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 | |
|---|---|---|---|---|---|---|
5476
Vanguard Short-Term Treasury ETF
VGSH
$29.3B
| $111K | ﹤0.01% |
1,916
-2,602
| -58% | -$151K |
|
|
B
5477
CALL
DELISTED
Barnes Group Inc.
B
| $111K | ﹤0.01% |
+3,000
| New | +$103K |
|
5478
PUT
Cooper-Standard Automotive
CPS
$523M
| $110K | ﹤0.01% |
6,700
-5,000
| -43% | -$80.3K |
|
5479
Jasper Therapeutics
JSPR
$21M
| $110K | ﹤0.01% |
3,758
+3,755
| +125,167% | +$66.7K |
|
5480
PUT
Dr. Reddy's Laboratories
RDY
$9.87B
| $110K | ﹤0.01% |
+7,500
| New | +$110K |
|
|
SPYM
5481
State Street SPDR Portfolio S&P 500 ETF
SPYM
$161B
| $110K | ﹤0.01% |
1,793
-4,283
| -70% | -$251K |
|
5482
PUT
TriplePoint Venture Growth BDC
TPVG
$184M
| $110K | ﹤0.01% |
11,700
+10,200
| +680% | +$108K |
|
|
XOMA
5483
CALL
DELISTED
Xoma
XOMA
| $110K | ﹤0.01% |
4,600
+3,300
| +254% | +$74K |
|
|
NAGE
5484
CALL
Niagen Bioscience
NAGE
$271M
| $110K | ﹤0.01% |
+31,700
| New | +$58.7K |
|
5485
Idexx Laboratories
IDXX
$44.1B
| $109K | ﹤0.01% |
+202
| New | +$110K |
|
5486
CALL
POSCO
PKX
$16.1B
| $109K | ﹤0.01% |
1,400
-600
| -30% | -$49.4K |
|
5487
CALL
State Street Multi-Asset Real Return ETF
RLY
$1.26B
| $109K | ﹤0.01% |
2,600
+1,500
| +136% | +$40.1K |
|
5488
PUT
Adaptive Biotechnologies
ADPT
$3.59B
| $108K | ﹤0.01% |
33,900
+33,400
| +6,680% | +$129K |
|
5489
Arthur J. Gallagher & Co
AJG
$64.1B
| $108K | ﹤0.01% |
435
-8,046
| -95% | -$1.93M |
|
5490
CALL
Atlas Lithium Corp
ATLX
$80.8M
| $108K | ﹤0.01% |
6,400
+3,100
| +94% | +$61.8K |
|
|
CVGW
5491
PUT
DELISTED
Calavo Growers
CVGW
| $108K | ﹤0.01% |
3,900
-1,200
| -24% | -$33.7K |
|
5492
PUT
HUB Group
HUBG
$2.85B
| $108K | ﹤0.01% |
2,500
+500
| +25% | +$21.9K |
|
5493
Ingredion
INGR
$6.27B
| $108K | ﹤0.01% |
+930
| New | +$105K |
|
|
RPC
5494
PUT
Ridgepost Capital
RPC
$949M
| $108K | ﹤0.01% |
12,900
-10,900
| -46% | -$95.5K |
|
5495
CALL
Savara
SVRA
$1.12B
| $108K | ﹤0.01% |
21,800
+21,300
| +4,260% | +$103K |
|
5496
Tiptree Inc
TIPT
$662M
| $108K | ﹤0.01% |
6,264
-30,115
| -83% | -$540K |
|
5497
Voyager Therapeutics
VYGR
$183M
| $108K | ﹤0.01% |
+11,611
| New | +$98K |
|
|
DOG
5498
ProShares Short Dow30
DOG
$110M
| $107K | ﹤0.01% |
+3,797
| New | +$111K |
|
|
JFIN
5499
PUT
Jiayin Group
JFIN
$113M
| $107K | ﹤0.01% |
16,500
+2,000
| +14% | +$11.9K |
|
5500
CALL
LivePerson
LPSN
$21.8M
| $107K | ﹤0.01% |
7,213
+6,000
| +495% | +$206K |
|
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.