Who owns Bain Capital GSS Investment Cor (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-Q2 13F filings (latest filed 2026-08-19). 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
16 tracked funds added or opened BCSS while 16 trimmed or exited it between 2026-Q1 and 2026-Q2 — the tape is split. When large holders disagree on a name, the funds moving first are sometimes ahead of the story.
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, Fort Baker Capital Management LP, sizes it at 4.3% of its own reported 13F book, while the median holder sizes it at 0.1% of theirs — a 4.2pp 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 2026-Q1 and 2026-Q2, across 54 tracked filers holding BCSS, 14 increased or opened the position and 23 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 2026-Q1 and 2026-Q2 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 4
- Alberta Investment Management Corp$16M
- BOUSSARD & GAVAUDAN GESTION SAS$5M
- MIZUHO SECURITIES USA LLC$2M
- WOLVERINE ASSET MANAGEMENT LLC$2M
Full exits 10
- HighTower Advisors, LLC$12M
- METEORA CAPITAL, LLC$11M
- Decagon Asset Management LLP$7M
- Lighthouse Investment Partners, LLC$5M
- Boussard & Gavaudan Investment Management LLP$5M
- CSS LLC/IL$4M
Largest adds
- J. Goldman & Co LP$8M
- Fort Baker Capital Management LP$3M
- Centiva Capital, LP$3M
- Jain Global LLC$3M
- READYSTATE ASSET MANAGEMENT LP$2M
- Radcliffe Capital Management, L.P.$813K
Largest trims
- JPMORGAN CHASE & CO$2M
- Shaolin Capital Management LLC$1M
- MILLENNIUM MANAGEMENT LLC$875K
- Saba Capital Management, L.P.$735K
- Lineage Point Capital LP$645K
- Clear Street Group Inc.$433K
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).
| Fund | Shares | Reported value | % of value | Quarter |
|---|---|---|---|---|
| Fort Baker Capital Management LP added | 4,248,685 | $44M | 9.7% | 2026-Q2 |
| Empyrean Capital Partners, LP | 3,990,000 | $41M | 9.1% | 2026-Q2 |
| ADAGE CAPITAL PARTNERS GP, L.L.C. | 3,000,000 | $31M | 6.8% | 2026-Q2 |
| Sculptor Capital LP | 1,723,855 | $18M | 3.9% | 2026-Q2 |
| Alberta Investment Management Corp new | 1,600,000 | $16M | 3.7% | 2026-Q2 |
| Mercuria Capital Strategies, LLC | 1,545,878 | $16M | 3.5% | 2026-Q2 |
| MOORE CAPITAL MANAGEMENT, LP | 1,500,000 | $15M | 3.4% | 2026-Q2 |
| J. Goldman & Co LP added | 1,481,156 | $15M | 3.4% | 2026-Q2 |
| Davidson Kempner Capital Management LP | 1,400,000 | $14M | 3.2% | 2026-Q2 |
| AQR Arbitrage LLC added | 1,184,099 | $12M | 2.7% | 2026-Q2 |
| Polar Asset Management Partners Inc. added | 1,050,000 | $11M | 2.4% | 2026-Q2 |
| LuminArx Capital Management LP | 1,003,379 | $10M | 2.3% | 2026-Q2 |
| ARISTEIA CAPITAL, L.L.C. | 1,000,000 | $10M | 2.3% | 2026-Q2 |
| Ghisallo Capital Management LLC | 1,000,000 | $10M | 2.3% | 2026-Q2 |
| MILLENNIUM MANAGEMENT LLC trimmed | 857,600 | $9M | 2.0% | 2026-Q2 |
| TWO SIGMA INVESTMENTS, LP | 854,756 | $9M | 2.0% | 2026-Q2 |
| PICTON MAHONEY ASSET MANAGEMENT | 700,000 | $7M | 1.6% | 2026-Q2 |
| HEALTHCARE OF ONTARIO PENSION PLAN TRUST FUND | 700,000 | $7M | 1.6% | 2026-Q2 |
| Linden Advisors LP | 600,000 | $6M | 1.4% | 2026-Q2 |
| Centiva Capital, LP added | 562,500 | $6M | 1.3% | 2026-Q2 |
| UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC trimmed | 518,210 | $5M | 1.2% | 2026-Q2 |
| Jain Global LLC added | 500,000 | $5M | 1.1% | 2026-Q2 |
| BOUSSARD & GAVAUDAN GESTION SAS new | 500,000 | $5M | 1.1% | 2026-Q2 |
| Verition Fund Management LLC trimmed | 472,950 | $5M | 1.1% | 2026-Q2 |
| Saba Capital Management, L.P. trimmed | 455,777 | $5M | 1.0% | 2026-Q2 |
| Magnetar Financial LLC | 450,000 | $5M | 1.0% | 2026-Q2 |
| Shaolin Capital Management LLC trimmed | 430,650 | $4M | 1.0% | 2026-Q2 |
| Periscope Capital Inc. | 425,000 | $4M | 1.0% | 2026-Q2 |
| Radcliffe Capital Management, L.P. added | 412,365 | $4M | 0.9% | 2026-Q2 |
| Lineage Point Capital LP trimmed | 400,000 | $4M | 0.9% | 2026-Q2 |
| BNP PARIBAS FINANCIAL MARKETS | 359,100 | $4M | 0.8% | 2026-Q2 |
| Hudson Bay Capital Management LP | 310,521 | $3M | 0.7% | 2026-Q2 |
| Bulldog Investors, LLP trimmed | 306,885 | $3M | 0.7% | 2026-Q2 |
| DLD Asset Management, LP added | 300,000 | $3M | 0.7% | 2026-Q2 |
| HIGHBRIDGE CAPITAL MANAGEMENT LLC | 300,000 | $3M | 0.7% | 2026-Q2 |
| READYSTATE ASSET MANAGEMENT LP added | 257,900 | $3M | 0.6% | 2026-Q2 |
| Schonfeld Strategic Advisors LLC | 249,876 | $3M | 0.6% | 2026-Q2 |
| COMMONWEALTH OF PENNSYLVANIA PUBLIC SCHOOL EMPLS RETRMT SYS | 233,150 | $2M | 0.5% | 2026-Q2 |
| MIZUHO SECURITIES USA LLC new | 230,000 | $2M | 0.5% | 2026-Q2 |
| HBK INVESTMENTS L P | 200,005 | $2M | 0.5% | 2026-Q2 |
| K2 PRINCIPAL FUND, L.P. | 200,000 | $2M | 0.5% | 2026-Q2 |
| CITIGROUP INC | 175,000 | $2M | 0.4% | 2026-Q2 |
| Context Capital Management, LLC | 150,000 | $2M | 0.3% | 2026-Q2 |
| WOLVERINE ASSET MANAGEMENT LLC new | 150,000 | $2M | 0.3% | 2026-Q2 |
| First Trust Capital Management L.P. | 149,995 | $2M | 0.3% | 2026-Q2 |
| BERKLEY W R CORP | 149,955 | $2M | 0.3% | 2026-Q2 |
| Clear Street Group Inc. trimmed | 138,933 | $1M | 0.3% | 2026-Q2 |
| SONA ASSET MANAGEMENT (US) LLC | 102,723 | $1M | 0.2% | 2026-Q2 |
| JPMORGAN CHASE & CO trimmed | 55,075 | $566K | 0.1% | 2026-Q2 |
| O'Connor Alternative Investments LLC | 50,000 | $514K | 0.1% | 2026-Q2 |
| Galaxy Digital Inc. | 50,000 | $514K | 0.1% | 2026-Q2 |
| PenderFund Capital Management Ltd. added | 26,600 | $273K | 0.1% | 2026-Q2 |
| STATE OF WISCONSIN INVESTMENT BOARD | 24,000 | $246K | 0.1% | 2026-Q2 |
| TORONTO DOMINION BANK trimmed | 2 | $21 | 0.0% | 2026-Q2 |
| HighTower Advisors, LLC trimmed | 1,138,966 | $12M | 2.6% | 2026-Q1 stale (1 quarter behind) |
| METEORA CAPITAL, LLC trimmed | 1,098,294 | $11M | 2.5% | 2026-Q1 stale (1 quarter behind) |
| Decagon Asset Management LLP added | 656,944 | $7M | 1.5% | 2026-Q1 stale (1 quarter behind) |
| Lighthouse Investment Partners, LLC | 500,000 | $5M | 1.1% | 2026-Q1 stale (1 quarter behind) |
| CSS LLC/IL new | 387,390 | $4M | 0.9% | 2026-Q1 stale (1 quarter behind) |
| TENOR CAPITAL MANAGEMENT Co., L.P. | 350,000 | $4M | 0.8% | 2026-Q1 stale (1 quarter behind) |
| GLAZER CAPITAL, LLC added | 335,000 | $3M | 0.8% | 2026-Q1 stale (1 quarter behind) |
| CANTOR FITZGERALD, L. P. new | 297,361 | $3M | 0.7% | 2026-Q1 stale (1 quarter behind) |
| Virtu Financial LLC added | 98,464 | $996K | 0.2% | 2026-Q1 stale (1 quarter behind) |
| JANE STREET GROUP, LLC new | 24,810 | $251K | 0.1% | 2026-Q1 stale (1 quarter behind) |
| HRT FINANCIAL LP new | 20,953 | $211K | 0.0% | 2026-Q1 stale (1 quarter behind) |
| Mint Tower Capital Management B.V. | 20,000 | $202K | 0.0% | 2026-Q1 stale (1 quarter behind) |
| Ilex Capital Partners (UK) LLP new | 200,000 | $2M | 0.4% | 2025-Q4 stale (2 quarters behind) |
| StoneX Group Inc. new | 40,988 | $413K | 0.1% | 2025-Q4 stale (2 quarters behind) |
2 parent filings withheld from the table above, and from the coverage figures, to avoid listing one book twice: Boussard & Gavaudan Investment Management LLP (last filed 2026-Q1, 500,000 shares) reconciles to its 1 current affiliate (500,000 shares) — 0.000% apart; OCONNOR, A Distinct Business Unit of UBS ASSET MANAGEMENT AMERICAS (LLC) (last filed 2025-Q4, 50,000 shares) reconciles to its 1 current affiliate (50,000 shares) — 0.000% apart.
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.