As of the latest Form 4 filed May 13, 2026.
What MannKind Corp insiders — officers, directors and 10% owners — have bought and sold in their own stock, straight from their SEC Form 4 filings. Values are shares × the reported transaction price where both are disclosed.
Buys plotted up, sells down; bar height is the disclosed dollar value (shares × reported price). Our Form 4 history is only complete from mid-2026, so early months are sparse — the series fills in as more filings land. Open-market purchases and sales only.
Newest filing first — the 20 most recent filings for MNKD.
| Filed | Trade date | Insider | Transaction | Shares | Price | Value | 10b5-1 | Filing |
|---|---|---|---|---|---|---|---|---|
| 2026-05-13 | 2026-05-12 | Binder Steven B. Director | SSale | −16.9K | $3.29 | $55.7K | Yes (planned) | Form 4 ↗ |
| 2026-05-13 | 2026-05-12 | Thomson David EVP Genl Counsel & Secretary | SSale | −3.03K | $3.29 | $9.98K | Yes (planned) | Form 4 ↗ |
| 2026-05-13 | 2026-05-11 | Tross Stuart A Chief People & Workpl Officer | FTax | −8.07K | $3.52 | $28.4K | No | Form 4 ↗ |
| 2026-05-13 | 2026-05-11 | Binder Steven B. Director | FTax | −5.56K | $3.52 | $19.6K | Yes (planned) | Form 4 ↗ |
| 2026-05-13 | 2026-05-11 | Thomson David EVP Genl Counsel & Secretary | FTax | −12.4K | $3.52 | $43.6K | Yes (planned) | Form 4 ↗ |
| 2026-05-13 | 2026-05-11 | Castagna Michael Chief Executive Officer | FTax | −35.0K | $3.52 | $123K | No | Form 4 ↗ |
| 2026-04-24 | 2026-04-22 | Prentiss Christopher B Chief Financial Officer | FTax | −12.3K | $2.74 | $33.6K | No | Form 4 ↗ |
| 2026-01-09 | 2026-01-08 | Tross Stuart A Chief People & Workpl Officer | SSale | −47.0K | $6.33 | $298K | Yes (planned) | Form 4 ↗ |
| 2025-12-29 | 2025-12-24 | Castagna Michael Chief Executive Officer | GGift | −44.2K | $0.00 | $0.00 | No | Form 4 ↗ |
| 2025-12-19 | 2025-12-17 | Castagna Michael Chief Executive Officer | SSale | −65.8K | $6.01 | $395K | Yes (planned) | Form 4 ↗ |
| 2025-12-19 | 2025-12-17 | Castagna Michael, Chief Executive Officer | MExercise | +65.8K | $4.55 | $299K | Yes (planned) | Form 4 ↗ |
| 2025-12-16 | 2025-12-16 | Castagna Michael Chief Executive Officer | SSale | −21.3K | $6.00 | $128K | Yes (planned) | Form 4 ↗ |
| 2025-12-16 | 2025-12-16 | Castagna Michael, Chief Executive Officer | MExercise | +21.3K | $4.55 | $97.0K | Yes (planned) | Form 4 ↗ |
| 2025-12-16 | 2025-12-12 | Castagna Michael, Chief Executive Officer | SSale | −20.8K | $6.00 | $125K | Yes (planned) | Form 4 ↗ |
| 2025-12-16 | 2025-12-12 | Castagna Michael, Chief Executive Officer | MExercise | +20.8K | $4.55 | $94.7K | Yes (planned) | Form 4 ↗ |
| 2025-12-04 | 2025-12-02 | Castagna Michael Chief Executive Officer | SSale | −108K | $5.57 | $601K | Yes (planned) | Form 4 ↗ |
| 2025-12-04 | 2025-12-02 | Castagna Michael, Chief Executive Officer | MExercise | +108K | $4.55 | $491K | Yes (planned) | Form 4 ↗ |
| 2025-12-04 | 2025-12-02 | Thomson David EVP Genl Counsel & Secretary | SSale | −148K | $5.57 | $823K | Yes (planned) | Form 4 ↗ |
| 2025-12-04 | 2025-12-02 | Thomson David, EVP Genl Counsel & Secretary | MExercise | +87.8K | $4.60 | $404K | Yes (planned) | Form 4 ↗ |
| 2025-12-04 | 2025-12-02 | Thomson David, EVP Genl Counsel & Secretary | MExercise | +60.0K | $4.55 | $273K | Yes (planned) | Form 4 ↗ |
Insiders — a company’s officers, directors and holders of more than 10% of its stock — must report any trade in that stock to the SEC on a Form 4 within two business days. Each row here is one transaction from those filings.
The transaction code tells you what happened: Purchase (P) and Sale (S) are open-market trades — the ones markets watch most; Award (A) is a granted stock or unit, Option exercise (M) converts options into shares, and Gift (G) is a transfer for no consideration. Awards, exercises and gifts are largely compensation or administrative, not a directional bet.
One caveat on sales: many are made under a Rule 10b5-1 plan scheduled months in advance, so a sale is not automatically a bearish signal. Insider activity is a noisy input — read it alongside the filings, not on its own.
See also MNKD’s full analysis or the market-wide insider trading feed. The tabs above jump to MNKD’s other SEC data.
Source: SEC Form 4 filings for MNKD, parsed from EDGAR. Transaction prices are as reported in the filing — SEC public-domain data, not market quotes. Values are shares × reported price where both are disclosed; grants and gifts often carry no price. A delayed record of what insiders reported, not a live position or a recommendation.
Research and education only — not financial advice. TENKis not a registered investment adviser or broker-dealer and gives no personalized advice. Every call is impersonal — identical for all users, generated on a schedule from SEC filings plus a delayed/third-party price feed — may be wrong or out of date, and is not a recommendation to buy or sell any security. The operator and an affiliated trading operation may hold or trade the securities TENK rates; see Disclosures. Past performance does not guarantee future results. Do your own research.