Stocks › COLL

Collegium Pharmaceutical COLL

US equityMarket cap rank #3524

$21.97 +$0.04 (+0.18%)

Market open · Oct 8, 10:00 am ET · After hours $21.93 0.00%

Open$22.03

Prev close$21.93

Day range$21.80 – $22.03

Volume32.5K

Market cap$681.05M

P/E (TTM)17.3

Dividend yield–

Ownership & positioning

Who holds it, who is betting against it, and where the big money is moving

Institutional ownership126.8%+1.26 pts vs. prior quarter

Institutions holding340-1 vs. prior quarter

Insider trades (recent)19 buys / 30 sellsNet selling

Short interest18.31% of floatDays to cover 6.0 · as of 15 Sep 2026

Short-sale volume share21.8%5-day average of daily volume

Short-sale volume as % of daily volume

Large-order net flow, last 20 sessions

Net of large-order buying minus selling, in USD. Over this window: −$41.2K (8 inflow days, 12 outflow days).

Net flow by order size, last 20 sessions

Super/Big orders approximate institutional-size trades; Mid/Small approximate retail-size trades. Net buy minus sell value in each bucket, summed over the window.

The five largest holders on file together own 38.9% of shares outstanding.

Largest holders

BlackRock16.71%
Janus Henderson Group plc6.60%
Millennium Management LLC5.59%
Fuller & Thaler Asset Management, Inc.5.02%
Principal Global Investors, LLC5.01%
Vanguard Capital Management, LLC4.95%
State Street Global Advisors4.70%
MFS Investment Management4.32%

By investor type

Mutual Fund98.14%
Hedge Fund20.73%
Public Company4.77%
Government Pension Fund1.23%
Individual/Insider1.12%
Private Company0.75%
Family Office/Trust0.38%
Insurance Company0.36%

Reported short interest has risen from 16.85% to 18.31% of float over the last 6 biweekly reports (30 Jun 2026 to 15 Sep 2026).

Recent institutional activity

Holder	Type	Period	Share change	New stake
Nuveen Asset Management LLC	Insurance Company	2026/Q3	+102,970	0.3%
Simplify Asset Management Inc.	Mutual Fund	2026/Q3	+79,719	0.2%
Millennium Management LLC	Hedge Fund	2026/Q3	+300,830	5.6%
GoldenTree Asset Management LP	Hedge Fund	2026/Q3	+744,889	2.3%
Principal Global Investors, LLC	Mutual Fund	2026/Q3	+337,332	5.0%
Janus Henderson Group plc	Mutual Fund	2026/Q3	+321,421	6.6%
BlackRock	Mutual Fund	2026/Q3	+307,175	16.7%
Invesco Ltd.	Mutual Fund	2026/Q3	+179,340	3.2%
First Trust Advisors L.P.	Mutual Fund	2026/Q3	+156,987	0.5%
UBS Asset Management	Mutual Fund	2026/Q3	+154,552	0.8%
Victory Capital Management Inc.	Mutual Fund	2026/Q3	+134,948	2.3%
Fuller & Thaler Asset Management, Inc.	Mutual Fund	2026/Q3	+133,197	5.0%
Point72 Asset Management, L.P.	Hedge Fund	2026/Q3	+114,006	0.4%
Invesco Capital Management LLC	Mutual Fund	2026/Q3	+111,250	2.6%
State Street Global Advisors	Mutual Fund	2026/Q3	+104,337	4.7%

Institutional buy/sell activity by reporting period, largest moves first.

Insider transactions

Date	Insider	Title	Transaction	Shares	Price	Held after
29 Sep 2026	Scott Dreyer	Executive Vice President	Intent to Sell (Form 144)	-27,419	$22.00	–
16 Jul 2026	John Fallon	Independent Director	Intent to Sell (Form 144)	-13,920	$35.73	–
14 Jul 2026	John Fallon	Independent Director	Intent to Sell (Form 144)	-8,095	$36.32	–
7 Jun 2026	Gino Santini	Lead Independent Director	Derivative Exercise and Retained	+8,700	$16.49	43,736
17 May 2026	John Freund	Independent Director	Open Market Disposition	-20	$34.05	42,406
14 May 2026	John Freund	Independent Director	Derivative Exercise and Sale	-4,127	$34.54	42,426
14 May 2026	John Freund	Independent Director	Derivative Exercise and Retained	+4,573	$16.49	42,426
13 May 2026	John Freund	Independent Director	Other Acquisition	+8,741	–	64,675
13 May 2026	Nancy Lurker	Director	Other Acquisition	+8,741	–	18,532
13 May 2026	Garen Bohlin	Independent Director	Other Acquisition	+8,741	–	68,747
13 May 2026	Gino Santini	Lead Independent Director	Other Acquisition	+8,741	–	68,747
13 May 2026	Carlos Paya	Independent Director	Other Acquisition	+8,741	–	28,323
13 May 2026	Rita Balice-Gordon	Independent Director	Other Acquisition	+8,741	–	41,044
13 May 2026	Michael Donovan	Independent Director	Other Acquisition	+17,482	–	17,482
12 May 2026	Nancy Lurker	Director	Open Market Disposition	-4,500	$35.97	8,226
10 May 2026	Garen Bohlin	Independent Director	Derivative Exercise and Sale	-8,700	$37.18	2,253
17 Mar 2026	David Dieter	Executive Vice President	Automatic Disposition	-13,976	$34.92	77,071
16 Mar 2026	David Dieter	Executive Vice President	Sale to Issuer	-8,840	$35.72	68,231
8 Mar 2026	David Dieter	Executive Vice President	Automatic Disposition	-6,224	$36.65	91,047
2 Mar 2026	Scott Dreyer	Executive Vice President	Automatic Disposition	-49,976	$40.99	382

From Form 4/Form 144 filings. Negative share counts are disposals (sales, gifts, or shares withheld for taxes); positive are acquisitions.

Short interest, by report

Report date	Shares short	% of float	Days to cover
15 Sep 2026	5,675,115	18.3%	6.0
31 Aug 2026	6,063,781	19.6%	8.1
14 Aug 2026	6,523,302	21.0%	6.7
31 Jul 2026	5,080,634	15.7%	17.4
15 Jul 2026	5,233,514	16.1%	11.2
30 Jun 2026	5,466,533	16.9%	10.8

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