| TCG Crossover GP II, LLC |
SRZN |
Common Stock |
Purchase |
0.18% |
$29,733 |
$24.99 |
1,190 |
675,613 |
16 Mar 2026 |
See footnote |
| TCG Crossover GP II, LLC |
SRZN |
Common Stock |
Purchase |
5.54% |
$881,463 |
$24.88 |
35,433 |
675,018 |
13 Mar 2026 |
See footnote |
| TCG Crossover GP II, LLC |
SRZN |
Common Stock |
Purchase |
1.92% |
$309,166 |
$24.99 |
12,374 |
657,301 |
12 Mar 2026 |
See footnote |
| Yang Li |
SRZN |
Restricted Stock Unit |
Award |
|
|
|
100,950 |
100,950 |
17 Feb 2026 |
Direct |
| Yang Li |
SRZN |
Employee Stock Option (right to buy) |
Award |
|
|
|
100,950 |
100,950 |
17 Feb 2026 |
Direct |
| Williams Charles O |
SRZN |
Restricted Stock Unit |
Award |
|
|
|
102,900 |
102,900 |
17 Feb 2026 |
Direct |
| Williams Charles O |
SRZN |
Employee Stock Option (right to buy) |
Award |
|
|
|
102,900 |
102,900 |
17 Feb 2026 |
Direct |
| Craig C. Parker |
SRZN |
Restricted Stock Unit |
Award |
|
|
|
242,200 |
242,200 |
17 Feb 2026 |
Direct |
| Craig C. Parker |
SRZN |
Employee Stock Option (right to buy) |
Award |
|
|
|
242,200 |
242,200 |
17 Feb 2026 |
Direct |
| TCG Crossover GP II, LLC |
SRZN |
Common Stock |
Purchase |
0.17% |
$26,082 |
$23.86 |
1,093 |
651,114 |
12 Feb 2026 |
See footnote |
| TCG Crossover GP II, LLC |
SRZN |
Common Stock |
Purchase |
2.81% |
$418,763 |
$23.58 |
17,763 |
650,567 |
11 Feb 2026 |
See footnote |
| TCG Crossover GP II, LLC |
SRZN |
Common Stock |
Purchase |
0.68% |
$95,549 |
$21.94 |
4,355 |
641,685 |
03 Feb 2026 |
See footnote |
| TCG Crossover GP II, LLC |
SRZN |
Common Stock |
Purchase |
0.11% |
$15,629 |
$21.38 |
731 |
639,507 |
02 Feb 2026 |
See footnote |
| TCG Crossover GP II, LLC |
SRZN |
Common Stock |
Purchase |
0.67% |
$91,357 |
$21.39 |
4,271 |
639,141 |
30 Jan 2026 |
See footnote |
| Williams Charles O |
SRZN |
Employee Stock Option (right to buy) |
Award |
|
|
|
500 |
500 |
23 Jan 2026 |
Direct |
| Column Group III Gp, Lp |
SRZN |
Common Stock |
Purchase |
0.95% |
$187,532 |
$19.60 |
9,568 |
1,016,658 |
20 Jan 2026 |
By The Column Group III-A, LP |
| Column Group III Gp, Lp |
SRZN |
Common Stock |
Purchase |
0.95% |
$166,286 |
$19.60 |
8,484 |
900,292 |
20 Jan 2026 |
By The Column Group III, LP |
| Tim Kutzkey |
SRZN |
Common Stock |
Purchase |
0.95% |
$187,532 |
$19.60 |
9,568 |
1,016,658 |
20 Jan 2026 |
By The Column Group III-A, LP |
| Tim Kutzkey |
SRZN |
Common Stock |
Purchase |
0.95% |
$166,286 |
$19.60 |
8,484 |
900,292 |
20 Jan 2026 |
By The Column Group III, LP |
| Column Group III Gp, Lp |
SRZN |
Common Stock |
Purchase |
0.14% |
$27,160 |
$20.00 |
1,358 |
1,007,090 |
16 Jan 2026 |
By The Column Group III-A, LP |
| Column Group III Gp, Lp |
SRZN |
Common Stock |
Purchase |
0.14% |
$24,080 |
$20.00 |
1,204 |
891,808 |
16 Jan 2026 |
By The Column Group III, LP |
| Tim Kutzkey |
SRZN |
Common Stock |
Purchase |
0.14% |
$27,160 |
$20.00 |
1,358 |
1,007,090 |
16 Jan 2026 |
By The Column Group III-A, LP |
| Tim Kutzkey |
SRZN |
Common Stock |
Purchase |
0.14% |
$24,080 |
$20.00 |
1,204 |
891,808 |
16 Jan 2026 |
By The Column Group III, LP |
| Column Group III Gp, Lp |
SRZN |
Common Stock |
Purchase |
0.63% |
$125,360 |
$19.89 |
6,303 |
1,005,732 |
15 Jan 2026 |
By The Column Group III-A, LP |
| Column Group III Gp, Lp |
SRZN |
Common Stock |
Purchase |
0.63% |
$111,180 |
$19.89 |
5,590 |
890,604 |
15 Jan 2026 |
By The Column Group III, LP |
| Tim Kutzkey |
SRZN |
Common Stock |
Purchase |
0.63% |
$125,360 |
$19.89 |
6,303 |
1,005,732 |
15 Jan 2026 |
By The Column Group III-A, LP |
| Tim Kutzkey |
SRZN |
Common Stock |
Purchase |
0.63% |
$111,180 |
$19.89 |
5,590 |
890,604 |
15 Jan 2026 |
By The Column Group III, LP |
| Tim Kutzkey |
SRZN |
Common Stock |
Purchase |
0.29% |
$58,506 |
$19.99 |
2,927 |
999,429 |
14 Jan 2026 |
By The Column Group III-A, LP |
| Tim Kutzkey |
SRZN |
Common Stock |
Purchase |
0.29% |
$51,890 |
$19.99 |
2,596 |
885,014 |
14 Jan 2026 |
By The Column Group III, LP |
| Column Group III Gp, Lp |
SRZN |
Common Stock |
Purchase |
0.29% |
$58,506 |
$19.99 |
2,927 |
999,429 |
14 Jan 2026 |
By The Column Group III-A, LP |
| Column Group III Gp, Lp |
SRZN |
Common Stock |
Purchase |
0.29% |
$51,890 |
$19.99 |
2,596 |
885,014 |
14 Jan 2026 |
By The Column Group III, LP |
| Tim Kutzkey |
SRZN |
Common Stock |
Purchase |
0.67% |
$130,885 |
$19.80 |
6,609 |
996,502 |
13 Jan 2026 |
By The Column Group III-A, LP |
| Tim Kutzkey |
SRZN |
Common Stock |
Purchase |
0.67% |
$116,072 |
$19.80 |
5,861 |
882,418 |
13 Jan 2026 |
By The Column Group III, LP |
| Column Group III Gp, Lp |
SRZN |
Common Stock |
Purchase |
0.67% |
$130,885 |
$19.80 |
6,609 |
996,502 |
13 Jan 2026 |
By The Column Group III-A, LP |
| Column Group III Gp, Lp |
SRZN |
Common Stock |
Purchase |
0.67% |
$116,072 |
$19.80 |
5,861 |
882,418 |
13 Jan 2026 |
By The Column Group III, LP |
| Column Group III Gp, Lp |
SRZN |
Common Stock |
Purchase |
0.82% |
$159,157 |
$19.89 |
8,003 |
989,893 |
06 Jan 2026 |
By The Column Group III-A, LP |
| Column Group III Gp, Lp |
SRZN |
Common Stock |
Purchase |
0.82% |
$141,139 |
$19.89 |
7,097 |
876,557 |
06 Jan 2026 |
By The Column Group III, LP |
| Tim Kutzkey |
SRZN |
Common Stock |
Purchase |
0.82% |
$159,157 |
$19.89 |
8,003 |
989,893 |
06 Jan 2026 |
By The Column Group III-A, LP |
| Tim Kutzkey |
SRZN |
Common Stock |
Purchase |
0.82% |
$141,139 |
$19.89 |
7,097 |
876,557 |
06 Jan 2026 |
By The Column Group III, LP |
| Yang Li |
SRZN |
Common Stock |
Sale |
-6.5% |
$22,209 |
$19.87 |
-1,118 |
16,091 |
05 Jan 2026 |
Direct |
| Williams Charles O |
SRZN |
Common Stock |
Sale |
-10.8% |
$31,109 |
$19.87 |
-1,566 |
12,982 |
05 Jan 2026 |
Direct |
| Yang Li |
SRZN |
Common Stock |
Options Exercise |
17% |
|
|
2,500 |
17,209 |
02 Jan 2026 |
Direct |
| Yang Li |
SRZN |
Restricted Stock Units |
Options Exercise |
-100% |
|
|
-2,500 |
0 |
02 Jan 2026 |
Direct |
| Williams Charles O |
SRZN |
Common Stock |
Options Exercise |
31.7% |
|
|
3,500 |
14,548 |
02 Jan 2026 |
Direct |
| Williams Charles O |
SRZN |
Restricted Stock Units |
Options Exercise |
-100% |
|
|
-3,500 |
0 |
02 Jan 2026 |
Direct |
| Yang Li |
SRZN |
Common Stock |
Award |
12.8% |
|
|
1,666 |
14,709 |
15 Dec 2025 |
Direct |
| Williams Charles O |
SRZN |
Common Stock |
Award |
17.8% |
|
|
1,666 |
11,048 |
15 Dec 2025 |
Direct |
| Craig C. Parker |
SRZN |
Common Stock |
Award |
22.1% |
|
|
1,553 |
8,577 |
15 Dec 2025 |
Direct |
| Tim Kutzkey |
SRZN |
Common Stock |
Purchase |
1.7% |
$320,099 |
$19.54 |
16,381 |
981,890 |
05 Dec 2025 |
By The Column Group III-A, LP |
| Tim Kutzkey |
SRZN |
Common Stock |
Purchase |
1.7% |
$283,402 |
$19.54 |
14,503 |
869,460 |
05 Dec 2025 |
By The Column Group III, LP |