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 | |
|---|---|---|---|---|---|---|
|
TPCO
2451
CALL
DELISTED
Tribune Publishing Company Common Stock
TPCO
| $393K | ﹤0.01% |
347
-10
| -3% | -$145 |
|
2452
PUT
Chemours
CC
$2.59B
| $392K | ﹤0.01% |
139
-452
| -76% | -$14.3K |
|
2453
CALL
Extreme Networks
EXTR
$3.86B
| $392K | ﹤0.01% |
643
+612
| +1,974% | +$3.55K |
|
2454
PUT
Stratasys
SSYS
$697M
| $392K | ﹤0.01% |
218
+171
| +364% | +$3.57K |
|
|
VTLE
2455
PUT
DELISTED
Vital Energy
VTLE
| $392K | ﹤0.01% |
54
+51
| +1,700% | +$5.35K |
|
2456
PUT
Tucows
TCX
$97.1M
| $390K | ﹤0.01% |
65
-88
| -58% | -$4.92K |
|
2457
PUT
Invesco DB Base Metals Fund
DBB
$306M
| $389K | ﹤0.01% |
283
+141
| +99% | +$2.29K |
|
2458
Lexicon Pharmaceuticals
LXRX
$1.02B
| $389K | ﹤0.01% |
58,586
+45,657
| +353% | +$370K |
|
2459
CALL
Nice
NICE
$5.29B
| $389K | ﹤0.01% |
36
-3
| -8% | -$328 |
|
|
ELLI
2460
CALL
DELISTED
Ellie Mae Inc
ELLI
| $389K | ﹤0.01% |
62
+29
| +88% | +$2.06K |
|
2461
Bloomin' Brands
BLMN
$680M
| $388K | ﹤0.01% |
+21,710
| New | +$428K |
|
2462
PUT
HF Sinclair
DINO
$15.9B
| $388K | ﹤0.01% |
76
-597
| -89% | -$36.6K |
|
2463
Immersion
IMMR
$216M
| $388K | ﹤0.01% |
43,407
+27,584
| +174% | +$258K |
|
|
NEWR
2464
CALL
DELISTED
New Relic, Inc.
NEWR
| $388K | ﹤0.01% |
48
-55
| -53% | -$4.63K |
|
|
CCXI
2465
PUT
DELISTED
ChemoCentryx, Inc.
CCXI
| $388K | ﹤0.01% |
356
-19
| -5% | -$200 |
|
|
BLD
2466
PUT
DELISTED
TopBuild
BLD
| $387K | ﹤0.01% |
86
+38
| +79% | +$1.85K |
|
|
AD
2467
Array Digital Infrastructure
AD
$3.02B
| $387K | ﹤0.01% |
7,449
+1,705
| +30% | +$87.4K |
|
|
CBPO
2468
PUT
DELISTED
China Biologic Products Holdings, Inc.
CBPO
| $387K | ﹤0.01% |
51
-95
| -65% | -$6.99K |
|
2469
Henry Schein
HSIC
$9.74B
| $386K | ﹤0.01% |
6,273
+5,198
| +484% | +$342K |
|
2470
PUT
Canadian National Railway
CNI
$78.3B
| $385K | ﹤0.01% |
52
+34
| +189% | +$2.82K |
|
2471
Pinduoduo
PDD
$118B
| $385K | ﹤0.01% |
17,201
-31,728
| -65% | -$669K |
|
|
USCR
2472
PUT
DELISTED
U S Concrete, Inc.
USCR
| $384K | ﹤0.01% |
109
-32
| -23% | -$1.16K |
|
2473
CALL
Integra LifeSciences
IART
$1.54B
| $383K | ﹤0.01% |
85
-74
| -47% | -$4.06K |
|
|
PE
2474
PUT
DELISTED
PARSLEY ENERGY INC
PE
| $383K | ﹤0.01% |
240
+45
| +23% | +$1.02K |
|
2475
BBVA Argentina
BBAR
$3.85B
| $382K | ﹤0.01% |
33,767
-3,901
| -10% | -$44.1K |
|
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.