, Inc. shares are held by insiders, which represents about 7.15% of SLRN stock.

Who is the insider with the largest stake?

SLRN 10 percent owner, Westlake BioPartners Fund II, L.P. holds the largest portfolio of the company's shares. SLRN shares owned by Westlake total nearly 9.79 million.

Which institution holds the most shares in SLRN?

OPALEYE MANAGEMENT INC. is the largest institutional owner in SLRN which holds 1.62 million shares worth $3.99M or 1.63% of the total SLRN shares outstanding followed by STATE STREET CORP with ownership of 1.42 million shares representing 1.41% of the SLRN ownership. TOWERVIEW LLC is the third largest stakeholder with 540 thousand shares or 0.54% of the ownership worth more than $1.33M.

Is Acelyrin, Inc. stock optionable?

Stock options give the owner the ability but not the obligation to buy or sell a security at a predetermined price and date. Stock options can be classified into two types: puts and calls. A put is a bet on falling stock, and a call is a bet on rising stock. As far as the SLRN is concerned, it is a stock which is not optionable.

Is there a short position on SLRN's shares?

Number of SLRN shares short is 3.57M. Shares short is a market sentiment in which investors have sold their shares short in a given stock but have not yet covered them or closed them out.

About how many outstanding SLRN shares are there?

As of today, 100.95M shares of SLRN are outstanding.

Is there many float in SLRN stock?

Float represents the number of tradeable shares in a specific stock. By subtracting restricted and closely-held shares from a firm's total outstanding shares, we can calculate its floating stock. The term "closely-held shares" refers to shares held by employees, major shareholders, and company insiders. At present, SLRN has 68.45M shares in float.

SLRN short ratio: what is it?

Short ratio is calculated by dividing the number of short shares, short interest or bets that shareholders will sell short from the average daily volume. A higher ratio indicates longer times needed to repurchase borrowed shares (sold). The short ratio for SLRN is 3.8.

Acelyrin (SLRN) insider trading activity: Get Latest News Today

Stock Outstanding Shares

Making an investment decision in the stock market involves a certain amount of risk, so it's important to thoroughly review a company's stock before making any decisions. Stock float, number of short positions and outstanding shares are among the many factors an investor should take into account.

ShortableNo

OptionableNo

Short Percent Of Outstanding Shares3.54

Short Percent Of Float3.85

Shares Outstanding100.95M

Shares Float68.45M

Shares Short3.57M

Short Ratio3.8

3.85%

Short % of Float

3.54%

Short % of Shares Outstanding

Market Insider

Investors cannot turn a blind eye to insiders as well as institutional ownership. They need to follow insider trades to determine the direction the stock is likely to take.

Major Holders Summary

7.15% Percentage of Shares held by All Insiders

91.98% Percentage of Shares held by All Institutions

99.06% Percentage of Float held by Institutions

152

Number of Institutions Holding Shares

Institutional Ownership

About 91.98% of SLRN shares are held by financial institutions. OPALEYE MANAGEMENT INC. is the top corporate investor, holding 1.62M shares valued at $3.99M. A 1.63% stake in Acelyrin, Inc. is owned by the company. STATE STREET CORP owns 1.42M shares valued at $3.51M, which translates its holding of 1.41% of the stake in the company.

Date	Holder	% Stake	Shares Held	Total Value ($)	Shares	% Change in Portfolio
Mar 31, 2025	OPALEYE MANAGEMENT INC.	1.63%	1.62M	3.99M	-620K	-27.74%
Mar 31, 2025	STATE STREET CORP	1.41%	1.42M	3.51M	-21.21K	-1.47%
Mar 31, 2025	TOWERVIEW LLC	0.54%	540K	1.33M	540K	+100.00%
Mar 31, 2025	GOLDMAN SACHS GROUP INC	0.35%	351.41K	867.98K	-218.5K	-38.34%
Mar 31, 2025	LOS ANGELES CAPITAL MANAGEMENT LLC	0.11%	109.61K	270.74K	-12.39K	-10.16%
Mar 31, 2025	INVESCO LTD.	0.08%	85.52K	211.24K	59.75K	+231.91%
Mar 31, 2025		0.2%	202.24K	499.53K	202.24K	+100.00%
Mar 31, 2025	MADISON AVENUE PARTNERS, LP	4.17%	4.14M	10.23M	4.14M	+100.00%
Mar 31, 2025	ORBIMED ADVISORS LLC	4.03%	4M	9.88M	0	0
Mar 31, 2025	MORGAN STANLEY	0.27%	275.82K	681.26K	-2.05M	-88.13%
Mar 31, 2025	GEODE CAPITAL MANAGEMENT, LLC	1.76%	1.77M	4.38M	64.73K	+3.79%
Mar 31, 2025	BALYASNY ASSET MANAGEMENT L.P.	1.3%	1.31M	3.22M	1.31M	+100.00%
Mar 31, 2025	ALYESKA INVESTMENT GROUP, L.P.	0.61%	615.88K	1.52M	-900K	-59.37%
Mar 31, 2025	CHARLES SCHWAB INVESTMENT MANAGEMENT INC	0.54%	544.58K	1.35M	-69.9K	-11.38%
Mar 31, 2025	WELLINGTON MANAGEMENT GROUP LLP	0.18%	179.15K	442.5K	-1.39K	-0.77%
Mar 31, 2025	CITADEL ADVISORS LLC	0.18%	176.44K	435.8K	-4.04M	-95.81%
Mar 31, 2025	STONEPINE CAPITAL MANAGEMENT, LLC	0.17%	167.58K	413.92K	34.71K	+26.12%
Mar 31, 2025	MILLENNIUM MANAGEMENT LLC	0.15%	149.3K	368.77K	-4.57M	-96.83%
Mar 31, 2025	FRANKLIN RESOURCES INC	0.13%	127.02K	313.75K	36.47K	+40.27%
Mar 31, 2025	AMERICAN CENTURY COMPANIES INC	0.09%	91.39K	225.73K	12.52K	+15.88%
Mar 31, 2025	ALLIANCEBERNSTEIN L.P.	0.07%	73.67K	181.97K	0	0
Mar 31, 2025	HGC INVESTMENT MANAGEMENT INC.	0.07%	70.43K	173.95K	70.43K	+100.00%
Mar 31, 2025	DEUTSCHE BANK AG\	0.06%	61.54K	152K	-8.46K	-12.09%
Mar 31, 2025	BLAIR WILLIAM & CO/IL	0.14%	138.6K	342.33K	0	0
Mar 31, 2025	SUSQUEHANNA FUNDAMENTAL INVESTMENTS, LLC	0.27%	273.41K	675.33K	35.95K	+15.14%
Mar 31, 2025	NUVEEN, LLC	0.2%	202.24K	499.53K	202.24K	+100.00%
Mar 31, 2025	AQR CAPITAL MANAGEMENT LLC	0.19%	193.32K	477.51K	193.32K	+100.00%
Mar 31, 2025	BANK OF NEW YORK MELLON CORP	0.17%	173.28K	428K	-3.62K	-2.05%
Mar 31, 2025	BRIDGEWAY CAPITAL MANAGEMENT, LLC	0.14%	140.9K	348.02K	140.9K	+100.00%
Mar 31, 2025	MONACO ASSET MANAGEMENT SAM	0.14%	139.6K	344.81K	139.6K	+100.00%
Mar 31, 2025	UBS GROUP AG	0.1%	103.53K	255.71K	-83.48K	-44.64%
Mar 31, 2025	XTX TOPCO LTD	0.1%	103.05K	254.53K	92.68K	+893.80%
Mar 31, 2025	RHUMBLINE ADVISERS	0.1%	102.17K	252.37K	-6.07K	-5.61%
Mar 31, 2025	SUSQUEHANNA INTERNATIONAL GROUP, LLP	0.09%	90.67K	223.95K	55.85K	+160.36%
Mar 31, 2025	BARCLAYS PLC	0.08%	82.87K	204.69K	-33.77K	-28.95%
Mar 31, 2025	ALPS ADVISORS INC	0.07%	74.64K	184.36K	-6.49K	-8.00%
Mar 31, 2025	AYURMAYA CAPITAL MANAGEMENT COMPANY, LP	9.27%	9.33M	23.06M	0	0
Mar 31, 2025	T. ROWE PRICE INVESTMENT MANAGEMENT, INC.	4.62%	4.65M	11.49M	-8.22M	-63.88%
Mar 31, 2025	VANGUARD GROUP INC	4.05%	4.08M	10.08M	-304	-0.01%
Mar 31, 2025	TYBOURNE CAPITAL MANAGEMENT (HK) LTD	2.89%	2.91M	7.18M	0	0
Mar 31, 2025	RENAISSANCE TECHNOLOGIES LLC	0.6%	599.8K	1.48M	132.88K	+28.46%
Mar 31, 2025	NORTHERN TRUST CORP	0.59%	598.15K	1.48M	-31.9K	-5.06%
Mar 31, 2025	JPMORGAN CHASE & CO	0.59%	590.85K	1.46M	-27.28K	-4.41%
Mar 31, 2025	CANTOR FITZGERALD, L. P.	0.58%	588.66K	1.45M	588.66K	+100.00%
Mar 31, 2025	GENERAL ATLANTIC, L.P.	2.68%	2.7M	6.66M	0	0
Mar 31, 2025	SAMSARA BIOCAPITAL, LLC	2.54%	2.52M	6.23M	0	0
Mar 31, 2025	PALO ALTO INVESTORS LP	1.81%	1.79M	4.43M	0	0
Mar 31, 2025	TANG CAPITAL MANAGEMENT LLC	9.75%	9.82M	24.25M	9.82M	+100.00%
Mar 31, 2025	BLACKROCK, INC.	5.77%	5.81M	14.34M	-215.77K	-3.58%
Mar 31, 2025	VENBIO PARTNERS LLC	3.83%	3.81M	9.4M	0	0
Mar 31, 2025	VELAN CAPITAL INVESTMENT MANAGEMENT LP	3.39%	3.37M	8.32M	3.37M	+100.00%

Insiders

Among the SLRN insiders holding of 7.15% of the stake in company, WESTLAKE BIOPARTNERS FUND II, L.P., 10 percent owner, holds the largest shares of 9.79M. LIN SHAO-LEE, Chief Executive Officer, is the second largest SLRN insider with ownership of 1.6M shares. KIM MINA, Chief Executive Officer, stands third with possession of 671.75K shares of that stake.

Insiders	Designation	Shares Held
WESTLAKE BIOPARTNERS FUND II, L.P.	10 percent owner	9.79M
LIN SHAO-LEE	Chief Executive Officer	1.6M
KIM MINA	Chief Executive Officer	671.75K
MPOFU SHEPHARD	Chief Medical Officer	121.79K
MURUGAN AMAR	Chief Legal Officer	121.59K
GOSEBRUCH HENRY O	director	50K
SVORONOS DAWN	director	15K
BECKER DANIEL J.	director	3K

Buying/Selling by Insiders

Date	Insider	Type	Cost	Shares	Value ($)	Shares Total
Mar 17, 2025	KIM MINA	SALE	2.74	17.99K	49.35K	671.75K
Mar 17, 2025	MURUGAN AMAR	SALE	2.74	3.91K	10.74K	121.59K
Mar 17, 2025	MPOFU SHEPHARD	SALE	2.74	3.21K	8.81K	121.79K
Jul 17, 2024	BECKER DANIEL J.	SALE	6.86	1	6.86	3K
Jan 02, 2024	LIN SHAO-LEE	SALE	7.41	10.69K	79.19K	1.6M
May 09, 2023	WESTLAKE BIOPARTNERS FUND II, L.P.	PURCHASE	18.00	1.25M	22.5M	9.79M
May 09, 2023	SVORONOS DAWN	PURCHASE	18.00	15K	270K	15K
May 09, 2023	GOSEBRUCH HENRY O	PURCHASE	18.00	50K	900K	50K
May 09, 2023	BECKER DANIEL J.	PURCHASE	18.00	3K	54K	3K

SLRN Stock Ownership Breakdown

Acelyrin

Stock Outstanding Shares

Market Insider

Institutional Ownership

Insiders

Buying/Selling by Insiders

Frequently Asked Questions

Stock Outstanding Shares

Market Insider

Institutional Ownership

Insiders

Buying/Selling by Insiders

Frequently Asked Questions