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 | |
|---|---|---|---|---|---|---|
2526
PUT
ATI
ATI
$27B
| $361K | ﹤0.01% |
166
+18
| +12% | +$467 |
|
2527
CALL
Cimpress
CMPR
$2.37B
| $361K | ﹤0.01% |
35
-38
| -52% | -$4.41K |
|
|
LX
2528
LexinFintech Holdings
LX
$244M
| $361K | ﹤0.01% |
49,844
+20,703
| +71% | +$191K |
|
2529
Merck
MRK
$324B
| $361K | ﹤0.01% |
+4,964
| New | +$350K |
|
2530
PUT
WPP
WPP
$4.04B
| $361K | ﹤0.01% |
66
+48
| +267% | +$2.86K |
|
2531
CALL
Kodak
KODK
$806M
| $360K | ﹤0.01% |
1,412
+1,404
| +17,550% | +$4.28K |
|
2532
CALL
PetMed Express
PETS
$42.5M
| $360K | ﹤0.01% |
155
+69
| +80% | +$1.84K |
|
2533
PUT
United Natural Foods
UNFI
$3.01B
| $360K | ﹤0.01% |
340
-142
| -29% | -$2.99K |
|
|
S
2534
CALL
DELISTED
Sprint Corporation
S
| $360K | ﹤0.01% |
619
+249
| +67% | +$1.53K |
|
2535
CALL
Angi Inc
ANGI
$224M
| $359K | ﹤0.01% |
22
+2
| +10% | +$363 |
|
2536
PUT
Viper Energy
VNOM
$8.81B
| $359K | ﹤0.01% |
138
-149
| -52% | -$4.88K |
|
|
CSOD
2537
DELISTED
Cornerstone OnDemand, Inc.
CSOD
| $359K | ﹤0.01% |
+7,138
| New | +$362K |
|
|
PE
2538
CALL
DELISTED
PARSLEY ENERGY INC
PE
| $359K | ﹤0.01% |
225
-96
| -30% | -$2.19K |
|
|
SBNY
2539
CALL
DELISTED
Signature Bank
SBNY
| $359K | ﹤0.01% |
35
-7
| -17% | -$788 |
|
2540
PUT
Central Garden & Pet Co Class A
CENTA
$2.41B
| $358K | ﹤0.01% |
130
-45
| -26% | -$1.08K |
|
|
ACOR
2541
PUT
DELISTED
Acorda Therapeutics
ACOR
| $358K | ﹤0.01% |
+2
| New | +$4.35K |
|
|
UFS
2542
CALL
DELISTED
DOMTAR CORPORATION (New)
UFS
| $358K | ﹤0.01% |
102
+89
| +685% | +$3.9K |
|
|
VG
2543
PUT
DELISTED
Vonage Holdings Corporation
VG
| $358K | ﹤0.01% |
411
+392
| +2,063% | +$4.49K |
|
2544
AGCO
AGCO
$8.78B
| $357K | ﹤0.01% |
+6,414
| New | +$362K |
|
2545
ON Semiconductor
ON
$33.8B
| $357K | ﹤0.01% |
21,638
+5,575
| +35% | +$96.4K |
|
2546
CALL
SSR Mining
SSRM
$5.57B
| $357K | ﹤0.01% |
296
+91
| +44% | +$965 |
|
|
UXIN
2547
CALL
Uxin Ltd
UXIN
$330M
| $357K | ﹤0.01% |
+7
| New | +$4.05K |
|
|
ORBK
2548
CALL
DELISTED
Orbotech Ltd
ORBK
| $356K | ﹤0.01% |
63
+42
| +200% | +$2.35K |
|
2549
PUT
Baytex Energy
BTE
$3.08B
| $355K | ﹤0.01% |
2,022
-12
| -0.6% | -$25 |
|
|
BEL
2550
PUT
DELISTED
Belmond Ltd.
BEL
| $355K | ﹤0.01% |
142
-191
| -57% | -$3.67K |
|
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.