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 |
Amazon
AMZN
|
+$113M |
| 2 |
SPDR Gold Trust
GLD
|
+$68.6M |
| 3 |
NVIDIA
NVDA
|
+$63.4M |
| 4 |
iShares 20+ Year Treasury Bond ETF
TLT
|
+$55.2M |
| 5 |
Apple
AAPL
|
+$54.9M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
Netflix
NFLX
|
+$27.1M |
| 2 |
Qualcomm
QCOM
|
+$24.6M |
| 3 |
Walt Disney
DIS
|
+$21.2M |
| 4 |
Advanced Micro Devices
AMD
|
+$18.2M |
| 5 |
Snowflake
SNOW
|
+$16.1M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Technology | 0.44% |
| 2 | Consumer Discretionary | 0.32% |
| 3 | Healthcare | 0.22% |
| 4 | Financials | 0.17% |
| 5 | Communication Services | 0.15% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
6051
CALL
Ocugen
OCGN
$416M
| $38K | ﹤0.01% |
95,800
+6,700
| +8% | +$3.31K |
|
6052
PUT
Power Integrations
POWI
$3.38B
| $38K | ﹤0.01% |
500
-1,500
| -75% | -$128K |
|
6053
Selective Insurance
SIGI
$5.65B
| $38K | ﹤0.01% |
377
-1,629
| -81% | -$163K |
|
|
SLI
6054
PUT
Standard Lithium
SLI
$502M
| $38K | ﹤0.01% |
13,600
| – | – |
|
6055
GraniteShares 1.25x Long TSLA Daily ETF
TSL
$8.29M
| $38K | ﹤0.01% |
2,135
+1,984
| +1,314% | +$37.5K |
|
6056
PUT
Tyler Technologies
TYL
$12.7B
| $38K | ﹤0.01% |
100
-5,300
| -98% | -$2.08M |
|
6057
CALL
United States Antimony
UAMY
$751M
| $38K | ﹤0.01% |
103,500
-2,300
| -2% | -$913 |
|
|
NS
6058
PUT
DELISTED
NuStar Energy L.P.
NS
| $38K | ﹤0.01% |
2,200
-1,000
| -31% | -$17K |
|
|
JOAN
6059
DELISTED
JOANN, Inc. Common Stock
JOAN
| $38K | ﹤0.01% |
53,440
+23,015
| +76% | +$24.4K |
|
6060
CALL
American Homes 4 Rent
AMH
$12B
| $37K | ﹤0.01% |
1,100
| – | – |
|
6061
PUT
Anika Therapeutics
ANIK
$258M
| $37K | ﹤0.01% |
2,000
+1,100
| +122% | +$22.8K |
|
6062
PUT
Bakkt Inc
BKKT
$321M
| $37K | ﹤0.01% |
1,292
-200
| -13% | -$7.08K |
|
6063
Amdocs
DOX
$5.92B
| $37K | ﹤0.01% |
442
-47
| -10% | -$4.25K |
|
|
DSL
6064
PUT
DoubleLine Income Solutions Fund
DSL
$1.22B
| $37K | ﹤0.01% |
3,200
+2,300
| +256% | +$27.5K |
|
6065
PUT
Ezcorp Inc
EZPW
$1.83B
| $37K | ﹤0.01% |
4,500
-2,500
| -36% | -$21.5K |
|
|
GAMB
6066
CALL
DELISTED
Gambling.com
GAMB
| $37K | ﹤0.01% |
2,900
+1,100
| +61% | +$13.9K |
|
6067
GSI Technology
GSIT
$215M
| $37K | ﹤0.01% |
13,658
-9,706
| -42% | -$37.7K |
|
6068
PUT
IDT Corp
IDT
$1.64B
| $37K | ﹤0.01% |
1,700
+1,500
| +750% | +$35.3K |
|
6069
PUT
Disc Medicine
IRON
$2.96B
| $37K | ﹤0.01% |
800
-400
| -33% | -$20K |
|
6070
PUT
Lennox International
LII
$14.4B
| $37K | ﹤0.01% |
100
| – | – |
|
|
NFGC
6071
PUT
New Found Gold
NFGC
$522M
| $37K | ﹤0.01% |
9,000
-3,000
| -25% | -$13.6K |
|
|
NIU
6072
Niu Technologies
NIU
$203M
| $37K | ﹤0.01% |
13,167
+596
| +5% | +$2.08K |
|
6073
CALL
Pricesmart
PSMT
$5.98B
| $37K | ﹤0.01% |
+500
| New | +$38.6K |
|
6074
CALL
Quanterix
QTRX
$164M
| $37K | ﹤0.01% |
1,400
-2,500
| -64% | -$61.9K |
|
6075
CALL
Stoke Therapeutics
STOK
$1.8B
| $37K | ﹤0.01% |
9,600
-1,300
| -12% | -$8.55K |
|
Similar funds
Simplex Trading's Q3 2023 Portfolio in Review
As of Q3 2023, Simplex Trading held 10,417 positions worth $127B, up 4.5% from $122B the previous quarter. Its ten largest holdings account for 44% of the portfolio.
Simplex Trading deployed $11.9B of net new capital in Q3 2023, opening 1,399 new positions and adding to 3,690 existing holdings. Its largest new stake was Amazon: 841,102 shares worth $107M.
By sector, the portfolio is most concentrated in Technology at 0.44% of assets, up from 0.41% a quarter earlier, followed by Consumer Discretionary and Healthcare.
On the sell side, the largest reduction was Netflix, an estimated $27.1M trimmed.
- Simplex Trading's largest Q3 2023 buy was Amazon: 841,102 shares worth $107M.
- Simplex Trading added most to SPDR Gold Trust in Q3 2023, an estimated $68.6M increase.
- Simplex Trading's biggest Q3 2023 reduction was Netflix, cutting an estimated $27.1M.
- Simplex Trading fully exited Qualcomm in Q3 2023, selling an estimated $24.6M.
- Simplex Trading's ten largest holdings make up 44% of its $127B portfolio in Q3 2023.
- Simplex Trading opened 1,399 new positions and closed 1,719 in Q3 2023.
- Simplex Trading's portfolio value rose 4.5% quarter-over-quarter to $127B.
Based on Simplex Trading's 13F filing for Q3 2023, filed 1 Nov 2023.