JERRY E. SMITH, Circuit Judge:
Dana Capíes (“Capíes”) appeals a summary judgment in favor of U.S. Foodser-vice, Inc. (“USF”), and Hewitt Associates, LLC (“Hewitt”; collectively, “defendants”), alleging that defendants undermined her life insurance claim in violation of the Employee Retirement Income Security Act of 1974 (“ERISA”). Because the plan administrator relied on substantial evidence when it determined that Capíes was not the beneficiary of her deceased ex-husband’s policy, we affirm on the ground that Capíes lacks standing to sue under ERISA.
I.
Capíes married David Capíes (“Mr. Ca-píes”) in 2002. In 2004, Mr. Capíes was hired as a driver for defendant USF. As a USF employee, he was entitled to various insurance benefits, including group life insurance. When his life insurance coverage took effect in 2004, he had designated Ca-píes as his primary beneficiary and, as secondary beneficiary, his son Daniel Ca-píes (“Daniel”), who is not Caples’s biological child; he also elected spousal life insurance coverage for Capíes and child life insurance for Daniel. In February 2005, the couple separated.
Later that year, Hewitt assumed responsibility for administering USF’s benefits management system, taking over from a previous third-party manager. USF implemented a new management system and required its employees to contact Hewitt to make benefits decisions afresh. The [51]*51change in systems, coinciding with the change in system managers, meant that USF employees specifically had to elect coverage under their employer’s various benefits offerings, including life insurance; those who failed to contact Hewitt would receive no coverage. Employees had the option to designate beneficiaries for life insurance but instead could elect life insurance without designating a beneficiary, in which case the benefit would be paid to the first of the following: “(a) surviving spouse; (b) surviving child(ren) in equal shares; (c) surviving parents in equal shares; (d) surviving siblings in equal shares; (e) estate.” PRudeNtial Ins. Co. of Am., U.S. FoodserviCE, Inc.: Non-union Employees 42 (2007).
As of January 2006, Mr. Capíes had elected various coverages for himself and Daniel, including life insurance, under Hewitt’s new benefits management system. He did not elect life insurance coverage for Capíes and did not designate a beneficiary for his own life insurance.
The couple’s separation ended in divorce in March 2006. The divorce did not terminate their relationship, however: they lived together from May 2006 through January 2007, they revived their romantic relationship the following summer, and in August Mr. Capíes even proposed re-marriage. Mr. Capíes died in September 2007 of an apparent suicide.
As of his death, Mr. Capíes had elected various coverages for himself and Daniel, including life insurance; he could not elect coverage for Capíes, because she was no longer his wife. Though the couple may have renewed their relationship before Mr. Capíes died, he never designated a life insurance beneficiary after failing to do so in Hewitt’s new system. Prudential Insurance Company of America (“Prudential”), the life insurance plan administrator,1 was informed by USF through Hewitt that Mr. Capíes had died without a designated beneficiary. According to its written policy, Prudential paid $56,000 to Daniel as Mr. Caples’s sole surviving child; because of the divorce, he had no surviving spouse.
Capíes sued Prudential in state court, and Prudential removed to federal court. Capíes amended to add USF and Hewitt as defendants and dismissed Prudential. The district court then had Capíes submit her claim to Prudential for administrative review. Based on the evidence filed by all parties, Prudential found that it was correct to pay Daniel the $56,000 at issue. Her administrative remedies under ERISA exhausted, Capíes returned to the district court with her complaint; defendants renewed their motion for summary judgment. The district court granted the motion and dismissed Caples’s claims with prejudice.
II.
A summary judgment is reviewed de novo, under the same standard applied by the district court. McDaniel v. Anheuser-Busch, Inc., 987 F.2d 298, 301 (5th Cir.1998). Summary judgment is appropriate only “if the movant shows that there is no genuine dispute as to any material fact and the movant is entitled to judgment as a matter of law.” Fed.R.Civ.P. 56(a). See Anderson v. Liberty Lobby, Inc., 477 U.S. 242, 249-50, 106 S.Ct. 2505, 91 L.Ed.2d 202 [52]*52(1986). A dispute about a material fact is “genuine” if the evidence is such that a. reasonable jury could return a verdict for the non-moving party. Id. at 248, 106 S.Ct. 2505. The court must draw all justifiable inferences in favor of the non-moving party. Id. at 255, 106 S.Ct. 2505. Once the moving party has initially shown “that there is an absence of evidence to support the non-moving party’s case,” Celotex Corp. v. Catrett, 477 U.S. 317, 825, 106 S.Ct. 2548, 91 L.Ed.2d 265 (1986), the non-movant must come forward with specific facts showing a genuine factual issue for trial, Matsushita Elec. Indus. Co. v. Zenith Radio Corp., 475 U.S. 574, 587, 106 S.Ct. 1348, 89 L.Ed.2d 538 (1986). Conclu-sional allegations and denials, speculation, improbable inferences, unsubstantiated assertions, and legalistic argumentation do not adequately substitute for specific facts showing a genuine issue for trial. SEC v. Recile, 10 F.3d 1093, 1097 (5th Cir.1993).
A.
Capíes must first establish her standing to sue under ERISA. “We have recognized that standing is essential to the exercise of jurisdiction and is a ‘threshold question ... [that] determines the power of the court to entertain the suit.’ ” Coleman v. Champion Int’l Corp./Champion Forest Prods., 992 F.2d 530, 532 (5th Cir.1993) (quoting Warth v. Seldin, 422 U.S. 490, 498, 95 S.Ct. 2197, 45 L.Ed.2d 343 (1975)). ERISA gives a plan beneficiary standing to bring a civil action “to recover benefits due to him under the terms of his plan, to enforce his rights under the terms of the plan, or to clarify his rights to future benefits under the terms of the plan.” 29 U.S.C. § 1132(a)(1)(B).2 The law defines a “beneficiary” as “a person designated by a participant, or by the terms of an employee benefit plan, who is or may become entitled to a benefit thereunder.” 29 U.S.C. § 1002(8).
Capíes has standing under ERISA if she can establish that she is a beneficiary. We now turn to that question.
B.
The insurance plan in effect at Mr.
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JERRY E. SMITH, Circuit Judge:
Dana Capíes (“Capíes”) appeals a summary judgment in favor of U.S. Foodser-vice, Inc. (“USF”), and Hewitt Associates, LLC (“Hewitt”; collectively, “defendants”), alleging that defendants undermined her life insurance claim in violation of the Employee Retirement Income Security Act of 1974 (“ERISA”). Because the plan administrator relied on substantial evidence when it determined that Capíes was not the beneficiary of her deceased ex-husband’s policy, we affirm on the ground that Capíes lacks standing to sue under ERISA.
I.
Capíes married David Capíes (“Mr. Ca-píes”) in 2002. In 2004, Mr. Capíes was hired as a driver for defendant USF. As a USF employee, he was entitled to various insurance benefits, including group life insurance. When his life insurance coverage took effect in 2004, he had designated Ca-píes as his primary beneficiary and, as secondary beneficiary, his son Daniel Ca-píes (“Daniel”), who is not Caples’s biological child; he also elected spousal life insurance coverage for Capíes and child life insurance for Daniel. In February 2005, the couple separated.
Later that year, Hewitt assumed responsibility for administering USF’s benefits management system, taking over from a previous third-party manager. USF implemented a new management system and required its employees to contact Hewitt to make benefits decisions afresh. The [51]*51change in systems, coinciding with the change in system managers, meant that USF employees specifically had to elect coverage under their employer’s various benefits offerings, including life insurance; those who failed to contact Hewitt would receive no coverage. Employees had the option to designate beneficiaries for life insurance but instead could elect life insurance without designating a beneficiary, in which case the benefit would be paid to the first of the following: “(a) surviving spouse; (b) surviving child(ren) in equal shares; (c) surviving parents in equal shares; (d) surviving siblings in equal shares; (e) estate.” PRudeNtial Ins. Co. of Am., U.S. FoodserviCE, Inc.: Non-union Employees 42 (2007).
As of January 2006, Mr. Capíes had elected various coverages for himself and Daniel, including life insurance, under Hewitt’s new benefits management system. He did not elect life insurance coverage for Capíes and did not designate a beneficiary for his own life insurance.
The couple’s separation ended in divorce in March 2006. The divorce did not terminate their relationship, however: they lived together from May 2006 through January 2007, they revived their romantic relationship the following summer, and in August Mr. Capíes even proposed re-marriage. Mr. Capíes died in September 2007 of an apparent suicide.
As of his death, Mr. Capíes had elected various coverages for himself and Daniel, including life insurance; he could not elect coverage for Capíes, because she was no longer his wife. Though the couple may have renewed their relationship before Mr. Capíes died, he never designated a life insurance beneficiary after failing to do so in Hewitt’s new system. Prudential Insurance Company of America (“Prudential”), the life insurance plan administrator,1 was informed by USF through Hewitt that Mr. Capíes had died without a designated beneficiary. According to its written policy, Prudential paid $56,000 to Daniel as Mr. Caples’s sole surviving child; because of the divorce, he had no surviving spouse.
Capíes sued Prudential in state court, and Prudential removed to federal court. Capíes amended to add USF and Hewitt as defendants and dismissed Prudential. The district court then had Capíes submit her claim to Prudential for administrative review. Based on the evidence filed by all parties, Prudential found that it was correct to pay Daniel the $56,000 at issue. Her administrative remedies under ERISA exhausted, Capíes returned to the district court with her complaint; defendants renewed their motion for summary judgment. The district court granted the motion and dismissed Caples’s claims with prejudice.
II.
A summary judgment is reviewed de novo, under the same standard applied by the district court. McDaniel v. Anheuser-Busch, Inc., 987 F.2d 298, 301 (5th Cir.1998). Summary judgment is appropriate only “if the movant shows that there is no genuine dispute as to any material fact and the movant is entitled to judgment as a matter of law.” Fed.R.Civ.P. 56(a). See Anderson v. Liberty Lobby, Inc., 477 U.S. 242, 249-50, 106 S.Ct. 2505, 91 L.Ed.2d 202 [52]*52(1986). A dispute about a material fact is “genuine” if the evidence is such that a. reasonable jury could return a verdict for the non-moving party. Id. at 248, 106 S.Ct. 2505. The court must draw all justifiable inferences in favor of the non-moving party. Id. at 255, 106 S.Ct. 2505. Once the moving party has initially shown “that there is an absence of evidence to support the non-moving party’s case,” Celotex Corp. v. Catrett, 477 U.S. 317, 825, 106 S.Ct. 2548, 91 L.Ed.2d 265 (1986), the non-movant must come forward with specific facts showing a genuine factual issue for trial, Matsushita Elec. Indus. Co. v. Zenith Radio Corp., 475 U.S. 574, 587, 106 S.Ct. 1348, 89 L.Ed.2d 538 (1986). Conclu-sional allegations and denials, speculation, improbable inferences, unsubstantiated assertions, and legalistic argumentation do not adequately substitute for specific facts showing a genuine issue for trial. SEC v. Recile, 10 F.3d 1093, 1097 (5th Cir.1993).
A.
Capíes must first establish her standing to sue under ERISA. “We have recognized that standing is essential to the exercise of jurisdiction and is a ‘threshold question ... [that] determines the power of the court to entertain the suit.’ ” Coleman v. Champion Int’l Corp./Champion Forest Prods., 992 F.2d 530, 532 (5th Cir.1993) (quoting Warth v. Seldin, 422 U.S. 490, 498, 95 S.Ct. 2197, 45 L.Ed.2d 343 (1975)). ERISA gives a plan beneficiary standing to bring a civil action “to recover benefits due to him under the terms of his plan, to enforce his rights under the terms of the plan, or to clarify his rights to future benefits under the terms of the plan.” 29 U.S.C. § 1132(a)(1)(B).2 The law defines a “beneficiary” as “a person designated by a participant, or by the terms of an employee benefit plan, who is or may become entitled to a benefit thereunder.” 29 U.S.C. § 1002(8).
Capíes has standing under ERISA if she can establish that she is a beneficiary. We now turn to that question.
B.
The insurance plan in effect at Mr. Ca-ples’s death gives Prudential sole discretion to interpret the insurance contract, to make factual findings, and to determine eligibility for benefits. Prudential Ins. Co. of Am., U.S. Foodservice, Inc.: Non-union Employees 9 (2007). Under ERISA, if a plan gives discretionary authority to a plan administrator to determine beneficiaries, that factual determination is reviewed for abuse of discretion. Dutka v. AIG Life Ins. Co., 573 F.3d 210, 212 (5th Cir.2009). “In applying the abuse of discretion standard to an administrator’s factual determinations we analyze whether the administrator acted arbitrarily or capriciously.” Id. at 213. “If the determination is supported by substantial evidence, it is not arbitrary and capricious.” Id. “Substantial evidence is more than a scintilla, less than a preponderance, and is such relevant evidence as a reasonable mind might accept as adequate to support a conclusion.” Id. (internal quotation marks omitted).
C.
Applied at the summary judgment stage, ERISA’s substantial-evidence stan[53]*53dard of review for plan administrators’ factual determinations means that Capíes carries a heavy burden: She must not merely show evidence demonstrating a genuine issue as to who is the rightful beneficiary. Instead, she must show there was not substantial evidence in the administrative record supporting Prudential’s determination, such that its finding for Daniel was an abuse of discretion.3 Capíes has not carried her burden.
The evidence in the administrative record supporting Prudential’s determination is indeed substantial. In October 2005, Hewitt was retained by USF to take over USF’s employee benefits management system from the previous manager. As part of the transition, USF’s employees were required to log into Hewitt’s new automated benefits election system or call the USF benefits center administered by Hewitt; employees would no longer receive benefits if they did not contact Hewitt by a certain time. To preserve coverage, then, a USF employee had to contact Hewitt’s system, specifically elect health, life, and other insurance, and choose whether to cover himself alone or to cover family as well. Most importantly, he also had the option to designate a beneficiary for his life insurance or to leave the designation blank; Hewitt’s automated system did not force an employee to designate a beneficiary.
Hewitt’s records, as supplied to Prudential, indicate that between October 2005 and January 1, 2006, Mr. Capíes elected various insurance benefits for himself and his son, including life and health insurance. He did not choose any benefits for Capíes, however, from whom he was separated at the time and would subsequently divorce. He did not designate any beneficiary for his life insurance.
The above evidence from the administrative record is manifestly “such relevant evidence as a reasonable mind might accept as adequate to support a conclusion.” Dutka, 573 F.3d at 213 (internal quotation [54]*54marks omitted). Mr. Capíes complied with the requirement to contact Hewitt and elect insurance coverage. In contacting Hewitt, he had opportunities to choose coverage for Capíes and to designate her as his beneficiary, but he did not, unlike his choices in the benefits management system operated by Hewitt’s predecessor, in which he had Capíes-covered and designated as the primary beneficiary of his life insurance.
The difference is that, apparently, between Mr. Caples’s last contact with Hewitt’s predecessor’s system and his first contact with Hewitt’s, he and Capíes separated. Although there is no direct evidence of Mr. Caples’s knowingly deciding not to designate Capíes, the showing that he made other conscious decisions in the same benefits system, combined with the showing that Mr. Capíes had reason not to designate Capíes (namely, their separation), is indeed evidence substantial enough to support Prudential’s determination that Daniel Capíes was the proper beneficiary.
Caples’s proffered evidence complicates defendants’ showing slightly but comes nowhere close to demonstrating that defendants have failed to show that the plan administrator’s beneficiary determination was supported by substantial evidence, even when Caples’s evidence is viewed in the most favorable light possible.4 Capíes offers three major attacks on the weight of the evidence: the designation of Capíes in the (discontinued) pre-Hewitt system; the absence of evidence directly demonstrating that Mr. Capíes consciously declined to designate Capíes when using Hewitt’s system; and defendants’ failure to corroborate the sworn affidavits of their records custodians.
At most, these could be read to demonstrate, respectively, that defendants did not transmit Mr. Caples’s outdated designation of Capíes; Mr. Capíes did not deliberately decline to designate Capíes; and defendants have not done everything possible to eradicate doubt about Mr. Caples’s responsibility for the records. But these putative showings do not impugn the latest electronic records generated by Mr. Ca-ples’s interaction with Hewitt’s benefits system as doing something other than genuinely recording his insurance choices and non-choices.
Crucially, Capíes has given the court no reason why the electronic records offered by defendants, included in the administrative record, are not “such relevant evidence as a reasonable mind might accept as adequate to support a conclusion.” Dutka, 573 F.3d at 213 (internal quotation marks omitted). The defendants have shown that there was evidence in the administrative record substantial enough to make Prudential’s ultimate determination reasonable. Capíes has not shown otherwise.
III.
Given Prudential’s decision, supported by substantial evidence, that Daniel is the rightful beneficiary of Mr. Caples’s life insurance benefits, Capíes is not a beneficiary under ERISA. Consequently, she lacks standing to bring a civil action under § 1132(a)(1)(B), under theories of [55]*55breach of contract/fiduciary duty, negligence, or anything else.5
AFFIRMED.
Pursuant to 5th Cir. R. 47.5, the court has determined that this opinion should not be published and is not precedent except under the limited circumstances set forth in 5th Cir. R. 47.5.4.