Replimune Group, Inc.
US ˙ NasdaqGS ˙ US76029N1063

SecurityREPL / Replimune Group, Inc.
InstitutionCitadel Advisors Llc
ManagerKen Griffin
Latest Disclosed Ownership398,729 shares
Latest Disclosed Value $ 3,050,277
Citadel Advisors Llc ownership in REPL / Replimune Group, Inc.

On May 15, 2026 - Citadel Advisors Llc filed a 13F-HR form disclosing ownership of 398,729 shares of Replimune Group, Inc. (US:REPL) valued at $3,050,277 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 17, 2026 disclosing 158,359 shares of Replimune Group, Inc.. This represents a change in shares of 151.79% during the quarter. The current value of the position is $3,979,315 USD.

Citadel Advisors Llc has a history of taking positions in derivatives of the underlying security (REPL) in the form of stock options. The firm currently holds call options representing 247,000 of underlying shares valued at $1,889,550 USD and put options representing 178,100 of underlying shares valued at $1,362,465 USD .

Note: prior versions of this page mistakenly stated that the share values represented the number of options, not the number of underlying shares. For more information on the data backing these reports, please see the SEC document Frequently Asked Questions About Form 13F.

Institutional Ownership: 13F and NPORT Filings

The Security and Class in the table below are shown exactly as filed by the investor. We do our best to track continuity of investments through acquisitions, and this will be reflected in the table as changes in names. In addition to descriptive data, performance of the investment is shown over time. To calculate quarterly performance, we first calculate cost basis of the shares purchased during the quarter, then use that to calculate gross profit. Quarterly return is Gross Profit / Starting Portfolio value.

Note that cost basis is calculated and stored in thousands, so small quarterly changes in shares frequently result in a cost basis of zero.

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Institutional Put/Call Ratios
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In addition to reporting standard equity and debt issues, institutions with more than 100MM assets under management must also disclose their put and call option holdings. Since put options generally indicate negative sentiment, and call options indicate positive sentiment, we can get a sense of the overall institutional sentiment by plotting the ratio of puts to calls. The chart to the right plots the historical put/call ratio for this instrument.

Using Put/Call Ratio as an indicator of investor sentiment overcomes one of the key deficiencies of using total institutional ownership, which is that a significant amount of assets under management are invested passively to track indices. Passively-managed funds do not typically buy options, so the put/call ratio indicator more closely tracks the sentiment of actively-managed funds.

REPL / Replimune Group, Inc. Historical Put/Call Ratio
Disclosed Equity Positions (from 13F/NPORT Filings)
File
Date
Effective
Date
Form Security Class ID Avg Price
Paid (Est)
Reported
Shares
ΔShares ΔShares
(%)
Reported
Value
(x1000)
ΔValue
(%)
Alloc
(%)
ΔAlloc ΔAlloc (%) Cost Basis
(x1000)
Unrealized
Gain/Loss
(x1000)
2026-05-15 2026-03-31 13F REPLIMUNE GROUP COM 76029N106 398,729 240,370 151.79 3,050 98.18 0.0004
2026-02-17 2025-12-31 13F REPLIMUNE GROUP COM 76029N106 158,359 38,127 31.71 1,539 205.96 0.0002
2025-11-14 2025-09-30 13F REPLIMUNE GROUP COM 76029N106 120,232 -157,242 -56.67 504 -80.48 0.0001
2025-08-14 2025-06-30 13F REPLIMUNE GROUP COM 76029N106 277,474 254,719 1,119.40 2,578 1,066.06 0.0004
2025-05-15 2025-03-31 13F REPLIMUNE GROUP COM 76029N106 22,755 -113,609 -83.31 222 -86.61 0.0000
2025-02-14 2024-12-31 13F REPLIMUNE GROUP COM 76029N106 136,364 585 0.43 1,651 10.95 0.0003
2024-11-14 2024-09-30 13F REPLIMUNE GROUP COM 76029N106 135,779 -79,107 -36.81 1,488 -23.02 0.0003
2024-08-14 2024-06-30 13F REPLIMUNE GROUP COM 76029N106 214,886 147,446 218.63 1,934 251.45 0.0004
2024-05-15 2024-03-31 13F REPLIMUNE GROUP COM 76029N106 67,440 -140,097 -67.50 551 -68.55 0.0001
2024-02-14 2023-12-31 13F REPLIMUNE GROUP COM 76029N106 207,537 -989,498 -82.66 1,750 -91.46 0.0003
2023-11-14 2023-09-30 13F REPLIMUNE GROUP COM 76029N106 1,197,035 60,917 5.36 20,481 -22.36 0.0044
2023-08-14 2023-06-30 13F REPLIMUNE GROUP COM 76029N106 1,136,118 21,206 1.90 26,381 33.98 0.0055
2023-05-15 2023-03-31 13F REPLIMUNE GROUP COM 76029N106 1,114,912 558,936 100.53 19,689 30.20 0.0043
2023-02-14 2022-12-31 13F REPLIMUNE GROUP COM 76029N106 555,976 -90,047 -13.94 15,123 35.54 0.0035
2022-11-14 2022-09-30 13F REPLIMUNE GROUP COM 76029N106 646,023 62,706 10.75 11,157 9.43 0.0025
2022-08-15 2022-06-30 13F REPLIMUNE GROUP COM 76029N106 583,317 245,262 72.55 10,196 77.63 0.0026
2022-05-16 2022-03-31 13F REPLIMUNE GROUP COM 76029N106 338,055 -131,530 -28.01 5,740 -54.89 0.0012
2022-02-14 2021-12-31 13F REPLIMUNE GROUP COM 76029N106 469,585 89,350 23.50 12,725 12.90 0.0026
2021-11-15 2021-09-30 13F REPLIMUNE GROUP Cmn 76029N106 380,235 -11,241 -2.87 11,271 -25.06 0.0023
2021-08-16 2021-06-30 13F REPLIMUNE GROUP COM 76029N106 391,476 -342,821 -46.69 15,041 -32.86 0.0034
2021-05-21 2021-03-31 13F/A-1 REPLIMUNE GROUP COM 76029N106 734,297 -430,202 -36.94 22,404 -49.57 0.0055
2021-05-17 2021-03-31 13F REPLIMUNE GROUP COM 76029N106 734,297 -430,202 22,404 0.0055
2021-02-16 2020-12-31 13F REPLIMUNE GROUP COM 76029N106 1,164,499 714,087 158.54 44,426 328.45 0.0116
2020-11-16 2020-09-30 13F REPLIMUNE GROUP COM 76029N106 450,412 -2,299 -0.51 10,369 -7.83 0.0029
2020-08-14 2020-06-30 13F REPLIMUNE GROUP Cmn 76029N106 452,711 -39,167 -7.96 11,250 129.40 0.0040
2020-05-15 2020-03-31 13F REPLIMUNE GROUP Cmn 76029N106 491,878 -35,524 -6.74 4,904 -35.20 0.0022
2020-02-14 2019-12-31 13F REPLIMUNE GROUP Cmn 76029N106 527,402 332,486 170.58 7,568 179.26 0.0033
2019-11-14 2019-09-30 13F REPLIMUNE GROUP Cmn 76029N106 194,916 8,635 4.64 2,710 -0.77 0.0013
2019-08-14 2019-06-30 13F REPLIMUNE GROUP Cmn 76029N106 186,281 10,009 5.68 2,731 1.79 0.0013
2019-05-15 2019-03-31 13F REPLIMUNE GROUP Cmn 76029N106 176,272 -56,483 -24.27 2,683 15.25 0.0013
2019-02-14 2018-12-31 13F REPLIMUNE GROUP Cmn 76029N106 232,755 -156,780 -40.25 2,328 -62.88 0.0013
2018-11-13 2018-09-30 13F REPLIMUNE GROUP Cmn 76029N106 389,535 389,535 6,272 0.0028
Disclosed Call Options
File
Date
Effective
Date
Form Security Class ID Opt Avg Share
Price
Shares ΔShares
(%)
Value
(x1000)
ΔValue
(%)
Prior Allocation
(%)
Allocation
(%)
ΔAllocation
(%)
Cost Basis
(x1000)
Profit
(x1000)
Return
(%)
2026-05-15 2026-03-31 13F REPLIMUNE GROUP COM Call 247,000 -1.28 1,890 -22.30 n/a n/a n/a
2026-02-17 2025-12-31 13F REPLIMUNE GROUP COM Call 250,200 -1.88 2,432 127.62 n/a n/a n/a
2025-11-14 2025-09-30 13F REPLIMUNE GROUP COM Call 255,000 57.80 1,068 -28.85 n/a n/a n/a
2025-08-14 2025-06-30 13F REPLIMUNE GROUP COM Call 161,600 1,565.98 1,501 1,496.81 n/a n/a n/a
2025-05-15 2025-03-31 13F REPLIMUNE GROUP COM Call 9,700 21.25 95 -2.08 n/a n/a n/a
2025-02-14 2024-12-31 13F REPLIMUNE GROUP COM Call 8,000 -21.57 97 -13.51 n/a n/a n/a
2024-11-14 2024-09-30 13F REPLIMUNE GROUP COM Call 10,200 10.87 112 35.37 n/a n/a n/a
2024-08-14 2024-06-30 13F REPLIMUNE GROUP COM Call 9,200 -49.45 83 -44.59 n/a n/a n/a
2024-05-15 2024-03-31 13F REPLIMUNE GROUP COM Call 18,200 3.41 149 0.00 n/a n/a n/a
2024-02-14 2023-12-31 13F REPLIMUNE GROUP COM Call 17,600 -83.14 148 -91.71 n/a n/a n/a
2023-11-14 2023-09-30 13F REPLIMUNE GROUP COM Call 104,400 715.62 1,786 501.35 n/a n/a n/a
2023-08-14 2023-06-30 13F REPLIMUNE GROUP COM Call 12,800 85.51 297 145.45 n/a n/a n/a
2023-05-15 2023-03-31 13F REPLIMUNE GROUP COM Call 6,900 -91.93 122 -94.80 n/a n/a n/a
2023-02-14 2022-12-31 13F REPLIMUNE GROUP COM Call 85,500 0.35 2,326 58.06 n/a n/a n/a
2022-11-14 2022-09-30 13F REPLIMUNE GROUP COM Call 85,200 4.54 1,471 3.23 n/a n/a n/a
2022-08-15 2022-06-30 13F REPLIMUNE GROUP COM Call 81,500 531.78 1,425 550.68 n/a n/a n/a
2022-05-16 2022-03-31 13F REPLIMUNE GROUP COM Call 12,900 219 n/a n/a n/a
2022-03-11 2021-09-30 13F/A REPLIMUNE GROUP COM Call 0 -100.00 0 -100.00 n/a n/a n/a
2021-11-15 2021-09-30 13F REPLIMUNE GROUP COM Call 0 0 n/a n/a n/a
2021-08-16 2021-06-30 13F REPLIMUNE GROUP COM Call 11,400 438 n/a n/a n/a
Disclosed Put Options
File
Date
Effective
Date
Form Security Class ID Opt Avg Share Price Shares ΔShares
(%)
Value
(x1000)
ΔValue
(%)
Prior Allocation
(%)
Allocation
(%)
ΔAllocation
(%)
Cost Basis
(x1000)
Profit
(x1000)
Return
(%)
2026-05-15 2026-03-31 13F REPLIMUNE GROUP COM Put 178,100 75.30 1,362 37.99 n/a n/a n/a
2026-02-17 2025-12-31 13F REPLIMUNE GROUP COM Put 101,600 -73.94 988 -39.56 n/a n/a n/a
2025-11-14 2025-09-30 13F REPLIMUNE GROUP COM Put 389,800 156.45 1,633 15.65 n/a n/a n/a
2025-08-14 2025-06-30 13F REPLIMUNE GROUP COM Put 152,000 142.81 1,412 131.48 n/a n/a n/a
2025-05-15 2025-03-31 13F REPLIMUNE GROUP COM Put 62,600 1,741.18 610 1,387.80 n/a n/a n/a
2025-02-14 2024-12-31 13F REPLIMUNE GROUP COM Put 3,400 -73.23 41 -70.50 n/a n/a n/a
2024-11-14 2024-09-30 13F REPLIMUNE GROUP COM Put 12,700 209.76 139 286.11 n/a n/a n/a
2024-08-14 2024-06-30 13F REPLIMUNE GROUP COM Put 4,100 -85.25 37 -84.14 n/a n/a n/a
2024-05-15 2024-03-31 13F REPLIMUNE GROUP COM Put 27,800 -61.71 227 -62.91 n/a n/a n/a
2024-02-14 2023-12-31 13F REPLIMUNE GROUP COM Put 72,600 -34.77 612 -67.86 n/a n/a n/a
2023-11-14 2023-09-30 13F REPLIMUNE GROUP COM Put 111,300 309.19 1,904 201.74 n/a n/a n/a
2023-08-14 2023-06-30 13F REPLIMUNE GROUP COM Put 27,200 871.43 632 1,187.76 n/a n/a n/a
2023-05-15 2023-03-31 13F REPLIMUNE GROUP COM Put 2,800 180.00 49 81.48 n/a n/a n/a
2023-02-14 2022-12-31 13F REPLIMUNE GROUP COM Put 1,000 27 n/a n/a n/a
2022-03-11 2021-09-30 13F/A REPLIMUNE GROUP COM Put 0 -100.00 0 -100.00 n/a n/a n/a
2021-11-15 2021-09-30 13F REPLIMUNE GROUP COM Put 0 0 n/a n/a n/a
2021-08-16 2021-06-30 13F REPLIMUNE GROUP COM Put 33,100 -54.53 1,272 -42.73 n/a n/a n/a
2021-05-21 2021-03-31 13F/A REPLIMUNE GROUP COM Put 72,800 112.87 2,221 70.19 n/a n/a n/a
2021-05-17 2021-03-31 13F REPLIMUNE GROUP COM Put 72,800 2,221 n/a n/a n/a
2021-02-16 2020-12-31 13F REPLIMUNE GROUP COM Put 34,200 1,305 n/a n/a n/a
Legend
Shares
The total number of shares held by the institution at the end of the reporting period (the effective date). This is provided in the filing.
Value
The total value of the shares as of the effective date. This is provided in the filing.
Avg. Share Price
The weighted average share price of the shares held by the institution. We use FIFO accounting to determine this price
Class
This is the security class as indicated by the filer. There are a variety of values for this field. Common values include "EC" = equity common, "EP" - equity preferred
Allocation (%)
The percent of the institution's portfolio that this position represents. This is provided in NPORT filings. For 13F filings, we calculate it.
Change in Allocation
The change in allocation from the prior reporting period. This is calculated as current allocation - prior allocation.
Change in Allocation (%)
The percent change in allocation from the prior reporting period. This is calculated as (current allocation - prior allocation) / prior allocation.
Cost Basis
The total cost of the shares held. This is calculated as reported shares * avg. share price
Unrealized Gain/Loss
This is the market value of the position as of the effective date minus the cost basis.