SEC Form 4
NEW MOUNTAIN FINANCE CORPORATION (NMFC) insider trading
In the 12 months to Oct 26, 2026, one NMFC insider reported open-market sales of $611.7K across 1 filing; 4 insiders bought $12.6M.
Latest filing · Last 12 months · Source: SEC EDGAR · How we count
- Open-market sales
- $611.7K
- 1 filing · 1 insider
- Open-market purchases
- $12.6M
- 8 filings
Who traded NMFC, and when
- Purchase
- Sale
NMFC daily close from Oct 27, 2025 to Oct 26, 2026, between $6.51 and $9.79, last $6.61. 1 sale and 8 purchase filings by 5 insiders, marked at their filing dates. Steven B. Klinsky, Director: bought $12.0M across 4 filings, first filed Mar 3, 2026, last Mar 12, 2026. John P. Malfettone, Director: sold $611.7K across 1 filing, first filed Jun 16, 2026, last Jun 16, 2026. Adam B. Weinstein, EVP, CAO and Director: bought $421.9K across 2 filings, first filed Mar 3, 2026, last Mar 18, 2026. David Ogens, Director: bought $98.4K across 1 filing, first filed Mar 4, 2026, last Mar 4, 2026. Laura C. Holson Boswerger, COO: bought $96.8K across 1 filing, first filed Mar 2, 2026, last Mar 2, 2026.
Largest mark · tap a row for others
Steven B. Klinsky · Director
Filing 1 of 3 within a week · $7,958,083 total
Purchase $2,515,258
324,727 shares at $7.75 avg
Filed Mar 3, 2026 · traded Feb 27
Close on filing date $7.99
Steven B. Klinsky · Director
Director
$12.0M boughtJohn P. Malfettone · Director
Director
$611.7K soldAdam B. Weinstein · EVP, CAO and Director
EVP, CAO and Director
$421.9K boughtDavid Ogens · Director
Director
$98.4K boughtLaura C. Holson Boswerger · COO
COO
$96.8K boughtOpen-market trades
9 filings in the last 12 months| Insider | Role | Sold | Bought | Filings | Pre-arranged (10b5-1) | Last filed |
|---|---|---|---|---|---|---|
| Steven B. Klinsky | Director | — | $12.0M | 4 | — | |
| John P. Malfettone | Director | $611.7K | — | 1 | — | |
| Adam B. Weinstein | EVP, CAO and Director | — | $421.9K | 2 | — | |
| David Ogens | Director | — | $98.4K | 1 | — | |
| Laura C. Holson Boswerger | COO | — | $96.8K | 1 | — |
| Filed | Insider | Type | Shares | Avg price | Value | Held after | Source |
|---|---|---|---|---|---|---|---|
traded | John P. Malfettone Director | Sale | 77,500 | $7.89 | $611.7K | 0 | |
traded | Adam B. Weinstein EVP, CAO and Director | Purchase | 12,900 | $7.61 | $98.2K | 751,756 | |
traded | Steven B. Klinsky Director | Purchase | 500,000 | $8.05 | $4.0M | 1,465,110 | |
traded | Steven B. Klinsky Director | Purchase | 237,873 | $8.10 | $1.9M | 5,037,524 | |
traded | Steven B. Klinsky Director | Purchase | 437,400 | $8.04 | $3.5M | 1,219,153 | |
traded | David Ogens Director | Purchase | 12,500 | $7.87 | $98.4K | 239,156 | |
traded | Adam B. Weinstein EVP, CAO and Director | Purchase | 41,707 | $7.76 | $323.7K | 738,856 | |
traded | Steven B. Klinsky Director | Purchase | 324,727 | $7.75 | $2.5M | 1,073,354 | |
traded | Laura C. Holson Boswerger COO | Purchase | 12,500 | $7.74 | $96.8K | 81,030 |
GET /stocks/filings/vX/form-4?tickers=NMFC&filing_date.gte=2025-10-26&sort=filing_date.desc&limit=500{
"status": "OK",
"results": [
{
"tickers": [
"NMFC",
"NMFCZ"
],
"issuer_cik": "0001496099",
"owner_cik": "0001794312",
"accession_number": "0001580642-26-003787",
"form_type": "4",
"filing_date": "2026-06-16",
"period_of_report": "2026-06-15",
"issuer_name": "New Mountain Finance Corp",
"issuer_trading_symbol": "NMFC",
"owner_name": "Malfettone John P",
"is_director": true,
"is_officer": false,
"is_ten_percent_owner": false,
"is_other": false,
"security_type": "non_derivative",
"record_type": "transaction",
"security_title": "Common Stock",
"transaction_timeliness": "O",
"aff_10b5_one": false,
"transaction_date": "2026-06-15",
"transaction_code": "S",
"equity_swap_involved": false,
"transaction_shares": 77500,
"transaction_price_per_share": 7.8927,
"transaction_acquired_disposed": "D",
"shares_owned_following_transaction": 0,
"transaction_value": 611684.25,
"not_subject_to_section_16": false,
"direct_or_indirect": "D"
},
{
"tickers": [
"NMFC",
"NMFCZ"
],
"issuer_cik": "0001496099",
"owner_cik": "0001515170",
"accession_number": "0001580642-26-001895",
"form_type": "4",
"filing_date": "2026-03-18",
"period_of_report": "2026-03-17",
"issuer_name": "New Mountain Finance Corp",
"issuer_trading_symbol": "NMFC",
"owner_name": "Weinstein Adam B.",
"is_director": true,
"is_officer": true,
"is_ten_percent_owner": false,
"is_other": false,
"officer_title": "EVP, CAO and Director",
"security_type": "non_derivative",
"record_type": "transaction",
"security_title": "Common Stock",
"transaction_timeliness": "O",
"aff_10b5_one": false,
"transaction_date": "2026-03-17",
"transaction_code": "P",
"equity_swap_involved": false,
"transaction_shares": 12900,
"transaction_price_per_share": 7.609,
"transaction_acquired_disposed": "A",
"shares_owned_following_transaction": 751756.32,
"transaction_value": 98156.1,
"not_subject_to_section_16": false,
"direct_or_indirect": "D"
}
]
}
// trimmed to 2 resultsThe response includes every Form 4 record; this page keeps open-market purchases and sales on common stock and removes duplicate joint-filer rows.
Other insider activity (not market trades) · 1 record
- Other1 record
Reported on Form 4 but not purchases or sales in the market, so not counted in the totals above.
How to read this page
- Open-market purchase or sale
- A buy or sell of the company's stock at market price. Grants, option exercises, shares withheld for tax, gifts and employee stock plan purchases are listed separately and not counted.
- Filing date
- Insiders have two business days to report a trade. Totals and the chart use the filing date, when the trade became public.
Frequently asked questions
Has NEW MOUNTAIN FINANCE CORPORATION's CEO sold stock?
No. John R. Kline (CEO) made no open-market sales filed as CEO in the last 12 months.
How current is NMFC’s insider data?
These are NMFC Form 4 filings from the last year, refreshed daily. The Massive Form 4 API has the full, continuously updated record.
What counts as an open-market buy or sell?
Only purchases and sales at the market price. Option exercises, grants, gifts, and shares withheld for taxes are reported on Form 4 but are left out of the buy and sell totals.
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Track NMFC insider trades with your agent
This page joins two Massive endpoints: Form 4 filings and daily prices. Ask an agent to watch for new filings:
Using the Massive API (massive.com/docs/llms.txt), check Form 4 filings for NMFC every day with transaction_code=P and tell me when an insider files an open-market purchase, with their role, shares, price and the filing link.
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