Paul Walker

CIK 1553150 · View on SEC EDGAR ↗

Activist

First SEC filing: May 7, 2026 · Latest: May 7, 2026

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Insider at

Insider transactions

3 buys (P) 0 sells (S) Net: $20,000,000 + 32 non-open-market transactions below Avg return of open purchases vs now: 39.9% last 12 months, based on the transactions shown below

Price change vs current quote, split-adjusted for corporate actions since the filing — not benchmarked, not annualized, not size-weighted

32 other filings hidden
Date Ticker Code Shares Price Value Owned after Δ own A/D vs now
March 10, 2026 KRRO P 242,945 $11.11 $2,699,119 242,945 Indirect — Acquired 24.8% (price as of 2026-08-19)
March 10, 2026 KRRO P 207,100 $11.11 $2,300,881 1,297,893 Indirect +18.99% Acquired 24.8% (price as of 2026-08-19)
Feb. 9, 2026 SGP P 937,500 $16.00 $15,000,000 6,035,038 Indirect +18.39% Acquired 69.9% (price as of 2026-08-19)
Sept. 16, 2024 MBX P 500,000 $16.00 $8,000,000 3,614,486 Indirect +16.05% Acquired 317.0% (price as of 2026-08-19)
April 22, 2024 KRRO P 17,857 $56.00 $999,992 1,090,793 Indirect +1.66% Acquired -75.2% (price as of 2026-08-19)
July 17, 2023 SVRA P 333,333 $3.00 $999,999 24,471,264 Indirect +1.38% Acquired 82.0% (price as of 2026-08-19)
April 11, 2022 TRVI P 3,000,000 $1.90 $5,700,000 3,000,000 Indirect — Acquired 891.1% (price as of 2026-08-19)
April 11, 2022 TRVI P 948,948 $1.90 $1,803,001 948,948 Indirect — Acquired 891.1% (price as of 2026-08-19)
April 11, 2022 TRVI P 2,631,578 $1.90 $4,999,998 10,421,428 Indirect +33.78% Acquired 891.1% (price as of 2026-08-19)
Oct. 18, 2021 TRVI P 1,851,852 — — 1,851,852 Indirect — Acquired (price as of 2026-08-19)
Oct. 18, 2021 TRVI P 1,851,852 — — 1,851,852 Indirect — Acquired (price as of 2026-08-19)
Oct. 18, 2021 TRVI P 1,851,852 — — 7,789,850 Indirect +31.19% Acquired (price as of 2026-08-19)
June 28, 2021 GLUE P 1,050,000 $19.00 $19,950,000 7,692,298 Indirect +15.81% Acquired -16.2% (price as of 2026-08-19)
March 16, 2021 MRKR P 5,714,285 $1.75 $9,999,999 10,714,285 Indirect +114.29% Acquired -93.2% (price as of 2026-08-19)
April 3, 2020 TRVI S 564 $2.66 $1,500 5,937,998 Indirect -0.01% Disposed 607.9% (price as of 2026-08-19)
July 22, 2019 MIRM P 450,000 $15.00 $6,750,000 4,186,243 Indirect +12.04% Acquired 583.5% (price as of 2026-08-19)
May 9, 2019 TRVI P 1,500,000 $10.00 $15,000,000 4,438,562 Indirect +51.05% Acquired 88.3% (price as of 2026-08-19)
May 9, 2019 TRVI P 1,000,000 $10.00 $10,000,000 2,938,562 Indirect +51.58% Acquired 88.3% (price as of 2026-08-19)

P = Open-market purchase · S = Sale · A = Grant/award · M = Option exercise · G = Gift · F = Tax withholding

Insider transactions are not a recommendation; sales are often driven by liquidity or tax reasons.

Derivative holdings (Form 4 Table II)

Options, RSUs and convertible securities reported on Form 4 Table II.

Date Ticker Security Underlying Exercise price Expiration Shares A/D
March 10, 2026 KRRO Pre-Funded Warrants Common Stock (242,945) $0.00 — 242,945 Acquired
Feb. 9, 2026 SGP Series B Preferred Stock Common Stock (402,273) — — 402,273 Disposed
Feb. 9, 2026 SGP Series A Preferred Stock Common Stock (954,990) — — 954,990 Disposed
Feb. 9, 2026 SGP Series D Preferred Stock Common Stock (737,962) — — 737,962 Disposed
Feb. 9, 2026 SGP Series C-2 Preferred Stock Common Stock (1,370,168) — — 1,370,168 Disposed
Feb. 9, 2026 SGP Series C-1 Preferred Stock Common Stock (1,370,168) — — 1,370,168 Disposed
Feb. 9, 2026 SGP Series B Preferred Stock Common Stock (1,619,240) — — 1,619,240 Disposed
Sept. 16, 2024 MBX Series B Convertible Preferred Stock Common Stock (2,091,383) — — 25,142,840 Disposed
Sept. 16, 2024 MBX Series A Convertible Preferred Stock Common Stock (1,023,103) — — 12,299,854 Disposed
April 11, 2022 TRVI Pre-Funded Warrants Common Stock (3,000,000) $0.00 — 3,000,000 Acquired
Oct. 18, 2021 TRVI 7-Year Common Stock Warrant Common Stock (1,851,852) $1.37 Oct. 18, 2028 1,851,852 Acquired
Oct. 18, 2021 TRVI 3.5-Year Common Stock Warrant Common Stock (1,851,852) $1.37 April 18, 2025 1,851,852 Acquired
June 28, 2021 GLUE Series A-2 convertible preferred stock Common Stock (2,715,968) — — 9,588,725 Disposed
June 28, 2021 GLUE Series B convertible preferred stock Common Stock (3,257,328) — — 11,500,000 Disposed
June 28, 2021 GLUE Series C convertible preferred Stock Common Stock (669,002) — — 2,361,912 Disposed
April 3, 2020 TRVI Call Option (right to buy) Common Stock (1,500,000) $0.00 May 6, 2022 1,500,000 Disposed
July 22, 2019 MIRM Series A Preferred Stock Common Stock — — 29,889,945 Disposed
May 9, 2019 TRVI Series C Preferred Stock Common Stock (1,938,562) — — 17,099,315 Disposed

Exercise/conversion price is blank when not applicable (e.g. RSUs).

Initial ownership (Form 3) 20 holdings

Securities held when first becoming an insider, per SEC Form 3.

Date Ticker Security Shares Ownership
Feb. 5, 2026 SGP Series B Preferred Stock→ Common Stock (1,619,240) 1,619,240 Indirect
Feb. 5, 2026 SGP Series C-1 Preferred Stock→ Common Stock (1,370,168) 1,370,168 Indirect
Feb. 5, 2026 SGP Series C-2 Preferred Stock→ Common Stock (1,370,168) 1,370,168 Indirect
Feb. 5, 2026 SGP Series D Preferred Stock→ Common Stock (737,962) 737,962 Indirect
Feb. 5, 2026 SGP Series A Preferred Stock→ Common Stock (954,990) 954,990 Indirect
Feb. 5, 2026 SGP Series B Preferred Stock→ Common Stock (402,273) 402,273 Indirect
Sept. 12, 2024 MBX Series A Convertible Preferred Stock→ Common Stock (1,023,103) 1,023,103 Indirect
Sept. 12, 2024 MBX Series B Convertible Preferred Stock→ Common Stock (2,091,383) 2,091,383 Indirect
Nov. 7, 2023 KRRO Common Stock 1,072,936 Indirect
June 23, 2021 GLUE Series A-2 convertible preferred stock→ Common Stock (2,715,968) 2,715,968 Indirect
June 23, 2021 GLUE Series B convertible preferred stock→ Common Stock (3,257,328) 3,257,328 Indirect
June 23, 2021 GLUE Series C convertible preferred stock→ Common Stock (669,002) 669,002 Indirect
March 16, 2021 SVRA Common Stock 24,137,931 Indirect
Jan. 29, 2020 BDTX Series B Preferred Stock→ Common Stock (2,176,957) 2,176,957 Indirect
Jan. 29, 2020 BDTX Series C Preferred Stock→ Common Stock (471,800) 471,800 Indirect
July 17, 2019 MIRM Series A Preferred Stock→ Common Stock — Indirect
May 7, 2019 TRVI Series C Preferred Stock→ Common Stock (1,937,970) 1,937,970 Indirect
May 7, 2019 TRVI Stock Option (Right to Buy)→ Common Stock (1,500,000) 1,500,000 Indirect
Oct. 18, 2018 MRKR Common Stock 5,000,000 Indirect
Oct. 18, 2018 MRKR Warrant to Purchase Common Stock (right to buy)→ Common Stock (3,750,000) 3,750,000 Indirect