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 | |
|---|---|---|---|---|---|---|
776
CALL
FirstEnergy
FE
$28.6B
| $9.02M | 0.01% |
239,500
-200
| -0.1% | -$7.59K |
|
777
CALL
Coupang
CPNG
$27.6B
| $8.99M | 0.01% |
216,600
-1,800
| -0.8% | -$62.2K |
|
778
PUT
Louisiana-Pacific
LPX
$5.03B
| $8.99M | 0.01% |
148,600
-200
| -0.1% | -$11.8K |
|
779
American Tower
AMT
$76.9B
| $8.96M | 0.01% |
33,159
+244
| +0.7% | +$69.6K |
|
780
CALL
Tencent Music
TME
$14.3B
| $8.96M | 0.01% |
579,300
+22,500
| +4% | +$221K |
|
781
Cleveland-Cliffs
CLF
$6.3B
| $8.96M | 0.01% |
406,096
+2,199
| +0.5% | +$50.1K |
|
782
CALL
Dave & Buster's
PLAY
$337M
| $8.95M | 0.01% |
219,600
+5,200
| +2% | +$188K |
|
783
Verizon
VZ
$184B
| $8.92M | 0.01% |
158,550
-15,763
| -9% | -$872K |
|
784
CALL
Align Technology
ALGN
$11.9B
| $8.91M | 0.01% |
14,400
-200
| -1% | -$136K |
|
785
CALL
First Majestic Silver
AG
$8.06B
| $8.9M | 0.01% |
569,600
+44,000
| +8% | +$568K |
|
|
JWN
786
PUT
DELISTED
Nordstrom
JWN
| $8.87M | 0.01% |
243,000
+100
| +0% | +$3.19K |
|
787
CALL
Fidelity National Information Services
FIS
$20.8B
| $8.87M | 0.01% |
61,700
| – | – |
|
788
Expedia Group
EXPE
$30.6B
| $8.86M | 0.01% |
53,062
+12,397
| +30% | +$1.92M |
|
789
CALL
Magna International
MGA
$17.7B
| $8.86M | 0.01% |
94,100
| – | – |
|
790
PUT
KB Home
KBH
$3.38B
| $8.84M | 0.01% |
211,300
-5,500
| -3% | -$228K |
|
791
CALL
Invesco DB Base Metals Fund
DBB
$306M
| $8.84M | 0.01% |
478,700
+13,800
| +3% | +$284K |
|
792
PUT
CSX Corp
CSX
$97.9B
| $8.83M | 0.01% |
273,600
+3,400
| +1% | +$109K |
|
793
PUT
PagSeguro Digital
PAGS
$2.62B
| $8.83M | 0.01% |
154,800
+100
| +0.1% | +$5.61K |
|
794
Morgan Stanley
MS
$337B
| $8.83M | 0.01% |
95,934
+13,746
| +17% | +$1.36M |
|
795
CALL
Academy Sports + Outdoors
ASO
$2.92B
| $8.82M | 0.01% |
212,500
-900
| -0.4% | -$35.9K |
|
796
CALL
Nutanix
NTNX
$14.2B
| $8.81M | 0.01% |
230,300
-6,400
| -3% | -$242K |
|
797
CALL
Linde
LIN
$234B
| $8.81M | 0.01% |
30,300
-1,200
| -4% | -$365K |
|
798
DraftKings
DKNG
$11.3B
| $8.8M | 0.01% |
169,859
+34,183
| +25% | +$1.81M |
|
799
PUT
Paycom
PAYC
$6.42B
| $8.78M | 0.01% |
23,500
+300
| +1% | +$134K |
|
800
PUT
Dropbox
DBX
$6.56B
| $8.77M | 0.01% |
290,100
+6,900
| +2% | +$214K |
|
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.