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 | |
|---|---|---|---|---|---|---|
|
CAMP
6151
PUT
DELISTED
CalAmp Corp.
CAMP
| $41K | ﹤0.01% |
+500
| New | +$48.8K |
|
|
YELL
6152
CALL
DELISTED
Yellow Corporation Common Stock
YELL
| $41K | ﹤0.01% |
20,200
-2,400
| -11% | -$6.4K |
|
6153
PUT
Argan
AGX
$8B
| $40K | ﹤0.01% |
1,000
-200
| -17% | -$7.85K |
|
6154
KE Holdings
BEKE
$18.7B
| $40K | ﹤0.01% |
2,169
-342,590
| -99% | -$6.34M |
|
6155
Cathay General Bancorp
CATY
$4.22B
| $40K | ﹤0.01% |
+1,181
| New | +$48.5K |
|
|
DENN
6156
PUT
DELISTED
Denny's
DENN
| $40K | ﹤0.01% |
3,600
+700
| +24% | +$8.14K |
|
6157
Dycom Industries
DY
$12B
| $40K | ﹤0.01% |
+429
| New | +$39.9K |
|
6158
PUT
Ecopetrol
EC
$34.5B
| $40K | ﹤0.01% |
18,400
-27,200
| -60% | -$295K |
|
6159
CALL
Fulcrum Therapeutics
FULC
$273M
| $40K | ﹤0.01% |
14,300
+2,600
| +22% | +$23.3K |
|
6160
Korro Bio
KRRO
$150M
| $40K | ﹤0.01% |
1,629
+1,473
| +944% | +$168K |
|
6161
CALL
MillerKnoll
MLKN
$1.53B
| $40K | ﹤0.01% |
2,000
+1,900
| +1,900% | +$42.7K |
|
6162
PUT
Everspin Technologies
MRAM
$341M
| $40K | ﹤0.01% |
5,900
+3,700
| +168% | +$24.6K |
|
6163
CALL
NewtekOne
NEWT
$428M
| $40K | ﹤0.01% |
3,200
-5,100
| -61% | -$84.1K |
|
6164
PUT
National Fuel Gas
NFG
$7.82B
| $40K | ﹤0.01% |
700
-300
| -30% | -$17.4K |
|
6165
PUT
NerdWallet
NRDS
$592M
| $40K | ﹤0.01% |
2,500
-4,100
| -62% | -$61.8K |
|
6166
CALL
Bank of N.T. Butterfield & Son
NTB
$2.43B
| $40K | ﹤0.01% |
+1,500
| New | +$47.9K |
|
6167
CALL
NWPX Infrastructure Inc
NWPX
$1.19B
| $40K | ﹤0.01% |
+1,300
| New | +$46.9K |
|
|
ONL
6168
PUT
Orion Office REIT
ONL
$150M
| $40K | ﹤0.01% |
6,100
+4,700
| +336% | +$38.2K |
|
6169
CALL
Perma-Fix Environmental Services
PESI
$352M
| $40K | ﹤0.01% |
+3,400
| New | +$22.1K |
|
6170
CALL
Perdoceo Education
PRDO
$1.99B
| $40K | ﹤0.01% |
3,000
-4,800
| -62% | -$67.2K |
|
6171
PUT
Robert Half
RHI
$3.87B
| $40K | ﹤0.01% |
500
-300
| -38% | -$23.8K |
|
6172
Rimini Street
RMNI
$449M
| $40K | ﹤0.01% |
9,720
-5,431
| -36% | -$24.5K |
|
6173
CALL
Summit Therapeutics
SMMT
$10.4B
| $40K | ﹤0.01% |
23,100
-24,900
| -52% | -$67.9K |
|
|
NSLR
6174
PUT
Neostellar Capital Corp
NSLR
$269M
| $40K | ﹤0.01% |
11,100
+8,200
| +283% | +$31.5K |
|
6175
Direxion Daily 7-10 Year Treasury Bull 3X ETF
TYD
$31.6M
| $40K | ﹤0.01% |
1,270
-2,548
| -67% | -$79.5K |
|
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.