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$ Value

$0

Shares

53,521

Price

$0

Filed

Oct 27

Insider

Name

GRAYZEL DAVID S.

Title

CIK

0001732786

Roles

Director

Transaction Details

Transaction Date

2025-10-23

Code

A

Table

Derivative

Ownership

Direct

Equity Swap

No

Shares After

53,521

Footnotes

The shares underlying this option shall vest and become exercisable in full upon the earlier of (i) October 23, 2026 or (ii) the date of the Issuer's next annual meeting of stockholders, subject to the Reporting Person's continued service on such vesting date. | This option was granted to the Reporting Person, a director of the Issuer. The proceeds of any sale of shares of common stock issued to the Reporting Person upon exercise of this option will be transferred to Atlas Venture Life Science Advisors, LLC and as such, the Reporting Person disclaims ownership of such securities reported herein for purposes of Section 16 of the Securities Exchange Act of 1934, as amended, except to the extent of his pecuniary interest therein, if any.

Filing Info

Accession No.

0001193125-25-251983

Form Type

4

Issuer CIK

0001661998

GRAYZEL DAVID S.'s History

Date Ticker Type Value
2026-01-15 QTTB A $45K
2025-10-23 QTTB A $0

Other Insiders at QTTB (90d)

Insider Bought Sold Last
LAPORTE KATHLEEN 2026-01-15
Morrison Jodie Pope
CEO
$45K 2026-02-25
Kalowski Lee
CFO and President
$18K 2026-02-25
Lundberg Sven Ante 2026-01-15
GRAYZEL DAVID S. 2026-01-15
Violette Shelia M.
Chief Scientific Officer
$13K 2026-02-25