IRON SEC Filing News — Disc Medicine, Inc.

Latest SEC filings for Disc Medicine, Inc. (IRON) explained in plain English. Covers insider buying and selling (Form 4), proposed insider sales (Form 144), material company events (8-K), and quarterly & annual reports (10-Q / 10-K). StrongBuyAnalytics provides navigation and brief excerpts or summaries; original filings remain at the SEC/source links and were authored by their filers, not StrongBuyAnalytics. Filing dates shown are source dates. Coverage and detection can be delayed or incomplete because of SEC availability, amendments, parsing, caching, or outages. Latest source filing date shown: 2026-09-16.

Disc Medicine, Inc., together with its subsidiaries, a clinical-stage biopharmaceutical company, engages in the discovery, development, and commercialization of novel treatments for patients suffering from serious hematologic diseases in the United States. The company has assembled a portfolio of clinical and preclinical product candidates that aim to modify fundamental biological pathways associated with the formation and function of red blood cells, primarily heme biosynthesis and iron homeost…
Sector: Healthcare Industry: Biotechnology Market Cap: $3.0B
12
Total Filings
0
Bullish Classifications
3
Bearish Classifications
4
Insider Transactions
1
Material Events (8-K)
0
Periodic Reports
Rule-based classifications for IRON currently lean bearish. Of the 12 filing records displayed, 3 carry bearish classifications (such as insider sales or negative 8-K disclosures) versus 0 bullish. This does not necessarily signal fundamental deterioration — insiders sell for many reasons — but it is worth monitoring alongside the company's core financial metrics.
IRON Filing Activity Snapshot 2026-09-03 — 2026-09-16
Insider Transactions (Form 4)
0 buys vs 3 sells
Net insider selling in this period — insiders sell for many reasons beyond conviction.
Largest Form 144 Filing
$4.37M
Bitterman Kevin (Director) · 2026-09-03
54,496 shares · Form 4
Form 144 Notices
7
Proposed insider sales filed — Form 144 is a notice of intent, not a confirmed transaction. Actual sales are confirmed via Form 4.
Insider Transactions 4 · Forms 3, 4 and 5

A Form 4 is filed within two business days of a company insider — an officer, a director, or a holder of more than ten percent of the stock — changing their position in the shares. All 4 filings in this group are Form 4s for Disc Medicine, Inc.

The difficulty with reading these filings as a group is that a single form type covers transactions that mean entirely different things. An executive spending their own money to buy stock and an executive having shares withheld to pay tax on a vesting grant both appear as a Form 4. Every filing below is therefore tagged with the nature of the underlying transaction, taken from the transaction code reported on the form itself.

Across the 4 insider filings shown, the breakdown is 3 open-market sale and 1 option exercise. 3 of them involved a discretionary open-market trade; the rest are compensation and administrative mechanics.

What each transaction type means

Open-market sale ×3
The insider sold shares on the open market. Sales may be discretionary or executed automatically under a pre-arranged Rule 10b5-1 trading plan, and a Form 4 does not always make clear which applies.
Option exercise ×1
The insider converted options into shares. The exercise price was fixed when the options were granted, so the timing usually tracks an expiry schedule.
Form 4 Option exercise Tax / Compensation Filing 2026-09-16

IRON insider Form 4 filed for equity award, exercise, or tax withholding

Quisel John D (Director, Chief Executive Officer) filed a Form 4 covering compensation-related activity such as stock awards, option exercises, conversions, or tax withholding. These filings are usually neutral.

The insider converted options into shares. The exercise price was fixed when the options were granted, so the timing usually tracks an expiry schedule.

Transactions reported on this filing
Code Nature Shares Price Value
M Option exercise 36,000 $1.01 $36.4K
M Option exercise derivative · Stock Option (Right to Buy) 36,000 — —
Filing: Form 4 (Insider Transaction) Insider: Quisel John D (Director, Chief Executive Officer) Shares: 36,000
View on SEC EDGAR → Open Filing Document →
Form 4 Open-market sale Insider Selling 2026-09-15

IRON insider Bitterman Kevin (Director) sold 27,136 shares (~$1.90M)

Bitterman Kevin, listed as Director at Disc Medicine, Inc., reported an open-market sale of 27,136 IRON shares in a Form 4 filing. This is a confirmed insider sale, not just a proposed sale notice.

The insider sold shares on the open market. Sales may be discretionary or executed automatically under a pre-arranged Rule 10b5-1 trading plan, and a Form 4 does not always make clear which applies.

Transactions reported on this filing
Code Nature Shares Price Value
M Option exercise 7,136 $45.69 $326.0K
M Option exercise 10,000 $38.85 $388.5K
M Option exercise 10,000 $50.86 $508.6K
S Open-market sale 27,136 $70.11 $1.90M
M Option exercise derivative · Stock Option (Right to Buy) 7,136 — —
M Option exercise derivative · Stock Option (Right to Buy) 10,000 — —
M Option exercise derivative · Stock Option (Right to Buy) 10,000 — —
Filing: Form 4 (Insider Transaction) Insider: Bitterman Kevin (Director) Shares: 27,136 Est. Value: $1.90M
View on SEC EDGAR → Open Filing Document →
Form 4 Open-market sale Insider Selling 2026-09-09

IRON insider Bitterman Kevin (Director) sold 1,689 shares (~$135.1K)

Bitterman Kevin, listed as Director at Disc Medicine, Inc., reported an open-market sale of 1,689 IRON shares in a Form 4 filing. This is a confirmed insider sale, not just a proposed sale notice.

The insider sold shares on the open market. Sales may be discretionary or executed automatically under a pre-arranged Rule 10b5-1 trading plan, and a Form 4 does not always make clear which applies.

Transactions reported on this filing
Code Nature Shares Price Value
S Open-market sale 912 $79.96 $72.9K
S Open-market sale 759 $79.96 $60.7K
S Open-market sale 18 $79.96 $1.4K
Filing: Form 4 (Insider Transaction) Insider: Bitterman Kevin (Director) Shares: 1,689 Est. Value: $135.1K
View on SEC EDGAR → Open Filing Document →
Form 4 Open-market sale Insider Selling 2026-09-03

IRON insider Bitterman Kevin (Director) sold 54,496 shares (~$4.37M)

Bitterman Kevin, listed as Director at Disc Medicine, Inc., reported an open-market sale of 54,496 IRON shares in a Form 4 filing. This is a confirmed insider sale, not just a proposed sale notice.

The insider sold shares on the open market. Sales may be discretionary or executed automatically under a pre-arranged Rule 10b5-1 trading plan, and a Form 4 does not always make clear which applies.

Transactions reported on this filing
Code Nature Shares Price Value
S Open-market sale 70 $79.95 $5.6K
S Open-market sale 58 $79.95 $4.6K
S Open-market sale 1 $79.95 $79.95
S Open-market sale 26,542 $80.17 $2.13M
S Open-market sale 22,090 $80.17 $1.77M
S Open-market sale 511 $80.17 $41.0K
S Open-market sale 10 $80.98 $809.80
S Open-market sale 9 $80.98 $728.82
S Open-market sale 2 $80.98 $161.96
S Open-market sale 2,810 $79.98 $224.7K
S Open-market sale 2,339 $79.98 $187.1K
S Open-market sale 54 $79.98 $4.3K
Filing: Form 4 (Insider Transaction) Insider: Bitterman Kevin (Director) Shares: 54,496 Est. Value: $4.37M
View on SEC EDGAR → Open Filing Document →
Proposed Insider Sales 7 · Form 144

A Form 144 is a notice of intent to sell restricted or control securities. It is not a record that anything was sold. Disc Medicine, Inc. has 7 such notices in this period.

The distinction matters because a Form 144 is frequently reported as though it were a completed insider sale. The filer may sell all of the shares covered, some of them, or none at all, and there is no obligation to update the notice either way. A sale that is actually executed by an officer or director shows up separately on a Form 4, which is the filing to check before treating a proposed sale as a real one.

Form 144 Proposed Insider Sale 2026-09-11

IRON Form 144 filed for proposed insider sale by KEVIN J BITTERMAN (27,136 shares) ~$1.90M

KEVIN J BITTERMAN filed a Form 144 with the SEC indicating intent to sell IRON (Disc Medicine, Inc.) shares. Form 144 reflects a proposed sale, not a completed transaction. The actual execution, if any, would typically appear later in a Form 4.

Filing: Form 144 (Proposed Sale Notice) Insider: KEVIN J BITTERMAN Shares: 27,136 Est. Value: $1.90M
View on SEC EDGAR → Open Filing Document →
Form 144 Proposed Insider Sale 2026-09-04

IRON Form 144 filed for proposed insider sale by Atlas Venture Fund XII, LP (18 shares) ~$1.4K

Atlas Venture Fund XII, LP filed a Form 144 with the SEC indicating intent to sell IRON (Disc Medicine, Inc.) shares. Form 144 reflects a proposed sale, not a completed transaction. The actual execution, if any, would typically appear later in a Form 4.

Filing: Form 144 (Proposed Sale Notice) Insider: Atlas Venture Fund XII, LP Shares: 18 Est. Value: $1.4K
View on SEC EDGAR → Open Filing Document →
Form 144 Proposed Insider Sale 2026-09-04

IRON Form 144 filed for proposed insider sale by Atlas Venture Opportunity Fund II, LP (759 shares) ~$60.2K

Atlas Venture Opportunity Fund II, LP filed a Form 144 with the SEC indicating intent to sell IRON (Disc Medicine, Inc.) shares. Form 144 reflects a proposed sale, not a completed transaction. The actual execution, if any, would typically appear later in a Form 4.

Filing: Form 144 (Proposed Sale Notice) Insider: Atlas Venture Opportunity Fund II, LP Shares: 759 Est. Value: $60.2K
View on SEC EDGAR → Open Filing Document →
Form 144 Proposed Insider Sale 2026-09-04

IRON Form 144 filed for proposed insider sale by Atlas Venture Opportunity Fund I, LP (912 shares) ~$72.4K

Atlas Venture Opportunity Fund I, LP filed a Form 144 with the SEC indicating intent to sell IRON (Disc Medicine, Inc.) shares. Form 144 reflects a proposed sale, not a completed transaction. The actual execution, if any, would typically appear later in a Form 4.

Filing: Form 144 (Proposed Sale Notice) Insider: Atlas Venture Opportunity Fund I, LP Shares: 912 Est. Value: $72.4K
View on SEC EDGAR → Open Filing Document →
Form 144 Proposed Insider Sale 2026-09-04

IRON Form 144 filed for proposed insider sale by Atlas Venture Fund X, LP (2,212 shares) ~$175.6K

Atlas Venture Fund X, LP filed a Form 144 with the SEC indicating intent to sell IRON (Disc Medicine, Inc.) shares. Form 144 reflects a proposed sale, not a completed transaction. The actual execution, if any, would typically appear later in a Form 4.

Filing: Form 144 (Proposed Sale Notice) Insider: Atlas Venture Fund X, LP Shares: 2,212 Est. Value: $175.6K
View on SEC EDGAR → Open Filing Document →
Form 144 Proposed Insider Sale 2026-09-03

IRON Form 144 filed for proposed insider sale by Atlas Venture Fund XII, LP (54 shares) ~$4.3K

Atlas Venture Fund XII, LP filed a Form 144 with the SEC indicating intent to sell IRON (Disc Medicine, Inc.) shares. Form 144 reflects a proposed sale, not a completed transaction. The actual execution, if any, would typically appear later in a Form 4.

Filing: Form 144 (Proposed Sale Notice) Insider: Atlas Venture Fund XII, LP Shares: 54 Est. Value: $4.3K
View on SEC EDGAR → Open Filing Document →
Form 144 Proposed Insider Sale 2026-09-03

IRON Form 144 filed for proposed insider sale by Atlas Venture Opportunity Fund II, LP (2,339 shares) ~$187.2K

Atlas Venture Opportunity Fund II, LP filed a Form 144 with the SEC indicating intent to sell IRON (Disc Medicine, Inc.) shares. Form 144 reflects a proposed sale, not a completed transaction. The actual execution, if any, would typically appear later in a Form 4.

Filing: Form 144 (Proposed Sale Notice) Insider: Atlas Venture Opportunity Fund II, LP Shares: 2,339 Est. Value: $187.2K
View on SEC EDGAR → Open Filing Document →
Material Events 1 · Form 8-K

An 8-K reports a material event in the window between scheduled reports. There is 1 in this period for Disc Medicine, Inc. Each 8-K names the item number it is filed under, and that number is the fastest way to tell a routine disclosure from a consequential one.

Item 2.02 is an earnings release, Item 5.02 is a change of directors or officers, and Item 1.01 or 2.01 covers a material agreement or a completed acquisition. Item 7.01 and Item 8.01 are the general-purpose disclosure items and carry no fixed meaning on their own.

Form 8-K Material Company Update 2026-09-10

IRON filed 8-K — material company event

Disc Medicine, Inc. filed an 8-K with the SEC reporting a material event. Summary unavailable — view the original SEC filing for the full text.

Filing: 8-K (Material Event)
View on SEC EDGAR → Open Filing Document →

How we classify Disc Medicine, Inc.'s filings

Straight from EDGAR

Each displayed record links to an original source document. StrongBuyAnalytics provides navigation and brief excerpts or summaries, not the filing itself. Parsing may omit context or contain errors, so read the original document in full.

Transaction codes, not guesswork

The nature shown on each insider filing comes from the transaction code the filer entered on the form itself — P for an open-market purchase, A for a compensation award, F for shares withheld to pay tax, M for an option exercise. Where one filing contains several codes, the transaction table lists them line by line.

Why the distinction matters

Insider activity is routinely summarised as buying or selling, which flattens together decisions that mean very different things. Shares withheld for tax on a vesting grant are an automatic administrative step; shares bought on the open market are someone committing their own money at the current price.

What this page does not tell you

A filing records what happened, not why. Form 4 does not always disclose whether a sale was executed under a pre-arranged Rule 10b5-1 plan, and no single filing is a basis for a decision on IRON. Read these alongside the fundamentals rather than in isolation.

Frequently Asked Questions — IRON SEC Filings

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Publisher, sources & limitations — September 15, 2026. StrongBuyAnalytics provides navigation and brief excerpts or summaries for educational use. Original filings remain at SEC EDGAR or other displayed source links; StrongBuyAnalytics does not author them. Filing dates are source dates, not publication dates for this page. Coverage can be delayed, incomplete, amended, or unavailable because of SEC/source availability, parsing, caching, or outages. Verify every material statement in the original filing.
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