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 | |
|---|---|---|---|---|---|---|
3301
PUT
POSCO
PKX
$16.1B
| $543K | ﹤0.01% |
5,300
+4,900
| +1,225% | +$512K |
|
3302
MBIA
MBI
$282M
| $542K | ﹤0.01% |
75,288
+3,376
| +5% | +$28.1K |
|
3303
CALL
Ternium
TX
$9.37B
| $542K | ﹤0.01% |
13,600
-8,600
| -39% | -$355K |
|
3304
PUT
Nabors Industries
NBR
$1.16B
| $541K | ﹤0.01% |
4,400
+3,400
| +340% | +$395K |
|
3305
PUT
Rayonier Advanced Materials
RYAM
$573M
| $541K | ﹤0.01% |
153,000
-14,400
| -9% | -$54.1K |
|
|
FIRY
3306
PUT
Firy Inc
FIRY
$130M
| $541K | ﹤0.01% |
106,200
+7,200
| +7% | +$63.9K |
|
3307
CALL
BellRing Brands
BRBR
$1.52B
| $540K | ﹤0.01% |
13,100
-25,400
| -66% | -$974K |
|
3308
PUT
Canadian Imperial Bank of Commerce
CM
$108B
| $540K | ﹤0.01% |
14,000
-4,800
| -26% | -$198K |
|
3309
PUT
American Superconductor
AMSC
$1.48B
| $539K | ﹤0.01% |
71,400
+68,000
| +2,000% | +$564K |
|
|
CRON
3310
PUT
Cronos Group
CRON
$1.07B
| $539K | ﹤0.01% |
269,700
+229,000
| +563% | +$448K |
|
3311
PUT
Kyndryl
KD
$2.81B
| $539K | ﹤0.01% |
35,700
-346,400
| -91% | -$5.14M |
|
|
LUCK
3312
CALL
Lucky Strike Entertainment
LUCK
$963M
| $539K | ﹤0.01% |
56,100
+48,600
| +648% | +$534K |
|
3313
CALL
IHS Holding
IHS
$2.77B
| $538K | ﹤0.01% |
97,000
+96,400
| +16,067% | +$714K |
|
3314
PUT
Pembina Pipeline
PBA
$29B
| $538K | ﹤0.01% |
17,900
+4,700
| +36% | +$145K |
|
3315
PUT
Upwork
UPWK
$1.14B
| $538K | ﹤0.01% |
47,400
+29,400
| +163% | +$365K |
|
3316
PUT
Vista Energy
VIST
$7.42B
| $537K | ﹤0.01% |
17,700
-600
| -3% | -$15.7K |
|
3317
PUT
Workiva
WK
$3.13B
| $537K | ﹤0.01% |
5,300
-21,900
| -81% | -$2.28M |
|
|
EBIX
3318
PUT
DELISTED
Ebix Inc
EBIX
| $537K | ﹤0.01% |
54,400
-7,200
| -12% | -$140K |
|
3319
Lamar Advertising Co
LAMR
$16.3B
| $536K | ﹤0.01% |
+6,424
| New | +$590K |
|
|
GTM
3320
ZoomInfo Technologies
GTM
$908M
| $536K | ﹤0.01% |
+32,696
| New | +$668K |
|
|
BLUE
3321
PUT
DELISTED
bluebird bio
BLUE
| $535K | ﹤0.01% |
8,800
-405
| -4% | -$28.4K |
|
3322
PUT
Genuine Parts
GPC
$17.6B
| $534K | ﹤0.01% |
3,700
+1,000
| +37% | +$155K |
|
3323
CALL
LKQ Corp
LKQ
$6.69B
| $534K | ﹤0.01% |
10,800
+10,500
| +3,500% | +$562K |
|
3324
Mattel
MAT
$4.3B
| $534K | ﹤0.01% |
24,257
-57,286
| -70% | -$1.22M |
|
3325
PUT
MaxLinear
MXL
$5.88B
| $534K | ﹤0.01% |
24,000
+13,400
| +126% | +$341K |
|
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.