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 | |
|---|---|---|---|---|---|---|
1476
Citizens Financial Group
CFG
$30.4B
| $1.22M | ﹤0.01% |
40,891
+25,506
| +166% | +$894K |
|
1477
Alaska Air
ALK
$5.15B
| $1.21M | ﹤0.01% |
19,836
+18,185
| +1,101% | +$1.18M |
|
1478
Canadian Solar
CSIQ
$906M
| $1.21M | ﹤0.01% |
84,213
+43,540
| +107% | +$656K |
|
|
EMBJ
1479
PUT
Embraer S.A. ADS
EMBJ
$11.6B
| $1.21M | ﹤0.01% |
545
-237
| -30% | -$5.04K |
|
1480
CALL
Dropbox
DBX
$6.81B
| $1.2M | ﹤0.01% |
589
-251
| -30% | -$5.78K |
|
1481
PUT
B&G Foods
BGS
$285M
| $1.2M | ﹤0.01% |
416
-15
| -3% | -$429 |
|
1482
PUT
Nucor
NUE
$56.4B
| $1.2M | ﹤0.01% |
232
-22
| -9% | -$1.3K |
|
|
WCN
1483
PUT
Waste Connections
WCN
$42.8B
| $1.2M | ﹤0.01% |
161
+143
| +794% | +$10.9K |
|
|
HTLF
1484
CALL
DELISTED
Heartland Financial USA, Inc.
HTLF
| $1.2M | ﹤0.01% |
+272
| New | +$14.3K |
|
|
LNW
1485
PUT
DELISTED
Light & Wonder
LNW
| $1.19M | ﹤0.01% |
668
+247
| +59% | +$4.99K |
|
1486
CALL
Ashland
ASH
$3.04B
| $1.19M | ﹤0.01% |
168
-135
| -45% | -$10.4K |
|
1487
DaVita
DVA
$15.1B
| $1.19M | ﹤0.01% |
+23,171
| New | +$1.48M |
|
1488
PUT
Editas Medicine
EDIT
$399M
| $1.19M | ﹤0.01% |
524
-59
| -10% | -$1.61K |
|
1489
CALL
Philips
PHG
$25.4B
| $1.19M | ﹤0.01% |
437
+129
| +42% | +$3.81K |
|
1490
CALL
Steel Dynamics
STLD
$35.6B
| $1.19M | ﹤0.01% |
396
+103
| +35% | +$3.89K |
|
|
JOYY
1491
JOYY Inc
JOYY
$3.73B
| $1.19M | ﹤0.01% |
19,878
-12,502
| -39% | -$814K |
|
|
RESI
1492
CALL
DELISTED
Front Yard Residential Corporation Common Stock
RESI
| $1.19M | ﹤0.01% |
1,362
+1,344
| +7,467% | +$12.6K |
|
1493
CALL
Texas Roadhouse
TXRH
$12.7B
| $1.19M | ﹤0.01% |
199
+177
| +805% | +$11.4K |
|
|
SGI
1494
PUT
Somnigroup International
SGI
$15.1B
| $1.19M | ﹤0.01% |
1,148
-496
| -30% | -$5.94K |
|
1495
PUT
DexCom
DXCM
$27.6B
| $1.19M | ﹤0.01% |
396
-1,204
| -75% | -$38.2K |
|
|
ABB
1496
DELISTED
ABB Ltd
ABB
| $1.19M | ﹤0.01% |
+62,415
| New | +$1.26M |
|
|
AXON
1497
CALL
Axon Enterprise
AXON
$40.5B
| $1.19M | ﹤0.01% |
271
-1
| -0.4% | -$52 |
|
1498
CALL
Perrigo
PRGO
$1.4B
| $1.19M | ﹤0.01% |
306
+131
| +75% | +$8.32K |
|
1499
STMicroelectronics
STM
$46B
| $1.18M | ﹤0.01% |
85,367
+57,438
| +206% | +$861K |
|
1500
CALL
Cracker Barrel
CBRL
$1.2B
| $1.18M | ﹤0.01% |
74
-95
| -56% | -$15.6K |
|
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.