This story has been updated to reflect Feb. 4, 2015 closing prices.

NEW YORK (TheStreet) -- Getting in at the offering price on a hot IPO may prove difficult -- if not impossible -- for the majority of retail investors. That doesn't mean there aren't gains to be made once the stock is publicly traded -- if you buy at the right time.

Last year was a record-breaking year for initial public offerings in terms of deal size and number of deals, with Lending Club (LC and Alibaba (BABA , as the top two IPOs in 2014.

TheStreet analyzed how much retail investors would have gained if they had invested in some of the best performing IPOs of the year. With the help of data provided by Dealogic, we took the top 20 best-performing IPOs (as per their offer price compared to recent trading) and calculated the stocks' performances based on first-day trading low to current price.

Not surprisingly, biopharmaceutical and biotech companies dominate the list, but there are other companies, such as those taking advantage of the digital boom to develop new and interesting technologies for personal and commercial use.

Here's the top 14 on the list.

GPRO Chart
GPRO
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14. GoPro (GPRO - Get Report)
IPO Date: June 25, 2014
Deal Value: $491.3 million
Offering Price: $24
Opening day low: $28.65
Price as of Feb. 4: $51.87

GoPro makes high-definition personal video cameras popular with action sports enthusiasts. The stock has risen 81% from its first-day trading low of $28.65.

IRMD Chart
IRMD
data by YCharts

13. iRadimed (IRMD - Get Report)
IPO Date: July 15, 2014
Deal Value: $14.5 million
Offering Price: $6.25
Opening day low: $7.94
Price as of Feb. 4: $14.39

iRadimed is a provider of non-magnetic IV infusion pump systems that can safely and predictably deliver anesthesia and other IV fluids during various MRI procedures safe for use during MRI procedures. iRadimed's stock has risen 81% since its first day trading low of $7.94.

Must Read: 5 Small-Cap Health Care Stocks You Never Heard of But Should Consider for 2015

TUBE Chart
TUBE
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12. TubeMogul (TUBE
IPO Date: July 17, 2014
Deal Value: $14.5 million
Offering Price: $6.25
Opening day low: $8.15
Price as of Feb. 4: $15.28

TubeMogul produces advertising technology software to play on the growing trend of digital advertising. Shares have risen 87% from its first-day trading low of $8.15.

ZFGN Chart
ZFGN
data by YCharts

11. Zafgen (ZFGN
IPO Date: June 18, 2014
Deal Value: $110 million
Offering Price: $16
Opening day low: $19.23
Price as of Feb. 4: $36.99

Zafgen is a biopharmaceutical company developing treatment for severe obesity as a result of rare diseases, specifically from Prader-Willi syndrome and obesity caused by hypothalamic injury. The stock is up 92% from its first-day trading low of $19.23.

CLDN Chart
CLDN
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10. Celladon (CLDN
IPO Date: Jan. 29, 2014
Deal Value: $51 million
Offering Price: $8
Opening day low: $8.13
Price as of Feb. 4: $15.70

Celladon is a clinical-stage biotechnology company developing gene therapy for cardiovascular disease. The stock is up 93% from its first-day trading low of $8.13.

NVRO Chart
NVRO
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9. Nevro (NVRO - Get Report)
IPO Date: Nov. 5, 2014
Deal Value: $145 million
Offering Price: $18
Opening day low: $23.13
Price as of Feb. 4: $45.83

Nevro is a medical device company that develops and distributes high-frequency stimulation technology in the treatment of spinal cord chronic pain. The stock is up 98% since its first-day trading low of $23.13.

 

TNET Chart
TNET
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8. TriNet Group (TNET - Get Report)
IPO Date: March 26, 2014
Deal Value: $276 million
Offering Price: $16
Opening day low: $17.28
Price as of Feb. 4: $34.70

TriNet provides small and mid-sized businesses cloud-based HR solutions including automated expense reporting, applicant tracking, online learning library, performance management, time tracking and travel services, among other things. The stock is up 101% from its first-day trading low of $17.28.

ZEN Chart ZEN data by YCharts

7. Zendesk (ZEN - Get Report)
IPO Date: May 14, 2014
Deal Value: $115 million
Offering Price: $9
Opening day low: $11.06
Price as of Feb. 4: $23.99

Zendesk develops customer service software used by more than 48,000 clients across more than 150 countries and territories. The stock is up 117% from its first-day trading low of $11.06.

VBLT Chart
VBLT
data by YCharts

6. Vascular Biogenics (VBLT
IPO Date: Sept. 30, 2014
Deal Value: $40 million
Offering Price: $6
Opening day low: $5.85
Price as of Feb. 4: $12.78

Vascular Biogenics, an Israeli biotechnology company producing treatments for cancer and immune-inflammatory diseases. The stock is up 118% since its first-day trading low of $5.85.

OCUL Chart
OCUL
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5. Ocular Therapeutix (OCUL - Get Report)

IPO Date: July 24, 2014
Deal Value: $75 million
Offering Price: $13
Opening day low: $12.61
Price as of Feb. 4: $30.07

Ocular Therapeutix is a biopharmaceutical company that develops and sells therapies for eye diseases and conditions such as cataracts, glaucoma and ocular hypertension. Shares are up 138% since its first-day trading low of $12.61.

KITE Chart
KITE
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4. Kite Pharma (KITE
IPO Date: June 19, 2014
Deal Value: $147 million
Offering Price: $17
Opening day low: $25.27
Price as of Feb. 4: $63.30

Kite Pharma is a clinical stage biopharmaceutical company developing and selling cancer immunotherapy products, specifically T cell therapy products designed to restore the immune system's ability to recognize and eradicate tumors. The stock is up 150% since its first-day trading low of $25.27. 

ALDR Chart
ALDR
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3. Alder Biopharmaceuticals (ALDR
IPO Date: May 7, 2014
Deal Value: $89 million
Offering Price: $10
Opening day low: $9.50
Price as of Feb. 4: $24.02

Alder Biopharmaceuticals is a clinical stage biopharma company developing treatments for migraine headaches, autoimmune and inflammatory diseases and other conditions. Shares have risen 153% since its first day trading low of $9.50.

ASPX Chart
ASPX
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2. Auspex Pharmaceuticals (ASPX
IPO Date: Feb. 4, 2014
Deal Value: $97 million
Offering Price: $12
Opening day low: $13.25
Price as of Feb. 4: $59.15

Auspex Pharmaceuticals is a biopharma company developing medicines for the treatment of movement disorders and other rare movement diseases, including so-called orphan diseases, which affect fewer than 200,00 people in the U.S. The stock is up 346% from its first-day trading low of $13.25.

RDUS Chart
RDUS
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1. Radius Health (RDUS - Get Report)
IPO Date: June 5, 2014
Deal Value: $56 million
Offering Price: $8
Opening day low: $8
Price as of Feb. 4: $46.28

Radius Health is a biopharma company focused on developing treatments for osteoporosis and other serious endocrine-mediated diseases. Shares are up 479% from its first-day trading low of $8.