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 | |
|---|---|---|---|---|---|---|
4151
CALL
USA Compression Partners
USAC
$3.75B
| $295K | ﹤0.01% |
12,900
+3,400
| +36% | +$77.3K |
|
4152
PUT
Calix
CALX
$2.34B
| $294K | ﹤0.01% |
7,600
-11,200
| -60% | -$412K |
|
|
CKPT
4153
CALL
DELISTED
Checkpoint Therapeutics
CKPT
| $294K | ﹤0.01% |
131,400
-16,000
| -11% | -$36.9K |
|
4154
CALL
Neogen
NEOG
$2B
| $294K | ﹤0.01% |
17,500
-21,300
| -55% | -$351K |
|
4155
Zai Lab
ZLAB
$2.1B
| $294K | ﹤0.01% |
12,197
-16,333
| -57% | -$309K |
|
4156
PUT
CNX Resources
CNX
$4.84B
| $293K | ﹤0.01% |
9,000
+1,400
| +18% | +$37.7K |
|
4157
PUT
Global Net Lease
GNL
$1.86B
| $293K | ﹤0.01% |
34,800
+26,700
| +330% | +$224K |
|
4158
CALL
Inovio Pharmaceuticals
INO
$84.7M
| $293K | ﹤0.01% |
50,700
-1,700
| -3% | -$14K |
|
4159
PUT
Vanguard Total Bond Market
BND
$158B
| $292K | ﹤0.01% |
3,900
+2,000
| +105% | +$148K |
|
4160
CALL
United Microelectronic
UMC
$43.6B
| $292K | ﹤0.01% |
34,700
-63,000
| -64% | -$527K |
|
4161
CALL
Universal Corp
UVV
$1.36B
| $292K | ﹤0.01% |
5,500
+1,300
| +31% | +$67.2K |
|
|
GOLD
4162
PUT
Gold.com Inc
GOLD
$1.18B
| $291K | ﹤0.01% |
6,600
-2,300
| -26% | -$88K |
|
4163
CALL
Digital Turbine
APPS
$1.02B
| $291K | ﹤0.01% |
95,000
+46,000
| +94% | +$124K |
|
|
INFA
4164
DELISTED
Informatica
INFA
| $290K | ﹤0.01% |
11,479
-16,491
| -59% | -$418K |
|
4165
PUT
Myriad Genetics
MYGN
$502M
| $290K | ﹤0.01% |
10,600
-2,300
| -18% | -$62.3K |
|
4166
Viavi Solutions
VIAV
$8.66B
| $290K | ﹤0.01% |
32,232
+32,227
| +644,540% | +$256K |
|
4167
PUT
Chegg
CHGG
$121M
| $289K | ﹤0.01% |
163,600
-35,300
| -18% | -$86.5K |
|
4168
CALL
Herbalife
HLF
$1.3B
| $289K | ﹤0.01% |
40,200
-121,600
| -75% | -$1.12M |
|
4169
iShares Core S&P Small-Cap ETF
IJR
$110B
| $289K | ﹤0.01% |
2,477
-17,030
| -87% | -$1.92M |
|
4170
Ascendis Pharma A/S
ASND
$16.7B
| $288K | ﹤0.01% |
+1,934
| New | +$261K |
|
|
BAND
4171
PUT
Bandwidth Inc
BAND
$1.67B
| $288K | ﹤0.01% |
16,500
-2,800
| -15% | -$49.6K |
|
4172
CALL
Gossamer Bio
GOSS
$100M
| $288K | ﹤0.01% |
292,300
+131,300
| +82% | +$126K |
|
4173
Portillo's
PTLO
$339M
| $288K | ﹤0.01% |
21,391
+4,264
| +25% | +$47.6K |
|
4174
PUT
Meritage Homes
MTH
$4.89B
| $287K | ﹤0.01% |
2,800
+2,000
| +250% | +$189K |
|
4175
PUT
Oaktree Specialty Lending
OCSL
$1.06B
| $287K | ﹤0.01% |
17,600
+13,000
| +283% | +$223K |
|
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.