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 | |
|---|---|---|---|---|---|---|
|
GRTS
3826
PUT
DELISTED
Gritstone bio, Inc. Common Stock
GRTS
| $520K | ﹤0.01% |
202,400
+199,300
| +6,429% | +$487K |
|
|
ERF
3827
PUT
DELISTED
Enerplus Corporation
ERF
| $520K | ﹤0.01% |
26,500
-800
| -3% | -$13K |
|
3828
CALL
Vaxcyte
PCVX
$7.66B
| $519K | ﹤0.01% |
7,600
+2,900
| +62% | +$201K |
|
3829
Invesco DB Agriculture Fund
DBA
$1.23B
| $518K | ﹤0.01% |
+20,945
| New | +$463K |
|
|
FLNA
3830
PUT
Filana Therapeutics
FLNA
$42.1M
| $518K | ﹤0.01% |
67,300
-67,800
| -50% | -$1.56M |
|
3831
CALL
Gentherm
THRM
$1.3B
| $518K | ﹤0.01% |
9,000
-1,400
| -13% | -$72.9K |
|
3832
CALL
Vir Biotechnology
VIR
$1.45B
| $518K | ﹤0.01% |
51,200
+23,200
| +83% | +$236K |
|
3833
Appian
APPN
$2.11B
| $517K | ﹤0.01% |
12,961
+4,636
| +56% | +$161K |
|
3834
CALL
Perella Weinberg Partners
PWP
$1.11B
| $517K | ﹤0.01% |
36,600
+16,900
| +86% | +$212K |
|
|
DFTX
3835
Definium Therapeutics
DFTX
$5.61B
| $515K | ﹤0.01% |
54,848
+45,871
| +511% | +$262K |
|
3836
PUT
Middleby
MIDD
$5.96B
| $514K | ﹤0.01% |
3,200
+700
| +28% | +$103K |
|
3837
CALL
Paysafe
PSFE
$455M
| $514K | ﹤0.01% |
32,600
-131,400
| -80% | -$1.84M |
|
3838
Getty Images
GETY
$158M
| $513K | ﹤0.01% |
123,839
+79,469
| +179% | +$368K |
|
3839
CALL
Artisan Partners
APAM
$2.91B
| $512K | ﹤0.01% |
11,200
-1,200
| -10% | -$51.5K |
|
3840
CALL
Qfin Holdings
QFIN
$1.68B
| $512K | ﹤0.01% |
27,800
+10,900
| +64% | +$171K |
|
3841
Olin
OLN
$2.46B
| $511K | ﹤0.01% |
8,697
-65,322
| -88% | -$3.5M |
|
3842
CALL
Rhythm Pharmaceuticals
RYTM
$7.38B
| $511K | ﹤0.01% |
11,800
-3,200
| -21% | -$140K |
|
3843
CALL
National Fuel Gas
NFG
$7.76B
| $510K | ﹤0.01% |
9,500
+7,200
| +313% | +$356K |
|
3844
CALL
Sabre
SABR
$727M
| $510K | ﹤0.01% |
210,900
-240,900
| -53% | -$809K |
|
3845
CALL
Taboola.com
TBLA
$1.4B
| $510K | ﹤0.01% |
114,900
+71,500
| +165% | +$319K |
|
3846
PUT
Arch Capital
ACGL
$36.8B
| $508K | ﹤0.01% |
5,500
+4,800
| +686% | +$406K |
|
3847
CALL
Antero Midstream
AM
$10.3B
| $508K | ﹤0.01% |
36,200
+1,300
| +4% | +$16.6K |
|
3848
CALL
Arlo Technologies
ARLO
$1.55B
| $508K | ﹤0.01% |
40,200
-18,500
| -32% | -$185K |
|
3849
Lemonade
LMND
$3.73B
| $508K | ﹤0.01% |
30,970
-39,362
| -56% | -$662K |
|
3850
Kura Oncology
KURA
$789M
| $506K | ﹤0.01% |
23,746
+16,201
| +215% | +$315K |
|
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.