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 | |
|---|---|---|---|---|---|---|
7251
CALL
La-Z-Boy
LZB
$1.65B
| $9K | ﹤0.01% |
300
-7,700
| -96% | -$237K |
|
|
MAPS
7252
DELISTED
WM TECHNOLOGY INC A
MAPS
| $9K | ﹤0.01% |
+7,438
| New | +$8.96K |
|
|
ORIO
7253
PUT
Orion Digital Corp
ORIO
$15.6M
| $9K | ﹤0.01% |
+6,100
| New | +$11.7K |
|
7254
CALL
Noodles & Co
NDLS
$88.5M
| $9K | ﹤0.01% |
500
-175
| -26% | -$4.22K |
|
|
NIU
7255
PUT
Niu Technologies
NIU
$209M
| $9K | ﹤0.01% |
3,500
+900
| +35% | +$3.14K |
|
|
NTST
7256
NETSTREIT Corp
NTST
$2.13B
| $9K | ﹤0.01% |
625
+564
| +925% | +$9.72K |
|
|
PKST
7257
DELISTED
Peakstone Realty Trust
PKST
| $9K | ﹤0.01% |
+580
| New | +$12.3K |
|
7258
PUT
ProQR Therapeutics
PRQR
$244M
| $9K | ﹤0.01% |
7,500
-4,700
| -39% | -$7.39K |
|
7259
PUT
Prothena Corp
PRTA
$439M
| $9K | ﹤0.01% |
200
-13,000
| -98% | -$772K |
|
7260
CALL
FreightCar America
RAIL
$275M
| $9K | ﹤0.01% |
3,700
-100
| -3% | -$285 |
|
7261
CALL
Red Cat Holdings
RCAT
$1.12B
| $9K | ﹤0.01% |
9,500
-100
| -1% | -$102 |
|
7262
Riley Exploration Permian
REPX
$716M
| $9K | ﹤0.01% |
290
-1,036
| -78% | -$35.2K |
|
7263
PUT
Ryanair
RYAAY
$30.9B
| $9K | ﹤0.01% |
250
-1,500
| -86% | -$60.9K |
|
7264
PUT
Sally Beauty Holdings
SBH
$1.46B
| $9K | ﹤0.01% |
1,100
+600
| +120% | +$6.37K |
|
|
SOND
7265
DELISTED
Sonder
SOND
| $9K | ﹤0.01% |
1,211
+202
| +20% | +$1.97K |
|
7266
Spire
SR
$4.93B
| $9K | ﹤0.01% |
161
+67
| +71% | +$4.06K |
|
7267
PUT
Sasol
SSL
$7.07B
| $9K | ﹤0.01% |
700
+400
| +133% | +$5.25K |
|
7268
CALL
ReposiTrak
TRAK
$161M
| $9K | ﹤0.01% |
1,100
+800
| +267% | +$7.37K |
|
|
TRST
7269
Trustco Bank Corp NY
TRST
$994M
| $9K | ﹤0.01% |
334
+223
| +201% | +$6.43K |
|
7270
United States 12 Month Oil Fund,
USL
$43.3M
| $9K | ﹤0.01% |
226
| – | – |
|
|
VERV
7271
PUT
DELISTED
Verve Therapeutics
VERV
| $9K | ﹤0.01% |
700
| – | – |
|
7272
PUT
VOC Energy
VOC
$58M
| $9K | ﹤0.01% |
1,000
+600
| +150% | +$5.21K |
|
|
VRNT
7273
CALL
DELISTED
Verint Systems
VRNT
| $9K | ﹤0.01% |
400
-15,400
| -97% | -$497K |
|
7274
Wrap Technologies
WRAP
$95.3M
| $9K | ﹤0.01% |
6,193
-2,848
| -32% | -$4.78K |
|
7275
CALL
Wave Life Sciences
WVE
$1.14B
| $9K | ﹤0.01% |
+1,700
| New | +$7.76K |
|
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.