Simplex Trading Portfolio holdings
Simplex Trading, founded in 2004 and headquartered in Chicago, Illinois, is a technology-driven proprietary trading firm specializing in market-making and liquidity provision, primarily in U.S. equity options and futures options. Leveraging advanced proprietary software and data-driven analysis, the firm optimizes trading strategies and develops innovative solutions to capitalize on financial market opportunities, maintaining a competitive edge through automation and a collaborative team of technologists and traders. With a workforce exceeding 300 and led by CEO Erik Swanson since 2014, Simplex operates with a low-ego, high-intelligence culture, focusing on minimal bureaucracy and rapid execution, while also making strategic venture capital investments in fintech startups. Recognized as a top workplace in Chicago by Built In’s 2025 awards, Simplex continues to evolve, blending cutting-edge technology with a commitment to market efficiency and growth.
Top Buys
| Rank | Stock | Value |
|---|---|---|
| 1 |
iShares Russell 2000 ETF
IWM
|
+$29.8M |
| 2 |
State Street SPDR Dow Jones Industrial Average ETF Trust
DIA
|
+$17.1M |
| 3 |
Walt Disney
DIS
|
+$14.8M |
| 4 |
Gilead Sciences
GILD
|
+$11.8M |
| 5 |
iShares MSCI Emerging Markets ETF
EEM
|
+$11.2M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
Alphabet (Google) Class C
GOOG
|
+$92.9M |
| 2 |
Apple
AAPL
|
+$22.5M |
| 3 |
Meta Platforms (Facebook)
META
|
+$20.5M |
| 4 |
IBM
IBM
|
+$12.7M |
| 5 |
Baidu
BIDU
|
+$10M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Healthcare | 6.46% |
| 2 | Communication Services | 4.66% |
| 3 | Consumer Discretionary | 4.6% |
| 4 | Technology | 4.57% |
| 5 | Financials | 4.49% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
|
GG.WS.A
976
PUT
DELISTED
GOLDCORP INC SERIES A WARRANTS EXP 5/30/2007
GG.WS.A
| $183K | 0.01% |
369
+236
| +177% | +$117K |
|
977
Affiliated Managers Group
AMG
$9.19B
| $182K | 0.01% |
1,065
-283
| -21% | -$55.6K |
|
|
WRK
978
DELISTED
WestRock Company
WRK
| $182K | 0.01% |
+3,935
| New | +$211K |
|
|
IMMU
979
PUT
DELISTED
Immunomedics Inc
IMMU
| $182K | 0.01% |
442
+46
| +12% | +$117 |
|
|
MWE
980
CALL
DELISTED
MARKWEST ENERGY PARTNERS, LP
MWE
| $182K | 0.01% |
371
+215
| +138% | +$12.3K |
|
981
PUT
Pacira BioSciences
PCRX
$1.02B
| $181K | 0.01% |
79
+17
| +27% | +$1.04K |
|
982
Vanguard FTSE Europe ETF
VGK
$29.8B
| $181K | 0.01% |
3,694
-7,084
| -66% | -$375K |
|
983
EOG Resources
EOG
$77.5B
| $180K | 0.01% |
+2,478
| New | +$193K |
|
|
984
Meta Platforms (Facebook)
META
$1.54T
| $179K | 0.01% |
2,000
-223,596
| -99% | -$20.5M |
|
985
PUT
Prothena Corp
PRTA
$447M
| $179K | 0.01% |
124
+103
| +490% | +$6K |
|
986
PUT
Alaunos Therapeutics
TCRT
$4.69M
| $179K | 0.01% |
4
+1
| +33% | +$1.65K |
|
|
BDBD
987
DELISTED
BOULDER BRANDS INC
BDBD
| $179K | 0.01% |
21,901
+13,456
| +159% | +$108K |
|
988
PUT
Helmerich & Payne
HP
$3.5B
| $178K | 0.01% |
87
-271
| -76% | -$15.3K |
|
989
PUT
Martin Marietta Materials
MLM
$32.8B
| $178K | 0.01% |
331
+294
| +795% | +$47.6K |
|
990
PUT
Monster Beverage
MNST
$91.5B
| $178K | 0.01% |
3,558
+1,770
| +99% | +$41.5K |
|
991
CALL
AT&T
T
$160B
| $178K | 0.01% |
1,566
-1,698
| -52% | -$43.3K |
|
|
OKS
992
DELISTED
Oneok Partners LP
OKS
| $178K | 0.01% |
6,103
+2,312
| +61% | +$74.8K |
|
993
Fluor
FLR
$7.44B
| $177K | 0.01% |
4,191
-6,928
| -62% | -$325K |
|
|
ABB
994
DELISTED
ABB Ltd
ABB
| $177K | 0.01% |
10,050
+8,941
| +806% | +$174K |
|
995
The Greenbrier Companies
GBX
$1.59B
| $176K | 0.01% |
+5,494
| New | +$230K |
|
|
PMCS
996
DELISTED
P M C SIERRA INC
PMCS
| $176K | 0.01% |
+26,017
| New | +$177K |
|
997
Allegion
ALLE
$13.3B
| $175K | 0.01% |
+3,050
| New | +$186K |
|
998
Antero Resources
AR
$10.9B
| $175K | 0.01% |
8,281
-1,139
| -12% | -$30.3K |
|
999
CALL
BioMarin Pharmaceuticals
BMRN
$11.4B
| $175K | 0.01% |
530
+200
| +61% | +$26.7K |
|
1000
Calumet Specialty Products
CLMT
$3.73B
| $175K | 0.01% |
7,229
+5,652
| +358% | +$147K |
|
Similar funds
Simplex Trading's Q3 2015 Portfolio in Review
As of Q3 2015, Simplex Trading held 7,014 positions worth $1.36B, up 14% from $1.19B the previous quarter. Its ten largest holdings account for 15% of the portfolio.
Simplex Trading's Q3 2015 filing shows 1,810 new, 2,203 increased, 1,391 reduced and 1,420 closed positions. Its largest new stake was iShares Russell 2000 ETF: 251,486 shares worth $27.5M. The largest sale was Alphabet (Google) Class C, an estimated $92.9M.
By sector, the portfolio is most concentrated in Healthcare at 6.5% of assets, down from 7.8% a quarter earlier, followed by Communication Services and Consumer Discretionary.
- Simplex Trading's largest Q3 2015 buy was iShares Russell 2000 ETF: 251,486 shares worth $27.5M.
- Simplex Trading added most to iShares MSCI Emerging Markets ETF in Q3 2015, an estimated $11.2M increase.
- Simplex Trading's biggest Q3 2015 reduction was Alphabet (Google) Class C, cutting an estimated $92.9M.
- Simplex Trading fully exited IBM in Q3 2015, selling an estimated $12.7M.
- Simplex Trading's ten largest holdings make up 15% of its $1.36B portfolio in Q3 2015.
- Simplex Trading opened 1,810 new positions and closed 1,420 in Q3 2015.
- Simplex Trading's portfolio value rose 14% quarter-over-quarter to $1.36B.
Based on Simplex Trading's 13F filing for Q3 2015, filed 8 Oct 2015.