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 |
Pfizer
PFE
|
+$89.5M |
| 2 |
State Street Energy Select Sector SPDR ETF
XLE
|
+$85.5M |
| 3 |
Boeing
BA
|
+$71M |
| 4 |
Intel
INTC
|
+$60.7M |
| 5 |
Meta Platforms (Facebook)
META
|
+$48.3M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
NVIDIA
NVDA
|
+$117M |
| 2 |
Alphabet (Google) Class A
GOOGL
|
+$104M |
| 3 |
Alibaba
BABA
|
+$82.8M |
| 4 |
Walt Disney
DIS
|
+$68.5M |
| 5 |
Citigroup
C
|
+$59.8M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Technology | 0.38% |
| 2 | Healthcare | 0.27% |
| 3 | Consumer Discretionary | 0.25% |
| 4 | Industrials | 0.17% |
| 5 | Communication Services | 0.16% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
|
PRO
4201
CALL
DELISTED
PROS Holdings
PRO
| $356K | ﹤0.01% |
9,800
+9,500
| +3,167% | +$336K |
|
4202
PUT
SkyWater Technology
SKYT
$1.5B
| $356K | ﹤0.01% |
35,100
+3,400
| +11% | +$33.5K |
|
4203
CALL
Spire Global
SPIR
$408M
| $356K | ﹤0.01% |
29,700
-44,900
| -60% | -$446K |
|
|
STR
4204
CALL
DELISTED
Sitio Royalties
STR
| $355K | ﹤0.01% |
14,400
+7,900
| +122% | +$178K |
|
4205
CALL
Cimpress
CMPR
$2.37B
| $354K | ﹤0.01% |
4,000
+2,200
| +122% | +$187K |
|
4206
CALL
Disc Medicine
IRON
$2.81B
| $354K | ﹤0.01% |
5,700
+4,600
| +418% | +$298K |
|
4207
Modine Manufacturing
MOD
$9.46B
| $354K | ﹤0.01% |
+3,722
| New | +$288K |
|
|
NVNO
4208
CALL
enVVeno Medical
NVNO
$6.94M
| $354K | ﹤0.01% |
1,863
+1,280
| +220% | +$230K |
|
4209
PUT
Replimune Group
REPL
$454M
| $354K | ﹤0.01% |
43,400
-1,100
| -2% | -$9.02K |
|
4210
PUT
SurgePays
SURG
$5.9M
| $354K | ﹤0.01% |
92,200
+88,900
| +2,694% | +$593K |
|
|
TE
4211
CALL
T1 Energy
TE
$1.04B
| $354K | ﹤0.01% |
210,900
-21,600
| -9% | -$34.2K |
|
4212
CALL
Host Hotels & Resorts
HST
$17.5B
| $353K | ﹤0.01% |
17,100
+6,800
| +66% | +$137K |
|
4213
CALL
Aviat Networks
AVNW
$253M
| $352K | ﹤0.01% |
9,200
-22,400
| -71% | -$751K |
|
4214
CALL
Popular Inc
BPOP
$11B
| $352K | ﹤0.01% |
4,000
-12,300
| -75% | -$1.03M |
|
|
4215
PUT
Popular Inc
BPOP
$11B
| $352K | ﹤0.01% |
4,000
-2,000
| -33% | -$168K |
|
4216
CALL
Loews
L
$24.5B
| $352K | ﹤0.01% |
4,500
+3,300
| +275% | +$244K |
|
4217
PUT
Magnite
MGNI
$2.83B
| $352K | ﹤0.01% |
32,800
-11,200
| -25% | -$112K |
|
4218
CALL
Murphy Oil
MUR
$5.55B
| $351K | ﹤0.01% |
7,700
-9,300
| -55% | -$375K |
|
4219
PUT
ADT
ADT
$5.43B
| $350K | ﹤0.01% |
52,100
+42,100
| +421% | +$280K |
|
4220
CALL
Aldeyra Therapeutics
ALDX
$97.1M
| $350K | ﹤0.01% |
107,200
+104,300
| +3,597% | +$343K |
|
4221
CALL
Bankunited
BKU
$3.33B
| $350K | ﹤0.01% |
12,500
+12,400
| +12,400% | +$347K |
|
4222
iShares US Technology ETF
IYW
$22.6B
| $350K | ﹤0.01% |
2,593
+348
| +16% | +$45.3K |
|
4223
PUT
Manhattan Associates
MANH
$12.1B
| $350K | ﹤0.01% |
1,400
-4,500
| -76% | -$1.07M |
|
4224
CALL
Kymera Therapeutics
KYMR
$8.66B
| $349K | ﹤0.01% |
8,700
-2,200
| -20% | -$78.7K |
|
4225
McEwen Inc
MUX
$1B
| $349K | ﹤0.01% |
35,466
-110,137
| -76% | -$796K |
|
Similar funds
Simplex Trading's Q1 2024 Portfolio in Review
As of Q1 2024, Simplex Trading held 10,366 positions worth $173B, up 11% from $156B the previous quarter. Its ten largest holdings account for 47% of the portfolio.
Simplex Trading's Q1 2024 filing shows 1,549 new, 3,675 increased, 3,484 reduced and 1,506 closed positions. Its largest new stake was Boeing: 345,653 shares worth $66.7M. The largest sale was NVIDIA, an estimated $117M.
By sector, the portfolio is most concentrated in Technology at 0.38% of assets, up from 0.33% a quarter earlier, followed by Healthcare and Consumer Discretionary.
- Simplex Trading's largest Q1 2024 buy was Boeing: 345,653 shares worth $66.7M.
- Simplex Trading added most to Pfizer in Q1 2024, an estimated $89.5M increase.
- Simplex Trading's biggest Q1 2024 reduction was NVIDIA, cutting an estimated $117M.
- Simplex Trading fully exited Citigroup in Q1 2024, selling an estimated $59.8M.
- Simplex Trading's ten largest holdings make up 47% of its $173B portfolio in Q1 2024.
- Simplex Trading opened 1,549 new positions and closed 1,506 in Q1 2024.
- Simplex Trading's portfolio value rose 11% quarter-over-quarter to $173B.
Based on Simplex Trading's 13F filing for Q1 2024, filed 25 Apr 2024.