Who owns BCSS (BCSS)
Which tracked institutional funds hold BCSS, how they are positioned, and who is buying versus exiting — from SEC Form 13F-HR filings. See BCSS company fundamentals →
Ownership as of the 2026-Q1 13F filings. 13F is disclosed up to 45 days after quarter-end, so the most recent quarter fills in over the following weeks.
How the tape is positioned
The tracked-fund tape on BCSS is one-sided between 2025-Q4 and 2026-Q1: 24 added or opened and 8 trimmed or exited — on balance accumulating.
A prompt to read the filings, not a verdict. 13F is a quarter-end snapshot disclosed up to 45 days late; a fund adds or exits for mandate, benchmark, and timing reasons that have nothing to do with a view on the stock. This is a starting question, not a signal to trade.
Conviction spread
BCSS’s largest tracked holder by dollar value, Empyrean Capital Partners, LP, sizes it at 1.4% of its own reported 13F book, while the median holder sizes it at 0.1% of theirs — a 1.4pp conviction gap — its largest holder concentrates the name more heavily than the typical one.
Book-share is each fund’s reported value in BCSS divided by its whole reported 13F book, so it is comparable across funds of different sizes and is unaffected by stock splits. A higher share means a fund has committed more of its book to the name — a starting question about conviction, not a verdict or a signal to trade.
Institutional & insider positioning
Between 2025-Q4 and 2026-Q1, across 63 tracked filers holding BCSS, 29 increased or opened the position and 13 reduced or closed it; over the same quarter, there were no open-market insider Form 4s.
This fuses two public signals for the same quarter — how tracked institutions changed their positions and whether insiders bought or sold in the open market. It describes what was filed; it is a starting question, not a verdict or a signal to trade.
New buyers & exits
Funds opening or closing a position in BCSS between the 2025-Q4 and 2026-Q1 13F filings, and the largest changes among funds holding it in both. New buyers and exits are counted on fund presence (split-invariant); adds and trims are measured on reported value.
New buyers 14
- Empyrean Capital Partners, LP$40M
- LuminArx Capital Management LP$10M
- Ghisallo Capital Management LLC$10M
- HEALTHCARE OF ONTARIO PENSION PLAN TRUST FUND$7M
- UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC$6M
- CSS LLC/IL$4M
Full exits 2
- Ilex Capital Partners (UK) LLP$2M
- OCONNOR, A Distinct Business Unit of UBS ASSET MANAGEMENT AMERICAS (LLC)$504K
Largest adds
- Fort Baker Capital Management LP$12M
- MILLENNIUM MANAGEMENT LLC$3M
- JPMORGAN CHASE & CO$2M
- Centiva Capital, LP$2M
- Shaolin Capital Management LLC$2M
- Decagon Asset Management LLP$943K
Largest trims
- J. Goldman & Co LP$3M
- Periscope Capital Inc.$994K
- Hudson Bay Capital Management LP$892K
- Clear Street Group Inc.$660K
- HighTower Advisors, LLC$435K
- AQR Arbitrage LLC$319K
Institutional holders
One row per tracked fund, largest reported value first. “% of value” is the fund’s share of this security’s tracked institutional value — not of shares outstanding. Rows marked stale are from an earlier filing than the security’s latest quarter — that fund is absent from the newest snapshot (position exited, or reported under a different name).
Ownership over time
Tracked institutional holder count and total shares held by filing quarter (independent scales). The curated-era tail and any mid-ingest latest quarter are handled honestly — a partial quarter is not drawn as a collapse.
Reading this table
Funds hold the same stock for different reasons — an index fund “holds” almost everything, an active manager sizes a name to a mandate and a benchmark, and each fund entered at its own price and time. Because 13F is filed up to 45 days after quarter-end, every row is a backward-looking snapshot; a manager may have traded since. Share-class siblings (a company’s A and C shares) are rolled up to one line so a dual-class name is never double-counted. Compare like-for-like. A large holder is not an endorsement, and a fund exiting is not a warning — this is a starting question, not a verdict.
About 13F filings
A Form 13F is a quarterly disclosure that institutional investment managers with over $100 million in US-listed equities must file with the SEC. In plain English: it is a snapshot of the long stock positions a fund held at the end of a quarter. It covers long US-listed equities only — not short positions, options, cash, or private holdings — and the funds shown are the large sample we track, not the complete 13F universe.