ADAR1 Capital Management, LLC KROS — KEROS THERAPEUTICS INC

Ownership history in ADAR1 Capital Management, LLC  ·  10 quarters on record

AI Ownership Summary

ADAR1 Capital Management, LLC reported KEROS THERAPEUTICS INC (KROS) in 10 quarterly 13F filings from 2023 Q4 through 2025 Q4. Peak portfolio weight reached 11.03% in 2025 Q2. The latest visible filing shows KROS at 0.03% of the fund.

This page tracks quarterly shares, estimated market value, portfolio weight, filing dates, and disclosure-aligned stock prices directly from SEC EDGAR 13F filings.

What this KROS ownership page tells you

This page is designed to answer the real investor question behind a 13F filing: how meaningful was ADAR1 Capital Management, LLC's position in KEROS THERAPEUTICS INC, and how did that conviction change over time? You can read the holding window, peak weight, latest reported size, disclosure timing, and quarter-by-quarter changes without piecing the story together from raw SEC rows.

Freshest filing
Latest Reported Filing
2025 Q4

KROS was reported at 0.03% of portfolio in the most recent visible filing.

High-water mark
Peak Conviction
11.03% in 2025 Q2

Peak weight helps separate a token disclosure from a real conviction holding the fund genuinely cared about.

Time in book
Holding Window
2023 Q4 to 2025 Q4

Longer holding windows often tell a very different story from short-lived tactical trades or one-quarter experiments.

Decision context
Why It Matters
Position size beats headlines

Knowing that a fund owned a stock is useful. Knowing whether it was a 0.20% placeholder or a true high-conviction position is where the signal actually starts.

KROS stock page ADAR1 Capital Management, LLC fund profile ADAR1 Capital Management, LLC full holdings
How ADAR1 Capital Management, LLC held KROS — position size vs. price
% of Fund (quarterly)    KROS price (quarter-end, indexed to 100)    SPY (indexed to 100)    QQQ (indexed to 100)
📋 Quarterly Holdings History 10 quarters  ▾
Quarter Action Sold % After 3M Timing Shares Change Chg % % of Fund Mkt Value Filed Price (Filed)
2025 Q4 REDUCED 99.7% -45.8% ✅ 18,851 -5,370,413 -99.7% 0.03% $384K 2026-02-14 (Est.) $16.58
2025 Q3 UNCHANGED — — — 5,389,264 — 0% 8.01% $85.3M 2025-11-14 $17.26
2025 Q2 ADDED — — — 5,389,264 +3,902,803 +262.6% 11.03% $71.9M 2025-08-14 $14.42
2025 Q1 ADDED — — — 1,486,461 +1,463,215 +6294.5% 2.81% $15.1M 2025-05-15 $14.03
2024 Q4 ADDED — — — 23,246 +22,946 +7648.7% 0.07% $368K 2025-02-13 $10.15
2024 Q3 REDUCED 99.9% -73.1% ✅ 300 -444,768 -99.9% 0.00% $17K 2024-11-14 $60.35
2024 Q3 REDUCED 18.9% -73.1% ✅ 445,068 -103,848 -18.9% 4.20% $25.8M 2024-11-14 $60.35
2024 Q2 ADDED — — — 548,916 +210,673 +62.3% 4.74% $25.1M 2024-08-13 $44.62
2024 Q1 REDUCED 50.9% -33.9% ✅ 338,243 -350,073 -50.9% 5.08% $22.4M 2024-05-15 $54.40
2023 Q4 INITIATED — — — 688,316 — — 9.78% $27.4M 2024-02-14 $59.10

🏢 Other funds also holding KROS

As of 2026 Q1 — sorted by position size

AlphaQuest LLC 0.04% Y-Intercept (Hong Kong) Ltd 3Y 0.03% China Universal Asset Management Co., Ltd. 3Y 0.0% STRS OHIO 3Y 7Y 0.0% Sachetta, LLC 0.0% Sterling Capital Management LLC 3Y 7Y 0.0% Nuveen, LLC 0.0% Police & Firemen's Retirement System of New Jersey 0.0% IFP Advisors, Inc 3Y 7Y 0.0% HSBC HOLDINGS PLC 3Y 7Y 0.0%

FAQ About ADAR1 Capital Management, LLC and KROS

These are the practical questions this page is built to answer before you even open the full history table.

How long has ADAR1 Capital Management, LLC reported owning KROS?

ADAR1 Capital Management, LLC reported KROS across 10 quarterly 13F filings, from 2023 Q4 through 2025 Q4.

What was the largest reported KROS position in ADAR1 Capital Management, LLC's portfolio?

The largest reported portfolio weight for KROS was 11.03% in 2025 Q2.

What is the latest reported KROS position on this page?

The most recent filing on this page is 2025 Q4, when ADAR1 Capital Management, LLC reported 18,851 shares, equal to 0.03% of portfolio, with an estimated market value of $384K.

What does the chart on this KROS ownership page compare?

The chart compares ADAR1 Capital Management, LLC's quarterly KROS portfolio weight with the stock's indexed share price, so you can see whether the fund was building, trimming, or holding the position as price moved.

How well did ADAR1 Capital Management, LLC time their KROS position?

Based on 13F filing dates vs. subsequent KROS price moves, ADAR1 Capital Management, LLC correctly timed 7 out of 8 reported position changes (88%). The annualised alpha on KROS relative to SPY over the holding period was -55.2%.

← Back to ADAR1 Capital Management, LLC Holdings