% Generated by code/make_tables.py from results/timeseries/first\_seen\_fixed\_cohort.csv, summary.json. Do not edit by hand.
\begin{table}[H]
\centering\scriptsize
\setlength{\tabcolsep}{3pt}
\caption{Mentions and projects first seen by filing year: all issuers versus a fixed issuer cohort and windowed keys}\label{tab:timeseries_cohort}
\begin{threeparttable}
\begin{adjustbox}{max width=\textwidth}
\begin{tabular}{lrrrrrrrrr}
\toprule
 & \multicolumn{5}{c}{All issuers filing in the year} & \multicolumn{4}{c}{Fixed cohort: issuers filing in every year 2010--2025} \\
\cmidrule(lr){2-6}\cmidrule(lr){7-10}
Year & Issuers & \multicolumn{1}{c}{\makecell{Mentions\\per issuer}} & \multicolumn{1}{c}{\makecell{First seen\\(current key)}} & \multicolumn{1}{c}{\makecell{First seen\\($k = 3$)}} & \multicolumn{1}{c}{\makecell{First seen\\($k = 5$)}} & Issuers & \multicolumn{1}{c}{\makecell{Mentions\\per issuer}} & \multicolumn{1}{c}{\makecell{First seen\\(current key)}} & \multicolumn{1}{c}{\makecell{First seen\\per issuer}} \\
\midrule
2010$^{a}$ & 1{,}392 & 8.6 & 7{,}835 & 7{,}835 & 7{,}835 & 1{,}389 & 8.6 & 7{,}819 & 5.6 \\
2011 & 1{,}424 & 9.5 & 6{,}679 & 6{,}679 & 6{,}679 & 1{,}389 & 9.6 & 6{,}533 & 4.7 \\
2012 & 1{,}472 & 9.7 & 6{,}444 & 6{,}444 & 6{,}444 & 1{,}389 & 9.9 & 6{,}125 & 4.4 \\
2013 & 1{,}539 & 9.5 & 6{,}286 & 6{,}385 & 6{,}286 & 1{,}389 & 9.7 & 5{,}602 & 4.0 \\
2014 & 1{,}619 & 10.1 & 6{,}732 & 7{,}004 & 6{,}732 & 1{,}389 & 10.1 & 5{,}583 & 4.0 \\
2015 & 1{,}689 & 10.1 & 6{,}675 & 7{,}092 & 6{,}734 & 1{,}389 & 10.1 & 5{,}288 & 3.8 \\
2016 & 1{,}744 & 9.4 & 6{,}240 & 6{,}710 & 6{,}372 & 1{,}389 & 9.4 & 4{,}810 & 3.5 \\
2017 & 1{,}810 & 9.6 & 6{,}490 & 7{,}120 & 6{,}725 & 1{,}389 & 9.4 & 4{,}674 & 3.4 \\
2018 & 1{,}893 & 9.5 & 6{,}815 & 7{,}529 & 7{,}115 & 1{,}389 & 9.4 & 4{,}719 & 3.4 \\
2019 & 1{,}973 & 9.5 & 6{,}837 & 7{,}644 & 7{,}208 & 1{,}389 & 9.3 & 4{,}496 & 3.2 \\
2020 & 2{,}089 & 8.6 & 7{,}212 & 8{,}010 & 7{,}649 & 1{,}389 & 8.2 & 4{,}380 & 3.2 \\
2021 & 2{,}247 & 9.5 & 8{,}216 & 9{,}191 & 8{,}732 & 1{,}389 & 8.9 & 4{,}505 & 3.2 \\
2022 & 2{,}291 & 9.9 & 8{,}158 & 9{,}135 & 8{,}689 & 1{,}389 & 9.3 & 4{,}447 & 3.2 \\
2023 & 2{,}329 & 9.9 & 7{,}977 & 9{,}061 & 8{,}557 & 1{,}389 & 9.1 & 4{,}251 & 3.1 \\
2024 & 2{,}387 & 9.4 & 7{,}819 & 8{,}954 & 8{,}500 & 1{,}389 & 8.8 & 4{,}085 & 2.9 \\
2025 & 2{,}453 & 9.5 & 7{,}990 & 9{,}252 & 8{,}719 & 1{,}389 & 8.8 & 3{,}926 & 2.8 \\
2026$^{b}$ & 2{,}498 & 7.6 & 6{,}694 & 7{,}778 & 7{,}342 & 1{,}389 & 7.1 & 3{,}192 & 2.3 \\
\bottomrule
\end{tabular}
\end{adjustbox}
\begin{tablenotes}\footnotesize
\item $^{a}$Left-censored year (a project under way before the corpus start is first seen at its first in-window filing); $^{b}$partial year (filings to 2026-10-27). ``First seen'' counts projects whose earliest mention falls in the year; the windowed keys split a current-key project into episodes whenever the gap between consecutive mentions exceeds $k$ years (131{,}823 episodes at $k = 3$ and 126{,}318 at $k = 5$ against 121{,}099 projects). The fixed cohort holds the issuer composition constant: its mentions per issuer are flat while its new projects per issuer fall, which is consistent with a time-invariant key attaching later mentions to existing projects, with a change in disclosure, or with both; the series do not discriminate between these readings.
\end{tablenotes}
\end{threeparttable}
\end{table}