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 | |
|---|---|---|---|---|---|---|
2651
CALL
Cardlytics
CDLX
$21M
| $1.37M | ﹤0.01% |
1,070
| – | – |
|
2652
TG Therapeutics
TGTX
$8.58B
| $1.37M | ﹤0.01% |
33,947
-3,000
| -8% | -$92.8K |
|
|
VXRT
2653
PUT
DELISTED
Vaxart
VXRT
| $1.37M | ﹤0.01% |
178,700
+7,000
| +4% | +$57.6K |
|
|
VG
2654
CALL
DELISTED
Vonage Holdings Corporation
VG
| $1.37M | ﹤0.01% |
95,000
+100
| +0.1% | +$1.45K |
|
2655
CALL
Pitney Bowes
PBI
$2.42B
| $1.37M | ﹤0.01% |
156,100
+600
| +0.4% | +$4.7K |
|
|
ZGNX
2656
PUT
DELISTED
Zogenix, Inc.
ZGNX
| $1.37M | ﹤0.01% |
74,200
| – | – |
|
2657
CALL
Matador Resources
MTDR
$6.31B
| $1.37M | ﹤0.01% |
37,300
+300
| +0.8% | +$9.2K |
|
2658
PUT
Saic
SAIC
$5.03B
| $1.37M | ﹤0.01% |
15,500
| – | – |
|
|
SUM
2659
PUT
DELISTED
Summit Materials, Inc. Class A Common Stock
SUM
| $1.37M | ﹤0.01% |
39,866
| – | – |
|
2660
Kinross Gold
KGC
$28.5B
| $1.37M | ﹤0.01% |
214,936
+9,686
| +5% | +$58K |
|
2661
iShares MSCI China ETF
MCHI
$6.04B
| $1.37M | ﹤0.01% |
16,716
-144
| -0.9% | -$10.4K |
|
2662
CALL
Qfin Holdings
QFIN
$1.61B
| $1.36M | ﹤0.01% |
35,200
-100
| -0.3% | -$2.36K |
|
2663
PUT
SSR Mining
SSRM
$5.57B
| $1.36M | ﹤0.01% |
87,900
+300
| +0.3% | +$4.75K |
|
2664
CALL
Xcel Energy
XEL
$51B
| $1.36M | ﹤0.01% |
20,300
+100
| +0.5% | +$6.76K |
|
2665
CALL
GDS Holdings
GDS
$6.34B
| $1.36M | ﹤0.01% |
17,900
+100
| +0.6% | +$6.16K |
|
|
GRMN
2666
PUT
Garmin
GRMN
$46.9B
| $1.36M | ﹤0.01% |
9,300
| – | – |
|
2667
CALL
Wabtec
WAB
$51.1B
| $1.36M | ﹤0.01% |
16,600
| – | – |
|
2668
CALL
CubeSmart
CUBE
$9.53B
| $1.36M | ﹤0.01% |
29,300
-300
| -1% | -$15.1K |
|
2669
CALL
nCino
NCNO
$1.81B
| $1.35M | ﹤0.01% |
22,100
-100
| -0.5% | -$6.67K |
|
2670
PennyMac Financial
PFSI
$4.38B
| $1.35M | ﹤0.01% |
22,476
+1,401
| +7% | +$89K |
|
|
RADA
2671
DELISTED
Rada Electronic Industries Ltd
RADA
| $1.35M | ﹤0.01% |
114,282
+45
| +0% | +$519 |
|
|
HA
2672
CALL
DELISTED
Hawaiian Holdings, Inc.
HA
| $1.35M | ﹤0.01% |
54,300
+1,300
| +2% | +$26.6K |
|
2673
Envista
NVST
$4.28B
| $1.35M | ﹤0.01% |
30,853
| – | – |
|
2674
PUT
Range Resources
RRC
$9.11B
| $1.35M | ﹤0.01% |
80,200
+100
| +0.1% | +$1.62K |
|
2675
Walt Disney
DIS
$165B
| $1.34M | ﹤0.01% |
7,585
+730
| +11% | +$130K |
|
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.