There is a long list of 89 institutional holders of UP within the last two holding periods in our database of 13F filers, so we've sorted through to present to you just the top 50 institutional holders of UP by largest to smallest position reported in the institutional investor's latest 13F filing. In the institutional-holders-of-UP table below, the initial column indicates the name of each top institutional holder of UP, with a link to that fund's top holdings. The next columns indicate the amount of UP stock held by each of the institutional holders of UP, followed by the UP position size held by the institution, and finally the date of the quarterly 13F filing period the holdings data represents for that institution.

Holder	Amount	Position Size ($ in 1000's)	As of
Delta Air Lines Inc.	263,369,307	$903,357	12/31/2023
UP	263,369,307	$903,357	12/31/2023
Knighthead Capital Management LLC	258,169,208	$885,520	12/31/2023
UP	258,169,208	$885,520	12/31/2023
Kore Advisors LP	25,816,921	$88,552	12/31/2023
UP	25,816,921	$88,552	12/31/2023
Vanguard Group Inc.	5,004,355	$17,165	12/31/2023
UP	5,004,355	$17,165	12/31/2023
Millennium Management LLC	458,376	$1,572	12/31/2023
UP	458,376	$1,572	12/31/2023
BlackRock Inc.	243,082	$834	12/31/2023
UP	243,082	$834	12/31/2023
Barclays PLC	192,000	$659	12/31/2023
UP	192,000	$659	12/31/2023
Walleye Capital LLC	164,545	$564	12/31/2023
UP	164,545	$564	12/31/2023
Instrumental Wealth LLC	156,305	$531	12/31/2023
UP	156,305	$531	12/31/2023
Geode Capital Management LLC	152,873	$525	12/31/2023
UP	152,873	$525	12/31/2023
Morgan Stanley	140,534	$482	12/31/2023
UP	140,534	$482	12/31/2023
Renaissance Technologies LLC	140,270	$481	12/31/2023
UP	140,270	$481	12/31/2023
Mariner LLC	139,814	$480	12/31/2023
UP	139,814	$480	12/31/2023
EntryPoint Capital LLC	115,784	$397	12/31/2023
UP	115,784	$397	12/31/2023
FMR LLC	112,106	$385	12/31/2023
UP	112,106	$385	12/31/2023
Jefferies Financial Group Inc.		$376	12/31/2023
Call	109,700	$376	12/31/2023
NEA Management Company LLC	106,126	$364	12/31/2023
UP	106,126	$364	12/31/2023
Invesco Ltd.	93,916	$322	12/31/2023
UP	93,916	$322	12/31/2023
Northern Trust Corp	87,614	$301	12/31/2023
UP	87,614	$301	12/31/2023
CCG Wealth Management LLC	100,000	$287	03/31/2024
UP	100,000	$287	03/31/2024
Capital Impact Advisors LLC	79,930	$274	12/31/2023
UP	79,930	$274	12/31/2023
Group One Trading L.P.		$246	12/31/2023
Call	102,600	$352	12/31/2023
Put	31,000	$106	12/31/2023
State Street Corp	68,587	$235	12/31/2023
UP	68,587	$235	12/31/2023
Jane Street Group LLC	68,048	$233	12/31/2023
UP	68,048	$233	12/31/2023
Y Intercept Hong Kong Ltd	67,580	$232	12/31/2023
UP	67,580	$232	12/31/2023
Mirabella Financial Services LLP	61,400	$211	12/31/2023
UP	61,400	$211	12/31/2023
Cubist Systematic Strategies LLC	57,202	$196	12/31/2023
UP	57,202	$196	12/31/2023
CVA Family Office LLC	60,850	$175	03/31/2024
UP	60,850	$175	03/31/2024
Dimensional Fund Advisors LP	47,217	$162	12/31/2023
UP	47,217	$162	12/31/2023
Cannon Global Investment Management LLC	50,500	$145	03/31/2024
UP	50,500	$145	03/31/2024
Citadel Advisors LLC		$94	12/31/2023
Call	50,620	$174	12/31/2023
Put	23,210	$80	12/31/2023
UMB Bank N A MO	26,660	$91	12/31/2023
UP	26,660	$91	12/31/2023
Bank of America Corp DE	24,533	$84	12/31/2023
UP	24,533	$84	12/31/2023
Tower Research Capital LLC TRC	23,279	$80	12/31/2023
UP	23,279	$80	12/31/2023
Commonwealth Equity Services LLC	23,104	$79	12/31/2023
UP	23,104	$79	12/31/2023
Bank of New York Mellon Corp	22,690	$78	12/31/2023
UP	22,690	$78	12/31/2023
Virtu Financial LLC	21,247	$73	12/31/2023
UP	21,247	$73	12/31/2023
Cetera Advisor Networks LLC	20,960	$72	12/31/2023
UP	20,960	$72	12/31/2023
Arcus Capital Partners LLC	24,495	$70	03/31/2024
UP	24,495	$70	03/31/2024
MSD Partners L.P.	20,000	$69	12/31/2023
UP	20,000	$69	12/31/2023
Baird Financial Group Inc.	20,030	$69	12/31/2023
UP	20,030	$69	12/31/2023
LPL Financial LLC	16,619	$57	12/31/2023
UP	16,619	$57	12/31/2023
Audent Global Asset Management LLC	16,209	$56	12/31/2023
UP	16,209	$56	12/31/2023
JPMorgan Chase & Co.	16,034	$55	12/31/2023
UP	16,034	$55	12/31/2023
Annex Advisory Services LLC	18,471	$53	03/31/2024
UP	18,471	$53	03/31/2024
MAI Capital Management	13,995	$48	12/31/2023
UP	13,995	$48	12/31/2023
Two Sigma Securities LLC	14,078	$48	12/31/2023
UP	14,078	$48	12/31/2023
Compass Ion Advisors LLC	15,562	$45	03/31/2024
UP	15,562	$45	03/31/2024
Stratos Wealth Partners LTD.	15,265	$44	03/31/2024
UP	15,265	$44	03/31/2024
Two Sigma Advisers LP	12,499	$43	12/31/2023
UP	12,499	$43	12/31/2023