Portolan Capital Management 13F annual report

Portolan Capital Management is an investment fund managing more than $1.21 trillion ran by Betsy Flaherty. There are currently 117 companies in Mrs. Flaherty’s portfolio. The largest investments include Lantheus Inc and Celestica, together worth $93.9 billion.

Limited to 30 biggest holdings

$1.21 trillion Assets Under Management (AUM)

As of 7th August 2024, Portolan Capital Management’s top holding is 632,105 shares of Lantheus Inc currently worth over $50.8 billion and making up 4.2% of the portfolio value. Relative to the number of outstanding shares of Lantheus Inc, Portolan Capital Management owns more than approximately 0.1% of the company. In addition, the fund holds 753,116 shares of Celestica worth $43.2 billion, whose value grew 30.9% in the past six months. The third-largest holding is Super Micro Computer Inc worth $34.8 billion and the next is Zeta Global worth $33.9 billion, with 1,919,190 shares owned.

Currently, Portolan Capital Management's portfolio is worth at least $1.21 trillion. The total portfolio value may be much higher due to cash assets that are not publicly disclosed such as fixed income, real estate, or cash equivalents.

Careers at Portolan Capital Management

The Portolan Capital Management office and employees reside in Boston, Massachusetts. According to the last 13-F report filed with the SEC, Betsy Flaherty serves as the Chief Compliance Officer at Portolan Capital Management.

Recent trades

In the most recent 13F filing, Portolan Capital Management revealed that it had opened a new position in Celestica and bought 753,116 shares worth $43.2 billion. This means they effectively own approximately 0.1% of the company. Celestica makes up 12.1% of the fund's Technology sector allocation and has grown its share price by 139.3% in the past year.

The investment fund also strengthened its position in Lantheus Inc by buying 106,363 additional shares. This makes their stake in Lantheus Inc total 632,105 shares worth $50.8 billion. Lantheus Inc soared 41.2% in the past year.

On the other hand, there are companies that Portolan Capital Management is getting rid of from its portfolio. Portolan Capital Management closed its position in Celestica on 14th August 2024. It sold the previously owned 1,000,489 shares for $45 billion. Betsy Flaherty also disclosed a decreased stake in Super Micro Computer Inc by approximately 0.1%. This leaves the value of the investment at $34.8 billion and 42,439 shares.

One of the largest hedge funds

The two most similar investment funds to Portolan Capital Management are Baystate Wealth Management and Advocacy Wealth Management Services. They manage $1.21 trillion and $1.21 trillion respectively.


Betsy Flaherty investment strategy

Portolan Capital Management’s portfolio is diversified across 10 sectors. Currently, their heaviest sector is Technology — making up 29.4% of the total portfolio value. The fund focuses on investments in the United States as 53.8% of the portfolio companies are based in the United States.

The majority of the companies in the fund’s portfolio are large-cap stocks. Stocks with a size of more than $10 billion in market cap make up 12% of the total holdings value. On the other hand, small-cap stocks make up only 3.4% of the portfolio. The average market cap of the portfolio companies is close to $52.7 billion.

The complete list of Portolan Capital Management trades based on 13F SEC filings

These positions were updated on August 14th based on the fund’s latest 13F filing. Quickly find out what the most recently closed or increased positions are.

Security Shares Owned Value Allocation
Lantheus Holdings Inc
20.23%
632,105
$50,751,710,000 4.18%
Celestica, Inc.
Closed
1,000,489
$44,961,976,000
Celestica, Inc.
Opened
753,116
$43,176,140,000 3.56%
Super Micro Computer Inc
5.86%
42,439
$34,772,395,000 2.86%
Zeta Global Holdings Corp.
18.31%
1,919,190
$33,873,704,000 2.79%
Kratos Defense & Sec Solutions
2.89%
1,630,421
$32,624,724,000 2.69%
e.l.f. Beauty Inc
16.23%
139,649
$29,426,837,000 2.42%
Modine Mfg Co
3.69%
278,825
$27,935,477,000 2.30%
Western Digital Corp.
5.10%
355,997
$26,973,893,000 2.22%
nVent Electric plc
22.22%
348,556
$26,702,875,000 2.20%
Castle Biosciences, Inc.
16.06%
1,210,952
$26,362,425,000 2.17%
Quanterix Corp
64.95%
1,918,030
$25,337,176,000 2.09%
Honest Co Inc
8.23%
8,105,357
$23,667,642,000 1.95%
TTM Technologies Inc
130.27%
1,192,680
$23,173,772,000 1.91%
Biolife Solutions Inc
15.22%
1,004,228
$21,520,606,000 1.77%
Acm Resh Inc
58.95%
855,835
$19,735,555,000 1.63%
Natera Inc
17.22%
166,577
$18,038,623,000 1.49%
United Therapeutics Corp
50.56%
54,845
$17,470,875,000 1.44%
Kemper Corp
95.88%
286,316
$16,987,128,000 1.40%
Micron Technology Inc.
24.19%
121,103
$15,928,678,000 1.31%
Genius Sports Limited
31.50%
2,898,346
$15,795,986,000 1.30%
Tecnoglass Inc
19.83%
293,587
$14,732,196,000 1.21%
American Intl Group Inc
53.46%
195,168
$14,489,272,000 1.19%
R1 RCM Inc.
Closed
1,097,612
$14,137,243,000
i3 Verticals Inc
32.00%
629,151
$13,891,654,000 1.14%
Silicon Motion Technology Corp
6.43%
170,246
$13,788,224,000 1.14%
Shift4 Pmts Inc
21.65%
187,500
$13,753,125,000 1.13%
Maravai Lifesciences Holdings, Inc.
171.31%
1,846,140
$13,218,362,000 1.09%
Avid Bioservices Inc
110.04%
1,820,779
$13,000,362,000 1.07%
Skechers U S A, Inc.
14.43%
183,190
$12,662,093,000 1.04%
Sweetgreen, Inc.
57.91%
419,875
$12,655,033,000 1.04%
Indie Semiconductor Inc
10.68%
2,040,951
$12,592,668,000 1.04%
Dell Technologies Inc
51.07%
89,992
$12,410,797,000 1.02%
Cellebrite Di Ltd
10.73%
1,020,952
$12,200,376,000 1.00%
QuinStreet Inc
102.79%
731,285
$12,132,018,000 1.00%
Orion Group Holdings Inc
Opened
1,267,822
$12,056,987,000 0.99%
Meta Platforms Inc
6.94%
23,661
$11,930,349,000 0.98%
Reddit Inc
Opened
186,046
$11,886,479,000 0.98%
Kura Sushi USA, Inc.
26.27%
187,875
$11,853,034,000 0.98%
Arcturus Therapeutics Hldgs
98.20%
484,907
$11,807,485,000 0.97%
Phathom Pharmaceuticals Inc
Opened
1,130,089
$11,639,917,000 0.96%
Celsius Holdings Inc
97.95%
196,493
$11,217,785,000 0.92%
AeroVironment Inc.
32.47%
61,280
$11,162,765,000 0.92%
Gds Hldgs Ltd
Closed
1,663,662
$11,063,352,000
Agnico Eagle Mines Ltd
45.77%
169,030
$11,054,562,000 0.91%
Similarweb Ltd.
33.00%
1,367,259
$10,623,602,000 0.87%
Flex Ltd
17.05%
356,839
$10,523,182,000 0.87%
Oracle Corp.
37.84%
72,110
$10,181,932,000 0.84%
SMART Global Holdings Inc
36.25%
441,815
$10,104,309,000 0.83%
Northern Oil & Gas Inc
9.96%
267,170
$9,930,709,000 0.82%
IES Holdings Inc
Opened
69,455
$9,677,165,000 0.80%
Payoneer Global Inc
38.36%
1,677,402
$9,292,807,000 0.77%
Crocs Inc
52.42%
63,373
$9,248,656,000 0.76%
Couchbase Inc
16.68%
491,944
$8,982,897,000 0.74%
Vertiv Holdings Co
21.13%
102,466
$8,870,482,000 0.73%
Gates Indl Corp Plc
157.19%
558,192
$8,825,016,000 0.73%
Royalty Pharma plc
Closed
288,378
$8,758,040,000
AngloGold Ashanti Plc.
38.50%
331,286
$8,325,217,000 0.69%
Mitek Sys Inc
Opened
742,728
$8,303,699,000 0.68%
Teck Resources Ltd
Opened
158,961
$7,614,232,000 0.63%
Enova International Inc.
1.16%
122,081
$7,599,542,000 0.63%
Repay Hldgs Corp
12.31%
715,111
$7,551,572,000 0.62%
Baidu Inc
55.91%
84,847
$7,337,569,000 0.60%
AXT Inc
Closed
1,596,232
$7,326,705,000
Scorpio Tankers Inc
24.39%
90,006
$7,316,588,000 0.60%
MYT Netherlands Parent B.V.
94.22%
1,382,816
$7,052,362,000 0.58%
Eldorado Gold Corp.
17.95%
472,142
$6,982,980,000 0.57%
Applied Optoelectronics Inc
41.39%
841,059
$6,972,379,000 0.57%
Bio Rad Labs Inc
72.36%
25,150
$6,868,717,000 0.57%
SLM Corp.
688.48%
318,697
$6,625,711,000 0.55%
Maxcyte Inc
1.98%
1,687,650
$6,615,588,000 0.54%
Mdu Res Group Inc
Opened
262,014
$6,576,551,000 0.54%
Infinera Corp.
Opened
1,077,664
$6,562,974,000 0.54%
GFL Environmental Inc.
Closed
189,386
$6,533,817,000
BrightView Holdings Inc
32.65%
485,165
$6,452,695,000 0.53%
Take-Two Interactive Software, Inc.
40.12%
41,384
$6,434,798,000 0.53%
Sunopta, Inc.
47.78%
1,183,964
$6,393,406,000 0.53%
Crescent Pt Energy Corp
Closed
776,860
$6,362,483,000
Primoris Svcs Corp
Opened
126,542
$6,313,180,000 0.52%
Veren Inc.
Opened
791,988
$6,232,946,000 0.51%
Opera Ltd
Opened
435,464
$6,113,915,000 0.50%
Radnet Inc
7.84%
101,347
$5,971,365,000 0.49%
Potbelly Corp
35.27%
741,766
$5,956,381,000 0.49%
International Seaways Inc
9.35%
93,191
$5,510,384,000 0.45%
Techtarget Inc.
Closed
162,883
$5,388,170,000
Akamai Technologies Inc
Opened
59,716
$5,379,217,000 0.44%
Super Hi Intl Hldg Ltd
Opened
296,540
$5,337,720,000 0.44%
OrthoPediatrics corp
Opened
185,329
$5,330,062,000 0.44%
CryoPort Inc
Closed
295,652
$5,233,040,000
Custom Truck One Source Inc
4.65%
1,186,380
$5,160,753,000 0.42%
Navios Maritime Partners L.P.
2.21%
101,090
$5,158,623,000 0.42%
Alpha &omega Semiconductor
Opened
137,995
$5,156,873,000 0.42%
DigitalOcean Holdings, Inc.
Closed
132,137
$5,044,991,000
Navigator Hldgs Ltd
7.07%
287,156
$5,013,744,000 0.41%
Overseas Shipholding Group I
Closed
771,227
$4,935,853,000
Nuvei Corporation
Closed
154,989
$4,900,752,000
Warby Parker Inc.
69.65%
302,898
$4,864,542,000 0.40%
Extreme Networks Inc.
Opened
360,104
$4,843,399,000 0.40%
Ultra Clean Hldgs Inc
Closed
99,992
$4,593,632,000
Forrester Resh Inc
33.05%
264,877
$4,524,099,000 0.37%
Applied Digital Corp
37.28%
756,556
$4,501,508,000 0.37%
Telos Corp Md
50.56%
1,110,557
$4,464,439,000 0.37%
Walkme Ltd
86.19%
313,839
$4,384,331,000 0.36%
Identiv Inc
29.65%
1,014,886
$4,364,010,000 0.36%
Amphastar Pharmaceuticals In
19.62%
108,863
$4,354,520,000 0.36%
Altimmune Inc
27.84%
640,242
$4,257,609,000 0.35%
Viking Therapeutics Inc
18.61%
79,422
$4,210,160,000 0.35%
Oatly Group AB
Opened
4,384,079
$4,121,034,000 0.34%
Limbach Holdings Inc
Opened
72,352
$4,118,999,000 0.34%
AZZ Inc
Closed
51,323
$3,967,781,000
AMKOR Technology Inc.
Opened
98,394
$3,937,728,000 0.32%
Hudson Technologies, Inc.
35.40%
442,896
$3,893,056,000 0.32%
Pacira BioSciences Inc
Opened
131,901
$3,773,688,000 0.31%
Matrix Svc Co
47.59%
379,070
$3,764,165,000 0.31%
Alarm.com Holdings Inc
Closed
50,201
$3,638,066,000
Bel Fuse Inc.
49.64%
54,237
$3,538,422,000 0.29%
Douglas Elliman Inc.
Closed
2,215,469
$3,500,441,000
Gen Restaurent Group
0.12%
366,118
$3,317,029,000 0.27%
Skyline Champion Corp
44.91%
44,426
$3,009,862,000 0.25%
1stdibs Com Inc
0.96%
660,953
$2,967,679,000 0.24%
EverQuote Inc
61.81%
140,232
$2,925,240,000 0.24%
Porch Group Inc
Closed
631,459
$2,721,588,000
Microsoft Corporation
0.04%
5,300
$2,368,835,000 0.20%
Opko Health Inc
41.79%
1,886,749
$2,358,436,000 0.19%
Mamas Creations Inc
Opened
344,024
$2,318,722,000 0.19%
WEX Inc
Opened
12,863
$2,278,552,000 0.19%
Remitly Global Inc
2.31%
179,892
$2,180,291,000 0.18%
Lantronix Inc
Closed
578,180
$2,058,321,000
Semtech Corp.
61.32%
64,182
$1,917,758,000 0.16%
Casella Waste Sys Inc
0.06%
15,682
$1,555,968,000 0.13%
Pagaya Technologies Ltd
Closed
149,584
$1,510,798,000
Alphabet Inc
0.02%
6,171
$1,131,885,000 0.09%
Th International Limited
Closed
776,241
$892,677,000
Icad Inc
45.92%
653,372
$849,384,000 0.07%
Bluelinx Hldgs Inc
No change
4,229
$393,678,000 0.03%
PLBY Group, Inc.
Closed
289,354
$303,822,000
Richardson Electrs Ltd
Closed
11,950
$110,060,000
Nerdy Inc
98.90%
32,100
$53,607,000 0.00%
Harvard Bioscience Inc.
98.28%
12,000
$34,200,000 0.00%
No transactions found
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