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 | |
|---|---|---|---|---|---|---|
4551
Century Aluminum
CENX
$4.22B
| $372K | ﹤0.01% |
29,573
-3,077
| -9% | -$38.7K |
|
|
PLYA
4552
DELISTED
Playa Hotels & Resorts
PLYA
| $372K | ﹤0.01% |
50,802
| – | – |
|
|
RC
4553
CALL
Ready Capital
RC
$260M
| $372K | ﹤0.01% |
23,100
+500
| +2% | +$7.58K |
|
|
API
4554
Agora
API
$333M
| $371K | ﹤0.01% |
8,960
-2,300
| -20% | -$71.7K |
|
4555
CALL
Rigel Pharmaceuticals
RIGL
$723M
| $371K | ﹤0.01% |
8,250
+80
| +1% | +$3.15K |
|
4556
PUT
RB Global
RBA
$21.5B
| $370K | ﹤0.01% |
6,200
| – | – |
|
4557
ZK International Group
ZKIN
$71.6M
| $370K | ﹤0.01% |
12,514
+14
| +0.1% | +$332 |
|
|
INFO
4558
DELISTED
IHS Markit Ltd. Common Shares
INFO
| $370K | ﹤0.01% |
3,274
-24
| -0.7% | -$2.83K |
|
4559
CALL
Amkor Technology
AMKR
$10.6B
| $369K | ﹤0.01% |
15,900
+1,600
| +11% | +$40.8K |
|
4560
ArcBest
ARCB
$3.15B
| $369K | ﹤0.01% |
6,137
+449
| +8% | +$29.6K |
|
4561
Cadiz
CDZI
$251M
| $369K | ﹤0.01% |
25,616
+2,500
| +11% | +$30.7K |
|
4562
CALL
Columbia Sportswear
COLM
$3.25B
| $369K | ﹤0.01% |
3,700
| – | – |
|
4563
CALL
Axsome Therapeutics
AXSM
$11.7B
| $368K | ﹤0.01% |
5,400
| – | – |
|
4564
CALL
Kelly Services Class A
KELYA
$548M
| $368K | ﹤0.01% |
+15,200
| New | +$318K |
|
4565
PUT
Ring Energy
REI
$307M
| $368K | ﹤0.01% |
113,800
+2,800
| +3% | +$7.14K |
|
4566
Transocean
RIG
$5.48B
| $368K | ﹤0.01% |
74,441
+2,706
| +4% | +$9.84K |
|
4567
Autoliv
ALV
$9.14B
| $367K | ﹤0.01% |
3,751
| – | – |
|
4568
CALL
Gray Television
GTN
$437M
| $367K | ﹤0.01% |
15,300
| – | – |
|
4569
Huntington Bancshares
HBAN
$34B
| $367K | ﹤0.01% |
25,453
+1,013
| +4% | +$14.9K |
|
4570
CALL
MannKind Corp
MNKD
$1.19B
| $367K | ﹤0.01% |
67,100
+500
| +0.8% | +$2.25K |
|
4571
Invesco BuyBack Achievers ETF
PKW
$1.72B
| $367K | ﹤0.01% |
4,050
+300
| +8% | +$27.6K |
|
4572
PUT
Rekor Systems
REKR
$82.6M
| $367K | ﹤0.01% |
35,900
| – | – |
|
|
NBRV
4573
CALL
DELISTED
Nabriva Therapeutics plc Ordinary Shares Ireland
NBRV
| $367K | ﹤0.01% |
11,316
+8
| +0.1% | +$226 |
|
4574
Middleby
MIDD
$6.01B
| $366K | ﹤0.01% |
2,117
| – | – |
|
4575
PUT
Meritage Homes
MTH
$4.78B
| $366K | ﹤0.01% |
7,600
| – | – |
|
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.