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 | |
|---|---|---|---|---|---|---|
3651
CALL
Target Hospitality
TH
$1.47B
| $607K | ﹤0.01% |
55,900
-52,000
| -48% | -$488K |
|
|
GLDD
3652
CALL
DELISTED
Great Lakes Dredge & Dock
GLDD
| $606K | ﹤0.01% |
69,300
+29,200
| +73% | +$240K |
|
3653
PUT
uniQure
QURE
$2.52B
| $606K | ﹤0.01% |
116,600
+86,300
| +285% | +$495K |
|
3654
CALL
Graphic Packaging
GPK
$3.45B
| $604K | ﹤0.01% |
20,700
+10,700
| +107% | +$280K |
|
3655
PUT
Nordic American Tanker
NAT
$1.35B
| $604K | ﹤0.01% |
154,200
-195,600
| -56% | -$821K |
|
|
STKL
3656
PUT
DELISTED
SunOpta
STKL
| $604K | ﹤0.01% |
88,000
+87,400
| +14,567% | +$540K |
|
|
DOOR
3657
CALL
DELISTED
MASONITE INTERNATIONAL CORP
DOOR
| $604K | ﹤0.01% |
4,600
-85,100
| -95% | -$9.59M |
|
3658
indie Semiconductor
INDI
$678M
| $603K | ﹤0.01% |
+85,201
| New | +$577K |
|
3659
CALL
Rithm Capital
RITM
$5.46B
| $603K | ﹤0.01% |
54,100
-21,500
| -28% | -$231K |
|
|
VRN
3660
CALL
DELISTED
Veren
VRN
| $601K | ﹤0.01% |
73,500
-300
| -0.4% | -$2.1K |
|
3661
Arrowhead Research
ARWR
$12.1B
| $600K | ﹤0.01% |
21,011
+1,867
| +10% | +$59.7K |
|
3662
CALL
Supernus Pharmaceuticals
SUPN
$2.77B
| $600K | ﹤0.01% |
17,600
+16,400
| +1,367% | +$488K |
|
3663
CALL
SFL Corp
SFL
$1.61B
| $599K | ﹤0.01% |
45,500
+37,900
| +499% | +$477K |
|
|
UNIT
3664
PUT
Uniti Group
UNIT
$2.53B
| $599K | ﹤0.01% |
101,600
-22,200
| -18% | -$127K |
|
|
ETRN
3665
CALL
DELISTED
Equitrans Midstream Corporation Common Stock
ETRN
| $599K | ﹤0.01% |
48,000
-529,000
| -92% | -$5.68M |
|
3666
BellRing Brands
BRBR
$1.59B
| $598K | ﹤0.01% |
10,133
-18,894
| -65% | -$1.08M |
|
3667
CALL
Duluth Holdings
DLTH
$163M
| $598K | ﹤0.01% |
+122,100
| New | +$596K |
|
3668
Bank of Montreal
BMO
$127B
| $597K | ﹤0.01% |
+6,122
| New | +$578K |
|
3669
PUT
Denali Therapeutics
DNLI
$3.82B
| $597K | ﹤0.01% |
29,100
+29,000
| +29,000% | +$545K |
|
3670
PUT
LegalZoom.com
LZ
$1.39B
| $597K | ﹤0.01% |
44,800
-2,100
| -4% | -$24.2K |
|
3671
PUT
Remitly
RELY
$4.91B
| $597K | ﹤0.01% |
+28,800
| New | +$547K |
|
3672
PUT
Biomea Fusion
BMEA
$90.4M
| $596K | ﹤0.01% |
39,900
-12,200
| -23% | -$201K |
|
3673
CALL
LiveRamp
RAMP
$2.29B
| $596K | ﹤0.01% |
17,300
+14,800
| +592% | +$544K |
|
|
SRG
3674
PUT
Seritage Growth Properties
SRG
$129M
| $596K | ﹤0.01% |
61,800
+50,400
| +442% | +$473K |
|
3675
PUT
Principal Financial Group
PFG
$24.6B
| $595K | ﹤0.01% |
6,900
-3,400
| -33% | -$273K |
|
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.