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ANAB · Anaptysbio, Inc

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$57.74 +1.05 (+1.85%) At close · Aug 21
Market Cap
$1.65B
Shares
29.10M

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: 213
Total Value: $2,040,606,474
Total Shares: 30,231,217

Institutional Ownership Trend

26 quarters

Holder Concentration

Across 213 13F filers · Δ vs Mar 31, 2026
Top Holder
26.1%
Sep 2023 → Jun 2026 · range 19.5% – 27.9%
−1.8 pts
Top 5
43.8%
Sep 2023 → Jun 2026 · range 43.6% – 52.8%
−1.7 pts
Top 10
56.5%
Sep 2023 → Jun 2026 · range 56.5% – 70.1%
−2.7 pts
HHI
844
Sep 2023 → Jun 2026 · range 657 – 942
Broadly held−99

Quarterly Activity

vs Mar 31, 2026
New
46
Increased
24
Decreased
143
Sold Out
40
Unchanged
0
Holder count: +6
Institutional value: +30.2%
Shares held: +7.0%

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 217
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Holder Value (USD) % of 13F Shares Open
Key facts CIK 1370053 CUSIP 032724106 13F (30d) 201 filings 198 filers Visit website Investor relations