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 |
LNKD
LinkedIn Corporation
LNKD
|
+$21.4M |
| 2 |
SPDR Gold Trust
GLD
|
+$17.3M |
| 3 |
QIHU
QIHOO 360 TECHNOLOGY CO LTD ADS RPSTG 3 CL A SHS
QIHU
|
+$15M |
| 4 |
Biogen
BIIB
|
+$14.9M |
| 5 |
Visa
V
|
+$14.1M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
Broadcom
AVGO
|
+$36.7M |
| 2 |
Alphabet (Google) Class C
GOOG
|
+$20.1M |
| 3 |
iShares MSCI Emerging Markets ETF
EEM
|
+$15.8M |
| 4 |
Citigroup
C
|
+$14.7M |
| 5 |
State Street SPDR S&P MIDCAP 400 ETF Trust
MDY
|
+$13.1M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Communication Services | 6.61% |
| 2 | Healthcare | 6.55% |
| 3 | Technology | 6.45% |
| 4 | Consumer Discretionary | 4.54% |
| 5 | Financials | 4.51% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
3676
CALL
DexCom
DXCM
$28.9B
| $9K | ﹤0.01% |
48
-48
| -50% | -$817 |
|
3677
CALL
Euronet Worldwide
EEFT
$3.15B
| $9K | ﹤0.01% |
128
+77
| +151% | +$5.86K |
|
3678
Enphase Energy
ENPH
$4.79B
| $9K | ﹤0.01% |
4,847
+3,392
| +233% | +$7.45K |
|
3679
Liberty Media Series A
FWONA
$23.3B
| $9K | ﹤0.01% |
522
-8,792
| -94% | -$171K |
|
3680
CALL
The GEO Group
GEO
$4.11B
| $9K | ﹤0.01% |
+150
| New | +$3.31K |
|
|
GTLS
3681
PUT
DELISTED
Chart Industries
GTLS
| $9K | ﹤0.01% |
23
-46
| -67% | -$1.14K |
|
|
HIMX
3682
CALL
Himax Technologies
HIMX
$2.09B
| $9K | ﹤0.01% |
189
-197
| -51% | -$1.94K |
|
3683
PUT
ImmunityBio
IBRX
$7.3B
| $9K | ﹤0.01% |
15
+5
| +50% | +$39 |
|
3684
PUT
IPG Photonics
IPGP
$3.57B
| $9K | ﹤0.01% |
44
-7
| -14% | -$616 |
|
3685
CALL
St. Joe Company
JOE
$3.57B
| $9K | ﹤0.01% |
180
+116
| +181% | +$1.98K |
|
3686
PUT
Main Street Capital
MAIN
$5.14B
| $9K | ﹤0.01% |
179
+78
| +77% | +$2.48K |
|
3687
PUT
MiMedx Group
MDXG
$649M
| $9K | ﹤0.01% |
74
+54
| +270% | +$420 |
|
3688
MidCap Financial Investment
MFIC
$811M
| $9K | ﹤0.01% |
+549
| New | +$9.2K |
|
3689
CALL
Norwegian Cruise Line
NCLH
$9.74B
| $9K | ﹤0.01% |
160
+72
| +82% | +$3.43K |
|
3690
CALL
National Fuel Gas
NFG
$7.73B
| $9K | ﹤0.01% |
25
+4
| +19% | +$216 |
|
3691
PUT
NRG Energy
NRG
$26.9B
| $9K | ﹤0.01% |
51
+26
| +104% | +$385 |
|
3692
PUT
News Corp Class B
NWS
$17.2B
| $9K | ﹤0.01% |
+96
| New | +$1.2K |
|
3693
ONE Gas
OGS
$5.06B
| $9K | ﹤0.01% |
+140
| New | +$8.44K |
|
3694
PUT
Omeros
OMER
$816M
| $9K | ﹤0.01% |
12
-31
| -72% | -$382 |
|
3695
PUT
Open Text
OTEX
$6.02B
| $9K | ﹤0.01% |
402
+48
| +14% | +$1.36K |
|
3696
PUT
Packaging Corp of America
PKG
$22.6B
| $9K | ﹤0.01% |
337
+82
| +32% | +$5.36K |
|
3697
Pluri
PLUR
$18.1M
| $9K | ﹤0.01% |
94
+84
| +840% | +$10.5K |
|
3698
CPI Card Group
PMTS
$243M
| $9K | ﹤0.01% |
383
-349
| -48% | -$10.7K |
|
3699
PPG Industries
PPG
$26.5B
| $9K | ﹤0.01% |
+95
| New | +$10.4K |
|
3700
CALL
Progress Software
PRGS
$1.66B
| $9K | ﹤0.01% |
86
+63
| +274% | +$1.62K |
|
Similar funds
Simplex Trading's Q2 2016 Portfolio in Review
As of Q2 2016, Simplex Trading held 7,153 positions worth $1.5B, up 19% from $1.25B the previous quarter. Its ten largest holdings account for 19% of the portfolio.
Simplex Trading deployed $178M of net new capital in Q2 2016, opening 1,586 new positions and adding to 2,321 existing holdings. Its largest new stake was Biogen: 56,467 shares worth $13.7M.
By sector, the portfolio is most concentrated in Communication Services at 6.6% of assets, down from 6.9% a quarter earlier, followed by Healthcare and Technology.
On the sell side, the largest reduction was Broadcom, an estimated $36.7M trimmed.
- Simplex Trading's largest Q2 2016 buy was Biogen: 56,467 shares worth $13.7M.
- Simplex Trading added most to LinkedIn Corporation in Q2 2016, an estimated $21.4M increase.
- Simplex Trading's biggest Q2 2016 reduction was Broadcom, cutting an estimated $36.7M.
- Simplex Trading fully exited Alphabet (Google) Class C in Q2 2016, selling an estimated $20.1M.
- Simplex Trading's ten largest holdings make up 19% of its $1.5B portfolio in Q2 2016.
- Simplex Trading opened 1,586 new positions and closed 1,363 in Q2 2016.
- Simplex Trading's portfolio value rose 19% quarter-over-quarter to $1.5B.
Based on Simplex Trading's 13F filing for Q2 2016, filed 18 Jul 2016.