ROBERT NELSEN

CIK 1219042 · last filed 2026-06-08

ROBERT NELSEN is a corporate insider who has filed 132 SEC Form 4 insider transactions across 18 companies since 2012. The most recent filing, for PRME, was dated Jun 8, 2026. Across all open-market trades the lifetime net is +$85.6M, making them a net buyer over the disclosed history. Current disclosed insider exposure totals $445.6M across reported positions. 84 SEC filings were submitted jointly with KEITH CRANDELL.

"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.

Loading insider history…
Disclosed Exposure

$445.55M

Companies

18

Total Filings

132

Lifetime Open-Market Net

$85.61M

Filer Profile

Reported Address
8755 W. HIGGINS ROAD
SUITE 1025
CHICAGO, IL 60631
Related Filers
KEITH CRANDELL — 84 joint filings, latest 2026-07-06
CLINTON BYBEE — 65 joint filings, latest 2026-07-06
STEVEN GILLIS — 42 joint filings, latest 2026-07-06
ARCH Venture Fund VII, L.P. — 21 joint filings, latest 2020-12-22
ARCH Venture Partners VII, L.P. — 21 joint filings, latest 2020-12-22
ARCH Venture Partners VII, LLC — 21 joint filings, latest 2020-12-22
ARCH VENTURE FUND VI LP — 19 joint filings, latest 2020-11-24
Kristina Burow — 19 joint filings, latest 2026-07-06
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
PRME Director 6,128,297 $2.90 $17.77M $43.60M 8 2026-06-08
SANA Director 12,447,375 $2.94 $36.66M $10.00M 15 2026-06-05
LYEL Director 910,318 $9.85 $8.97M $0 5 2024-06-17
VIR Director 7,874,803 $10.66 $83.95M $20.00M 22 2024-06-03
BOLD 10%+ Owner 1,048,433 $2.66 $2.79M $12.80M 1 2024-04-04
NMRA 10%+ Owner 3,758,883 $0.68 $2.55M $4.20M 1 2023-09-27
DNLI Director 9,681,181 $20.39 $197.40M $0 8 2021-06-04
Karuna Therapeutics, Inc. (KRTX) Delisted Director 1,461,704 $329.83 $482.11M $3.20M 6 2021-04-15
BEAM Director 3,535,572 $24.27 $85.81M $0 3 2021-04-02
Unity Biotechnology, Inc. (UBX) Delisted Director 168,242 $0.20 $33.7K $0 4 2020-06-22
Sienna Biopharmaceuticals, Inc. (SNNA) Delisted Director 2,538,641 — — $0 3 2018-06-05
Juno Therapeutics, Inc. (JUNO) Delisted Director 3,234 — — $0 13 2018-03-07
Syros Pharmaceuticals, Inc. (SYRS) Delisted Director 463,714 $0.00 $185 $5.00M 4 2017-09-22
AGIO Director 118,404 $32.58 $3.86M -$20.75M 10 2017-03-07
Sage Therapeutics, Inc. (SAGE) Delisted Director 1,232,649 $8.68 $10.70M $0 6 2015-11-12
KYTHERA BIOPHARMACEUTICALS INC (KYTH) Delisted Director 957,604 — — $0 8 2015-03-26
Bellerophon Therapeutics, Inc. (BLPH) Delisted Director 50,200 $0.01 $602 $2.55M 1 2015-02-23
FATE Director 2,473,188 $2.35 $5.81M $5.00M 1 2013-10-07

Recent Filings

132 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
2026-06-08 PRME Grant (A) — $0 EDGAR
2026-06-05 SANA Grant (A) — $0 EDGAR
2025-08-05 PRME Mixed — $0 EDGAR
2025-08-01 PRME Buy (P) +3,030,300 $10.00M EDGAR
2025-06-09 SANA Grant (A) — $0 EDGAR
2025-06-05 PRME Grant (A) — $0 EDGAR
2024-07-15 SANA Grant (A) — $0 EDGAR
2024-06-17 LYEL Grant (A) — $0 EDGAR
2024-06-14 PRME Grant (A) — $0 EDGAR
2024-06-07 SANA Grant (A) — $0 EDGAR
Showing 1–10 of 132
Page 1 of 14
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.