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 |
Boeing
BA
|
+$55.8M |
| 2 |
Microsoft
MSFT
|
+$42.2M |
| 3 |
Pinduoduo
PDD
|
+$41.3M |
| 4 |
Apple
AAPL
|
+$32M |
| 5 |
Direxion Daily Semiconductor Bull 3X ETF
SOXL
|
+$28.3M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
Broadcom
AVGO
|
+$95.2M |
| 2 |
Citigroup
C
|
+$57.2M |
| 3 |
Pfizer
PFE
|
+$56.4M |
| 4 |
TSMC
TSM
|
+$39.7M |
| 5 |
Starbucks
SBUX
|
+$35.5M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Technology | 0.4% |
| 2 | Consumer Discretionary | 0.29% |
| 3 | Healthcare | 0.15% |
| 4 | Industrials | 0.13% |
| 5 | Financials | 0.13% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
2501
Under Armour
UAA
$3B
| $1.56M | ﹤0.01% |
175,482
-260,307
| -60% | -$1.94M |
|
2502
iShares MSCI Emerging Markets ETF
EEM
$28B
| $1.56M | ﹤0.01% |
+34,045
| New | +$1.47M |
|
|
ARCH
2503
PUT
DELISTED
Arch Resources, Inc.
ARCH
| $1.56M | ﹤0.01% |
11,300
+900
| +9% | +$124K |
|
2504
Public Service Enterprise Group
PEG
$39.8B
| $1.56M | ﹤0.01% |
+17,481
| New | +$1.4M |
|
2505
PUT
Louisiana-Pacific
LPX
$5.2B
| $1.56M | ﹤0.01% |
14,500
-22,500
| -61% | -$2.12M |
|
2506
Capri Holdings
CPRI
$1.77B
| $1.56M | ﹤0.01% |
36,666
+32,742
| +834% | +$1.15M |
|
|
AY
2507
CALL
DELISTED
Atlantica Sustainable Infrastructure plc Ordinary Shares
AY
| $1.56M | ﹤0.01% |
70,800
-8,300
| -10% | -$183K |
|
2508
PUT
American Water Works
AWK
$26.3B
| $1.55M | ﹤0.01% |
10,600
-33,000
| -76% | -$4.68M |
|
2509
CALL
Upwork
UPWK
$1.09B
| $1.54M | ﹤0.01% |
147,900
-6,800
| -4% | -$70.9K |
|
2510
CALL
Macerich
MAC
$7.32B
| $1.54M | ﹤0.01% |
84,700
+20,700
| +32% | +$326K |
|
2511
CALL
Teucrium Agricultural Fund
TAGS
$19.6M
| $1.54M | ﹤0.01% |
269,700
+182,700
| +210% | +$4.67M |
|
2512
Roper Technologies
ROP
$36.3B
| $1.54M | ﹤0.01% |
+2,767
| New | +$1.52M |
|
2513
PUT
Healthcare Realty
HR
$7.42B
| $1.53M | ﹤0.01% |
84,500
-27,800
| -25% | -$493K |
|
|
MASI
2514
CALL
DELISTED
Masimo
MASI
| $1.53M | ﹤0.01% |
11,500
+8,600
| +297% | +$998K |
|
2515
Universal Display
OLED
$3.71B
| $1.53M | ﹤0.01% |
7,304
+224
| +3% | +$45.4K |
|
2516
PUT
Sturm, Ruger & Co
RGR
$610M
| $1.53M | ﹤0.01% |
36,800
-200
| -0.5% | -$8.44K |
|
2517
Kanzhun
BZ
$6.89B
| $1.53M | ﹤0.01% |
+88,210
| New | +$1.28M |
|
2518
CALL
InterDigital
IDCC
$6.68B
| $1.53M | ﹤0.01% |
10,800
-3,300
| -23% | -$433K |
|
2519
Verisk Analytics
VRSK
$26.4B
| $1.53M | ﹤0.01% |
5,708
+5,479
| +2,393% | +$1.48M |
|
2520
InMode
INMD
$872M
| $1.53M | ﹤0.01% |
90,079
-20,757
| -19% | -$350K |
|
2521
CALL
AllianceBernstein
AB
$3.47B
| $1.52M | ﹤0.01% |
43,700
-2,400
| -5% | -$82K |
|
2522
Emcor
EME
$33.1B
| $1.52M | ﹤0.01% |
+3,537
| New | +$1.33M |
|
2523
State Street SPDR Portfolio S&P 500 Growth ETF
SPYG
$50.7B
| $1.52M | ﹤0.01% |
18,360
-24,548
| -57% | -$1.96M |
|
2524
PUT
F5
FFIV
$22.1B
| $1.52M | ﹤0.01% |
6,900
+4,700
| +214% | +$911K |
|
|
NVO
2525
Novo Nordisk
NVO
$216B
| $1.51M | ﹤0.01% |
12,717
-104,650
| -89% | -$14M |
|
Similar funds
Simplex Trading's Q3 2024 Portfolio in Review
As of Q3 2024, Simplex Trading held 9,964 positions worth $170B, up 5.3% from $162B the previous quarter. Its ten largest holdings account for 50% of the portfolio.
Simplex Trading's Q3 2024 filing shows 1,185 new, 3,232 increased, 3,829 reduced and 1,476 closed positions. Its largest new stake was Boeing: 325,328 shares worth $49.5M. The largest sale was Broadcom, an estimated $95.2M.
By sector, the portfolio is most concentrated in Technology at 0.4% of assets, down from 0.53% a quarter earlier, followed by Consumer Discretionary and Healthcare.
- Simplex Trading's largest Q3 2024 buy was Boeing: 325,328 shares worth $49.5M.
- Simplex Trading added most to Pinduoduo in Q3 2024, an estimated $41.3M increase.
- Simplex Trading's biggest Q3 2024 reduction was Citigroup, cutting an estimated $57.2M.
- Simplex Trading fully exited Broadcom in Q3 2024, selling an estimated $95.2M.
- Simplex Trading's ten largest holdings make up 50% of its $170B portfolio in Q3 2024.
- Simplex Trading opened 1,185 new positions and closed 1,476 in Q3 2024.
- Simplex Trading's portfolio value rose 5.3% quarter-over-quarter to $170B.
Based on Simplex Trading's 13F filing for Q3 2024, filed 8 Nov 2024.