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ARCH Venture Partners VIII, LLC

CIK 1616165 · last filed 2020-10-20

ARCH Venture Partners VIII, LLC is a corporate insider who has filed 2 SEC Form 4 insider transactions across 2 companies since 2019. The most recent filing, for CDAK, was dated Oct 20, 2020. Across all open-market trades the lifetime net is +$24.7M, making them a net buyer over the disclosed history. Current disclosed insider exposure totals $450.6K across reported positions. The firm reports its address in Chicago, IL. 23 SEC filings were submitted jointly with CLINTON BYBEE.

"Disclosed insider exposure" sums this person's most-recently-reported share counts across each company they're an insider in, multiplied by the current underlying price. It is not net worth — it misses retail holdings, private investments, real estate, index funds, and any company where the person isn't an SEC-reporting insider. For informational purposes only.

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Disclosed Exposure

$450.6K

Companies

2

Total Filings

2

Lifetime Open-Market Net

$24.68M

Filer Profile

Reported Address
8755 W. HIGGINS ROAD, SUITE 1025
CHICAGO, IL 60631
Phone
(773) 380-6600
State of Incorporation
DE
Related Filers
CLINTON BYBEE — 23 joint filings, latest 2022-09-15
ARCH Venture Fund VIII Overage, L.P. — 22 joint filings, latest 2025-10-29
KEITH CRANDELL — 18 joint filings, latest 2022-09-15
ROBERT NELSEN — 17 joint filings, latest 2022-09-15
ARCH Venture Fund VIII, L.P. — 16 joint filings, latest 2022-09-15
ARCH Venture Fund VII, L.P. — 8 joint filings, latest 2025-10-29
ARCH Venture Partners VII, L.P. — 8 joint filings, latest 2025-10-29
ARCH Venture Fund X Overage, L.P. — 4 joint filings, latest 2025-10-29
Profile details as reported on the filer's SEC submissions — for individual insiders the address is often in care of the issuer. Related filers are identified from jointly filed SEC submissions and shared reported addresses. View filings on SEC EDGAR.

Holdings By Company

Latest on-record share count from this person's most recent non-derivative Form 4 transaction in each company. Disclosed exposure = shares × current underlying price.
Symbol Role Shares Price Disclosed Exposure Lifetime OM Net Filings Latest Filed
Codiak BioSciences, Inc. (CDAK) Delisted 10%+ Owner 1,848,535 $0.06 $105.4K $24.68M 1 2020-10-20
FIXX 10%+ Owner 35,609 $12.65 $450.6K $0 1 2019-05-23

Recent Filings

2 filings
Insider activity across all companies, newest first. Form 4 rows are post-trade confirmations (buys, sells, grants, exercises). Notice (144) rows are pre-trade notices of intent to sell restricted or control stock under Rule 144 — they may not all execute. Compare adjacent dates to see which notices became actual sales.
Filed Symbol Action Net Shares Net $ Link
2020-10-20 Codiak BioSciences, Inc. (CDAK) Delisted Mixed +26,530,945 $24.68M EDGAR
2019-05-23 FIXX Other (J) −2,100,007 $0 EDGAR
Form 4 codes: P = open-market purchase · S = open-market sale · A = grant/award · M = option exercise · F = tax withholding at vest · G = bona-fide gift · D = disposition to issuer · J = other (see filing footnote). Only P / S codes carry directional signal.
Notice (144 / 144/A): Form 144 is a notice of intent to sell restricted/control stock under Rule 144, filed before the sale; 144/A is an amendment. Many notices are pre-scheduled under Rule 10b5-1 plans. A Form 4 with code S typically follows within a few days when the planned sale executes; missing follow-up Form 4s suggest the notice was cancelled or modified.