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 | |
|---|---|---|---|---|---|---|
2376
CALL
Elanco Animal Health
ELAN
$12.4B
| $1.7M | ﹤0.01% |
48,600
| – | – |
|
2377
CALL
Manulife Financial
MFC
$72.6B
| $1.7M | ﹤0.01% |
85,700
| – | – |
|
2378
PUT
Methanex
MEOH
$4.32B
| $1.7M | ﹤0.01% |
50,400
-200
| -0.4% | -$7.23K |
|
2379
CALL
Alamos Gold
AGI
$12.4B
| $1.69M | ﹤0.01% |
222,400
+400
| +0.2% | +$3.08K |
|
2380
CALL
American Well
AMWL
$181M
| $1.69M | ﹤0.01% |
6,700
-15
| -0.2% | -$3.25K |
|
2381
CALL
Blue Owl Capital
OWL
$6.39B
| $1.69M | ﹤0.01% |
132,800
-800
| -0.6% | -$11.1K |
|
2382
CALL
Flex
FLEX
$43.4B
| $1.69M | ﹤0.01% |
126,198
| – | – |
|
|
OPTU
2383
PUT
Optimum Communications Inc
OPTU
$316M
| $1.69M | ﹤0.01% |
48,800
| – | – |
|
2384
CALL
Baxter International
BAX
$11.6B
| $1.69M | ﹤0.01% |
20,700
| – | – |
|
2385
Prudential Financial
PRU
$41.7B
| $1.69M | ﹤0.01% |
16,327
| – | – |
|
2386
Dropbox
DBX
$6.81B
| $1.69M | ﹤0.01% |
55,779
+13,160
| +31% | +$409K |
|
|
VTNR
2387
CALL
DELISTED
Vertex Energy, Inc
VTNR
| $1.69M | ﹤0.01% |
140,000
+24,300
| +21% | +$193K |
|
2388
CALL
Omnicom Group
OMC
$22.7B
| $1.68M | ﹤0.01% |
20,800
+100
| +0.5% | +$7.43K |
|
|
AUY
2389
PUT
DELISTED
Yamana Gold, Inc.
AUY
| $1.68M | ﹤0.01% |
401,900
-200
| -0% | -$847 |
|
2390
Planet Fitness
PLNT
$4.23B
| $1.68M | ﹤0.01% |
22,306
| – | – |
|
|
QNGY
2391
CALL
DELISTED
Quanergy Systems, Inc.
QNGY
| $1.68M | ﹤0.01% |
8,485
+2,190
| +35% | +$435K |
|
|
XONE
2392
PUT
DELISTED
The ExOne Company
XONE
| $1.68M | ﹤0.01% |
79,900
| – | – |
|
2393
CALL
CNX Resources
CNX
$4.85B
| $1.68M | ﹤0.01% |
121,500
-100
| -0.1% | -$1.21K |
|
2394
AdvisorShares Pure US Cannabis ETF
MSOS
$864M
| $1.68M | ﹤0.01% |
40,956
-934
| -2% | -$32.4K |
|
2395
CALL
Trane Technologies
TT
$106B
| $1.68M | ﹤0.01% |
9,000
+100
| +1% | +$19.2K |
|
2396
CALL
National Grid
NGG
$82.7B
| $1.67M | ﹤0.01% |
29,626
| – | – |
|
2397
CALL
Telus
TU
$16B
| $1.67M | ﹤0.01% |
74,500
+100
| +0.1% | +$2.25K |
|
2398
PUT
MP Materials
MP
$7.35B
| $1.67M | ﹤0.01% |
44,400
-1,800
| -4% | -$62.6K |
|
|
CYBR
2399
DELISTED
CyberArk
CYBR
| $1.67M | ﹤0.01% |
12,698
+500
| +4% | +$76K |
|
|
PSXP
2400
PUT
DELISTED
PHILLIPS 66 PARTNERS LP
PSXP
| $1.67M | ﹤0.01% |
41,500
+1,100
| +3% | +$40.2K |
|
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.