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 | |
|---|---|---|---|---|---|---|
1201
PUT
CVR Partners
UAN
$1.31B
| $5.83M | 0.01% |
65,400
+64,100
| +4,931% | +$6.24M |
|
1202
CALL
Tractor Supply
TSCO
$15.9B
| $5.83M | 0.01% |
124,000
-27,500
| -18% | -$1.25M |
|
1203
CALL
Travelers Companies
TRV
$78.5B
| $5.83M | 0.01% |
34,000
+11,600
| +52% | +$2.11M |
|
1204
PUT
eBay
EBAY
$48.5B
| $5.82M | 0.01% |
131,200
-34,100
| -21% | -$1.56M |
|
1205
CALL
Mobileye
MBLY
$6.29B
| $5.81M | 0.01% |
134,200
+109,400
| +441% | +$4.28M |
|
1206
PUT
Monolithic Power Systems
MPWR
$68.6B
| $5.81M | 0.01% |
11,600
+5,600
| +93% | +$2.57M |
|
1207
PUT
Duolingo
DUOL
$5.62B
| $5.8M | 0.01% |
40,700
-11,600
| -22% | -$1.19M |
|
1208
PUT
Interactive Brokers
IBKR
$40.9B
| $5.79M | 0.01% |
280,800
-54,000
| -16% | -$1.1M |
|
1209
PUT
Lincoln National
LNC
$7.81B
| $5.78M | 0.01% |
257,400
+195,100
| +313% | +$5.8M |
|
1210
PUT
RB Global
RBA
$20.3B
| $5.78M | 0.01% |
102,600
+75,400
| +277% | +$4.45M |
|
1211
CALL
Clarivate
CLVT
$1.24B
| $5.77M | 0.01% |
614,600
+442,600
| +257% | +$4.56M |
|
1212
PUT
TripAdvisor
TRIP
$1.57B
| $5.77M | 0.01% |
290,400
+113,900
| +65% | +$2.43M |
|
1213
PUT
Enterprise Products Partners
EPD
$83.9B
| $5.76M | 0.01% |
222,500
-41,800
| -16% | -$1.07M |
|
1214
PUT
Monster Beverage
MNST
$91.5B
| $5.75M | 0.01% |
106,500
+54,700
| +106% | +$2.81M |
|
1215
PUT
Tapestry
TPR
$28.1B
| $5.75M | 0.01% |
133,400
+107,200
| +409% | +$4.6M |
|
1216
PUT
Keysight
KEYS
$55.6B
| $5.75M | 0.01% |
35,600
+33,700
| +1,774% | +$5.72M |
|
1217
PUT
Parker-Hannifin
PH
$124B
| $5.75M | 0.01% |
17,100
+13,300
| +350% | +$4.4M |
|
1218
CALL
CBRE Group
CBRE
$39.7B
| $5.71M | 0.01% |
78,500
+43,400
| +124% | +$3.55M |
|
1219
PUT
RingCentral
RNG
$3.24B
| $5.7M | 0.01% |
185,900
+134,000
| +258% | +$4.79M |
|
1220
PUT
Invesco CurrencyShares Euro Currency Trust
FXE
$331M
| $5.69M | 0.01% |
56,800
-104,100
| -65% | -$10.3M |
|
1221
CALL
PennyMac Financial
PFSI
$4.29B
| $5.68M | 0.01% |
95,300
-36,700
| -28% | -$2.27M |
|
1222
CALL
Builders FirstSource
BLDR
$7.59B
| $5.67M | 0.01% |
63,900
+16,500
| +35% | +$1.31M |
|
|
BBBY
1223
CALL
Bed Bath & Beyond
BBBY
$471M
| $5.67M | 0.01% |
307,890
+206,360
| +203% | +$3.85M |
|
1224
CALL
Reliance Steel & Aluminium
RS
$20.2B
| $5.67M | 0.01% |
22,100
+5,800
| +36% | +$1.37M |
|
1225
CALL
Azenta
AZTA
$1.3B
| $5.67M | 0.01% |
127,100
+112,600
| +777% | +$5.58M |
|
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.