Who owns SPRB (SPRB)
Which tracked institutional funds hold SPRB, how they are positioned, and who is buying versus exiting — from SEC Form 13F-HR filings. See SPRB 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 SPRB is one-sided between 2025-Q4 and 2026-Q1: 3 added or opened and 17 trimmed or exited — on balance reducing.
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
SPRB’s largest tracked holder by dollar value, Ikarian Capital, LLC, sizes it at 1.1% of its own reported 13F book, while the median holder sizes it at 0.0% of theirs — a 1.1pp conviction gap — its largest holder concentrates the name more heavily than the typical one.
Book-share is each fund’s reported value in SPRB 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 32 tracked filers holding SPRB, 16 increased or opened the position and 16 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 SPRB 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 3
- MILLENNIUM MANAGEMENT LLC$7M
- VANGUARD CAPITAL MANAGEMENT LLC$1M
- DIADEMA PARTNERS LP$654K
Full exits 5
- Schonfeld Strategic Advisors LLC$2M
- Caligan Partners LP$2M
- Stonepine Capital Management, LLC$2M
- VANGUARD GROUP INC$2M
- SUPERSTRING CAPITAL MANAGEMENT LP$1M
Largest trims
- Squadron Capital Management LLC$5M
- WELLINGTON MANAGEMENT GROUP LLP$4M
- Ikarian Capital, LLC$3M
- CITADEL ADVISORS LLC$2M
- BOOTHBAY FUND MANAGEMENT, LLC$1M
- ADAR1 Capital Management, LLC$1M
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 |
|---|---|---|---|---|
| Ikarian Capital, LLC | 121,356 | $8M | 14.0% | 2026-Q1 |
| MILLENNIUM MANAGEMENT LLC added | 111,888 | $7M | 12.9% | 2026-Q1 |
| CITADEL ADVISORS LLC | 69,999 | $5M | 8.0% | 2026-Q1 |
| ADAR1 Capital Management, LLC added | 58,600 | $4M | 6.7% | 2026-Q1 |
| Alyeska Investment Group, L.P. | 51,671 | $3M | 5.9% | 2026-Q1 |
| BOOTHBAY FUND MANAGEMENT, LLC trimmed | 42,080 | $3M | 4.8% | 2026-Q1 |
| BALYASNY ASSET MANAGEMENT L.P. | 40,000 | $3M | 4.6% | 2026-Q1 |
| Carlyle Group Inc. | 38,620 | $3M | 4.4% | 2026-Q1 |
| Quinn Opportunity Partners LLC added | 26,810 | $2M | 3.1% | 2026-Q1 |
| WELLINGTON MANAGEMENT GROUP LLP trimmed | 22,781 | $1M | 2.6% | 2026-Q1 |
| ExodusPoint Capital Management, LP trimmed | 22,000 | $1M | 2.5% | 2026-Q1 |
| VANGUARD CAPITAL MANAGEMENT LLC new | 18,337 | $1M | 2.1% | 2026-Q1 |
| BlackRock, Inc. | 16,938 | $1M | 1.9% | 2026-Q1 |
| GEODE CAPITAL MANAGEMENT, LLC added | 12,889 | $843K | 1.5% | 2026-Q1 |
| Squadron Capital Management LLC trimmed | 12,200 | $797K | 1.4% | 2026-Q1 |
| DIADEMA PARTNERS LP new | 10,000 | $654K | 1.1% | 2026-Q1 |
| STEMPOINT CAPITAL LP new | 6,360 | $416K | 0.7% | 2026-Q1 |
| VANGUARD FIDUCIARY TRUST CO new | 5,514 | $360K | 0.6% | 2026-Q1 |
| GOLDMAN SACHS GROUP INC trimmed | 5,506 | $360K | 0.6% | 2026-Q1 |
| STATE STREET CORP trimmed | 5,400 | $353K | 0.6% | 2026-Q1 |
| Resolute Capital Asset Partners LLC | 4,000 | $261K | 0.5% | 2026-Q1 |
| UBS Group AG trimmed | 3,919 | $256K | 0.5% | 2026-Q1 |
| Persistent Asset Partners Ltd new | 2,528 | $165K | 0.3% | 2026-Q1 |
| MORGAN STANLEY added | 1,415 | $92K | 0.2% | 2026-Q1 |
| Lion Point Capital, LP | 1,000 | $65K | 0.1% | 2026-Q1 |
| CITIGROUP INC trimmed | 939 | $61K | 0.1% | 2026-Q1 |
| Vanguard Global Advisers, LLC new | 452 | $30K | 0.1% | 2026-Q1 |
| Sound Income Strategies, LLC | 200 | $14K | 0.0% | 2026-Q1 |
| JONES FINANCIAL COMPANIES LLLP added | 193 | $12K | 0.0% | 2026-Q1 |
| Tower Research Capital LLC (TRC) added | 140 | $9K | 0.0% | 2026-Q1 |
| CALDWELL SUTTER CAPITAL, INC. | 13 | $850 | 0.0% | 2026-Q1 |
| Cassaday & Co Wealth Management LLC new | 2 | $130 | 0.0% | 2026-Q1 |
| Schonfeld Strategic Advisors LLC new | 24,767 | $2M | 3.8% | 2025-Q4 stale |
| Caligan Partners LP new | 20,514 | $2M | 3.1% | 2025-Q4 stale |
| Stonepine Capital Management, LLC new | 19,742 | $2M | 3.0% | 2025-Q4 stale |
| VANGUARD GROUP INC trimmed | 17,873 | $2M | 2.7% | 2025-Q4 stale |
| SUPERSTRING CAPITAL MANAGEMENT LP trimmed | 12,137 | $1M | 1.9% | 2025-Q4 stale |
| Rock Springs Capital Management LP | 2,609,125 | $757K | 1.3% | 2025-Q1 stale |
| SkyView Investment Advisors, LLC new | 3,000 | $261K | 0.5% | 2025-Q4 stale |
| Cable Car Capital, LP new | 26,666 | $239K | 0.4% | 2025-Q3 stale |
| NORTHERN TRUST CORP trimmed | 2,422 | $211K | 0.4% | 2025-Q4 stale |
| BNP PARIBAS FINANCIAL MARKETS added | 2,000 | $174K | 0.3% | 2025-Q4 stale |
| RENAISSANCE TECHNOLOGIES LLC trimmed | 382,900 | $111K | 0.2% | 2025-Q1 stale |
| ACADIAN ASSET MANAGEMENT LLC | 1,045,828 | $74K | 0.1% | 2025-Q2 stale |
| TWO SIGMA SECURITIES, LLC added | 47,686 | $14K | 0.0% | 2025-Q1 stale |
| XTX Topco Ltd added | 41,217 | $12K | 0.0% | 2025-Q1 stale |
| Shay Capital LLC | 38,119 | $11K | 0.0% | 2025-Q1 stale |
| Virtu Financial LLC added | 39,426 | $11K | 0.0% | 2025-Q1 stale |
| JANE STREET GROUP, LLC added | 37,429 | $11K | 0.0% | 2025-Q1 stale |
| BANK OF AMERICA CORP /DE/ added | 93 | $8K | 0.0% | 2025-Q4 stale |
| TWO SIGMA INVESTMENTS, LP trimmed | 20,545 | $6K | 0.0% | 2025-Q1 stale |
| Ground Swell Capital, LLC new | 17,312 | $5K | 0.0% | 2025-Q1 stale |
| Marex Group plc | 14,800 | $4K | 0.0% | 2025-Q1 stale |
| TWO SIGMA ADVISERS, LP trimmed | 12,200 | $4K | 0.0% | 2025-Q1 stale |
| ROYAL BANK OF CANADA trimmed | 40 | $3K | 0.0% | 2025-Q4 stale |
| OSAIC HOLDINGS, INC. new | 133 | $931 | 0.0% | 2025-Q3 stale |
| GROUP ONE TRADING LLC trimmed | 1,153 | $334 | 0.0% | 2025-Q1 stale |
| JPMORGAN CHASE & CO trimmed | 65 | $19 | 0.0% | 2025-Q1 stale |
| CONCOURSE FINANCIAL GROUP SECURITIES, INC. | 0 | — | 0.0% | 2025-Q1 stale |
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.