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 | |
|---|---|---|---|---|---|---|
2951
Lumentum
LITE
$55.4B
| $1.17M | ﹤0.01% |
24,669
+10,591
| +75% | +$538K |
|
2952
Direxion Daily NVDA Bull 2X ETF
NVDU
$530M
| $1.17M | ﹤0.01% |
17,748
+17,705
| +41,174% | +$867K |
|
2953
CALL
Iridium Communications
IRDM
$4.87B
| $1.17M | ﹤0.01% |
44,600
+12,300
| +38% | +$400K |
|
2954
PUT
Structure Therapeutics
GPCR
$3.46B
| $1.17M | ﹤0.01% |
27,200
-7,300
| -21% | -$308K |
|
2955
CALL
Ryder
R
$10.3B
| $1.17M | ﹤0.01% |
9,700
-30,000
| -76% | -$3.42M |
|
2956
JFrog
FROG
$9.84B
| $1.16M | ﹤0.01% |
26,289
-3,808
| -13% | -$147K |
|
2957
CALL
ACV Auctions
ACVA
$1.4B
| $1.16M | ﹤0.01% |
61,900
+44,400
| +254% | +$695K |
|
2958
CALL
Herc Holdings
HRI
$5.34B
| $1.16M | ﹤0.01% |
6,900
-3,400
| -33% | -$518K |
|
|
SWTX
2959
DELISTED
SpringWorks Therapeutics
SWTX
| $1.16M | ﹤0.01% |
23,591
+20,330
| +623% | +$940K |
|
2960
CALL
Lear
LEA
$7.26B
| $1.16M | ﹤0.01% |
8,000
-900
| -10% | -$123K |
|
2961
Sempra
SRE
$59.7B
| $1.16M | ﹤0.01% |
16,135
+11,878
| +279% | +$851K |
|
2962
CALL
BioCryst Pharmaceuticals
BCRX
$2.43B
| $1.16M | ﹤0.01% |
227,900
+131,200
| +136% | +$738K |
|
2963
CALL
WEC Energy
WEC
$37.1B
| $1.16M | ﹤0.01% |
14,100
+9,500
| +207% | +$764K |
|
|
ETNB
2964
CALL
DELISTED
89bio
ETNB
| $1.16M | ﹤0.01% |
99,300
+5,200
| +6% | +$57.6K |
|
2965
PUT
Ares Capital
ARCC
$13.6B
| $1.15M | ﹤0.01% |
55,400
-3,100
| -5% | -$62.8K |
|
2966
CALL
Full Truck Alliance
YMM
$9.66B
| $1.15M | ﹤0.01% |
158,600
+38,900
| +32% | +$260K |
|
2967
ODDITY Tech
ODD
$758M
| $1.15M | ﹤0.01% |
26,523
+25,819
| +3,667% | +$1.11M |
|
2968
PUT
Choice Hotels
CHH
$5.15B
| $1.15M | ﹤0.01% |
9,100
+2,200
| +32% | +$263K |
|
|
2969
WEC Energy
WEC
$37.1B
| $1.15M | ﹤0.01% |
13,969
-22,548
| -62% | -$1.81M |
|
|
PPLI
2970
CALL
People Inc
PPLI
$3.15B
| $1.15M | ﹤0.01% |
26,209
-20,844
| -44% | -$900K |
|
2971
CALL
Cabaletta Bio
CABA
$444M
| $1.14M | ﹤0.01% |
67,100
+40,900
| +156% | +$878K |
|
2972
PUT
Shoals Technologies Group
SHLS
$1.57B
| $1.14M | ﹤0.01% |
102,400
-15,300
| -13% | -$210K |
|
2973
CALL
Natera
NTRA
$37B
| $1.14M | ﹤0.01% |
12,500
-40,800
| -77% | -$3.07M |
|
2974
CALL
Evergy
EVRG
$19.8B
| $1.14M | ﹤0.01% |
21,400
+17,100
| +398% | +$874K |
|
2975
AT&T
T
$167B
| $1.14M | ﹤0.01% |
64,856
-702,376
| -92% | -$12M |
|
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.