TANDEM DIABETES CARE INC - Common Stock, par value $0.001 per share (TNDM)

Historical Holders from Q1 2016 to Q3 2025

Symbol: TNDM on Nasdaq
Type / Class: Equity / Common Stock, par value $0.001 per share
Shares outstanding: 67,604,359
All holders as of 30 Sep 2025: Q3 2025
Total 13F shares, excl. options: 74,859,225
Holdings value: $908,623,740
% of all portfolios: 0.002%
Number of holders: 248
Number of buys: 112
Number of sells: -153
Average buys %: +0%
Average sells %: -0%

Reported Shares, Excluding Options vs Price

Reported Value, Excluding Options

Total Investors

Significant Owners of TANDEM DIABETES CARE INC - Common Stock, par value $0.001 per share (TNDM)

Filer	Ownership	Holdings Value	Nb Shares	Reporting Name	Report Period
BlackRock, Inc.	15.2%	$176,563,735	10,106,682	BlackRock, Inc.	31 Mar 2025
Sessa Capital (Master), L.P.	6.71%	$78,026,383	4,466,307	Sessa Capital (Master), L.P.	31 Mar 2025
ArrowMark Colorado Holdings LLC	5.46%	$44,811,144	3,691,198	ArrowMark Colorado Holdings, LLC	30 Sep 2025

Institutional Holders of TANDEM DIABETES CARE INC - Common Stock, par value $0.001 per share (TNDM)

Period	Reported Shares, Excl. Options	Value, Excl. Options	Change	Puts Notional Value	Calls Notional Value	Price	Investors
2025 Q3	74,859,225	$908,623,740	-$138,978,063	$4,553,985	$35,820,729	$12.14	248
2025 Q2	80,970,548	$1,506,919,626	+$146,515,993	$2,499,106	$53,576,444	$18.64	269
2025 Q1	73,028,420	$1,399,471,204	-$74,262,859	$3,036,860	$59,785,178	$19.16	271
2024 Q4	72,082,680	$2,596,593,509	-$54,203,387	$6,533,539	$112,167,370	$36.02	311
2024 Q3	73,070,303	$3,098,544,283	-$23,063,732	$9,707,897	$142,558,575	$42.41	326
2024 Q2	73,624,715	$2,966,330,226	-$12,633,640	$13,815,441	$125,681,109	$40.29	315
2024 Q1	74,163,562	$2,626,695,815	+$150,901,685	$8,838,336	$115,094,020	$35.41	290
2023 Q4	70,841,842	$2,095,507,190	+$47,113,352	$17,393,040	$9,714,072	$29.58	264
2023 Q3	69,587,644	$1,445,242,152	+$40,169,385	$6,006,684	$6,390,929	$20.77	224
2023 Q2	67,061,755	$1,645,737,206	-$59,226,945	$4,262,598	$2,888,358	$24.54	242
2023 Q1	68,103,120	$2,765,613,824	+$144,781,126	$3,780,791	$4,840,712	$40.61	270
2022 Q4	64,356,332	$2,890,283,528	+$83,553,842	$8,158,450	$17,018,245	$44.95	290
2022 Q3	62,774,623	$3,005,075,951	-$3,660,996	$18,285,000	$15,374,000	$47.85	279
2022 Q2	61,447,968	$3,637,020,281	-$76,699,636	$11,250,000	$36,868,000	$59.19	317
2022 Q1	59,516,284	$6,922,056,028	-$138,240,750	$23,702,000	$53,621,000	$116.29	365
2021 Q4	60,391,589	$9,087,447,171	-$2,104,121	$69,290,000	$92,762,000	$150.52	376
2021 Q3	61,294,210	$7,318,019,845	+$274,585,725	$61,858,000	$65,026,000	$119.38	331
2021 Q2	59,035,893	$5,750,025,560	+$205,481,616	$31,648,000	$72,643,000	$97.4	295
2021 Q1	57,554,702	$5,079,400,953	-$46,897,671	$41,374,000	$57,568,000	$88.25	282
2020 Q4	58,469,670	$5,594,436,203	+$259,885,627	$58,186,936	$105,805,640	$95.68	295
2020 Q3	54,610,664	$6,195,906,490	-$74,521,157	$90,323,000	$159,110,000	$113.5	317
2020 Q2	55,340,731	$5,467,195,169	+$30,463,584	$63,149,000	$118,179,000	$98.92	298
2020 Q1	55,943,514	$3,597,678,709	+$179,201,893	$34,033,000	$33,227,000	$64.35	272
2019 Q4	54,323,826	$3,238,388,302	+$215,522,474	$37,073,000	$38,276,000	$59.61	277
2019 Q3	49,570,173	$2,923,699,368	+$150,187,596	$51,927,000	$53,641,000	$58.98	265
2019 Q2	46,969,436	$3,030,219,186	+$32,868,289	$48,941,000	$89,996,000	$64.52	257
2019 Q1	46,852,382	$2,975,069,325	-$42,975,705	$46,082,000	$70,307,000	$63.5	259
2018 Q4	47,679,245	$1,810,642,238	+$238,092,658	$30,608,000	$44,873,000	$37.97	197
2018 Q3	41,283,497	$1,768,571,420	+$363,867,902	$35,926,000	$75,976,000	$42.84	180
2018 Q2	33,358,770	$734,537,970	+$323,358,099	$9,623,000	$12,100,000	$22.02	114
2018 Q1	21,326,200	$105,775,575	+$86,906,889		$4,464,000	$4.96	72
2017 Q4	1,658,886	$3,911,007	-$15,365,244		$2,124,000	$2.36	29
2017 Q3	8,179,498	$5,969,000	+$5,969,000			$0.7277	4
2016 Q2	0	$0	-$10,000				0
2016 Q1	150	$10,000				$66.67	1