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 | |
|---|---|---|---|---|---|---|
|
TMPO
1626
CALL
DELISTED
Tempo Automation Holdings, Inc. Common Stock
TMPO
| $3.15M | ﹤0.01% |
316,300
| – | – |
|
|
ZH
1627
PUT
Zhihu
ZH
$270M
| $3.15M | ﹤0.01% |
41,750
+33
| +0.1% | +$1.98K |
|
|
NBIS
1628
PUT
Nebius Group N.V.
NBIS
$47.7B
| $3.14M | ﹤0.01% |
44,600
| – | – |
|
1629
Costco
COST
$415B
| $3.13M | ﹤0.01% |
7,939
+1,816
| +30% | +$798K |
|
1630
ProShares Ultra Bloomberg Crude Oil
UCO
$443M
| $3.13M | ﹤0.01% |
155,840
-7,412
| -5% | -$138K |
|
|
TWO
1631
CALL
Two Harbors Investment
TWO
$1.27B
| $3.11M | ﹤0.01% |
102,675
-75
| -0.1% | -$1.97K |
|
|
VTNR
1632
PUT
DELISTED
Vertex Energy, Inc
VTNR
| $3.11M | ﹤0.01% |
258,400
+7,900
| +3% | +$62.8K |
|
1633
CALL
Rockwell Automation
ROK
$51.4B
| $3.11M | ﹤0.01% |
10,900
| – | – |
|
1634
PUT
Haemonetics
HAE
$3.58B
| $3.11M | ﹤0.01% |
45,900
| – | – |
|
1635
Microvision
MVIS
$88.2M
| $3.1M | ﹤0.01% |
189,368
+6,690
| +4% | +$93K |
|
1636
PUT
Mattel
MAT
$4.17B
| $3.1M | ﹤0.01% |
152,600
| – | – |
|
|
CYBR
1637
PUT
DELISTED
CyberArk
CYBR
| $3.09M | ﹤0.01% |
23,500
| – | – |
|
1638
PUT
Wabtec
WAB
$51.1B
| $3.09M | ﹤0.01% |
37,800
-200
| -0.5% | -$17.2K |
|
1639
PUT
Copart
CPRT
$25.9B
| $3.09M | ﹤0.01% |
92,000
| – | – |
|
1640
CALL
PG&E
PCG
$47.8B
| $3.09M | ﹤0.01% |
299,000
+300
| +0.1% | +$2.83K |
|
1641
CALL
Revolve Group
RVLV
$1.79B
| $3.09M | ﹤0.01% |
43,500
+1,000
| +2% | +$65.1K |
|
1642
CALL
Element Solutions
ESI
$9.12B
| $3.09M | ﹤0.01% |
129,700
-300
| -0.2% | -$6.85K |
|
1643
PUT
Melco Resorts & Entertainment
MLCO
$2.1B
| $3.09M | ﹤0.01% |
184,500
-5,300
| -3% | -$69.7K |
|
1644
CALL
Adient
ADNT
$1.6B
| $3.08M | ﹤0.01% |
68,300
| – | – |
|
1645
PUT
Celsius Holdings
CELH
$6.93B
| $3.08M | ﹤0.01% |
127,200
+900
| +0.7% | +$23.1K |
|
1646
Amplify Junior Silver Miners ETF
SILJ
$3.27B
| $3.08M | ﹤0.01% |
203,698
| – | – |
|
1647
CVS Health
CVS
$137B
| $3.07M | ﹤0.01% |
37,397
+518
| +1% | +$43.4K |
|
1648
CALL
Dolby
DLB
$4.72B
| $3.07M | ﹤0.01% |
30,800
| – | – |
|
1649
PUT
Playboy Inc
PLBY
$141M
| $3.06M | ﹤0.01% |
81,000
+600
| +0.7% | +$16.1K |
|
1650
PUT
Viatris
VTRS
$20.1B
| $3.05M | ﹤0.01% |
207,100
+1,400
| +0.7% | +$19.9K |
|
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.