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 | |
|---|---|---|---|---|---|---|
676
PUT
Aon
AON
$75.1B
| $11.1M | 0.01% |
46,500
+100
| +0.2% | +$26.9K |
|
677
PUT
Harley-Davidson
HOG
$2.81B
| $11.1M | 0.01% |
235,800
-200
| -0.1% | -$8.06K |
|
678
PUT
MGM Resorts International
MGM
$11.5B
| $11.1M | 0.01% |
254,000
-1,600
| -0.6% | -$65.2K |
|
679
CALL
SoFi Technologies
SOFI
$21.5B
| $11M | 0.01% |
605,400
+13,300
| +2% | +$208K |
|
680
CALL
APA Corp
APA
$13.3B
| $11M | 0.01% |
502,900
+34,000
| +7% | +$650K |
|
681
CALL
Gaotu Techedu
GOTU
$389M
| $11M | 0.01% |
767,300
+19,600
| +3% | +$98.9K |
|
682
CALL
Mondelez International
MDLZ
$77.2B
| $11M | 0.01% |
176,000
+400
| +0.2% | +$24.9K |
|
683
PUT
NXP Semiconductors
NXPI
$69.9B
| $11M | 0.01% |
54,300
+1,800
| +3% | +$374K |
|
|
FLNA
684
PUT
Filana Therapeutics
FLNA
$43.8M
| $10.9M | 0.01% |
123,300
-800
| -0.6% | -$66.8K |
|
685
FuboTV Inc
FUBO
$256M
| $10.9M | 0.01% |
29,379
+11,476
| +64% | +$3.76M |
|
686
CALL
Teva Pharmaceuticals
TEVA
$35.5B
| $10.9M | 0.01% |
1,100,000
+6,300
| +0.6% | +$59K |
|
687
CALL
Automatic Data Processing
ADP
$96.6B
| $10.9M | 0.01% |
54,500
+1,200
| +2% | +$247K |
|
688
CALL
Lumen
LUMN
$6.73B
| $10.9M | 0.01% |
790,300
+31,200
| +4% | +$391K |
|
689
PUT
Synopsys
SNPS
$72.2B
| $10.8M | 0.01% |
39,000
| – | – |
|
690
PUT
Kohl's
KSS
$2.06B
| $10.8M | 0.01% |
195,400
+300
| +0.2% | +$16K |
|
691
PUT
CME Group
CME
$91.6B
| $10.8M | 0.01% |
50,200
+1,800
| +4% | +$365K |
|
|
SBNY
692
PUT
DELISTED
Signature Bank
SBNY
| $10.7M | 0.01% |
43,000
| – | – |
|
693
PUT
Weyerhaeuser
WY
$17B
| $10.7M | 0.01% |
312,300
+1,400
| +0.5% | +$49K |
|
694
CALL
Paysafe
PSFE
$395M
| $10.7M | 0.01% |
75,867
-1,866
| -2% | -$214K |
|
695
Applied Materials
AMAT
$453B
| $10.7M | 0.01% |
77,413
-6,769
| -8% | -$919K |
|
696
PUT
Keysight
KEYS
$56.5B
| $10.7M | 0.01% |
69,500
+100
| +0.1% | +$16.8K |
|
697
CALL
ASML
ASML
$694B
| $10.7M | 0.01% |
15,700
+700
| +5% | +$550K |
|
698
CALL
Marriott International
MAR
$95.7B
| $10.6M | 0.01% |
76,400
+9,800
| +15% | +$1.37M |
|
699
PUT
NetEase
NTES
$77B
| $10.6M | 0.01% |
93,200
+5,100
| +6% | +$482K |
|
700
PUT
Teleflex
TFX
$5.9B
| $10.6M | 0.01% |
26,000
| – | – |
|
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.