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 | |
|---|---|---|---|---|---|---|
4201
PUT
Mattel
MAT
$4.49B
| $280K | ﹤0.01% |
14,700
+5,200
| +55% | +$95.8K |
|
|
ZK
4202
CALL
DELISTED
Zeekr
ZK
| $280K | ﹤0.01% |
12,600
+11,600
| +1,160% | +$197K |
|
4203
Cooper Companies
COO
$14.1B
| $279K | ﹤0.01% |
+2,529
| New | +$246K |
|
4204
FS KKR Capital
FSK
$3.08B
| $279K | ﹤0.01% |
+14,142
| New | +$281K |
|
4205
PUT
AudioEye
AEYE
$75.8M
| $278K | ﹤0.01% |
12,200
-14,000
| -53% | -$308K |
|
4206
Cheesecake Factory
CAKE
$4.42B
| $278K | ﹤0.01% |
+6,867
| New | +$261K |
|
4207
Ionis Pharmaceuticals
IONS
$9.14B
| $278K | ﹤0.01% |
6,944
-56,403
| -89% | -$2.62M |
|
4208
CALL
Cheniere Energy
CQP
$31B
| $277K | ﹤0.01% |
5,700
+4,500
| +375% | +$224K |
|
|
AGNT
4209
CALL
AGNT Inc
AGNT
$661M
| $277K | ﹤0.01% |
19,700
-19,600
| -50% | -$253K |
|
|
DVAX
4210
DELISTED
Dynavax Technologies
DVAX
| $276K | ﹤0.01% |
24,829
+17,787
| +253% | +$196K |
|
4211
CALL
Ezcorp Inc
EZPW
$1.85B
| $276K | ﹤0.01% |
24,700
+12,700
| +106% | +$139K |
|
|
GOGL
4212
PUT
DELISTED
Golden Ocean Group
GOGL
| $276K | ﹤0.01% |
20,700
-23,100
| -53% | -$287K |
|
4213
CALL
NCR Atleos
NATL
$3.47B
| $276K | ﹤0.01% |
9,700
-5,600
| -37% | -$163K |
|
4214
CALL
Valvoline
VVV
$5.13B
| $276K | ﹤0.01% |
6,600
+4,100
| +164% | +$174K |
|
4215
CALL
Acuity Brands
AYI
$10.3B
| $275K | ﹤0.01% |
1,000
-400
| -29% | -$99.4K |
|
4216
BlackBerry
BB
$4.74B
| $275K | ﹤0.01% |
105,091
-74,133
| -41% | -$177K |
|
|
MOMO
4217
CALL
Hello Group
MOMO
$869M
| $275K | ﹤0.01% |
36,200
-227,600
| -86% | -$1.51M |
|
4218
Matador Resources
MTDR
$5.73B
| $275K | ﹤0.01% |
5,579
+836
| +18% | +$47.1K |
|
4219
Blue Bird Corp
BLBD
$2.34B
| $274K | ﹤0.01% |
+5,720
| New | +$283K |
|
4220
Domo
DOMO
$177M
| $274K | ﹤0.01% |
36,537
-67,338
| -65% | -$514K |
|
4221
PUT
NatWest
NWG
$70.6B
| $274K | ﹤0.01% |
29,300
-36,100
| -55% | -$321K |
|
4222
CALL
Treace Medical Concepts
TMCI
$260M
| $274K | ﹤0.01% |
47,400
-200
| -0.4% | -$1.28K |
|
4223
Arista Networks
ANET
$214B
| $273K | ﹤0.01% |
+2,848
| New | +$248K |
|
|
CAN
4224
CALL
Canaan Creative
CAN
$178M
| $273K | ﹤0.01% |
270,400
-207,000
| -43% | -$206K |
|
4225
PUT
Krispy Kreme
DNUT
$564M
| $273K | ﹤0.01% |
25,500
+1,900
| +8% | +$20.7K |
|
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.