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 | |
|---|---|---|---|---|---|---|
3926
Shoals Technologies Group
SHLS
$1.43B
| $365K | ﹤0.01% |
65,111
-51,410
| -44% | -$307K |
|
|
ZK
3927
PUT
DELISTED
Zeekr
ZK
| $365K | ﹤0.01% |
16,400
+14,800
| +925% | +$251K |
|
3928
Alexandria Real Estate Equities
ARE
$9.41B
| $364K | ﹤0.01% |
3,069
-4,374
| -59% | -$521K |
|
3929
CALL
Torrid Holdings
CURV
$271M
| $364K | ﹤0.01% |
92,800
-28,600
| -24% | -$193K |
|
3930
CALL
Civeo
CVEO
$375M
| $364K | ﹤0.01% |
13,300
+13,200
| +13,200% | +$349K |
|
3931
PUT
Denali Therapeutics
DNLI
$3.82B
| $364K | ﹤0.01% |
12,500
-900
| -7% | -$22.3K |
|
3932
PUT
Equinox Gold
EQX
$7.21B
| $364K | ﹤0.01% |
59,900
-2,600
| -4% | -$14.7K |
|
3933
PUT
Henry Schein
HSIC
$9.76B
| $364K | ﹤0.01% |
5,000
-800
| -14% | -$55.5K |
|
3934
CALL
Beam Therapeutics
BEAM
$2.71B
| $362K | ﹤0.01% |
14,800
-1,400
| -9% | -$36.2K |
|
|
BZUN
3935
PUT
Baozun
BZUN
$168M
| $362K | ﹤0.01% |
+101,300
| New | +$250K |
|
3936
CALL
Lazard
LAZ
$4.21B
| $362K | ﹤0.01% |
7,200
-8,100
| -53% | -$375K |
|
3937
PUT
ARS Pharmaceuticals
SPRY
$563M
| $362K | ﹤0.01% |
25,000
+15,300
| +158% | +$182K |
|
3938
Amylyx Pharmaceuticals
AMLX
$2.17B
| $361K | ﹤0.01% |
111,728
-108,789
| -49% | -$245K |
|
3939
CALL
Curtiss-Wright
CW
$26.9B
| $361K | ﹤0.01% |
+1,100
| New | +$326K |
|
|
KLG
3940
CALL
DELISTED
WK Kellogg Co
KLG
| $361K | ﹤0.01% |
21,100
-2,800
| -12% | -$48K |
|
|
ESPR
3941
CALL
DELISTED
Esperion Therapeutics
ESPR
| $360K | ﹤0.01% |
218,600
-70,900
| -24% | -$143K |
|
3942
PUT
Principal Financial Group
PFG
$24.6B
| $360K | ﹤0.01% |
4,200
-5,100
| -55% | -$412K |
|
3943
PUT
RadNet
RDNT
$4.97B
| $360K | ﹤0.01% |
5,200
-5,600
| -52% | -$353K |
|
|
ALTM
3944
PUT
DELISTED
Arcadium Lithium plc
ALTM
| $360K | ﹤0.01% |
126,600
+36,700
| +41% | +$106K |
|
3945
CALL
Core & Main
CNM
$8.24B
| $359K | ﹤0.01% |
8,100
-76,400
| -90% | -$3.66M |
|
3946
PUT
ICL Group
ICL
$6.75B
| $359K | ﹤0.01% |
84,600
-138,300
| -62% | -$586K |
|
3947
Booz Allen Hamilton
BAH
$8.78B
| $358K | ﹤0.01% |
2,202
+1,673
| +316% | +$256K |
|
|
RC
3948
PUT
Ready Capital
RC
$263M
| $358K | ﹤0.01% |
47,000
-194,100
| -81% | -$1.65M |
|
3949
CALL
Thomson Reuters
TRI
$45.1B
| $358K | ﹤0.01% |
2,068
+1,379
| +200% | +$233K |
|
3950
YieldMax Ultra Option Income Strategy ETF
ULTY
$763M
| $358K | ﹤0.01% |
3,385
+2,906
| +607% | +$342K |
|
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.