Arbitration Exhibit Numbering: C-Prefix for Claimant, R-Prefix for Respondent
Arbitration exhibit numbering differs from court conventions. Rather than plaintiff numbers and defendant letters, arbitration uses party-specific prefixes: Claimant exhibits are labeled C-1, C-2, C-3 and Respondent exhibits are labeled R-1, R-2, R-3 — a convention standard across AAA, JAMS, and FINRA.
- Claimant exhibits are numbered C-1, C-2, C-3 — the C- prefix identifies the Claimant as the party introducing the exhibit.
- Respondent exhibits are numbered R-1, R-2, R-3 — the R- prefix applies to all Respondent evidence regardless of whether the Respondent has filed a counterclaim.
- The C-/R- prefix convention is standard across AAA, JAMS, and FINRA arbitration proceedings and is not forum-specific.
- In multi-party arbitrations with more than one claimant, a common convention uses C1-1, C1-2 for the first claimant and C2-1, C2-2 for the second claimant.
- Joint exhibits — documents stipulated to by both parties — use a J- prefix (J-1, J-2) and are numbered in their own series.
- Exhibit numbering in arbitration starts at C-1, not C-0; sequential numbering begins at 1 regardless of the prefix used.
- For large exhibit sets (100+), zero-padding is recommended (C-001, C-002) to maintain correct sort order in digital exhibit platforms.
- ExhibitPrep includes built-in Claimant (C-prefix) and Respondent (R-prefix) stamp templates compatible with AAA, JAMS, and FINRA requirements.
Court Exhibits vs. Arbitration Exhibits: Convention Comparison
| Forum | Initiating Party | Responding Party | Example Labels |
|---|---|---|---|
| Court (most jurisdictions) | Plaintiff — Numbers | Defendant — Letters | PX-1, DX-A |
| AAA Arbitration | Claimant — C-prefix | Respondent — R-prefix | C-1, R-1 |
| JAMS Arbitration | Claimant — C-prefix | Respondent — R-prefix | C-1, R-1 |
| FINRA Arbitration | Claimant — C-prefix | Respondent — R-prefix | C-1, R-1 |
| Joint Exhibits (any forum) | Both parties — J-prefix | J-1, J-2 | |
* Always verify with your arbitration agreement and forum rules — some private arbitrations adopt different conventions.
Common Mistake: Using Court Conventions in Arbitration
Attorneys who primarily practice in court sometimes label arbitration exhibits as "Plaintiff's Exhibit 1" or "Defendant's Exhibit A" — using court terminology in an arbitration context. Arbitration parties are Claimants and Respondents, not Plaintiffs and Defendants. Using court terminology can cause confusion in the record and may prompt the arbitrator to request re-labeling before the hearing.
Multi-Party Arbitration Numbering
When an arbitration involves more than one claimant or respondent, the standard C-/R- prefix is modified to identify each party individually. The most common approach uses a number suffix after the party letter:
Multiple Claimants
Multiple Respondents
Practical note: Multi-party conventions should be confirmed in a pre-hearing procedural order. Some arbitrators prefer that all claimants share a single C- series and all respondents share a single R- series to simplify the record.
Practical Tips for Arbitration Exhibit Numbering
Start at C-1, not C-0
Sequential exhibit numbering begins at 1 in all arbitration forums. C-0 is not a standard label and will cause confusion.
Use zero-padding for large exhibit sets
If you expect 100 or more exhibits, use C-001 format so that digital sorting works correctly. C-10 sorts before C-9 without zero-padding.
Counterclaim exhibits keep the R- prefix
When a Respondent files a counterclaim, all their exhibits — whether related to the original claim or the counterclaim — continue using the R- prefix. There is no separate series for counterclaim exhibits.
Joint exhibits use J-prefix in their own series
Stipulated exhibits (J-1, J-2) are numbered in a separate series from party exhibits. They are not numbered within the C- or R- series.
Reserve numbers for anticipated rebuttal exhibits
If you plan to introduce rebuttal exhibits, leave a gap in your numbering (e.g., stop at C-45 and reserve C-50 through C-60 for rebuttal) to keep the record organized.
Confirm the convention in the first scheduling order
Ask the arbitrator to confirm the exhibit labeling convention at the initial pre-hearing conference. This avoids re-labeling later and ensures opposing counsel uses the same system.
C-prefix and R-prefix templates built in — ready in seconds
ExhibitPrep includes dedicated Claimant (C-1, C-2...) and Respondent (R-1, R-2...) stamp templates. Batch-stamp an entire exhibit set in one session.
ExhibitPrep Templates for Arbitration Numbering
Claimant's Exhibit (C-prefix)
Pre-configured with C- prefix for standard arbitration numbering. Automatically stamps C-1, C-2, C-3 across your entire document set.
Respondent's Exhibit (R-prefix)
Pre-configured with R- prefix. Specific to arbitration — distinct from the family law Respondent template used in court proceedings.
Joint Exhibit (J-prefix)
For stipulated exhibits agreed to by both parties. Creates a separate J- series that does not interfere with party exhibit numbering.
Custom Prefix
For multi-party proceedings or forums using non-standard conventions, enter any prefix (C1-, C2-, R1-, R2-) and ExhibitPrep applies it across your document set.
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Arbitration Exhibit Numbering FAQ
Why do arbitration exhibits use C- and R- prefixes instead of numbers and letters?
Arbitration uses the terms "Claimant" and "Respondent" rather than "Plaintiff" and "Defendant," so the C- and R- prefix convention was adopted to clearly attribute exhibits to the party introducing them. In court, plaintiff exhibits use numbers and defendant exhibits use letters — but that convention does not translate cleanly to arbitration terminology. The prefix system (C-1, C-2, R-1, R-2) makes clear who introduced each exhibit without relying on a number-versus-letter distinction that has no inherent meaning in an arbitration context.
How does exhibit numbering work in multi-party arbitrations?
In multi-party arbitrations with more than one claimant or respondent, each party can use a modified prefix to distinguish their exhibits. A common convention is C1- for the first claimant and C2- for the second claimant (e.g., C1-1, C1-2, C2-1, C2-2), and similarly R1- and R2- for multiple respondents. Some forums simply have each party use sequential numbering within their designated prefix range. Check your arbitration agreement or the forum's procedural order for the specific convention required.
What are joint exhibits in arbitration and how are they numbered?
Joint exhibits are documents that both parties stipulate to — meaning neither party contests authenticity or admissibility, and the document is introduced by agreement. Joint exhibits are typically labeled J-1, J-2, J-3 and so on. They are less common than party-specific exhibits but frequently used for foundational documents such as the underlying contract in a contract dispute or a jointly commissioned expert report. Not all arbitration forums require joint exhibits; some simply have each party introduce the document separately.
When a Respondent files a counterclaim, do they use a different prefix for counterclaim exhibits?
No. When a Respondent files a counterclaim, their exhibits still use the R- prefix — there is no separate prefix for counterclaim exhibits. The R- prefix identifies the Respondent as the party introducing the exhibit regardless of whether those exhibits relate to the original claim or the counterclaim. If the Respondent-Claimant and original Claimant need to keep their exhibits clearly separated in a complex proceeding, the parties can agree to a modified convention, but the standard practice is to maintain a single R- series for all Respondent exhibits.
When should I use letters (A, B, C) versus C-prefix numbering for arbitration exhibits?
Use C- prefix (C-1, C-2) and R- prefix (R-1, R-2) numbering for arbitration proceedings. The alphabetic convention (Exhibit A, Exhibit B) is a court convention used for defendant exhibits in many jurisdictions and is generally not the standard format for arbitration. If a specific arbitration agreement or arbitrator order specifies alphabetic labeling, follow that instruction — but absent a specific requirement, use the C-/R- prefix format that is standard across AAA, JAMS, and FINRA proceedings.
How are arbitration exhibit labels different from court exhibit labels?
In court, the convention in most jurisdictions is for plaintiff exhibits to be labeled with numbers (Plaintiff's Exhibit 1, 2, 3) and defendant exhibits to be labeled with letters (Defendant's Exhibit A, B, C) per each court's local rules. In arbitration, both parties use numbered exhibits with a party-specific prefix: Claimant uses C-1, C-2, C-3 and Respondent uses R-1, R-2, R-3. This prefix approach is more transparent because the letter itself identifies the party, rather than relying on the number-versus-letter distinction that varies by jurisdiction in court proceedings.
Related Resources
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ExhibitPrep is a document preparation tool. This page is for informational purposes only and does not constitute legal advice. Consult with qualified legal counsel regarding specific arbitration forum requirements.