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 |
Goldman Sachs
GS
|
+$40.4M |
| 2 |
NVIDIA
NVDA
|
+$23.1M |
| 3 |
iShares 20+ Year Treasury Bond ETF
TLT
|
+$21.5M |
| 4 |
Wells Fargo
WFC
|
+$20.8M |
| 5 |
Micron Technology
MU
|
+$20M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
Citigroup
C
|
+$21.4M |
| 2 |
Apple
AAPL
|
+$15.7M |
| 3 |
Invesco QQQ Trust
QQQ
|
+$14.4M |
| 4 |
Eli Lilly
LLY
|
+$10.5M |
| 5 |
iShares Biotechnology ETF
IBB
|
+$8.06M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Technology | 9.73% |
| 2 | Communication Services | 9.25% |
| 3 | Consumer Discretionary | 8.76% |
| 4 | Healthcare | 8.53% |
| 5 | Financials | 7.38% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
3876
Extreme Networks
EXTR
$3.8B
| $11K | ﹤0.01% |
+1,568
| New | +$9.39K |
|
3877
CALL
FormFactor
FORM
$6.51B
| $11K | ﹤0.01% |
429
+37
| +9% | +$429 |
|
3878
PUT
G-III Apparel Group
GIII
$1.54B
| $11K | ﹤0.01% |
79
-36
| -31% | -$918 |
|
3879
CALL
HP
HPQ
$26B
| $11K | ﹤0.01% |
111
+75
| +208% | +$1.21K |
|
3880
PUT
Henry Schein
HSIC
$9.78B
| $11K | ﹤0.01% |
403
+66
| +20% | +$4.29K |
|
3881
CALL
Icahn Enterprises
IEP
$5.1B
| $11K | ﹤0.01% |
73
+57
| +356% | +$3.21K |
|
|
BRSL
3882
PUT
Brightstar Lottery PLC
BRSL
$1.9B
| $11K | ﹤0.01% |
117
+38
| +48% | +$990 |
|
3883
PUT
Innodata
INOD
$1.81B
| $11K | ﹤0.01% |
40
+12
| +43% | +$26 |
|
3884
CALL
Integer Holdings
ITGR
$3.39B
| $11K | ﹤0.01% |
+23
| New | +$804 |
|
3885
PUT
Jakks Pacific
JAKK
$303M
| $11K | ﹤0.01% |
+39
| New | +$2.08K |
|
3886
PUT
Lattice Semiconductor
LSCC
$16B
| $11K | ﹤0.01% |
126
-64
| -34% | -$452 |
|
3887
Mercury Insurance
MCY
$6B
| $11K | ﹤0.01% |
+181
| New | +$10.8K |
|
3888
CALL
MakeMyTrip
MMYT
$5.38B
| $11K | ﹤0.01% |
25
-15
| -38% | -$481 |
|
3889
CALL
Mercury Systems
MRCY
$5.41B
| $11K | ﹤0.01% |
+23
| New | +$818 |
|
3890
CALL
MGIC Investment
MTG
$6.47B
| $11K | ﹤0.01% |
469
-458
| -49% | -$4.82K |
|
3891
PUT
McEwen Inc
MUX
$1B
| $11K | ﹤0.01% |
5
| – | – |
|
3892
Nektar Therapeutics
NKTR
$2.39B
| $11K | ﹤0.01% |
33
-1,521
| -98% | -$342K |
|
3893
Natera
NTRA
$36.4B
| $11K | ﹤0.01% |
+1,311
| New | +$12.5K |
|
3894
PUT
OSI Systems
OSIS
$3.53B
| $11K | ﹤0.01% |
114
+46
| +68% | +$3.42K |
|
3895
CALL
Outfront Media
OUT
$5.75B
| $11K | ﹤0.01% |
+65
| New | +$1.7K |
|
3896
CALL
Oxford Industries
OXM
$581M
| $11K | ﹤0.01% |
24
+1
| +4% | +$55 |
|
3897
CALL
Penske Automotive Group
PAG
$14.7B
| $11K | ﹤0.01% |
61
-6
| -9% | -$307 |
|
3898
CALL
Park Aerospace
PKE
$720M
| $11K | ﹤0.01% |
412
+301
| +271% | +$5.61K |
|
3899
CALL
PRA Group
PRAA
$672M
| $11K | ﹤0.01% |
95
+69
| +265% | +$2.59K |
|
3900
CALL
Shake Shack
SHAK
$2.54B
| $11K | ﹤0.01% |
415
+203
| +96% | +$7.02K |
|
Similar funds
Simplex Trading's Q1 2017 Portfolio in Review
As of Q1 2017, Simplex Trading held 7,485 positions worth $2.31B, up 38% from $1.67B the previous quarter. Its ten largest holdings account for 18% of the portfolio.
Simplex Trading deployed $551M of net new capital in Q1 2017, opening 1,662 new positions and adding to 2,374 existing holdings. Its largest new stake was iShares 20+ Year Treasury Bond ETF: 179,511 shares worth $21.7M.
By sector, the portfolio is most concentrated in Technology at 9.7% of assets, up from 7.2% a quarter earlier, followed by Communication Services and Consumer Discretionary.
On the sell side, the largest reduction was Citigroup, an estimated $21.4M trimmed.
- Simplex Trading's largest Q1 2017 buy was iShares 20+ Year Treasury Bond ETF: 179,511 shares worth $21.7M.
- Simplex Trading added most to Goldman Sachs in Q1 2017, an estimated $40.4M increase.
- Simplex Trading's biggest Q1 2017 reduction was Citigroup, cutting an estimated $21.4M.
- Simplex Trading fully exited Invesco QQQ Trust in Q1 2017, selling an estimated $14.4M.
- Simplex Trading's ten largest holdings make up 18% of its $2.31B portfolio in Q1 2017.
- Simplex Trading opened 1,662 new positions and closed 1,369 in Q1 2017.
- Simplex Trading's portfolio value rose 38% quarter-over-quarter to $2.31B.
Based on Simplex Trading's 13F filing for Q1 2017, filed 21 Apr 2017.