NMFC insider buying and SEC filings, explained
New Mountain Finance Corp · CIK 1496099
Tracked: Forms 3/4/5, 8-K, NT · All filings on sec.gov
Company profile
- Exchanges
- Nasdaq, Nasdaq
- State of incorporation
- X1
- Fiscal year end
- Dec 31
- Former names
- New Mountain Guardian Corp
Insider activity in the last 12 months
Bought
$12.6M
Insiders who bought
4
Sold (not marked 10b5-1)
$611K
Planned sales (10b5-1)
$0
Insider purchases and sales, last 12 months
| Traded | Type | What was filed | Source |
|---|---|---|---|
| Jun 15, 2026 | Sale | John P Malfettone (Director) sold 77,500 shares at $7.89 ($611K). Holdings down 100% to 0 shares. Not marked as a 10b5-1 plan trade. | SEC filing Filed Jun 16, 2026 |
| Mar 17, 2026 | Purchase (code P) | Adam B. Weinstein (EVP, CAO and Director and Director) bought 12,900 shares at $7.61 ($98K), reported as a purchase (code P). Holdings up 2% to 751,756 shares. Not marked as a 10b5-1 plan trade. | SEC filing Filed Mar 18, 2026 |
| Mar 10–11, 2026 | Purchase (code P) | Steven B. Klinsky (Director and 10% owner) bought 500,000 shares indirectly between Mar 10 and Mar 11 at $8.05 ($4.0M), reported as a purchase (code P). Indirect holdings up 10% to 5,370,858 shares. Not marked as a 10b5-1 plan trade. | SEC filing Filed Mar 12, 2026 |
| Mar 5, 2026 | Purchase (code P) | Steven B. Klinsky (Director and 10% owner) bought 237,873 shares indirectly at $8.10 ($1.9M), reported as a purchase (code P). Indirect holdings up 5% to 5,037,524 shares. Not marked as a 10b5-1 plan trade. | SEC filing Filed Mar 6, 2026 |
| Mar 3–4, 2026 | Purchase (code P) | Steven B. Klinsky (Director and 10% owner) bought 437,400 shares indirectly between Mar 3 and Mar 4 at about $8.04 ($3.5M), reported as a purchase (code P). Indirect holdings up 10% to 4,878,942 shares. Not marked as a 10b5-1 plan trade. | SEC filing Filed Mar 5, 2026 |
| Mar 3, 2026 | Purchase (code P) | David Ogens (Director) bought 12,500 shares at about $7.87 ($98K), reported as a purchase (code P). Holdings up 5% to 241,556 shares. Not marked as a 10b5-1 plan trade. | SEC filing Filed Mar 4, 2026 |
| Feb 27–Mar 2, 2026 | Purchase (code P) | Steven B. Klinsky (Director) bought 324,727 shares indirectly between Feb 27 and Mar 2 at about $7.75 ($2.5M), reported as a purchase (code P). Indirect holdings up 8% to 4,587,341 shares. Not marked as a 10b5-1 plan trade. | SEC filing Filed Mar 3, 2026 |
| Feb 27–Mar 2, 2026 | Purchase (code P) | Adam B. Weinstein (EVP, CAO and Director and Director) bought 41,707 shares between Feb 27 and Mar 2 at about $7.76 ($324K), reported as a purchase (code P). Holdings up 6% to 738,856 shares. Not marked as a 10b5-1 plan trade. | SEC filing Filed Mar 3, 2026 |
| Feb 27, 2026 | Purchase (code P) | Laura C. Holson Boswerger (President / COO) bought 12,500 shares at $7.74 ($97K), reported as a purchase (code P). Holdings up 18% to 81,030 shares. Not marked as a 10b5-1 plan trade. | SEC filing Filed Mar 2, 2026 |
1 routine transaction (such as a grant, option exercise or tax withholding) is not listed.
Cluster buys
4 insiders bought in 30 days
$12.6M in purchases since Feb 27, 2026 · Purchases traded Feb 27, 2026 to Mar 17, 2026 · Closed
| Insider | Value | Traded | Source |
|---|---|---|---|
| Laura C. Holson Boswerger (President / COO) | $97K | Feb 27, 2026 | SEC filing |
| Adam B. Weinstein (EVP, CAO and Director) | $324K | Mar 2, 2026 | SEC filing |
| Steven B. Klinsky (Director) | $2.5M | Mar 2, 2026 | SEC filing |
| David Ogens (Director) | $98K | Mar 3, 2026 | SEC filing |
| Steven B. Klinsky (Director) | $3.5M | Mar 4, 2026 | SEC filing |
| Steven B. Klinsky (Director) | $1.9M | Mar 5, 2026 | SEC filing |
| Steven B. Klinsky (Director) | $4.0M | Mar 11, 2026 | SEC filing |
| Adam B. Weinstein (EVP, CAO and Director) | $98K | Mar 17, 2026 | SEC filing |
Red flags
No red flags in the last 12 months.
Key events
No key events in the last 12 months.
8-K filings, last 12 months
| Filed | Items | Tag | Source |
|---|---|---|---|
| Nov 2, 2026, 4:40 PM ET 8-K | Earnings released (Item 2.02) Reg FD disclosure (Item 7.01) | SEC filing |
Red flags are objective triggers only: the item or form filed, never an opinion.
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