RA Capital Nexus Fund, L.P.
CIK 1780117 · last filed 2026-09-30
RA Capital Nexus Fund, L.P. is a corporate insider who has filed 37 SEC Form 4 insider transactions across 8 companies since 2020. The most recent filing shows the insider exercised options covering $1.4M of CLYM on Sep 30, 2026. Across all open-market trades the lifetime net is +$1.34B, making them a net buyer over the disclosed history. Current disclosed insider exposure totals $361.0M across reported positions. The firm reports its address in Boston, MA. 91 SEC filings were submitted jointly with RA CAPITAL MANAGEMENT, L.P.
"Disclosed insider exposure" sums this person's most-recently-reported share counts across each company they're an insider in, multiplied by the current underlying price. It is not net worth — it misses retail holdings, private investments, real estate, index funds, and any company where the person isn't an SEC-reporting insider. For informational purposes only.
Charts
Trading activity, where the exposure sits, and each trade against the stock price.
ARTV price and trades
Daily close with each Form 4 filing on this company marked: green = open-market buy, red = open-market sale, purple = grants, exercises, gifts and other non-market transactions. Marker size scales with the dollar value.
Shares held
Shares owned after each reported transaction on this company (direct holdings as reported).
Open-market buying and selling
by monthDollar value of open-market purchases (code P, up) and sales (code S, down) across all companies, by filing month. Grants, exercises and gifts are excluded.
Exposure by company
latestMost recently reported shares × current price. Faded bars (*) have had no filing in 3 years, so the person may no longer hold them. Click a bar to chart that company.
Filer Profile
18TH FLOOR
BOSTON, MA 02116
Holdings By Company
| Symbol | Role | Shares | Price | Disclosed Exposure | Lifetime OM Net | Filings | Latest Filed |
|---|---|---|---|---|---|---|---|
| CLYM | Director | 3,671,766 | $8.81 | $32.35M | $0 | 2 | 2026-09-30 |
| ARTV | Director | 17,304,626 | $6.16 | $106.60M | $694.21M | 7 | 2026-07-31 |
| TYRA | Director | 8,477,275 | $20.42 | $173.11M | $100.00M | 4 | 2026-06-01 |
| 89bio, Inc. (ETNB) Delisted | Director | 335,364 | $14.84 | $4.98M | $300.00M | 3 | 2025-02-03 |
| VOR | Director | 1,891,036 | $18.33 | $34.66M | $0 | 1 | 2024-12-30 |
| Jade Biosciences, Inc. (AVTE) Delisted | Director | 225,534 | $93.80 | $21.16M | $7.75M | 3 | 2024-06-20 |
| NKTX | Director | 7,805,129 | $1.83 | $14.28M | $165.00M | 1 | 2022-04-28 |
| Akouos, Inc. (AKUS) Delisted | 10%+ Owner | 1,456,249 | $13.29 | $19.35M | $70.12M | 1 | 2020-07-02 |
Recent Filings
37 filings| Filed | Symbol | Action | Net Shares | Net $ | Link |
|---|---|---|---|---|---|
| 2026-09-30 | CLYM | Exer (M) | +490,000 | $1.37M | EDGAR |
| 2026-07-31 | ARTV | Buy (P) | +274,608 | $2.73M | EDGAR |
| 2026-07-28 | ARTV | Buy (P) | +247,914 | $2.48M | EDGAR |
| 2026-07-23 | ARTV | Buy (P) | +1,587,516 | $15.50M | EDGAR |
| 2026-07-01 | CLYM | Grant (A) | — | $0 | EDGAR |
| 2026-06-16 | ARTV | Buy (P) | +3,187,956 | $27.60M | EDGAR |
| 2026-06-11 | ARTV | Buy (P) | +6,166,332 | $45.90M | EDGAR |
| 2026-06-01 | TYRA | Grant (A) | — | $0 | EDGAR |
| 2025-11-21 | SION | Notice (144) | −9,924 | -$433.3K | EDGAR |
| 2025-11-20 | SION | Notice (144) | −2,023 | -$78.8K | EDGAR |
Notice (144 / 144/A): Form 144 is a notice of intent to sell restricted/control stock under Rule 144, filed before the sale; 144/A is an amendment. Many notices are pre-scheduled under Rule 10b5-1 plans. A Form 4 with code S typically follows within a few days when the planned sale executes; missing follow-up Form 4s suggest the notice was cancelled or modified.