Home

Michael Parini

CIK 1661567 · Chief Legal Officer · last filed 2026-09-03

Michael Parini is a Chief Legal Officer who has filed 67 SEC Form 4 insider transactions across 2 companies since 2016. The most recent filing, for BIIB, was dated Sep 3, 2026. Across all open-market trades the lifetime net is −$45.4M, making them a net seller over the disclosed history. Current disclosed insider exposure totals $15.9M across reported positions. 67 SEC filings were submitted jointly with VERTEX PHARMACEUTICALS INC / MA.

"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

$15.89M

Companies

2

Total Filings

67

Lifetime Open-Market Net

-$45.43M

Filer Profile

Reported Address
C/O BIOGEN INC.
225 BINNEY STREET
CAMBRIDGE, MA 02142
Related Filers
VERTEX PHARMACEUTICALS INC / MA — 67 joint filings, latest 2021-02-26
BIOGEN INC. — 2 joint filings, latest 2026-09-03
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
BIIB Chief Legal Officer — $217.15 — $0 1 2026-09-03
VRTX EVP, Chief Adm, Leg & BD Off 30,837 $515.44 $15.89M -$45.43M 66 2021-02-26

Recent Filings

67 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
2026-09-03 BIIB Grant (A) — $0 EDGAR
2021-02-26 VRTX Mixed −5,444 -$1.17M EDGAR
2021-02-19 VRTX Mixed −14,065 -$2.98M EDGAR
2021-02-16 VRTX Sell (S) −4,318 -$909.2K EDGAR
2021-02-12 VRTX Tax (F) −2,563 -$548.9K EDGAR
2021-02-09 VRTX Mixed — -$248.0K EDGAR
2021-02-05 VRTX Mixed +30,389 -$52.0K EDGAR
2020-11-18 VRTX Sell (S) −91 -$20.3K EDGAR
2020-11-06 VRTX Mixed — -$305.7K EDGAR
2020-08-10 VRTX Mixed — -$141.4K EDGAR
Showing 1–10 of 67
Page 1 of 7
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.