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 | |
|---|---|---|---|---|---|---|
2576
CALL
Enovis
ENOV
$1.56B
| $1.46M | ﹤0.01% |
18,127
| – | – |
|
2577
CALL
Zions Bancorporation
ZION
$10.1B
| $1.45M | ﹤0.01% |
27,000
+500
| +2% | +$27.5K |
|
|
RAD
2578
PUT
DELISTED
Rite Aid Corporation
RAD
| $1.45M | ﹤0.01% |
89,700
+16,600
| +23% | +$261K |
|
2579
FIGS
FIGS
$1.59B
| $1.45M | ﹤0.01% |
31,662
+10,551
| +50% | +$425K |
|
|
UXIN
2580
CALL
Uxin Ltd
UXIN
$330M
| $1.45M | ﹤0.01% |
3,822
-9
| -0.2% | -$2.97K |
|
|
ONEM
2581
CALL
DELISTED
1Life Healthcare
ONEM
| $1.45M | ﹤0.01% |
44,300
-800
| -2% | -$20.6K |
|
2582
Cameco
CCJ
$38.3B
| $1.45M | ﹤0.01% |
74,696
+17,283
| +30% | +$327K |
|
2583
PUT
EQT Corp
EQT
$33.2B
| $1.45M | ﹤0.01% |
65,300
+400
| +0.6% | +$7.74K |
|
2584
iShares JPMorgan USD Emerging Markets Bond ETF
EMB
$14.9B
| $1.44M | ﹤0.01% |
12,878
-3,979
| -24% | -$447K |
|
2585
CALL
Entergy
ETR
$54.1B
| $1.44M | ﹤0.01% |
28,400
+200
| +0.7% | +$10.7K |
|
2586
CALL
Curis
CRIS
$9.53M
| $1.44M | ﹤0.01% |
450
-3
| -0.7% | -$9.37K |
|
|
GOCO
2587
CALL
DELISTED
GoHealth
GOCO
| $1.44M | ﹤0.01% |
8,747
| – | – |
|
2588
NXP Semiconductors
NXPI
$68B
| $1.44M | ﹤0.01% |
7,136
-1,055
| -13% | -$219K |
|
2589
PUT
Peabody Energy
BTU
$2.78B
| $1.44M | ﹤0.01% |
175,500
+6,700
| +4% | +$87.8K |
|
2590
ProShares Short VIX Short-Term Futures ETF
SVXY
$220M
| $1.44M | ﹤0.01% |
51,298
-2,244
| -4% | -$62.5K |
|
2591
PUT
Vistra
VST
$55.1B
| $1.44M | ﹤0.01% |
76,100
-2,800
| -4% | -$51.7K |
|
2592
CALL
MPLX
MPLX
$59.5B
| $1.44M | ﹤0.01% |
48,100
| – | – |
|
|
NVTA
2593
DELISTED
Invitae Corporation
NVTA
| $1.44M | ﹤0.01% |
42,713
| – | – |
|
2594
PUT
Aurinia Pharmaceuticals
AUPH
$1.97B
| $1.43M | ﹤0.01% |
110,500
-300
| -0.3% | -$4.76K |
|
2595
PUT
Regions Financial
RF
$26.3B
| $1.43M | ﹤0.01% |
70,100
+200
| +0.3% | +$3.98K |
|
|
ASTR
2596
CALL
DELISTED
Astra Space, Inc. Class A Common Stock
ASTR
| $1.43M | ﹤0.01% |
7,400
+493
| +7% | +$75.3K |
|
2597
CALL
Rocket Pharmaceuticals
RCKT
$348M
| $1.43M | ﹤0.01% |
30,900
+100
| +0.3% | +$3.64K |
|
2598
PUT
Lattice Semiconductor
LSCC
$17.6B
| $1.43M | ﹤0.01% |
25,800
| – | – |
|
2599
Wabtec
WAB
$51.1B
| $1.43M | ﹤0.01% |
17,432
+3
| +0% | +$258 |
|
2600
CALL
LG Display
LPL
$3.17B
| $1.42M | ﹤0.01% |
133,300
| – | – |
|
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.