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 | |
|---|---|---|---|---|---|---|
|
SMAR
3376
DELISTED
Smartsheet Inc.
SMAR
| $161K | ﹤0.01% |
+6,491
| New | +$161K |
|
|
STOR
3377
PUT
DELISTED
STORE Capital Corporation
STOR
| $161K | ﹤0.01% |
57
-9
| -14% | -$262 |
|
|
BZUN
3378
CALL
Baozun
BZUN
$163M
| $160K | ﹤0.01% |
55
-165
| -75% | -$6.09K |
|
3379
Chegg
CHGG
$118M
| $160K | ﹤0.01% |
5,656
-25,062
| -82% | -$675K |
|
3380
CALL
EQT Corp
EQT
$32.4B
| $160K | ﹤0.01% |
547
-910
| -62% | -$18.5K |
|
3381
Middleby
MIDD
$6.17B
| $160K | ﹤0.01% |
1,562
+206
| +15% | +$23.5K |
|
3382
CALL
Madison Square Garden
MSGS
$9.65B
| $160K | ﹤0.01% |
8
-226
| -97% | -$44K |
|
3383
PUT
Sonic Automotive
SAH
$3.27B
| $160K | ﹤0.01% |
+117
| New | +$1.94K |
|
|
UCTT
3384
CALL
Ultra Clean Holdings
UCTT
$3.41B
| $160K | ﹤0.01% |
190
+8
| +4% | +$78 |
|
|
AMRS
3385
PUT
DELISTED
Amyris Inc.
AMRS
| $160K | ﹤0.01% |
480
-692
| -59% | -$3.98K |
|
3386
PUT
BJs Wholesale Club
BJ
$12.5B
| $159K | ﹤0.01% |
72
+35
| +95% | +$804 |
|
3387
CALL
Frontline
FRO
$8.62B
| $159K | ﹤0.01% |
288
+244
| +555% | +$1.59K |
|
3388
CALL
Graco
GGG
$13.4B
| $159K | ﹤0.01% |
38
-29
| -43% | -$1.21K |
|
3389
PUT
Pan American Silver
PAAS
$18.1B
| $159K | ﹤0.01% |
109
+16
| +17% | +$229 |
|
3390
Sinclair Inc
SBGI
$1.01B
| $159K | ﹤0.01% |
+6,067
| New | +$177K |
|
3391
CALL
Wendy's
WEN
$1.43B
| $159K | ﹤0.01% |
102
+41
| +67% | +$699 |
|
|
BMCH
3392
DELISTED
BMC Stock Holdings, Inc
BMCH
| $159K | ﹤0.01% |
+10,278
| New | +$171K |
|
|
WUBA
3393
DELISTED
58.com Inc
WUBA
| $159K | ﹤0.01% |
+2,940
| New | +$179K |
|
3394
Ashland
ASH
$3.13B
| $158K | ﹤0.01% |
+2,231
| New | +$172K |
|
3395
CALL
Axos Financial
AX
$5.58B
| $158K | ﹤0.01% |
63
-91
| -59% | -$2.75K |
|
3396
Acuity Brands
AYI
$10.2B
| $158K | ﹤0.01% |
+1,378
| New | +$170K |
|
3397
PUT
Group 1 Automotive
GPI
$4.09B
| $158K | ﹤0.01% |
30
-98
| -77% | -$5.45K |
|
3398
PUT
Methanex
MEOH
$4.17B
| $158K | ﹤0.01% |
33
-54
| -62% | -$3.37K |
|
3399
PUT
Mitek Systems
MITK
$743M
| $158K | ﹤0.01% |
147
+107
| +268% | +$967 |
|
3400
Mercury Systems
MRCY
$5.92B
| $158K | ﹤0.01% |
3,343
+2,713
| +431% | +$132K |
|
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.