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 | |
|---|---|---|---|---|---|---|
3051
Solid Biosciences
SLDB
$777M
| $336K | ﹤0.01% |
+2,171
| New | +$246K |
|
3052
PUT
Veracyte
VCYT
$4.44B
| $336K | ﹤0.01% |
140
-16
| -10% | -$426 |
|
|
PBCT
3053
CALL
DELISTED
People's United Financial Inc
PBCT
| $336K | ﹤0.01% |
215
-88
| -29% | -$1.38K |
|
|
UFS
3054
PUT
DELISTED
DOMTAR CORPORATION (New)
UFS
| $336K | ﹤0.01% |
94
+43
| +84% | +$1.6K |
|
3055
B&G Foods
BGS
$291M
| $335K | ﹤0.01% |
17,753
-39,532
| -69% | -$759K |
|
3056
PUT
G-III Apparel Group
GIII
$1.52B
| $335K | ﹤0.01% |
130
+96
| +282% | +$2.41K |
|
3057
LyondellBasell Industries
LYB
$18.9B
| $335K | ﹤0.01% |
3,755
-15,130
| -80% | -$1.23M |
|
3058
CALL
OptimizeRx
OPRX
$120M
| $335K | ﹤0.01% |
232
+47
| +25% | +$727 |
|
3059
CALL
Tucows
TCX
$95.5M
| $335K | ﹤0.01% |
62
+50
| +417% | +$2.61K |
|
3060
CALL
Antero Midstream
AM
$10.4B
| $334K | ﹤0.01% |
452
+373
| +472% | +$3.22K |
|
3061
Tradeweb Markets
TW
$21.7B
| $334K | ﹤0.01% |
9,055
+3,716
| +70% | +$164K |
|
|
LVGO
3062
CALL
DELISTED
Livongo Health, Inc. Common Stock
LVGO
| $334K | ﹤0.01% |
+192
| New | +$5.81K |
|
3063
Canadian Natural Resources
CNQ
$93.4B
| $333K | ﹤0.01% |
25,543
-12,236
| -32% | -$152K |
|
|
KW
3064
CALL
DELISTED
Kennedy-Wilson Holdings
KW
| $333K | ﹤0.01% |
+152
| New | +$3.24K |
|
|
REV
3065
CALL
DELISTED
Revlon, Inc.
REV
| $333K | ﹤0.01% |
142
+140
| +7,000% | +$2.64K |
|
3066
CALL
Shutterstock
SSTK
$216M
| $332K | ﹤0.01% |
92
-30
| -25% | -$1.1K |
|
|
TUP
3067
DELISTED
Tupperware Brands Corporation
TUP
| $331K | ﹤0.01% |
+20,868
| New | +$322K |
|
3068
PUT
Aurinia Pharmaceuticals
AUPH
$1.96B
| $330K | ﹤0.01% |
618
+399
| +182% | +$2.42K |
|
3069
PUT
Host Hotels & Resorts
HST
$17.1B
| $330K | ﹤0.01% |
191
+154
| +416% | +$2.63K |
|
3070
PUT
Mitek Systems
MITK
$768M
| $330K | ﹤0.01% |
342
-640
| -65% | -$6.37K |
|
3071
CALL
Zebra Technologies
ZBRA
$12.6B
| $330K | ﹤0.01% |
16
-102
| -86% | -$20.6K |
|
3072
Cohu
COHU
$2.26B
| $329K | ﹤0.01% |
24,408
+24,203
| +11,806% | +$336K |
|
3073
CALL
Deluxe
DLX
$1.22B
| $329K | ﹤0.01% |
67
+60
| +857% | +$2.67K |
|
3074
Ericsson
ERIC
$31.8B
| $329K | ﹤0.01% |
41,279
+5,467
| +15% | +$46.6K |
|
3075
CALL
Louisiana-Pacific
LPX
$5.19B
| $329K | ﹤0.01% |
134
-182
| -58% | -$4.48K |
|
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.