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 |
Alibaba
BABA
|
+$50.3M |
| 2 |
Boeing
BA
|
+$24.3M |
| 3 |
SPDR Gold Trust
GLD
|
+$18.3M |
| 4 |
Biogen
BIIB
|
+$15.9M |
| 5 |
FedEx
FDX
|
+$15.1M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
Alphabet (Google) Class C
GOOG
|
+$60.3M |
| 2 |
iShares Russell 2000 ETF
IWM
|
+$36.4M |
| 3 |
Netflix
NFLX
|
+$19M |
| 4 |
State Street Industrial Select Sector SPDR ETF
XLI
|
+$17.3M |
| 5 |
iShares 20+ Year Treasury Bond ETF
TLT
|
+$14.2M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Consumer Discretionary | 0.49% |
| 2 | Technology | 0.48% |
| 3 | Healthcare | 0.35% |
| 4 | Industrials | 0.35% |
| 5 | Communication Services | 0.21% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
2926
CALL
NeoGenomics
NEO
$1.71B
| $372K | ﹤0.01% |
195
-134
| -41% | -$3.14K |
|
2927
PUT
Red Robin
RRGB
$136M
| $372K | ﹤0.01% |
112
-20
| -15% | -$657 |
|
|
FLXN
2928
CALL
DELISTED
Flexion Therapeutics, Inc.
FLXN
| $372K | ﹤0.01% |
272
+217
| +395% | +$2.58K |
|
2929
CALL
Gartner
IT
$9.87B
| $371K | ﹤0.01% |
26
+16
| +160% | +$2.33K |
|
|
MASI
2930
PUT
DELISTED
Masimo
MASI
| $371K | ﹤0.01% |
25
-166
| -87% | -$25.2K |
|
2931
Mitek Systems
MITK
$768M
| $371K | ﹤0.01% |
38,548
-24,132
| -39% | -$240K |
|
2932
Steel Dynamics
STLD
$36.1B
| $371K | ﹤0.01% |
+12,456
| New | +$368K |
|
2933
PUT
First Majestic Silver
AG
$8.01B
| $370K | ﹤0.01% |
408
-95
| -19% | -$928 |
|
2934
CALL
Suburban Propane Partners
SPH
$1.21B
| $370K | ﹤0.01% |
157
+106
| +208% | +$2.5K |
|
|
CRCM
2935
CALL
DELISTED
CARE.COM, INC.
CRCM
| $370K | ﹤0.01% |
355
+258
| +266% | +$2.65K |
|
|
PVTL
2936
DELISTED
Pivotal Software, Inc.
PVTL
| $370K | ﹤0.01% |
24,812
+17,894
| +259% | +$219K |
|
2937
CALL
Banco Bilbao Vizcaya Argentaria
BBVA
$147B
| $369K | ﹤0.01% |
710
+164
| +30% | +$841 |
|
2938
CALL
CVR Energy
CVI
$3.43B
| $369K | ﹤0.01% |
84
+26
| +45% | +$1.21K |
|
2939
CALL
FMC
FMC
$1.39B
| $369K | ﹤0.01% |
77
+12
| +18% | +$1.03K |
|
2940
CALL
Inseego
INSG
$114M
| $369K | ﹤0.01% |
77
-20
| -21% | -$930 |
|
|
AZPN
2941
CALL
DELISTED
ASPEN TECHNOLOGY INC
AZPN
| $369K | ﹤0.01% |
30
-122
| -80% | -$1.5M |
|
2942
PUT
SouthState Bank Corp
SSB
$10.2B
| $368K | ﹤0.01% |
49
+11
| +29% | +$829 |
|
2943
Devon Energy
DVN
$49.8B
| $367K | ﹤0.01% |
+15,277
| New | +$382K |
|
2944
Direxion Daily S&P Biotech Bull 3X ETF
LABU
$548M
| $367K | ﹤0.01% |
+595
| New | +$494K |
|
2945
CALL
Novanta
NOVT
$5.01B
| $367K | ﹤0.01% |
45
+40
| +800% | +$3.25K |
|
2946
PUT
Natera
NTRA
$37B
| $367K | ﹤0.01% |
112
+86
| +331% | +$2.54K |
|
|
CNH
2947
PUT
CNH Industrial
CNH
$13.7B
| $367K | ﹤0.01% |
+416
| New | +$3.66K |
|
2948
Cal-Maine
CALM
$4.2B
| $366K | ﹤0.01% |
9,176
-10,795
| -54% | -$448K |
|
2949
PUT
Editas Medicine
EDIT
$411M
| $366K | ﹤0.01% |
161
+56
| +53% | +$1.39K |
|
2950
Toyota
TM
$216B
| $366K | ﹤0.01% |
2,728
-4,692
| -63% | -$615K |
|
Similar funds
Simplex Trading's Q3 2019 Portfolio in Review
As of Q3 2019, Simplex Trading held 8,410 positions worth $35.2B, down 4.1% from $36.6B the previous quarter. Its ten largest holdings account for 33% of the portfolio.
Simplex Trading's Q3 2019 filing shows 1,312 new, 3,129 increased, 2,596 reduced and 1,163 closed positions. Its largest new stake was SPDR Gold Trust: 131,281 shares worth $18.2M. The largest sale was Alphabet (Google) Class C, an estimated $60.3M.
By sector, the portfolio is most concentrated in Consumer Discretionary at 0.49% of assets, up from 0.26% a quarter earlier, followed by Technology and Healthcare.
- Simplex Trading's largest Q3 2019 buy was SPDR Gold Trust: 131,281 shares worth $18.2M.
- Simplex Trading added most to Alibaba in Q3 2019, an estimated $50.3M increase.
- Simplex Trading's biggest Q3 2019 reduction was Alphabet (Google) Class C, cutting an estimated $60.3M.
- Simplex Trading fully exited iShares Russell 2000 ETF in Q3 2019, selling an estimated $36.4M.
- Simplex Trading's ten largest holdings make up 33% of its $35.2B portfolio in Q3 2019.
- Simplex Trading opened 1,312 new positions and closed 1,163 in Q3 2019.
- Simplex Trading's portfolio value fell 4.1% quarter-over-quarter to $35.2B.
Based on Simplex Trading's 13F filing for Q3 2019, filed 15 Oct 2019.