OPINION AND ORDER
Before the Court are Plaintiffs’ objections to Magistrate Judge Grubin’s Report and Recommendation, dated August 21, 1995, which denied Plaintiffs’ motion, pursuant to Federal Rule of Civil Procedure 56(e) (“Rule 56(e)”), to strike the affidavit of Federal Bureau of Investigation (“FBI”) Special Agent Vernon R. Thornton (“Agent Thornton”). *454For the reasons stated below, Plaintiffs’ motion is granted in part and denied in part.
BACKGROUND
In this action, Plaintiffs seek injunctive and declaratory relief for the FBI’s allegedly unconstitutional investigation of them (“Investigation”). Plaintiffs claim that the Investigation began in 1968 and has continued to date. Plaintiffs seek, inter alia, to enjoin: (1) the FBI from any further unlawful investigation of them (“Investigation Claim”) and (2) the release of FBI files gathered in violation of their constitutional rights.
In May 1985, Defendants moved for summary judgment. Attached to Defendants’ motion was the affidavit of Agent Thornton (“Thornton Affidavit I”).1 Plaintiffs responded to Defendants’ summary judgment motion by filing a motion pursuant to Rule 56(e) to strike Thornton Affidavit I. See Pis.’ Mem. of Law in Supp. Mot. to Strike. In further support of their motion for summary judgment, Defendants submitted additional affidavits of Agent Thornton in July 1985 (“Thornton Affidavit II”) and in November 1989 (“Thornton Affidavit III”).2 In June 1990, Plaintiffs filed a memorandum in opposition to Defendants’ summary judgment motion.
In a Report and Recommendation dated August 21, 1995 (“Report”), Magistrate Judge Grubin recommended that the Court grant Defendants’ motion for summary judgment. In that Report, the Magistrate Judge also denied Plaintiffs’ motion to strike Agent Thornton’s testimony. See Report at 36-41.3 Currently before the Court are Plaintiffs’ objections to the Magistrate Judge’s denial of their Rule 56(e) motion.4 See Pis.’ Objs. to Report and Recommendation of Magis. J. Grubin (“Pis.’ Objs.”).
DISCUSSION
This Court reviews the Magistrate Judge’s denial of Plaintiffs’ motion to strike under the deferential “clearly erroneous” or “contrary to law” standard. Fed.R.Civ.P. 72(a); St. Paul Fire and Marine Ins. Co. v. Heath Fielding Ins. Broking Ltd., No. 91 Civ. 0748, 1996 WL 19028, at *11 (S.D.N.Y. Jan. 17, 1996) (Lowe, J.); City Builders Supply Co. v. Nat'l Gypsum Co., No. 81 Civ. 0203, 1984 WL 3209, at *1 (D.Mass. Sept. 24, 1984).
I. Rule 56(e) Motion
Rule 56(e) requires a party moving for summary judgment to submit supporting affidavits based on personal knowledge. Fed.R.Civ.P. 56(e);5 Sellers v. M.C. Floor Crofters, Inc., 842 F.2d 639, 643 (2d Cir. 1988). Generally, affiants have personal knowledge to testify about their experiences. See, e.g., Christian Dior-New York, Inc. v. Koret, Inc., 792 F.2d 34, 38 (2d Cir.1986) (corporate officer affiant had requisite personal knowledge under Rule 56(e) to testify about his impressions of contract negotiations). Affiants may also testify to the contents of records they have reviewed in their official capacities. See Londrigan v. Federal Bureau of Investigation, 670 F.2d 1164, 1174 (D.C.Cir.1981) (refusing to strike portion of FBI agent’s affidavit that described affiant’s *455“own observations upon review of the documents” in FBI’s files).
Furthermore, under Federal Rule of Evidence 803(10) (“Rule 803(10)”), an affiant may testify to the absence of records where, “after a diligent search of the records regularly kept by a public office or agency, a certain record, entity, report, etc., has not been found.” United States v. Pinto-Mejia, 720 F.2d 248, 257 (2d Cir.1983) (citation omitted); United States v. Gallego, 913 F.Supp. 209, 216 (S.D.N.Y.1996) (same); see, e.g., United States v. Lee, 589 F.2d 980, 988 (9th Cir.1979) (upholding admissibility of affidavits by CIA officials, which described absence of records, because affiants “were in position to know what their files contained.”), cert. denied, 444 U.S. 969, 100 S.Ct. 460, 62 L.Ed.2d 382 (1979). “From such a statement, the factfinder may infer that an event that normally would be reflected in the public record did not occur.” Pinto-Mejia, 720 F.2d at 257 (emphasis added); see United States v. Robinson, 544 F.2d 110, 114 (2d Cir.) (“The absence of a record of an event which would ordinarily be recorded gives rise to a legitimate negative inference that the event did not occur.”), cert. denied, 434 U.S. 1050, 98 S.Ct. 901, 54 L.Ed.2d 803 (1978).
Any portion of an affidavit that is not based on personal knowledge should be stricken. See United States v. Alessi, 599 F.2d 513, 515 (2d Cir.1979) (striking six paragraphs of affidavit that were not based on personal knowledge while considering rest of affidavit). When ultimate facts and legal conclusions appear in an affidavit, such extraneous material should also be disregarded by the court. See A.L. Pickens Co., Inc. v. Youngstown Sheet and Tube Co., 650 F.2d 118, 121 (6th Cir.1981) (striking portion of accounting director’s affidavit that asserted legal conclusions); Ball v. Metallurgie Hoboken-Overpelt S.A., No. 87 Civ. 191, 1989 WL 87418, at *8 (N.D.N.Y.1989) (indicating that unsworn affidavit included ultimate facts and legal conclusions in violation of Rule 56(e)), aff'd, 902 F.2d 194 (2d Cir.), cert. denied, 498 U.S. 854, 111 S.Ct. 150, 112 L.Ed.2d 116 (1990); 6 Moore’s Federal Practice § 56.22[1] (1995) (“[t]he affidavit is no place for ultimate facts and conclusions of law”); see also Kamen v. American Tel. & Tel. Co., 791 F.2d 1006, 1011 (2d Cir.1986) (district court improperly declined to strike conclusory “crucial statement” in affidavit under Rule 56(e)).
II. Plaintiffs’ Objections to the Rule 56(e) Rulings6
A. Thornton Affidavit I
1. Paragraph 37
Plaintiffs object to paragraph 3 of Thornton Affidavit I due to Agent Thornton’s alleged lack of personal knowledge. See Pis.’ Objs. at 9. The Court finds that the Magistrate Judge erred to the extent that she refused to strike Agent Thornton’s assertion in paragraph 3 of Thornton Affidavit I that “the FBI has never reopened the investigation of [Plaintiffs] under that title, or any pretext title, nor does it have any plans to do so.” See Thornton Aff. I, 113. Agent Thornton’s positions as supervisor of the FBI’s domestic security investigations from 1977 to 1979 and as overseer of the FBI’s records department from 1985 to 1989 could not provide him with the personal knowledge necessary to assert the conclusions in this portion of paragraph 3 in Thornton Affidavit I. Moreover, these conclusions do not comply with *456the dictates of Rule 803(10).8 Accordingly, the Court strikes this portion of Thornton Affidavit I.9
The Magistrate Judge properly refused to strike Agent Thornton’s assertion in paragraph 3 of Thornton Affidavit I that the FBI closed the Investigation in 1977. See Thornton Aff. U, 3. The Court is satisfied that Agent Thornton had personal knowledge sufficient to testify about the 1977 closing of the Investigation: Agent Thornton supervised the Investigation from 1976 to its official end in 1977, attaching the 1977 memorandum that closed the Investigation. See Thornton Aff. I, 11111, 4. Accordingly, the Magistrate Judge committed no clear error by refusing- to strike this portion of paragraph 3 in Thornton Affidavit I.
2. Paragraph 7
Plaintiffs argue that the Magistrate Judge erred in refusing to strike Agent Thornton’s statement in paragraph 7 of Thornton Affidavit I that “[b]ased on my review of [Plaintiffs’] file ... [Plaintiffs] ... were [never] the subjects of FBI electronic surveillance, nor were any breaking and entering or any other unlawful techniques used in gathering information in the [Investigation].” See Thornton Aff. I, 117. The Court agrees. The Second Circuit in United States v. Yakobov held that:
[an] assertion [about the absence of records] envisaged by Rule 803(10) is ... not a statement that the defendant has failed to perform a given act or that he does not enjoy a certain status. Rather it is a statement that, among the records regularly kept by a public office or agency, a certain record ... has not been found. This type of statement is an inferential step away from any element of the offense charged. It is not a finding of a material fact but is an assertion from which a finding of such a fact may be made.
712 F.2d 20, 26 (2d Cir.1983) (emphasis added), modified on other grounds, 728 F.2d 142 (2d Cir.1984). The Yakobov court also noted that there is no evaluative component to a Rule 803(10) statement. Id.
Agent Thornton’s testimony at issue here directly states that, based on the nonexistence of certain records, the FBI did not undertake certain activities (e.g., electronic surveillance, “breaking and entering,” and other “unlawful” actions). See Thornton Aff. 1,117. Such statements are precisely the sort of matters that fall outside the purview of 803(10). Any negative inference about the FBI’s actions based on the absence of records should be made by the trier of fact, not the agent who reviewed the files. Moreover, Agent Thornton’s testimony makes an improper legal conclusion about the Investigation, namely, whether or not the FBI employed “unlawful techniques.” Thornton Aff. I, H 7; see, e.g., Youngstown Sheet and Tube Co., 650 F.2d at 121. Accordingly, the Magistrate Judge committed clear error in her refusal to strike paragraph 7 of Thornton Affidavit I.10
3. Paragraphs 8 and 911
The Court also finds that the Magistrate Judge erred by refusing to strike para*457graphs 8 and 9 of Thornton Affidavit I. See Pis.’ Objs. at 8-9. Once again, the negative inference that the FBI did not prepare news articles or supply information to entities based on the absence of such records must be made by the trier of fact, not the reviewing agent. See Yakobov, 712 F.2d at 26. Thus, the Court finds that paragraphs 8 and 9 of Thornton Affidavit I should be stricken.
4. Paragraph 1212
The Court finds that the Magistrate Judge erred in refusing to strike the following portion of paragraph 12 of Thornton Affidavit I: “[i]nformants were used in [Plaintiffs’] investigation solely for the purpose of gathering information. None were utilized to harass or disrupt the activities of ... [Plaintiffs].” Thornton Aff. I, H12. Agent Thornton, as supervisor of the records department, could not have personal knowledge of the FBI’s reason for “using” informants over the course of the Investigation. Cf. John Hancock Property and Casualty Ins. Co. v. Universale Reinsurance Co. Ltd., 147 F.R.D. 40, 44-45 (S.D.N.Y.1993) (company’s managing director could not testify to “what [company’s] former employees would or would not have done” during negotiations under Rule 56(e)).
The Magistrate Judge also committed clear error by failing to strike the following portion of paragraph 12 in Thornton Affidavit I: “[n]or were the informants instructed or authorized to engage in illegal activity or to encourage such activity by other members of [Plaintiffs’ organization].” Thornton Aff. I, H12 (emphasis added). Agent Thornton’s testimony improperly asserts a legal conclusion, namely, that the FBI never authorized informants to engage in illegal activity. Therefore, the Court finds that the last sentence of paragraph 12 in Thornton Affidavit I should be stricken.13
B. Thornton Affidavit II
1. Paragraph 7
Plaintiffs argue that the Magistrate Judge erred in refusing to strike Agent Thornton’s statement in paragraph 7 of Thornton Affidavit II that the FBI’s Headquarters file comprises a “complete record of the ... [Investigation.” See Pis.’ Objs. at 8. The Court agrees. Such testimony improperly asserts a conclusion of ultimate fact. This is especially true in light of Plaintiffs’ *458allegations that the FBI destroyed records about its “illegal techniques” under a secret filing system and hid other records in order to avoid FOIA requests. Any inference about the completeness of the FBI files should be made by the trier of fact, not the agent who reviewed the files. Accordingly, the Magistrate Judge committed clear error in her refusal to strike this portion of paragraph 7 in Thornton Affidavit II.
The Court finds Plaintiffs’ remaining objections completely meritless and does not discuss them in this opinion.
CONCLUSION
For the foregoing reasons, the Court grants in part and denies in part Plaintiffs’ Rule 56(e) motion to strike the Thornton Affidavits.
The Court hereby strikes the following portions of Thornton Affidavit I:
• “the FBI has never reopened the investigation of the NCLC under that title, or any pretext title, nor does it have any plans to do so.” Thornton Aff. I, 118.
• “Based on my review of the NCLC file and FBI records, neither the NCLC nor any of its members were ever the subjects of FBI electronic surveillance, nor were any breaking and entering or any other unlawful techniques used in gathering information in the NCLC investigation. The occurrence of any such activities would have been recorded in the file.” Thornton Aff. 1,117.
• “The FBI had no part in the preparation of the news articles referred to in Paragraphs 31-34, 40, 71-72, 96-100, 102-103 and 118 of plaintiffs’ Second Amended Complaint. The occurrence of any such activity would have been recorded in the file.” Thornton Aff. 1,118.
• “Nor did the FBI supply information to private entities for the purpose of disrupting the NCLC as alleged in Paragraphs 42-47 and 68 of the Second Amended Complaint. The occurrence of any such activity would have been recorded in the file.” Thornton Aff. 1,119.
• “Informants were used in the NCLC investigation solely for the purpose of gathering information. None were utilized to harass or disrupt the activities of the NCLC. Nor were the informants instructed or authorized to engage in illegal activity or to encourage such activity by other members of the NCLC.” Thornton Aff. I, 1112.
The Court strikes the following portions of Thornton Affidavit II:
• “The Headquarters file of the NCLC investigation is a complete record of the NCLC investigation.” Thornton Aff. II, H 7.
• “The absence of records pertaining to any electronic surveillance of NCLC members and pertaining to surreptitious entries or other techniques directed against the NCLC and its members indicates that such activities were never authorized by the FBI and did not occur in the NCLC investigation.” Thornton Aff. II, H 8.
• “Thus, the absence of records pertaining to disruptive or harassing activities by informants indicates that such activities were not authorized by the Bureau and did not occur in the NCLC investigation.” Thornton Aff. II, 119.
The Court also strikes the following portion of Thornton Affidavit III:
• “After September of 1977, the FBI has never reopened the investigation of the NCLC under that title or any pretext title. Since the closing of that investigation none of the plaintiffs herein have been the subject of a non-criminal investigation by the FBI.” Thornton Aff. Ill, 113.
It is So Ordered.