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 |
GE Aerospace
GE
|
+$36M |
| 2 |
Advanced Micro Devices
AMD
|
+$19.4M |
| 3 |
iShares MSCI EAFE ETF
EFA
|
+$10.2M |
| 4 |
Micron Technology
MU
|
+$6.31M |
| 5 |
Alibaba
BABA
|
+$6.19M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
NVIDIA
NVDA
|
+$25.9M |
| 2 |
SPDR Gold Trust
GLD
|
+$15.3M |
| 3 |
Amazon
AMZN
|
+$9.53M |
| 4 |
State Street SPDR S&P 500 ETF Trust
SPY
|
+$9.03M |
| 5 |
State Street Technology Select Sector SPDR ETF
XLK
|
+$7.73M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Technology | 0.49% |
| 2 | Consumer Discretionary | 0.39% |
| 3 | Communication Services | 0.27% |
| 4 | Healthcare | 0.25% |
| 5 | Financials | 0.25% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
|
SKX
2626
CALL
DELISTED
Skechers
SKX
| $1.4M | ﹤0.01% |
27,500
+2,800
| +11% | +$139K |
|
|
PFPT
2627
DELISTED
Proofpoint, Inc.
PFPT
| $1.4M | ﹤0.01% |
8,047
| – | – |
|
2628
PUT
B&G Foods
BGS
$285M
| $1.4M | ﹤0.01% |
44,100
-600
| -1% | -$18K |
|
2629
PUT
DNOW Inc
DNOW
$2.63B
| $1.4M | ﹤0.01% |
143,600
-100
| -0.1% | -$817 |
|
2630
PUT
Ares Capital
ARCC
$13.5B
| $1.39M | ﹤0.01% |
70,900
+100
| +0.1% | +$2K |
|
|
GPMT
2631
CALL
Granite Point Mortgage Trust
GPMT
$63.7M
| $1.39M | ﹤0.01% |
93,100
| – | – |
|
2632
CALL
The RealReal
REAL
$1.34B
| $1.39M | ﹤0.01% |
68,300
-1,200
| -2% | -$17.8K |
|
|
COHR
2633
PUT
DELISTED
Coherent Inc
COHR
| $1.39M | ﹤0.01% |
5,300
+200
| +4% | +$50.2K |
|
|
XIFR
2634
PUT
XPLR Infrastructure LP
XIFR
$1.18B
| $1.39M | ﹤0.01% |
18,200
| – | – |
|
2635
PUT
Banco Macro
BMA
$5.7B
| $1.39M | ﹤0.01% |
93,900
| – | – |
|
2636
CALL
Haemonetics
HAE
$3.58B
| $1.39M | ﹤0.01% |
20,500
| – | – |
|
2637
Cardinal Health
CAH
$53.4B
| $1.39M | ﹤0.01% |
23,934
+1,511
| +7% | +$82K |
|
2638
Darling Ingredients
DAR
$9.93B
| $1.39M | ﹤0.01% |
20,590
-26
| -0.1% | -$1.86K |
|
2639
PUT
Yelp
YELP
$1.38B
| $1.39M | ﹤0.01% |
33,900
+1,600
| +5% | +$60.6K |
|
|
CTLT
2640
PUT
DELISTED
CATALENT, INC.
CTLT
| $1.39M | ﹤0.01% |
12,500
| – | – |
|
2641
Cadence Design Systems
CDNS
$90B
| $1.38M | ﹤0.01% |
10,107
-809
| -7% | -$123K |
|
2642
Howmet Aerospace
HWM
$116B
| $1.38M | ﹤0.01% |
39,941
+45
| +0.1% | +$1.45K |
|
2643
CALL
Kornit Digital
KRNT
$706M
| $1.38M | ﹤0.01% |
11,100
| – | – |
|
|
RAD
2644
CALL
DELISTED
Rite Aid Corporation
RAD
| $1.38M | ﹤0.01% |
85,200
+5,700
| +7% | +$89.7K |
|
|
UNVR
2645
DELISTED
Univar Solutions Inc.
UNVR
| $1.38M | ﹤0.01% |
56,149
| – | – |
|
2646
PUT
Lindblad Expeditions
LIND
$1.76B
| $1.38M | ﹤0.01% |
85,600
| – | – |
|
2647
PUT
Acadia Healthcare
ACHC
$3.17B
| $1.38M | ﹤0.01% |
21,700
| – | – |
|
|
IS
2648
DELISTED
ironSource Ltd.
IS
| $1.38M | ﹤0.01% |
128,091
+1,130
| +0.9% | +$11.2K |
|
|
TTM.RT
2649
CALL
DELISTED
TATA MOTORS LIMITED RT PUR ADR
TTM.RT
| $1.38M | ﹤0.01% |
60,000
-3,400
| -5% | -$78.1K |
|
2650
Viasat
VSAT
$9.79B
| $1.38M | ﹤0.01% |
27,552
+600
| +2% | +$30.7K |
|
Similar funds
Simplex Trading's Q3 2021 Portfolio in Review
As of Q3 2021, Simplex Trading held 10,062 positions worth $107B, up 3.4% from $104B the previous quarter. Its ten largest holdings account for 41% of the portfolio.
Trading was light in Q3 2021: portfolio turnover was 3.5%. Simplex Trading opened 86 new positions and exited 271, leaving the 10,062-position portfolio largely intact.
By sector, the portfolio is most concentrated in Technology at 0.49% of assets, up from 0.47% a quarter earlier, followed by Consumer Discretionary and Communication Services.
- Simplex Trading's largest Q3 2021 buy was Olo Inc: 143,230 shares worth $4.91M.
- Simplex Trading added most to GE Aerospace in Q3 2021, an estimated $36M increase.
- Simplex Trading's biggest Q3 2021 reduction was NVIDIA, cutting an estimated $25.9M.
- Simplex Trading fully exited Amazon in Q3 2021, selling an estimated $9.53M.
- Simplex Trading's ten largest holdings make up 41% of its $107B portfolio in Q3 2021.
- Simplex Trading opened 86 new positions and closed 271 in Q3 2021.
- Simplex Trading's portfolio value rose 3.4% quarter-over-quarter to $107B.
Based on Simplex Trading's 13F filing for Q3 2021, filed 28 Oct 2021.