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TECX · Tectonic Therapeutic, Inc.

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$36.05 -0.99 (-2.67%) At close · Aug 20
Market Cap
$699.09M
Shares
19.55M

Institutional ownership from SEC Form 13F filings. Investment managers with more than $100 million in U.S. equities must disclose their positions every quarter, within 45 days of quarter-end, so the holdings shown can lag the market by up to a quarter.

Holders: 123
Total Value: $487,144,035
Total Shares: 14,169,404

Institutional Ownership Trend

9 quarters

Holder Concentration

Across 123 13F filers · Δ vs Mar 31, 2026
Top Holder
20.0%
Jun 2024 → Jun 2026 · range 17.0% – 24.9%
+0.2 pts
Top 5
48.3%
Jun 2024 → Jun 2026 · range 45.0% – 64.9%
+0.0 pts
Top 10
67.5%
Jun 2024 → Jun 2026 · range 60.9% – 86.3%
+0.5 pts
HHI
715
Jun 2024 → Jun 2026 · range 681 – 1,075
Broadly held+6

Quarterly Activity

vs Mar 31, 2026
New
23
Increased
40
Decreased
41
Sold Out
13
Unchanged
19
Holder count: +10
Institutional value: +10.7%
Shares held: -0.5%

Top Buyers

vs Mar 31, 2026
Institution Added Now Holds Open

Top Sellers

vs Mar 31, 2026
Institution Sold Now Holds Open

Top New Positions

vs Mar 31, 2026
Institution Acquired Value (USD) Open

Top Sold-Out Positions

vs Mar 31, 2026
Institution Previously Held Last Value (USD) Open
Showing 100 of 125
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Holder Value (USD) % of 13F Shares Open
Key facts CIK 1681087 CUSIP 878972108 13F (30d) 118 filings 118 filers Visit website Investor relations