How many institutions held GRTS - Gritstone bio, Inc. - Common Stock, $0.0001 par value per share in Q1 2021?

96 institutional investors reported GRTS - Gritstone bio, Inc. - Common Stock, $0.0001 par value per share for Q1 2021. Use the holders table for investor-level position and value details.

Gritstone bio, Inc. - Common Stock, $0.0001 par value per share (GRTS)

Q: What does CUSIP 39868T105 represent in this 13F holders report?

CUSIP 39868T105 is the security identifier for GRTS - Gritstone bio, Inc. - Common Stock, $0.0001 par value per share used to aggregate holder disclosures.

CUSIP: 39868T105

Q1 2021 13F Holders as of 31 Mar 2021

Security type / class: Equity / Common Stock, $0.0001 par value per share
Total 13F shares: 34,045,816
Total 13F value: $321,066,530
Share change: +2,069,299
Put/Call ratio: 49%
SEC-reported price per share: $9.43
Number of holders: 96
Value change: +$42,420,523
Number of buys: 64
Number of sells: 31
Shares outstanding: 160,529,963

Security key

39868T105

Report period

Q1 2021

Institutions

Top holders

GRTS full security history Ownership snapshot Full 13F holder table Newer quarter: Q3 2025 Gritstone bio, Inc. SEC filings Gritstone bio, Inc. company facts

Broader feeds

Latest 13F filings Latest 13D/G filings Investors directory

Reporting periods

Holder history for CUSIP 39868T105

Newer quarter: Q3 2025

Recent filing periods:

Q4 2025 Q3 2025

Ownership snapshot

Top reported holders of GRTS - Gritstone bio, Inc. - Common Stock, $0.0001 par value per share (13F + 13D/G + 3/4/5)

Grouped by holder across the latest SEC ownership disclosures. Start with comparable ownership when available, then verify the linked 13F, 13D/G, or 3/4/5 evidence.

Comparable stake leader

Versant Venture Managemen...

Disclosed value leader

Versant Venture Managemen...

Comparable rows

0/15

Latest evidence

31 Dec 2020

13F Highest disclosed value: $17,536,000 15 rows are not safely comparable across share classes. Showing 1-6 of 15 holder rows.

Quick read

Versant Venture Management, LLC has the largest disclosed position value at $17.54M.

0 of 15 rows have a safely comparable ownership percentage. Use this as a filing-backed starting point, then open the detailed table for source links, reporting role, position value, share count, and filing date.

Open SEC evidence Opens Versant Venture Management, LLC's linked filing trail.

Disclosed position value Top 5

Versant Venture Management, LLC $17.54M

EcoR1 Capital, LLC $13.48M

Redmile Group, LLC $12.06M

FMR LLC $11.31M

BVF INC/IL $10.62M

Value bars compare disclosed positions; verify each figure against the linked filing evidence.

Detailed SEC evidence table Showing 1-6 of 15 holder rows

Holder	Evidence	Ownership %	Position	12M Net Δ	As of
Versant Venture Management, LLC	13F Company 13F	— denominator unverified	$17,536,000 4,450,638 shares	—	31 Dec 2020
EcoR1 Capital, LLC	13F Company 13F	— denominator unverified	$13,480,000 3,421,287 shares	—	31 Dec 2020
Redmile Group, LLC	13F Company 13F	— denominator unverified	$12,056,000 3,059,794 shares	—	31 Dec 2020
FMR LLC	13F Company 13F	— denominator unverified	$11,312,000 2,870,984 shares	—	31 Dec 2020
BVF INC/IL	13F Company 13F	— denominator unverified	$10,620,000 2,695,418 shares	—	31 Dec 2020
Blackstone Inc.	13F Company 13F	— denominator unverified	$10,116,000 2,567,445 shares	—	31 Dec 2020

How to read this table

Rows are grouped by holder and ranked first by SEC-reported ownership % when it is safely comparable, then by disclosed holdings value. — indicates unavailable or non-comparable values; "mixed-class rows" means the latest filing spans non-comparable classes.

13F holder rows

Institutional holders as of Q1 2021

Investor-level positions for this CUSIP, loaded as an interactive table.

Institutions

34,045,816

Rows available

Investor	Option	Weight %	Change %	SEC-reported value	* Price	Shares	Share Change	Activity	Report Period

^* SEC-reported price is the security price as of the portfolio date and can indicate the last known price at which the security was still held. The marker flags a reported price that did not pass the local price check.

Compare Q1 2021 vs Q3 2025 Across Filers

Q3 2025 holders

Q1 2021 holders

Holder diff

Investor	Q3 2025 Shares	Q1 2021 Shares	Share Diff	Share Chg %	Q3 2025 value	Q1 2021 value	Value change	Value Chg %

Trend: ostatnie 8 kwartałów (+ wybrane okresy porównania).

Quarterly Holders Trend

Quarterly Value Trend

Quarterly Shares Trend