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 | |
|---|---|---|---|---|---|---|
5001
CALL
GoPro
GPRO
$124M
| $108K | ﹤0.01% |
34,400
-5,900
| -15% | -$22.4K |
|
5002
PUT
Lifecore Biomedical
LFCR
$164M
| $108K | ﹤0.01% |
14,400
-123,100
| -90% | -$1.13M |
|
5003
iShares MBS ETF
MBB
$39.1B
| $108K | ﹤0.01% |
+1,217
| New | +$111K |
|
5004
Relay Therapeutics
RLAY
$4.24B
| $108K | ﹤0.01% |
12,945
+2,353
| +22% | +$25.3K |
|
5005
PUT
Root
ROOT
$919M
| $108K | ﹤0.01% |
11,400
-35,400
| -76% | -$367K |
|
5006
Taboola.com
TBLA
$1.39B
| $108K | ﹤0.01% |
28,541
+10,027
| +54% | +$35.3K |
|
5007
PUT
Zentalis Pharmaceuticals
ZNTL
$350M
| $108K | ﹤0.01% |
5,400
+4,100
| +315% | +$104K |
|
5008
CALL
AAR Corp
AIR
$5.56B
| $107K | ﹤0.01% |
+1,800
| New | +$107K |
|
5009
Box
BOX
$4.31B
| $107K | ﹤0.01% |
+4,445
| New | +$127K |
|
5010
Coca-Cola Europacific Partners
CCEP
$49.3B
| $107K | ﹤0.01% |
1,720
-72
| -4% | -$4.58K |
|
5011
CALL
Clarivate
CLVT
$1.29B
| $107K | ﹤0.01% |
16,000
-283,400
| -95% | -$2.26M |
|
|
XRN
5012
PUT
Chiron Real Estate Inc
XRN
$516M
| $107K | ﹤0.01% |
2,400
-680
| -22% | -$32.6K |
|
5013
CALL
Idaho Strategic Resources
IDR
$462M
| $107K | ﹤0.01% |
21,300
-28,000
| -57% | -$152K |
|
5014
CALL
IDEAYA Biosciences
IDYA
$3.5B
| $107K | ﹤0.01% |
4,000
+1,800
| +82% | +$45.6K |
|
|
NSA
5015
PUT
DELISTED
National Storage Affiliates Trust
NSA
| $107K | ﹤0.01% |
3,400
+2,700
| +386% | +$91.4K |
|
5016
PUT
Par Pacific Holdings
PARR
$4.31B
| $107K | ﹤0.01% |
3,000
-400
| -12% | -$13.1K |
|
5017
CALL
Planet Labs
PL
$7.21B
| $107K | ﹤0.01% |
41,500
-38,500
| -48% | -$122K |
|
5018
CALL
Protalix BioTherapeutics
PLX
$183M
| $107K | ﹤0.01% |
65,000
+44,600
| +219% | +$80.1K |
|
5019
PUT
PSQ Holdings
PSQH
$13.9M
| $107K | ﹤0.01% |
+787
| New | +$140K |
|
5020
Sportsman's Warehouse
SPWH
$45.3M
| $107K | ﹤0.01% |
23,909
+17,698
| +285% | +$91.5K |
|
5021
CALL
Weis Markets
WMK
$1.92B
| $107K | ﹤0.01% |
+1,700
| New | +$111K |
|
|
YELL
5022
PUT
DELISTED
Yellow Corporation Common Stock
YELL
| $107K | ﹤0.01% |
75,900
+69,600
| +1,105% | +$109K |
|
5023
PUT
Brookfield Asset Management
BAM
$76.6B
| $106K | ﹤0.01% |
3,200
-13,100
| -80% | -$442K |
|
5024
PUT
Banco Macro
BMA
$6.02B
| $106K | ﹤0.01% |
5,400
+1,200
| +29% | +$29.2K |
|
5025
CALL
Healthpeak Properties
DOC
$15.2B
| $106K | ﹤0.01% |
5,800
-200
| -3% | -$4.11K |
|
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.