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 | |
|---|---|---|---|---|---|---|
|
FLNA
2351
PUT
Filana Therapeutics
FLNA
$43M
| $1.44M | ﹤0.01% |
86,600
-24,300
| -22% | -$482K |
|
2352
CALL
Lantheus
LNTH
$6.82B
| $1.44M | ﹤0.01% |
20,700
-7,000
| -25% | -$512K |
|
2353
CALL
Terex
TEX
$7.98B
| $1.43M | ﹤0.01% |
24,900
+8,100
| +48% | +$483K |
|
|
XELA
2354
CALL
DELISTED
Exela Technologies, Inc. Common Stock
XELA
| $1.43M | ﹤0.01% |
339,900
-1,200
| -0.4% | -$5.55K |
|
2355
CALL
Aramark
ARMK
$15B
| $1.43M | ﹤0.01% |
57,201
-7,202
| -11% | -$202K |
|
|
2356
Netflix
NFLX
$292B
| $1.43M | ﹤0.01% |
37,900
-639,590
| -94% | -$27.1M |
|
2357
PUT
Brunswick
BC
$5.19B
| $1.43M | ﹤0.01% |
18,100
+13,800
| +321% | +$1.14M |
|
2358
CALL
Principal Financial Group
PFG
$23.6B
| $1.43M | ﹤0.01% |
19,800
+17,100
| +633% | +$1.33M |
|
|
AZUL
2359
CALL
DELISTED
Azul
AZUL
| $1.43M | ﹤0.01% |
165,900
+63,500
| +62% | +$630K |
|
2360
PUT
Labcorp
LH
$24.3B
| $1.41M | ﹤0.01% |
103,300
-10,190
| -9% | -$2.15M |
|
2361
PUT
Jazz Pharmaceuticals
JAZZ
$15.9B
| $1.41M | ﹤0.01% |
10,900
+9,400
| +627% | +$1.25M |
|
2362
PUT
Xenon Pharmaceuticals
XENE
$6.32B
| $1.41M | ﹤0.01% |
41,300
+38,300
| +1,277% | +$1.43M |
|
2363
CALL
Dole
DOLE
$1.35B
| $1.41M | ﹤0.01% |
121,700
-77,500
| -39% | -$968K |
|
2364
PUT
Banco Bradesco
BBD
$38.1B
| $1.41M | ﹤0.01% |
493,550
-7,200
| -1% | -$22.8K |
|
2365
Eversource Energy
ES
$28.2B
| $1.4M | ﹤0.01% |
+24,145
| New | +$1.61M |
|
2366
CALL
Invesco Mortgage Capital
IVR
$776M
| $1.4M | ﹤0.01% |
139,600
+18,500
| +15% | +$204K |
|
2367
JetBlue
JBLU
$1.96B
| $1.4M | ﹤0.01% |
303,902
+221,579
| +269% | +$1.46M |
|
|
FL
2368
CALL
DELISTED
Foot Locker
FL
| $1.4M | ﹤0.01% |
80,500
-21,500
| -21% | -$481K |
|
2369
PUT
KBR
KBR
$4.68B
| $1.4M | ﹤0.01% |
23,700
+22,600
| +2,055% | +$1.39M |
|
2370
Ovintiv
OVV
$17.5B
| $1.39M | ﹤0.01% |
29,266
+16,185
| +124% | +$733K |
|
2371
Thor Industries
THO
$3.99B
| $1.39M | ﹤0.01% |
14,628
+5,321
| +57% | +$556K |
|
2372
PUT
Biohaven
BHVN
$2.16B
| $1.39M | ﹤0.01% |
53,400
-13,200
| -20% | -$274K |
|
2373
CALL
Kosmos Energy
KOS
$1.56B
| $1.39M | ﹤0.01% |
169,700
-31,200
| -16% | -$221K |
|
2374
Annaly Capital Management
NLY
$16.9B
| $1.39M | ﹤0.01% |
73,725
-15,136
| -17% | -$301K |
|
2375
CALL
iRhythm Holdings
IRTC
$3.59B
| $1.39M | ﹤0.01% |
14,700
+1,200
| +9% | +$122K |
|
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.