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 |
Walmart Inc
WMT
|
+$43.6M |
| 2 |
Apple
AAPL
|
+$40.9M |
| 3 |
VanEck Oil Services ETF
OIH
|
+$37.7M |
| 4 |
Citigroup
C
|
+$34.2M |
| 5 |
iShares 20+ Year Treasury Bond ETF
TLT
|
+$32.7M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
Amazon
AMZN
|
+$189M |
| 2 |
Invesco QQQ Trust
QQQ
|
+$123M |
| 3 |
NVIDIA
NVDA
|
+$115M |
| 4 |
Tesla
TSLA
|
+$52M |
| 5 |
Meta Platforms (Facebook)
META
|
+$49M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Technology | 0.42% |
| 2 | Consumer Discretionary | 0.2% |
| 3 | Healthcare | 0.17% |
| 4 | Industrials | 0.15% |
| 5 | Communication Services | 0.13% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
|
AMRS
3226
CALL
DELISTED
Amyris Inc.
AMRS
| $520K | ﹤0.01% |
382,800
-405,600
| -51% | -$579K |
|
3227
GXO Logistics
GXO
$6.13B
| $519K | ﹤0.01% |
10,305
+1,178
| +13% | +$58.6K |
|
3228
CALL
GDS Holdings
GDS
$6.29B
| $518K | ﹤0.01% |
27,800
-56,200
| -67% | -$1.19M |
|
3229
CALL
Pitney Bowes
PBI
$2.46B
| $518K | ﹤0.01% |
133,400
+97,300
| +270% | +$409K |
|
3230
PUT
Targa Resources
TRGP
$57.4B
| $517K | ﹤0.01% |
7,100
-2,300
| -24% | -$170K |
|
3231
CALL
BWX Technologies
BWXT
$16.2B
| $516K | ﹤0.01% |
8,200
+6,700
| +447% | +$404K |
|
3232
First Horizon
FHN
$12.1B
| $516K | ﹤0.01% |
29,074
+14,938
| +106% | +$332K |
|
|
FRG
3233
DELISTED
Franchise Group, Inc.
FRG
| $516K | ﹤0.01% |
+18,960
| New | +$545K |
|
3234
CALL
Coca-Cola Femsa
KOF
$22.9B
| $515K | ﹤0.01% |
6,400
| – | – |
|
3235
BGC Group
BGC
$5.65B
| $513K | ﹤0.01% |
98,139
+20,556
| +26% | +$94.2K |
|
3236
CALL
LGI Homes
LGIH
$1.4B
| $513K | ﹤0.01% |
4,500
+3,900
| +650% | +$423K |
|
|
VRNT
3237
PUT
DELISTED
Verint Systems
VRNT
| $513K | ﹤0.01% |
13,800
+3,500
| +34% | +$131K |
|
|
ENZ
3238
PUT
DELISTED
Enzo Biochem, Inc.
ENZ
| $512K | ﹤0.01% |
210,900
+116,600
| +124% | +$173K |
|
3239
CALL
Evolv Technologies
EVLV
$980M
| $511K | ﹤0.01% |
163,800
+70,300
| +75% | +$201K |
|
3240
CALL
Grocery Outlet
GO
$932M
| $511K | ﹤0.01% |
18,100
+7,000
| +63% | +$201K |
|
|
BECN
3241
CALL
DELISTED
Beacon Roofing Supply, Inc.
BECN
| $511K | ﹤0.01% |
8,700
+8,400
| +2,800% | +$492K |
|
3242
CALL
Park Hotels & Resorts
PK
$3.03B
| $510K | ﹤0.01% |
41,300
-48,300
| -54% | -$634K |
|
3243
PUT
Zymeworks
ZYME
$1.69B
| $510K | ﹤0.01% |
56,500
+38,800
| +219% | +$338K |
|
|
VRN
3244
DELISTED
Veren
VRN
| $509K | ﹤0.01% |
72,133
-1,950
| -3% | -$13.5K |
|
3245
CALL
Build-A-Bear
BBW
$428M
| $508K | ﹤0.01% |
21,900
-156,400
| -88% | -$3.63M |
|
|
MTLS
3246
PUT
Materialise
MTLS
$373M
| $508K | ﹤0.01% |
61,300
-6,700
| -10% | -$60.2K |
|
3247
PUT
Check Point Software Technologies
CHKP
$13.6B
| $507K | ﹤0.01% |
3,900
-35,300
| -90% | -$4.49M |
|
3248
CALL
Dine Brands
DIN
$448M
| $507K | ﹤0.01% |
7,500
+7,100
| +1,775% | +$521K |
|
3249
CALL
Robert Half
RHI
$4.07B
| $507K | ﹤0.01% |
6,300
+5,200
| +473% | +$413K |
|
3250
CALL
Zevra Therapeutics
ZVRA
$574M
| $507K | ﹤0.01% |
92,300
+26,000
| +39% | +$138K |
|
Similar funds
Simplex Trading's Q1 2023 Portfolio in Review
As of Q1 2023, Simplex Trading held 10,803 positions worth $114B, up 24% from $91.9B the previous quarter. Its ten largest holdings account for 38% of the portfolio.
Simplex Trading deployed $10.1B of net new capital in Q1 2023, opening 1,536 new positions and adding to 3,665 existing holdings. Its largest new stake was Walmart Inc: 918,957 shares worth $45.2M.
By sector, the portfolio is most concentrated in Technology at 0.42% of assets, up from 0.35% a quarter earlier, followed by Consumer Discretionary and Healthcare.
On the sell side, the largest reduction was Meta Platforms (Facebook), an estimated $49M trimmed.
- Simplex Trading's largest Q1 2023 buy was Walmart Inc: 918,957 shares worth $45.2M.
- Simplex Trading added most to Apple in Q1 2023, an estimated $40.9M increase.
- Simplex Trading's biggest Q1 2023 reduction was Meta Platforms (Facebook), cutting an estimated $49M.
- Simplex Trading fully exited Amazon in Q1 2023, selling an estimated $189M.
- Simplex Trading's ten largest holdings make up 38% of its $114B portfolio in Q1 2023.
- Simplex Trading opened 1,536 new positions and closed 1,729 in Q1 2023.
- Simplex Trading's portfolio value rose 24% quarter-over-quarter to $114B.
Based on Simplex Trading's 13F filing for Q1 2023, filed 27 Apr 2023.