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 | |
|---|---|---|---|---|---|---|
4501
Mueller Industries
MLI
$14.5B
| $203K | ﹤0.01% |
5,484
+5,436
| +11,325% | +$182K |
|
4502
Dave & Buster's
PLAY
$357M
| $203K | ﹤0.01% |
5,990
-16,397
| -73% | -$559K |
|
|
PETQ
4503
PUT
DELISTED
PetIQ, Inc. Class A Common Stock
PETQ
| $203K | ﹤0.01% |
6,600
+5,100
| +340% | +$138K |
|
4504
uniQure
QURE
$2.75B
| $202K | ﹤0.01% |
+40,992
| New | +$267K |
|
4505
Invesco DB US Dollar Index Bullish Fund
UUP
$423M
| $202K | ﹤0.01% |
+7,203
| New | +$205K |
|
4506
CALL
Dana Inc
DAN
$2.88B
| $201K | ﹤0.01% |
19,100
+300
| +2% | +$3.31K |
|
4507
PUT
Delek Logistics
DKL
$3.12B
| $201K | ﹤0.01% |
4,600
+2,100
| +84% | +$85.8K |
|
|
DVAX
4508
PUT
DELISTED
Dynavax Technologies
DVAX
| $201K | ﹤0.01% |
18,100
-18,600
| -51% | -$205K |
|
4509
PUT
Grindr
GRND
$3.06B
| $201K | ﹤0.01% |
16,900
-1,700
| -9% | -$20.1K |
|
4510
PUT
Labcorp
LH
$25.2B
| $201K | ﹤0.01% |
900
-12,400
| -93% | -$2.73M |
|
4511
PUT
Jackson Financial
JXN
$8.4B
| $200K | ﹤0.01% |
2,200
-5,200
| -70% | -$434K |
|
4512
PUT
KLX Energy Services
KLXE
$43.1M
| $200K | ﹤0.01% |
36,600
-11,200
| -23% | -$67.8K |
|
4513
CALL
Warner Music
WMG
$15.2B
| $200K | ﹤0.01% |
6,400
-1,200
| -16% | -$35.5K |
|
|
ARIS
4514
PUT
DELISTED
Aris Water Solutions
ARIS
| $199K | ﹤0.01% |
11,800
+11,200
| +1,867% | +$181K |
|
4515
PUT
Oportun Financial
OPRT
$262M
| $199K | ﹤0.01% |
71,100
+13,200
| +23% | +$38.3K |
|
4516
CALL
Protolabs
PRLB
$1.7B
| $199K | ﹤0.01% |
6,800
+1,600
| +31% | +$48.8K |
|
4517
Sturm, Ruger & Co
RGR
$603M
| $199K | ﹤0.01% |
+4,782
| New | +$202K |
|
|
AGEN
4518
PUT
Agenus
AGEN
$276M
| $198K | ﹤0.01% |
36,200
-71,600
| -66% | -$536K |
|
4519
CALL
Avery Dennison
AVY
$12.8B
| $198K | ﹤0.01% |
900
-3,200
| -78% | -$691K |
|
4520
CALL
Freedom Holding
FRHC
$9.44B
| $198K | ﹤0.01% |
2,100
-2,800
| -57% | -$243K |
|
4521
Martin Marietta Materials
MLM
$34.2B
| $198K | ﹤0.01% |
369
-1,225
| -77% | -$662K |
|
4522
PUT
Suzano
SUZ
$10.2B
| $198K | ﹤0.01% |
19,800
+17,600
| +800% | +$172K |
|
4523
Tetra Tech
TTEK
$8.77B
| $198K | ﹤0.01% |
+4,209
| New | +$187K |
|
4524
CALL
Vericel Corp
VCEL
$2.38B
| $198K | ﹤0.01% |
4,700
+1,200
| +34% | +$57.1K |
|
4525
CALL
Vir Biotechnology
VIR
$1.46B
| $198K | ﹤0.01% |
26,500
+2,700
| +11% | +$23.5K |
|
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.