Birchler Brian
Officer · IONS
As of 2026-09-27, Birchler Brian has 36 Form 4 transactions on record across 1 company — 20 in the trailing 12 months.
Everything this person has disclosed to the SEC on Form 4 — across every company they file for — reconstructed from the public record. A filing history, not a tip sheet.
Pattern in the record: open-market sales filed in April in multiple years since 2024 — a recurring calendar cadence, more consistent with scheduled activity than a one-off decision.
Reconstructed holdings
- Direct $4.6M
- Indirect $0
| IONS | direct | 102,883 sh | $4.6M |
Reconstructed from this person's own Form 4 filings — the total each filing reported owning afterward, priced at the close on the as-of date shown. A filed position can lag the real one.
Direct and indirect holdings (e.g. through a trust or fund) are tagged separately, as filed.
Trades by company
Filing ledger
| Date | Company | Action | Shares @ price | Value | Ownership Δ | Owned after | Filing |
|---|---|---|---|---|---|---|---|
| 2026-04-16 | IONS | Sale | 973 @ $75.04 | $73K | −1.4% of holding | 67,500 | Form 4 |
| 2026-01-30 | IONS | Sale | 6,179 @ $83.03 | $513K | −8.5% of holding | 66,247 | Form 4 |
| 2026-01-16 | IONS | Sale | 8,480 @ $75.11 | $637K | −12.3% of holding | 60,435 | Form 4 |
| 2025-11-06 | IONS | Sale | 8,000 @ $76.17 | $609K | −14.1% of holding | 48,826 | Form 4 |
| 2025-10-15 | IONS | Sale | 12,425 @ $72.23 | $897K | −17.9% of holding | 56,826 | Form 4 |
| 2025-10-14 | IONS | Sale | 11,475 @ $72.03 | $827K | −16.8% of holding | 56,826 | Form 4 |
| 2025-04-16 | IONS | Sale | 680 @ $28.37 | $19K | −1.2% of holding | 56,660 | Form 4 |
| 2025-01-16 | IONS | Sale | 5,400 @ $32.70 | $177K | −8.9% of holding | 55,051 | Form 4 |
| 2024-04-16 | IONS | Sale | 905 @ $41.66 | $38K | −1.9% of holding | 46,156 | Form 4 |
27 award / exercise / gift records — not counted as purchases
| Date | Company | Action | Shares | Owned after | Filing |
|---|---|---|---|---|---|
| 2026-08-31 | IONS | Other acquisition | 58 | 102,883 | Form 4 |
| 2026-04-15 | IONS | Option exercise | 1,875 | 48,926 | Form 4 |
| 2026-04-15 | IONS | Option exercise | 1,875 | 68,473 | Form 4 |
| 2026-02-27 | IONS | Other acquisition | 351 | 66,598 | Form 4 |
| 2026-01-29 | IONS | Award / grant | 11,991 | 72,426 | Form 4 |
| 2026-01-15 | IONS | Award / grant | 25,800 | 79,138 | Form 4 |
| 2026-01-15 | IONS | Award / grant | 9,675 | 50,801 | Form 4 |
| 2026-01-15 | IONS | Option exercise | 20,089 | 41,126 | Form 4 |
| 2026-01-15 | IONS | Option exercise | 20,089 | 68,915 | Form 4 |
| 2026-01-02 | IONS | Award / grant | 19,350 | 19,350 | Form 4 |
| 2025-10-15 | IONS | Option exercise | 12,425 | 69,251 | Form 4 |
| 2025-10-15 | IONS | Option exercise | 12,425 | 0 | Form 4 |
| 2025-10-14 | IONS | Option exercise | 11,475 | 68,301 | Form 4 |
| 2025-10-14 | IONS | Option exercise | 11,475 | 12,425 | Form 4 |
| 2025-08-29 | IONS | Other acquisition | 166 | 56,826 | Form 4 |
| 2025-04-15 | IONS | Option exercise | 1,875 | 61,215 | Form 4 |
| 2025-04-15 | IONS | Option exercise | 1,875 | 57,340 | Form 4 |
| 2025-02-28 | IONS | Other acquisition | 414 | 55,465 | Form 4 |
| 2025-01-15 | IONS | Option exercise | 14,283 | 60,451 | Form 4 |
| 2025-01-15 | IONS | Option exercise | 14,283 | 63,090 | Form 4 |
| 2025-01-15 | IONS | Award / grant | 33,000 | 77,373 | Form 4 |
| 2025-01-15 | IONS | Award / grant | 22,000 | 53,338 | Form 4 |
| 2025-01-02 | IONS | Award / grant | 22,000 | 22,000 | Form 4 |
| 2024-08-30 | IONS | Other acquisition | 12 | 46,168 | Form 4 |
| 2024-04-15 | IONS | Option exercise | 1,875 | 47,061 | Form 4 |
| 2024-04-15 | IONS | Option exercise | 1,875 | 44,373 | Form 4 |
| 2024-02-29 | IONS | Other acquisition | 604 | 45,186 | Form 4 |
Source: SEC Form 4 filings. Each row links to its original filing.
Research tool, not investment advice — historical frequencies, not recommendations. A product of Marovel Technologies LLC. Full terms.