delivered the opinion of the Court.
Federal Rule of Appellate Procedure 4(a)(4) provides that if any party files a timely motion “under Rule 59 [of the Federal Rules of Civil Procedure] to alter or amend the judgment,” a notice of appeal filed before the disposition of that motion “shall have no effect.” In this case, we decide whether a motion for discretionary prejudgment interest filed after the entry of judgment constitutes a Rule 59 motion to alter or amend the judgment and renders ineffective any notice of appeal filed before a ruling on that motion. If we decide the question in the affirmative, we are asked to decide whether this case nevertheless falls within the so-called “unique circumstances” exception to the timely appeal requirement announced in
Thompson
v.
INS,
I
The history of this case is complex but can be stated in a summary way. In September 1969, the Cavalier Bag Com *171 pany merged into E. T. Barwick Industries, Inc. (Barwick Industries). The Osternecks, owners of Cavalier and petitioners here, approved the merger and exchanged their stock in Cavalier for stock in Barwick Industries. In approving the transaction, petitioners allegedly relied on financial statements of Barwick Industries prepared by Ernst & Whinney, an independent certified public accounting firm and the respondent here.
Sometime later, petitioners concluded that Barwick Industries’ financial statements for two years preceding the merger misrepresented the company’s actual financial condition. In 1975, petitioners filed this action alleging violations of §§ 10(b) and 20 of the Securities Exchange Act of 1934, ch. 404, 48 Stat. 891, 899, as amended, 15 U. S. C. §§ 78j(b), 78t (1982 ed. and Supp. IV), Rule 10b-5 thereunder, 17 CFR §240.10b-5 (1975), and Georgia common law. Petitioners named as defendants, among others, Barwick Industries, respondent Ernst & Whinney, and certain directors and officers of Barwick Industries (E. T. Barwick, B. A. Talley, and M. E. Kellar).
After nearly 10 years of pretrial proceedings, the ease finally went to trial in 1984. The jury returned a verdict against Barwick Industries, M. E. Kellar, and B. A. Talley in the amount of $2,632,234 in compensatory damages for violations of the federal securities laws and Georgia common law. The jury found in favor of E. T. Barwick and respondent Ernst & Whinney.
Immediately after the jury verdict was announced, petitioners moved orally for prejudgment interest on the damages assessed against Barwick Industries, M. E. Kellar, and B. A. Talley. The District Judge, not wishing to hear argument on petitioners’ motion at that point, directed petitioners to submit their motion for prejudgment interest in writing within 10 days. He stated:
“The judgment will be entered on this particular verdict as soon as possible, then if prejudgment interest is *172 granted it will be — the judgment can be amended.” App. 5.
The judgment was filed and entered on the same day, January 30, 1985. Id., at 6-7. On February 11, 1985, petitioners, as directed, filed a written motion for prejudgment interest. Id., at 8-9.
During March 1985, the various parties filed notices of appeal and cross-appeal challenging the January 30 judgment. Of particular importance here, on March 1, 1985, while their motion for prejudgment interest was still pending, petitioners filed a notice of appeal from the January 30, 1985, judgment in favor of E. T. Barwick and respondent Ernst & Whinney. Id., at 34.
The District Court did not rule on petitioners’ motion for prejudgment interest until July 1, 1985. On that date, the court entered an order stating that the final judgment shall be “AMENDED” to reflect an “additional award of [$945,512.85 in] prejudgment interest on the federal securities claim.” Id., at 44. On July 9, 1985, the District Court filed a document captioned “AMENDED JUDGMENT,” stating that the January 30,1985, judgment “is hereby amended by adding thereto . . . [the] award of prejudgment interest,” but shall “remain the same in every other respect.” Id., at 45. After the amended judgment had been entered, petitioners filed one additional notice of appeal on July 31, 1985, captioned as a cross-appeal against M. E. Kellar, B. A. Talley, E. T. Bar-wick, and Barwick Industries. Id., at 46-47. But, and this is the vital fact for purposes of this case, the notice failed to include respondent Ernst & Whinney as a party to the appeal.
The Court of Appeals dismissed petitioners’ appeal as to Ernst & Whinney for lack of jurisdiction, finding that no effective notice had been filed.
Osterneck
v.
E. T. Barwick Industries, Inc.,
Petitioners sought review here, and we granted certiorari,
II
Rule 59(e) of the Federal Rules of Civil Procedure provides that a motion to “alter or amend the judgment” shall be served within 10 days of the entry of judgment. Rule 4(a)(4) of the *174 Federal Rules of Appellate Procedure provides that a notice of appeal filed while a timely Rule 59(e) motion is pending has no effect. Together, these Rules work to implement the finality requirement of 28 U. S. C. § 1291 by preventing the filing of an effective notice of appeal until the District Court has had an opportunity to dispose of all motions that seek to amend or alter what otherwise might appear to be a final judgment.
A
White
v.
New Hampshire Dept. of Employment Security, supra,
at 451, set the general framework for determining whether a postjudgment motion constitutes a Rule 59(e) motion to alter or amend the judgment. In that case, we held that a request for attorney’s fees under 42 U. S. C. § 1988 was not a Rule 59(e) motion. We stated in
White
that a postjudgment motion will be considered a Rule 59(e) motion where it involves “reconsideration of matters properly encompassed in a decision on the merits.”
We revisited the question of what constitutes a Rule 59(e) motion last Term. In
Buchanan
v.
Stanships, Inc.,
In
Budinich
v.
Becton Dickinson & Co.,
Under these precedents, the Court of Appeals was correct to conclude that a postjudgment motion for discretionary prejudgment interest constitutes a motion to alter or amend the judgment under Rule 59(e). First, we have repeatedly stated that prejudgment interest “is an element of [plaintiff’s] complete compensation.”
West Virginia
v.
United States,
Second, unlike a request for attorney’s fees or a motion for costs,, a motion for discretionary prejjudgment interest does not “raiste] issues wholly collateral' to. the judgment in the main cause of action,”
Buchanan, supra,
at 268; see
White,
*177
Our conclusion that a postjudgment motion for discretionary prejudgment interest is a Rule 59(e) motion also helps further the important goal of avoiding piecemeal appellate review of judgments. Cf.
United States
v.
Hollywood Motor Car Co.,
Ill
Petitioners contend that even if their March 1, 1985, notice of appeal was rendered ineffective by the filing of their motion for prejudgment interest, the Court of Appeals nevertheless should have heard their appeal based on the rationale of
Thompson
v.
INS,
Petitioners contend that the rationale of Thompson is applicable here because certain statements made by the District Court, as well as certain actions taken by the District Court, the District Court Clerk, and the Court of Appeals, led them to believe that their notice of appeal was timely. After reviewing these claims, the Court of Appeals declined to apply the Thompson exception, concluding:
“At no time has the district court or this court ever affirmatively represented to the Osternecks that their ap *179 peal was timely filed, nor did the Osternecks ever seek such assurance from either court.”825 F. 2d, at 1528 .
After reviewing the record, we conclude that the Court of Appeals was correct in declining to apply our reasoning in Thompson to excuse petitioners’ failure to file an effective notice of appeal. By its terms, Thompson applies only where a party has performed an act which, if properly done, would postpone the deadline for filing his appeal and has received specific assurance by a judicial officer that this act has been properly done. That is not the case here.
The judgment of the Court of Appeals is affirmed.
It is so ordered.
Notes
The Court of Appeals also found that petitioners’ July 31, 1985, notice of cross-appeal was ineffective as to the judgment in favor of respondent because respondent was not named in that notice.
We do not intend here to specify what factors a district court must consider when deciding under federal law whether to grant prejudgment interest. We offer this list of factors, taken from lower court cases, merely to demonstrate that the inquiry involves issues intertwined to a significant extent with the merits of the underlying controversy.
We do not believe the result should be different where prejudgment interest is available as a matter of right. It could be argued that where a party is entitled to prejudgment interest as a matter of right, a reexamination of issues relevant to the underlying merits is not necessary, and there
*177
fore the motion should be deemed collateral in the sense we have used that term. However, mandatory prejudgment interest, no less than discretionary prejudgment interest, serves to “remedy the injury giving rise to the [underlying] action,”
Budinich
v.
Becton Dickinson & Co.,
