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 | |
|---|---|---|---|---|---|---|
5551
PUT
The RealReal
REAL
$1.46B
| $71K | ﹤0.01% |
22,900
-53,800
| -70% | -$162K |
|
5552
CALL
Banco Santander
SAN
$201B
| $71K | ﹤0.01% |
14,000
-10,700
| -43% | -$51.4K |
|
5553
ProShares UltraShort Bloomberg Crude Oil
SCO
$671M
| $71K | ﹤0.01% |
+913
| New | +$64.2K |
|
5554
PUT
Sagimet Biosciences
SGMT
$439M
| $71K | ﹤0.01% |
25,900
-5,100
| -16% | -$15.7K |
|
5555
PUT
Telesat
TSAT
$567M
| $71K | ﹤0.01% |
5,400
+3,000
| +125% | +$28.6K |
|
5556
10x Genomics
TXG
$6B
| $71K | ﹤0.01% |
+3,169
| New | +$65.5K |
|
5557
Vanguard Long-Term Treasury ETF
VGLT
$10B
| $71K | ﹤0.01% |
1,155
-2,600
| -69% | -$157K |
|
|
VRE
5558
DELISTED
Veris Residential
VRE
| $71K | ﹤0.01% |
4,031
+2,538
| +170% | +$41.8K |
|
|
EDR
5559
PUT
DELISTED
Endeavor Group Holdings, Inc.
EDR
| $71K | ﹤0.01% |
2,500
+1,700
| +213% | +$46.7K |
|
5560
Atomera
ATOM
$200M
| $70K | ﹤0.01% |
26,634
-27,254
| -51% | -$84.9K |
|
5561
PUT
Cabaletta Bio
CABA
$437M
| $70K | ﹤0.01% |
14,900
-3,600
| -19% | -$20.8K |
|
|
CSR
5562
CALL
Centerspace
CSR
$921M
| $70K | ﹤0.01% |
1,000
| – | – |
|
|
DEA
5563
PUT
Easterly Government Properties
DEA
$1.13B
| $70K | ﹤0.01% |
2,080
-2,200
| -51% | -$73.7K |
|
5564
PUT
FTAI Infrastructure
FIP
$441M
| $70K | ﹤0.01% |
7,500
-5,000
| -40% | -$46.4K |
|
5565
PUT
Grand Canyon Education
LOPE
$3.79B
| $70K | ﹤0.01% |
500
-100
| -17% | -$14.4K |
|
5566
CALL
MasterBrand
MBC
$1.06B
| $70K | ﹤0.01% |
3,800
-500
| -12% | -$8.15K |
|
5567
PUT
Mercury Systems
MRCY
$5.83B
| $70K | ﹤0.01% |
1,900
+1,400
| +280% | +$49.3K |
|
5568
PUT
Magnachip Semiconductor
MX
$119M
| $70K | ﹤0.01% |
15,200
-7,200
| -32% | -$35K |
|
5569
Phreesia
PHR
$663M
| $70K | ﹤0.01% |
+3,088
| New | +$72.3K |
|
5570
CALL
SGHC Ltd
SGHC
$7.11B
| $70K | ﹤0.01% |
+19,300
| New | +$66.5K |
|
5571
CALL
Upbound Group
UPBD
$1.13B
| $70K | ﹤0.01% |
2,200
-300
| -12% | -$9.64K |
|
|
VTYX
5572
CALL
DELISTED
Ventyx Biosciences
VTYX
| $70K | ﹤0.01% |
32,200
+29,300
| +1,010% | +$67.4K |
|
|
LAR
5573
Lithium Argentina AG
LAR
$985M
| $70K | ﹤0.01% |
+21,700
| New | +$60.2K |
|
|
TUZ
5574
CALL
DELISTED
PIMCO 1-3 Year U.S. Treasury Index Exchange-Traded Fund
TUZ
| $70K | ﹤0.01% |
900
-7,600
| -89% | -$591K |
|
5575
PUT
InfraCap MLP ETF
AMZA
$470M
| $69K | ﹤0.01% |
2,300
+300
| +15% | +$12.2K |
|
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.