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 | |
|---|---|---|---|---|---|---|
3501
CALL
Babcock & Wilcox
BW
$1.3B
| $458K | ﹤0.01% |
108,800
+19,600
| +22% | +$102K |
|
3502
PUT
Brinker International
EAT
$8.45B
| $458K | ﹤0.01% |
14,500
-10,700
| -42% | -$374K |
|
|
PPLI
3503
CALL
People Inc
PPLI
$3.14B
| $458K | ﹤0.01% |
11,093
+6,217
| +128% | +$302K |
|
3504
iShares US Regional Banks ETF
IAT
$679M
| $457K | ﹤0.01% |
13,603
-9,645
| -41% | -$347K |
|
3505
CALL
Evergy
EVRG
$19.9B
| $456K | ﹤0.01% |
9,000
-5,300
| -37% | -$301K |
|
3506
PUT
MannKind Corp
MNKD
$1.2B
| $456K | ﹤0.01% |
110,500
+30,400
| +38% | +$137K |
|
3507
PUT
Aaon
AAON
$7.73B
| $454K | ﹤0.01% |
8,000
+7,550
| +1,678% | +$480K |
|
3508
Accel Entertainment
ACEL
$1.02B
| $453K | ﹤0.01% |
41,439
-39,742
| -49% | -$443K |
|
3509
CALL
ACV Auctions
ACVA
$1.43B
| $452K | ﹤0.01% |
29,800
-2,600
| -8% | -$42.2K |
|
3510
CALL
NuScale Power
SMR
$2.82B
| $452K | ﹤0.01% |
92,300
+4,100
| +5% | +$27K |
|
3511
Warby Parker
WRBY
$3.17B
| $452K | ﹤0.01% |
34,348
+21,754
| +173% | +$283K |
|
3512
PUT
nCino
NCNO
$2.04B
| $451K | ﹤0.01% |
14,200
+6,500
| +84% | +$201K |
|
3513
PUT
SS&C Technologies
SSNC
$18.7B
| $451K | ﹤0.01% |
8,600
+3,800
| +79% | +$217K |
|
3514
PUT
Fiverr
FVRR
$418M
| $450K | ﹤0.01% |
18,400
-5,900
| -24% | -$166K |
|
3515
Ferrari
RACE
$68.5B
| $450K | ﹤0.01% |
+1,524
| New | +$473K |
|
3516
CALL
Smith & Wesson
SWBI
$658M
| $450K | ﹤0.01% |
34,900
-6,900
| -17% | -$86.2K |
|
3517
CALL
Eagle Materials
EXP
$6.81B
| $449K | ﹤0.01% |
2,700
-2,300
| -46% | -$418K |
|
3518
PUT
Fabrinet
FN
$15.9B
| $449K | ﹤0.01% |
2,700
-2,300
| -46% | -$319K |
|
|
HAPN
3519
Happen Inc
HAPN
$2.17B
| $449K | ﹤0.01% |
73,748
+40,022
| +119% | +$311K |
|
3520
CALL
Booz Allen Hamilton
BAH
$8.79B
| $448K | ﹤0.01% |
4,100
-7,800
| -66% | -$897K |
|
3521
CALL
Shutterstock
SSTK
$219M
| $448K | ﹤0.01% |
11,800
+4,200
| +55% | +$188K |
|
|
OPTU
3522
CALL
Optimum Communications Inc
OPTU
$301M
| $447K | ﹤0.01% |
137,000
+39,700
| +41% | +$128K |
|
3523
PUT
Hims & Hers Health
HIMS
$6.75B
| $447K | ﹤0.01% |
71,200
+4,500
| +7% | +$33.5K |
|
3524
CALL
Azenta
AZTA
$1.33B
| $446K | ﹤0.01% |
8,900
-105,600
| -92% | -$5.31M |
|
3525
CALL
Beazer Homes USA
BZH
$911M
| $445K | ﹤0.01% |
17,900
+13,900
| +348% | +$401K |
|
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.