SEC Form 4
Tectonic Therapeutic, Inc. (TECX) insider trading
In the 12 months to Oct 26, 2026, 2 TECX insiders reported open-market sales of $651.0K across 9 filings; 2 insiders bought $182.4K.
Latest filing · Last 12 months · Source: SEC EDGAR · How we count
- Open-market sales
- $651.0K
- 9 filings · 2 insiders
- Open-market purchases
- $182.4K
- 2 filings
- Pre-arranged sales (10b5-1)
- 9 of 9
- All $651.0K sold was pre-arranged
Who traded TECX, and when
- Purchase
- Sale
- Sale, pre-arranged (10b5-1)
TECX daily close from Oct 27, 2025 to Oct 26, 2026, between $16.44 and $37.93, last $20.11. 9 sale and 2 purchase filings by 4 insiders, marked at their filing dates. Marcella K. Ruddy, Chief Medical Officer: sold $363.0K across 3 filings, first filed Mar 9, 2026, last May 6, 2026. Peter McNamara, Chief Scientific Officer: sold $288.0K across 6 filings, first filed Mar 5, 2026, last Oct 2, 2026. Daniel Lochner, Chief Financial Officer: bought $129.7K across 1 filing, first filed Feb 11, 2026, last Feb 11, 2026. Alise Reicin, Chief Executive Officer: bought $52.8K across 1 filing, first filed Mar 5, 2026, last Mar 5, 2026.
Largest mark · tap a row for others
Marcella K. Ruddy · Chief Medical Officer
Sale $300,000
10,000 shares at $30.00 avg
Filed Mar 9, 2026 · traded Mar 6
Pre-arranged (10b5-1) · close on filing date $34.00
Marcella K. Ruddy · Chief Medical Officer
Chief Medical Officer
$363.0K soldPeter McNamara · Chief Scientific Officer
Chief Scientific Officer
$288.0K soldDaniel Lochner · Chief Financial Officer
Chief Financial Officer
$129.7K boughtAlise Reicin · Chief Executive Officer
Chief Executive Officer
$52.8K boughtOpen-market trades
11 filings in the last 12 months| Insider | Role | Sold | Bought | Filings | Pre-arranged (10b5-1) | Last filed |
|---|---|---|---|---|---|---|
| Marcella K. Ruddy | Chief Medical Officer | $363.0K | — | 3 | 100% of sales | |
| Peter McNamara | Chief Scientific Officer | $288.0K | — | 6 | 100% of sales | |
| Daniel Lochner | Chief Financial Officer | — | $129.7K | 1 | — | |
| Alise Reicin | Chief Executive Officer | — | $52.8K | 1 | — |
| Filed | Insider | Type | Shares | Avg price | Value | Held after | Source |
|---|---|---|---|---|---|---|---|
traded | Peter McNamara Chief Scientific Officer | SalePre-arranged (10b5-1) | 536 | $23.04 | $12.3K | 54,305 | |
traded | Peter McNamara Chief Scientific Officer | SalePre-arranged (10b5-1) | 43 | $36.52 | $1.6K | 55,285 | |
traded | Peter McNamara Chief Scientific Officer | SalePre-arranged (10b5-1) | 43 | $35.00 | $1.5K | 55,285 | |
traded | Peter McNamara Chief Scientific Officer | SalePre-arranged (10b5-1) | 172 | $35.00 | $6.0K | 55,285 | |
traded | Marcella K. Ruddy Chief Medical Officer | SalePre-arranged (10b5-1) | 1,065 | $30.00 | $32.0K | 67,682 | |
traded | Marcella K. Ruddy Chief Medical Officer | SalePre-arranged (10b5-1) | 1,000 | $31.05 | $31.1K | 68,747 | |
traded | Peter McNamara Chief Scientific Officer | SalePre-arranged (10b5-1) | 6,262 | $30.17 | $188.9K | 55,500 | |
traded | Marcella K. Ruddy Chief Medical Officer | SalePre-arranged (10b5-1) | 10,000 | $30.00 | $300.0K | 69,747 | |
traded | Alise Reicin Chief Executive Officer | Purchase | 2,500 | $21.10 | $52.8K | 127,030 | |
traded | Peter McNamara Chief Scientific Officer | SalePre-arranged (10b5-1) | 3,299 | $23.53 | $77.6K | 58,832 | |
traded | Daniel Lochner Chief Financial Officer | Purchase | 6,000 | $21.61 | $129.7K | 32,044 |
GET /stocks/filings/vX/form-4?tickers=TECX&filing_date.gte=2025-10-26&sort=filing_date.desc&limit=500{
"status": "OK",
"results": [
{
"tickers": [
"TECX"
],
"issuer_cik": "0001681087",
"owner_cik": "0002023255",
"accession_number": "0002023255-26-000012",
"form_type": "4",
"filing_date": "2026-10-02",
"period_of_report": "2026-09-25",
"issuer_name": "Tectonic Therapeutic, Inc.",
"issuer_trading_symbol": "TECX",
"owner_name": "McNamara Peter",
"is_director": false,
"is_officer": true,
"is_ten_percent_owner": false,
"is_other": false,
"officer_title": "Chief Scientific Officer",
"security_type": "non_derivative",
"record_type": "transaction",
"security_title": "Common Stock",
"transaction_timeliness": "O",
"aff_10b5_one": true,
"transaction_date": "2026-09-30",
"transaction_code": "S",
"equity_swap_involved": false,
"transaction_shares": 536,
"transaction_price_per_share": 23.04,
"transaction_acquired_disposed": "D",
"shares_owned_following_transaction": 54305,
"transaction_value": 12349.439999999999,
"direct_or_indirect": "D",
"footnotes": [
{
"id": "F2",
"description": "This sale was made pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on November 14, 2025."
},
{
"id": "F3",
"description": "The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $22.61 to $23.32, inclusive. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote."
}
]
},
{
"tickers": [
"TECX"
],
"issuer_cik": "0001681087",
"owner_cik": "0002023255",
"accession_number": "0002023255-26-000009",
"form_type": "4",
"filing_date": "2026-08-26",
"period_of_report": "2026-08-25",
"issuer_name": "Tectonic Therapeutic, Inc.",
"issuer_trading_symbol": "TECX",
"owner_name": "McNamara Peter",
"is_director": false,
"is_officer": true,
"is_ten_percent_owner": false,
"is_other": false,
"officer_title": "Chief Scientific Officer",
"security_type": "non_derivative",
"record_type": "transaction",
"security_title": "Common Stock",
"transaction_timeliness": "O",
"aff_10b5_one": true,
"transaction_date": "2026-08-25",
"transaction_code": "S",
"equity_swap_involved": false,
"transaction_shares": 43,
"transaction_price_per_share": 36.52,
"transaction_acquired_disposed": "D",
"shares_owned_following_transaction": 55285,
"transaction_value": 1570.3600000000001,
"direct_or_indirect": "D",
"footnotes": [
{
"id": "F1",
"description": "This exercise and subsequent sale was made pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on November 14, 2025."
}
]
}
]
}
// 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) · 24 records
- Option exercises8 records
- Tax withholding11 records
- Grants and awards5 records
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.
- Pre-arranged (10b5-1)
- The insider marked the filing as made under a trading plan set up in advance (SEC Rule 10b5-1). The mark covers the whole filing, and an unmarked filing may still be under a plan.
- Filing date
- Insiders have two business days to report a trade. Totals and the chart use the filing date, when the trade became public.
- Counted once
- When several owners (a fund and its partners, say) report the same trade, it's counted once. Corrected filings replace the originals.
Frequently asked questions
Has Tectonic Therapeutic, Inc.'s CEO sold stock?
No. Alise Reicin (CEO) made no open-market sales filed as CEO in the last 12 months.
How current is TECX’s insider data?
These are TECX 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.
Build with AI
Track TECX 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 TECX 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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