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 | |
|---|---|---|---|---|---|---|
|
BCYC
4626
Bicycle Therapeutics
BCYC
$269M
| $244K | ﹤0.01% |
+9,830
| New | +$209K |
|
4627
PUT
GoodRx Holdings
GDRX
$1.09B
| $244K | ﹤0.01% |
34,400
+5,100
| +17% | +$33.7K |
|
4628
CALL
Prudential
PUK
$36.4B
| $244K | ﹤0.01% |
12,700
| – | – |
|
4629
PUT
AtriCure
ATRC
$2.08B
| $243K | ﹤0.01% |
8,000
+7,900
| +7,900% | +$265K |
|
4630
PUT
1-800-Flowers.com
FLWS
$252M
| $243K | ﹤0.01% |
22,500
-3,500
| -13% | -$35.9K |
|
4631
CALL
CGI
GIB
$15.4B
| $243K | ﹤0.01% |
2,200
+1,400
| +175% | +$157K |
|
4632
CALL
Inogen
INGN
$174M
| $243K | ﹤0.01% |
30,200
+29,700
| +5,940% | +$210K |
|
4633
Lightwave Logic
LWLG
$823M
| $243K | ﹤0.01% |
52,031
+5,973
| +13% | +$26K |
|
4634
Malibu Boats
MBUU
$548M
| $243K | ﹤0.01% |
+5,631
| New | +$258K |
|
4635
PUT
Oceaneering
OII
$4.64B
| $243K | ﹤0.01% |
10,400
+8,900
| +593% | +$187K |
|
4636
ProShares UltraPro Short 20+ Year Treasury
TTT
$19M
| $243K | ﹤0.01% |
3,510
+218
| +7% | +$15.2K |
|
4637
AbCellera Biologics
ABCL
$1.65B
| $242K | ﹤0.01% |
53,474
-3,386
| -6% | -$17.3K |
|
4638
Allot
ALLT
$362M
| $242K | ﹤0.01% |
107,867
+52,286
| +94% | +$99.5K |
|
4639
PUT
AST SpaceMobile
ASTS
$15.8B
| $242K | ﹤0.01% |
83,600
-23,500
| -22% | -$78.9K |
|
4640
Coursera
COUR
$1.77B
| $242K | ﹤0.01% |
+17,300
| New | +$294K |
|
4641
CALL
Accel Entertainment
ACEL
$1B
| $241K | ﹤0.01% |
20,500
+19,600
| +2,178% | +$209K |
|
4642
CALL
FerroAtlántica
GSM
$590M
| $241K | ﹤0.01% |
48,500
-159,800
| -77% | -$825K |
|
4643
PUT
Sinclair Inc
SBGI
$1.02B
| $241K | ﹤0.01% |
17,900
+13,500
| +307% | +$193K |
|
|
HOLI
4644
DELISTED
Hollsys Automation Technologies INTERNATIONAL, LTD. COMMON (British Virgin Island)
HOLI
| $241K | ﹤0.01% |
9,426
-4,070
| -30% | -$104K |
|
4645
Dolby
DLB
$4.97B
| $240K | ﹤0.01% |
2,869
-6,331
| -69% | -$524K |
|
|
4646
PUT
Accel Entertainment
ACEL
$1B
| $239K | ﹤0.01% |
20,300
-18,200
| -47% | -$194K |
|
|
OPTU
4647
CALL
Optimum Communications Inc
OPTU
$298M
| $239K | ﹤0.01% |
91,900
-49,200
| -35% | -$124K |
|
|
PMT
4648
CALL
PennyMac Mortgage Investment
PMT
$845M
| $239K | ﹤0.01% |
16,300
-12,900
| -44% | -$184K |
|
4649
CALL
First Advantage
FA
$3.69B
| $238K | ﹤0.01% |
+14,700
| New | +$240K |
|
4650
PUT
Kura Oncology
KURA
$793M
| $238K | ﹤0.01% |
11,200
+9,900
| +762% | +$192K |
|
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.