BARRETT MICHAEL G. 4

4 · MAGNITE, INC. · Filed Jun 17, 2026

AI-generated summary of this filing

Updated Jun 17, 2026

Magnite (MGNI) CEO Michael Barrett Exercises Options, Sells Shares

What Happened

Michael G. Barrett, CEO and Director of Magnite (MGNI), exercised a total of 278,596 stock options and immediately sold the resulting shares in two transactions on June 15–16, 2026. He exercised 178,596 options on 6/15 (strike $5.80) and sold those shares at a weighted average price about $16.59 (gross proceeds ≈ $2.96M). On 6/16 he exercised 100,000 options (strike $5.80) and sold them at $17.50 (gross proceeds $1.75M). Total exercise cost ≈ $1.62M; total gross sale proceeds ≈ $4.71M.

Key Details

Dates & trades:
- 2026-06-15: Exercised 178,596 options at $5.80 ($1,035,857) and sold 178,596 shares at a weighted avg ≈ $16.59 (proceeds ≈ $2,962,908). Sales ranged $15.945–$16.93 (footnote).
- 2026-06-16: Exercised 100,000 options at $5.80 ($580,000) and sold 100,000 shares at $17.50 (proceeds $1,750,000).
Total: 278,596 options exercised; 278,596 shares sold; gross proceeds ≈ $4.71M; aggregate exercise cost ≈ $1.62M.
Footnotes: June 15 exercise/sale were made pursuant to a Rule 10b5‑1 trading plan adopted March 13, 2026. Options were fully vested and were granted as compensation.
Derivative reporting: The Form 4 lists derivative dispositions at $0.00 reflecting conversion/settlement of the options upon exercise.
Timeliness: Form filed 2026-06-17 for transactions on 6/15–6/16 (filed within the typical 2‑business‑day Form 4 window).

Context

This was an exercise of vested options followed by immediate open‑market sales (a common “exercise-and-sell” or cashless-style outcome). Exercises were compensation-related (per filing) and at a $5.80 strike, well below the sale prices — producing the net proceeds described above.
The June 15 sales were executed under a pre-established 10b5‑1 plan, which sets scheduled trades regardless of short‑term insider views; that can reduce but does not eliminate questions about timing.
No ownership after-transaction total was provided in the excerpt; refer to the full Form 4 for Barrett’s post‑trade holdings.

Form 4

Period: 2026-06-15

DirectorCEO

Transactions

Exercise/Conversion
Common Stock
[F1]
2026-06-15$5.80/sh+178,596$1,035,857→ 581,670 total
Sale
Common Stock
[F1][F2]
2026-06-15$16.59/sh−178,596$2,962,908→ 403,074 total
Exercise/Conversion
Common Stock
[F1]
2026-06-16$5.80/sh+100,000$580,000→ 503,074 total
Sale
Common Stock
[F1]
2026-06-16$17.50/sh−100,000$1,750,000→ 403,074 total
Exercise/Conversion
Employee Stock Option (Right to Buy)
[F1][F4][F3]
2026-06-15−178,596→ 507,564 total
Exercise: $5.80Exp: 2027-03-17→ Common Stock (178,596 underlying)
Exercise/Conversion
Employee Stock Option (Right to Buy)
[F1][F4][F3]
2026-06-16−100,000→ 407,564 total
Exercise: $5.80Exp: 2027-03-17→ Common Stock (100,000 underlying)

Footnotes (4)

[F1]This exercise and subsequent sale were made pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on March 13, 2026.
[F2]The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $15.945 to $16.93, inclusive. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote to this Form 4.
[F3]The stock options have fully vested and are immediately exercisable.
[F4]Granted as compensation for services.

Signature

/s/ Aaron Saltz, attorney-in-fact|2026-06-17

1 file