Magnite, Inc. (MGNI) insider trading.
In Q3 2026, insiders at Magnite, Inc. reported 48 non-derivative transactions on 33 Forms 3, 4 and 5: 0 open-market purchases and 33 sales worth $19.1M.
- Transactions
- 48
- Purchases (P)
- 0
- Sales (S)
- 33
- Net shares, P minus S
- -834,718
- Insiders
- 12
- Last filed
- 2026-09-18
Insiders
| Insider | Relationship | Transactions | Buys | Sales |
|---|---|---|---|---|
| Buonasera David | Officer · CHIEF TECHNOLOGY OFFICER | 9 | 0 | 8 |
| Evans Katie Seitz | Officer · See Remarks | 7 | 0 | 4 |
| Buckley Sean Patrick | Officer · See Remarks | 7 | 0 | 5 |
| Barrett Michael G. | Director, Officer · CEO | 7 | 0 | 3 |
| Caine Paul | Director | 5 | 0 | 5 |
| Knopper Douglas S | Director | 2 | 0 | 2 |
| Spillane Robert F | Director | 2 | 0 | 1 |
| Saltz Aaron | Officer · CHIEF LEGAL OFFICER | 2 | 0 | 1 |
| Harden Sarah Patricia | Director | 2 | 0 | 2 |
| Day David | Officer · CHIEF FINANCIAL OFFICER | 2 | 0 | 0 |
| Gephart Brian | Officer · CHIEF ACCOUNTING OFFICER | 2 | 0 | 1 |
| Lam Rachel | Director | 1 | 0 | 1 |
Transactions
| Date | Insider | Code | Shares | Price | Owned after | Filing |
|---|---|---|---|---|---|---|
| 2026-09-17 | Knopper Douglas S | S (D) | 37,337 | $26.28 | 51,136 | Form 4 |
| 2026-09-17 | Caine Paul | S (D) | 7,500 | $26.5 | 137,401 | Form 4 |
| 2026-09-14 | Spillane Robert F | M (A) | 10,363 | $5.17 | 68,078 | Form 4 |
| 2026-09-14 | Spillane Robert F | S (D) | 10,363 | $23.76 | 57,715 | Form 4 |
| 2026-09-14 | Buonasera David | S (D) | 1,165 | $24 | 245,155 | Form 4 |
| 2026-09-11 | Evans Katie Seitz | S (D) | 13,997 | $24 | 441,800 | Form 4 |
| 2026-09-10 | Caine Paul | S (D) | 5,000 | $23.53 | 144,901 | Form 4 |
| 2026-09-10 | Saltz Aaron | S (D) | 40,000 | $23.41 | 224,389 | Form 4 |
| 2026-09-09 | Evans Katie Seitz | S (D) | 11,100 | $23.46 | 455,797 | Form 4 |
| 2026-09-08 | Evans Katie Seitz | M (A) | 13,546 | $5.16 | 499,182 | Form 4 |
| 2026-09-08 | Evans Katie Seitz | S (D) | 32,285 | $23.63 | 466,897 | Form 4 |
| 2026-09-02 | Buonasera David | S (D) | 1,043 | $25 | 246,320 | Form 4 |
| 2026-09-01 | Buonasera David | S (D) | 5,371 | $23.42 | 247,363 | Form 4 |
| 2026-08-28 | Harden Sarah Patricia | S (D) | 18,436 | $24 | 114,751 | Form 4 |
| 2026-08-26 | Harden Sarah Patricia | S (D) | 30,550 | $23.31 | 133,187 | Form 4 |
| 2026-08-18 | Buckley Sean Patrick | S (D) | 2,759 | $25 | 293,060 | Form 4 |
| 2026-08-17 | Buckley Sean Patrick | S (D) | 8,271 | $24.31 | 295,819 | Form 4 |
| 2026-08-15 | Barrett Michael G. | F (D) | 10,404 | $24.73 | 392,670 | Form 4 |
| 2026-08-15 | Day David | F (D) | 14,170 | $24.73 | 452,861 | Form 4 |
| 2026-08-15 | Evans Katie Seitz | F (D) | 11,204 | $24.73 | 485,636 | Form 4 |
| 2026-08-15 | Gephart Brian | F (D) | 3,789 | $24.73 | 102,328 | Form 4 |
| 2026-08-15 | Saltz Aaron | F (D) | 5,627 | $24.73 | 264,389 | Form 4 |
| 2026-08-15 | Buckley Sean Patrick | F (D) | 11,715 | $24.73 | 304,090 | Form 4 |
| 2026-08-15 | Buonasera David | F (D) | 8,102 | $24.73 | 252,734 | Form 4 |
| 2026-08-14 | Caine Paul | S (D) | 7,500 | $25 | 149,901 | Form 4 |
| 2026-08-13 | Day David | G (D) | 26,258 | $0 | 467,031 | Form 4 |
| 2026-08-10 | Caine Paul | S (D) | 5,000 | $24.35 | 157,401 | Form 4 |
| 2026-08-10 | Lam Rachel | S (D) | 10,000 | $24.16 | 230,620 | Form 4 |
| 2026-08-10 | Gephart Brian | S (D) | 12,479 | $24.68 | 106,117 | Form 4 |
| 2026-08-06 | Barrett Michael G. | S (D) | 293,968 | $22.72 | 403,074 | Form 4 |
| 2026-08-06 | Barrett Michael G. | M (A) | 293,968 | $5.8 | 697,042 | Form 4 |
| 2026-08-06 | Knopper Douglas S | S (D) | 37,337 | $22.72 | 88,473 | Form 4 |
| 2026-08-06 | Evans Katie Seitz | M (A) | 20,000 | $5.16 | 516,840 | Form 4 |
| 2026-08-06 | Evans Katie Seitz | S (D) | 20,000 | $24 | 496,840 | Form 4 |
| 2026-08-06 | Buckley Sean Patrick | M (A) | 28,703 | $13.9 | 382,984 | Form 4 |
| 2026-08-06 | Buckley Sean Patrick | S (D) | 19,237 | $23 | 315,805 | Form 4 |
| 2026-08-06 | Buckley Sean Patrick | S (D) | 47,942 | $25.09 | 335,042 | Form 4 |
| 2026-08-06 | Buonasera David | S (D) | 871 | $25 | 260,836 | Form 4 |
| 2026-08-06 | Buonasera David | S (D) | 4,176 | $22.81 | 264,309 | Form 4 |
| 2026-08-06 | Buonasera David | S (D) | 2,602 | $24 | 261,707 | Form 4 |
| 2026-07-15 | Barrett Michael G. | M (A) | 38,596 | $5.8 | 441,670 | Form 4 |
| 2026-07-15 | Barrett Michael G. | S (D) | 38,596 | $20.35 | 403,074 | Form 4 |
| 2026-07-10 | Caine Paul | S (D) | 5,000 | $20.64 | 162,401 | Form 4 |
| 2026-07-07 | Buckley Sean Patrick | S (D) | 19,233 | $21.03 | 354,281 | Form 4 |
| 2026-07-07 | Buonasera David | S (D) | 1,224 | $21 | 268,485 | Form 4 |
| 2026-07-01 | Buonasera David | S (D) | 9,376 | $20 | 269,709 | Form 4 |
| 2026-06-29 | Barrett Michael G. | M (A) | 75,000 | $5.8 | 478,074 | Form 4 |
| 2026-06-29 | Barrett Michael G. | S (D) | 75,000 | $19.5 | 403,074 | Form 4 |
Transaction codes in this quarter
Get MGNI insider transactions through the API
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curl "https://sec-api.dev/api/v1/insider-transactions?period=2026q3&cik=1595974&limit=100" \
-H "Authorization: Bearer $SEC_API_KEY"Insider trading API guide · MGNI company page · Magnite, Inc. on SEC.gov
Questions
Are insiders buying or selling Magnite, Inc. (MGNI)?
In Q3 2026, insiders at Magnite, Inc. reported 48 non-derivative transactions on 33 Forms 3, 4 and 5: 0 open-market purchases and 33 sales worth $19.1M. Grants, tax withholding and option exercises are counted as transactions but are not purchases or sales.
Where do these Magnite, Inc. insider trades come from?
From the SEC Insider Transactions Data Sets for Q3 2026, which republish the Forms 3, 4 and 5 filed on EDGAR. Each row links to its filing on SEC.gov.
Source: SEC Insider Transactions Data Sets, Q3 2026, retrieved 2026-10-27. Footnotes, derivative holdings and amendments are in the linked filings. Not investment advice.
Plain-text version for agents and LLMs: /insider-trading/mgni.md
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