Estimated market cap $3.92BShares outstanding from the company’s latest SEC filing (all share classes, each priced at its own close; ADRs converted to ADS) × last close from Tiingo. Updated daily. This figure: shares as of Dec 31, 2025, last close Nov 13, 2026.296.72M shares, shares as of Dec 31, 2025CIK 1144800The SEC’s Central Index Key, the number it uses to identify every company and person that files.
Insider trades, 12 mo
—
No open-market trades
Congress trades, 24 mo
—
No disclosed trades
13F holders
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Lobbying, 12 mo
—
No lobbying filings
Federal contracts, 12 mo
—
None matched
Ask your AI:
Latest 10-Q
What changed in TransAlta Corporation's latest quarterly report, compared with the one before.
We have not read a recent 10-Q for this company yet.
Insider trades
Open-market trades from Form 4. 10b5-1 marks a plan set in advance.Open-market buys and sales by officers, directors and 10% owners, from SEC Form 4. A plan set in advance is marked 10b5-1.
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13F holders
Funds that report this stock, checked against market prices.Fund managers with over $100 million in US-listed stocks file a 13F each quarter, up to 45 days after quarter end. Long positions only.
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Top 10 holders.Premium lists every holder, with CSV downloads.
Disclosed in dollar ranges, up to 45 days after the trade.Members of Congress, their spouses and dependent children report trades in dollar ranges, up to 45 days after the trade.
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Lobbying
What TransAlta Corporation and its lobbying firms report each quarter.A company that lobbies with its own staff reports its expenses; a lobbying firm it hires reports the income it received. We count both.
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Institutional ownership over time
How many funds reported holding the stock at the end of each quarter, and how many shares they held between them.
13F holders, Q3 2026Fund managers with over $100 million in US-listed stocks file a 13F each quarter, up to 45 days after quarter end. Long positions only.
111
53 added · 30 trimmed
Insider trades
Open-market trades from Form 4. 10b5-1 marks a plan set in advance.Open-market buys and sales by officers, directors and 10% owners, from SEC Form 4. A plan set in advance is marked 10b5-1.
No recent insider purchases or sales for this company.
13F holders
101.49M shares
111 funds report TAC. Values checked against market prices.Fund managers with over $100 million in US-listed stocks file a 13F each quarter, up to 45 days after quarter end. Long positions only.
Funds own 80% of shares (Q2 2026)Fund managers with more than $100 million in US-listed stocks file a 13F each quarter. It lists their long stock positions only (shorts, options and bonds are left out) and can arrive up to 45 days after the quarter ends, so this is a snapshot of the quarter end. We add up the shares every fund reports in this class and divide by the shares outstanding. The total can pass 100%: the same shares are often reported by more than one manager (an adviser and the fund it runs), lent shares can be reported twice, and the share count can be out of date after buybacks. We divided 236.94M reported shares by 296.72M shares, from the cover page of the company’s filing as of Dec 31, 2025.
176 funds hold the stock.
Q3 2026: 34% · 5,560 of ~8,900 funds reported so farFunds have 45 days after a quarter ends to file. This quarter’s reports are still arriving, so the figure only counts the funds that have filed so far and will usually rise.
Q2 202587%
Q3 202576%
Q4 202574%
Q1 202673%
Q2 202680%
Q3 2026 (so far)34%
Q3 2026. 12 new, 53 added to, 30 trimmed, 78 exited since Q2 2026.
Download CSVEvery fund that holds TAC, not only these ten. A download holds at most 10,000 rows; narrow the filters to get a smaller slice.
Trades by members of Congress
Disclosed in dollar ranges, up to 45 days after the trade.Members of Congress, their spouses and dependent children report trades in dollar ranges, up to 45 days after the trade.
No recent congressional trades for this company.
Lobbying
What TransAlta Corporation and its lobbying firms report each quarter.A company that lobbies with its own staff reports its expenses; a lobbying firm it hires reports the income it received. We count both.
No recent lobbying filings for this company.
Institutional ownership over time
How many funds reported holding the stock at the end of each quarter, and how many shares they held between them.
Funds holding the stock
Shares they report
Funds holding the stock by quarter
Q2 2013
102
—
124.40M
$1.7B
Q3 2013
99
-3
130.00M
$1.7B
Q4 2013
97
-2
118.29M
$1.5B
Q1 2014
106
+9
122.15M
$1.4B
Q2 2014
118
+12
123.66M
$1.5B
Q3 2014
116
-2
125.91M
$1.3B
Q4 2014
110
-6
124.91M
$1.1B
Q1 2015
118
+8
135.48M
$1.3B
Q2 2015
110
-8
131.75M
$1.0B
Q3 2015
112
+2
146.43M
$686.1M
Q4 2015
93
-19
141.26M
$508.0M
Q1 2016
84
-9
118.09M
$555.1M
Q2 2016
88
+4
120.60M
$628.2M
Q3 2016
86
-2
129.37M
$576.4M
Q4 2016
89
+3
140.74M
$777.5M
Q1 2017
91
+2
142.69M
$839.2M
Q2 2017
87
-4
145.98M
$938.3M
Q3 2017
83
-4
146.61M
$860.2M
Q4 2017
82
-1
153.04M
$914.1M
Q1 2018
86
+4
160.20M
$872.1M
Q2 2018
79
-7
159.84M
$804.8M
Q3 2018
83
+4
151.86M
$858.0M
Q4 2018
74
-9
137.20M
$566.0M
Q1 2019
80
+6
142.33M
$1.0B
Q2 2019
80
0
133.30M
$868.2M
Q3 2019
80
0
136.38M
$889.8M
Q4 2019
81
+1
148.72M
$1.1B
Q1 2020
92
+11
168.72M
$881.5M
Q2 2020
86
-6
161.96M
$962.6M
Q3 2020
84
-2
158.42M
$980.6M
Q4 2020
87
+3
157.65M
$1.2B
Q1 2021
83
-4
162.45M
$1.6B
Q2 2021
89
+6
164.17M
$1.6B
Q3 2021
93
+4
167.83M
$1.8B
Q4 2021
104
+11
168.67M
$1.9B
Q1 2022
99
-5
168.62M
$1.8B
Q2 2022
101
+2
170.69M
$2.0B
Q3 2022
103
+2
175.04M
$1.6B
Q4 2022
109
+6
175.79M
$1.6B
Q1 2023
110
+1
174.80M
$1.5B
Q2 2023
127
+17
175.85M
$1.7B
Q3 2023
123
-4
177.75M
$1.6B
Q4 2023
137
+14
184.74M
$1.5B
Q1 2024
139
+2
183.10M
$1.2B
Q2 2024
141
+2
181.57M
$1.3B
Q3 2024
156
+15
186.52M
$1.9B
Q4 2024
184
+28
243.89M
$3.5B
Q1 2025
163
-21
272.38M
$2.5B
Q2 2025
168
+5
258.65M
$2.8B
Q3 2025
162
-6
224.99M
$3.1B
Q4 2025
172
+10
218.89M
$2.8B
Q1 2026
178
+6
217.41M
$2.9B
Q2 2026
177
-1
236.94M
$3.3B
Q3 2026
111
-66
101.49M
$1.2B
Each point is a quarter-end, from Q2 2013 to Q3 2026. A fund's 13F lists its long positions in US-listed securities as of the last day of the quarter and arrives up to 45 days later, so each point shows holdings at quarter-end, not on the day they were reported.
Common shares only; options and bonds are left out. When a fund amends a report, the amended version is the one counted.
The history follows the company's current CUSIP number (89346D107). If the company's shares were ever re-issued under a different CUSIP, the quarters before the change are not part of this series, so the first point (Q2 2013) can be later than the stock's first appearance in 13F reports.
Share counts are adjusted for stock splits; none took place between these quarters. Values are in dollars as reported at the time and are not adjusted.
A quarter appears once our daily update has built its summary. If a summary cannot be built, older reports are kept and the chart shows the quarters it has until the next update repairs it.