Baker Bros. Advisors CERS Position
ActiveBaker Bros. Advisors held their position in Cerus Corporation (CERS) in Q4 2025, holding $20.6M worth of shares across 10,008,345 shares.
The position was first reported in Q1 2023 and has been tracked across 12 quarterly 13F filings.
1 other tracked fund also holds CERS.
There is an upcoming Phase 2 readout in 107 days (Jul 30, 2026), making the timing of Baker Bros.'s position particularly relevant.
About Cerus Corporation
Cerus Corporation operates as a biomedical products company. The company focuses on developing and commercializing the INTERCEPT Blood System to enhance blood safety. Its INTERCEPT Blood System, a proprietary technology for controlling biological replication that is designed to reduce blood-borne pathogens in donated blood components intended for transfusion. The company offers INTERCEPT Blood Systems for platelets and plasma, which is designed to inactivate blood-borne pathogens in platelets and plasma donated for transfusion; INTERCEPT Blood System for red blood cells to inactivate blood-borne pathogens in red blood cells donated for transfusion; and INTERCEPT Blood System for Cryoprecipitation that uses its plasma system to produce pathogen reduced cryoprecipitated fibrinogen complex for the treatment and control of bleeding, including massive hemorrhage associated with fibrinogen deficiency, as well as pathogen reduced plasma, cryoprecipitate reduced. It sells platelet and plasma systems through its direct sales force and distributors in the United States, Europe, the Commonwealth of Independent States, the Middle East, Latin America, and internationally. The company was incorporated in 1991 and is headquartered in Concord, California.
Full company profile →Short Interest
7.2%
5.5 days to cover
Baker Bros. Advisors CERS Position History
| Quarter | Action | Shares | Change | Value |
|---|---|---|---|---|
| Q4 2025 | Held | 10,008,345 | — | $20.6M |
| Q3 2025 | Decreased | 10,008,345 | -2,875,499 | $15.9M |
| Q2 2025 | Decreased | 12,883,844 | -6,467,243 | $18.2M |
| Q1 2025 | Decreased | 19,351,087 | -126,252 | $26.9M |
| Q4 2024 | Held | 19,477,339 | — | $30.0M |
| Q3 2024 | Held | 19,477,339 | — | $33.9M |
| Q2 2024 | Held | 19,477,339 | — | $34.3M |
| Q1 2024 | Held | 19,477,339 | — | $36.8M |
| Q4 2023 | Increased | 19,477,339 | +2,237,838 | $42.1M |
| Q3 2023 | Increased | 17,239,501 | +1,171,943 | $27.9M |
| Q2 2023 | Held | 16,067,558 | — | $39.5M |
| Q1 2023 | New | 16,067,558 | +16,067,558 | $47.7M |
Frequently Asked Questions
Does Baker Bros. Advisors own CERS?
Yes. As of Q4 2025, Baker Bros. Advisors holds 10,008,345 shares of Cerus Corporation (CERS) valued at $20.6M. This data comes from their SEC 13F filing.
How many hedge funds own CERS?
2 specialist biotech hedge funds currently hold CERS, including Deerfield Management. When 3 or more specialist funds hold the same stock, BiotechEdge flags it as a convergence signal.
When did Baker Bros. Advisors first buy CERS?
Baker Bros. Advisors's position in CERS was first reported in Q1 2023. 13F filings are reported with a 45-day delay, so the actual purchase may have occurred earlier in the quarter.
Is Baker Bros. Advisors's CERS position increasing or decreasing?
Baker Bros. Advisors held their CERS position unchanged in the most recent quarter.
Get the weekly biotech signal briefing
Fund moves, convergence shifts, insider buys, and catalyst alerts — delivered free every Monday.
CERSCompany Page →
All fund holders, insider trades, catalysts, and cash runway
Baker Bros. AdvisorsPortfolio →
Full 13F holdings, sector breakdown, and top movers
Drill into any signal
Fund Convergence
See which stocks multiple specialist funds are buying at once
Catalyst Calendar
Every PDUFA date, Phase 3 readout, and AdCom in one view
Insider Trading
When executives buy their own stock — the strongest bullish signal
Cash Runway
Which biotechs are running low on cash and face dilution risk
Short Squeeze
High short interest + fund buying + upcoming catalyst = squeeze setup
Signal Rankings
Every signal in one composite score — ranked by conviction
Biotech Movers
Stocks with the most signal activity right now across all signals
13F Changes
What top biotech funds bought and sold in the latest 13F filing
Want AI context on every signal? Start free trial →