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
|
+$58.5M |
| 2 |
Alphabet (Google) Class C
GOOG
|
+$56.5M |
| 3 |
State Street SPDR S&P 500 ETF Trust
SPY
|
+$44.1M |
| 4 |
Apple
AAPL
|
+$20.3M |
| 5 |
State Street SPDR S&P Oil & Gas Exploration & Production ETF
XOP
|
+$12.7M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
Amazon
AMZN
|
+$109M |
| 2 |
Meta Platforms (Facebook)
META
|
+$62.3M |
| 3 |
Invesco QQQ Trust
QQQ
|
+$36.2M |
| 4 |
Goldman Sachs
GS
|
+$27.1M |
| 5 |
Boeing
BA
|
+$24.7M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Communication Services | 0.49% |
| 2 | Consumer Discretionary | 0.48% |
| 3 | Technology | 0.4% |
| 4 | Financials | 0.25% |
| 5 | Industrials | 0.22% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
|
HBI
2676
CALL
DELISTED
Hanesbrands
HBI
| $315K | ﹤0.01% |
252
-31
| -11% | -$482 |
|
2677
CALL
Vishay Intertechnology
VSH
$5.86B
| $315K | ﹤0.01% |
175
+85
| +94% | +$1.6K |
|
|
LLL
2678
DELISTED
L3 Technologies, Inc.
LLL
| $315K | ﹤0.01% |
1,815
+967
| +114% | +$186K |
|
2679
American Superconductor
AMSC
$1.48B
| $314K | ﹤0.01% |
28,193
+17,031
| +153% | +$146K |
|
2680
CALL
Loews
L
$24.3B
| $314K | ﹤0.01% |
69
+48
| +229% | +$2.26K |
|
2681
PUT
SiriusXM
SIRI
$10B
| $314K | ﹤0.01% |
55
-93
| -63% | -$5.65K |
|
2682
PUT
Nice
NICE
$5.29B
| $313K | ﹤0.01% |
29
-85
| -75% | -$9.3K |
|
2683
PUT
Sea Limited
SE
$61.2B
| $313K | ﹤0.01% |
277
+272
| +5,440% | +$3.4K |
|
|
SP
2684
CALL
DELISTED
SP Plus Corporation
SP
| $313K | ﹤0.01% |
106
+104
| +5,200% | +$3.22K |
|
|
LCI
2685
CALL
DELISTED
Lannett Company, Inc.
LCI
| $313K | ﹤0.01% |
158
-59
| -27% | -$1.12K |
|
|
NPTN
2686
DELISTED
NEOPHOTONICS CORP
NPTN
| $313K | ﹤0.01% |
48,375
+45,642
| +1,670% | +$349K |
|
|
KL
2687
PUT
DELISTED
Kirkland Lake Gold Ltd Ordinary
KL
| $313K | ﹤0.01% |
120
+32
| +36% | +$679 |
|
2688
CALL
Appian
APPN
$1.74B
| $312K | ﹤0.01% |
117
-103
| -47% | -$2.75K |
|
2689
Crown Castle
CCI
$32.7B
| $312K | ﹤0.01% |
+2,876
| New | +$316K |
|
2690
CALL
Fortive
FTV
$19B
| $311K | ﹤0.01% |
73
-68
| -48% | -$3.19K |
|
|
ARNA
2691
CALL
DELISTED
Arena Pharmaceuticals Inc
ARNA
| $311K | ﹤0.01% |
80
-17
| -18% | -$667 |
|
|
2692
Appian
APPN
$1.74B
| $310K | ﹤0.01% |
11,618
+6,487
| +126% | +$173K |
|
|
SA
2693
PUT
Seabridge Gold
SA
$2.8B
| $309K | ﹤0.01% |
234
+124
| +113% | +$1.57K |
|
|
EB
2694
CALL
DELISTED
Eventbrite
EB
| $308K | ﹤0.01% |
+111
| New | +$3.29K |
|
2695
CALL
Methanex
MEOH
$4.32B
| $308K | ﹤0.01% |
64
+47
| +276% | +$2.93K |
|
2696
PUT
Opko Health
OPK
$921M
| $308K | ﹤0.01% |
1,025
+202
| +25% | +$685 |
|
2697
CALL
Packaging Corp of America
PKG
$22.7B
| $308K | ﹤0.01% |
37
+21
| +131% | +$1.95K |
|
2698
PUT
Urban Outfitters
URBN
$5.99B
| $308K | ﹤0.01% |
93
-70
| -43% | -$2.62K |
|
|
PS
2699
PUT
DELISTED
Pluralsight, Inc. Class A Common Stock
PS
| $308K | ﹤0.01% |
131
+19
| +17% | +$438 |
|
2700
PUT
Axos Financial
AX
$5.45B
| $307K | ﹤0.01% |
122
-96
| -44% | -$2.9K |
|
Similar funds
Simplex Trading's Q4 2018 Portfolio in Review
As of Q4 2018, Simplex Trading held 8,576 positions worth $34.1B, up 9.5% from $31.1B the previous quarter. Its ten largest holdings account for 43% of the portfolio.
Simplex Trading's Q4 2018 filing shows 1,199 new, 2,701 increased, 2,877 reduced and 1,573 closed positions. Its largest new stake was State Street SPDR S&P 500 ETF Trust: 163,699 shares worth $40.9M. The largest sale was Amazon, an estimated $109M.
By sector, the portfolio is most concentrated in Communication Services at 0.49% of assets, down from 0.89% a quarter earlier, followed by Consumer Discretionary and Technology.
- Simplex Trading's largest Q4 2018 buy was State Street SPDR S&P 500 ETF Trust: 163,699 shares worth $40.9M.
- Simplex Trading added most to iShares Russell 2000 ETF in Q4 2018, an estimated $58.5M increase.
- Simplex Trading's biggest Q4 2018 reduction was Amazon, cutting an estimated $109M.
- Simplex Trading fully exited Meta Platforms (Facebook) in Q4 2018, selling an estimated $62.3M.
- Simplex Trading's ten largest holdings make up 43% of its $34.1B portfolio in Q4 2018.
- Simplex Trading opened 1,199 new positions and closed 1,573 in Q4 2018.
- Simplex Trading's portfolio value rose 9.5% quarter-over-quarter to $34.1B.
Based on Simplex Trading's 13F filing for Q4 2018, filed 16 Jan 2019.