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 | |
|---|---|---|---|---|---|---|
6776
PUT
AudioCodes
AUDC
$239M
| $17K | ﹤0.01% |
1,800
| – | – |
|
6777
PUT
BCB Bancorp
BCBP
$179M
| $17K | ﹤0.01% |
1,400
-400
| -22% | -$4.74K |
|
|
BCYC
6778
Bicycle Therapeutics
BCYC
$269M
| $17K | ﹤0.01% |
771
+251
| +48% | +$5.79K |
|
6779
Blackbaud
BLKB
$1.94B
| $17K | ﹤0.01% |
+207
| New | +$16.5K |
|
|
BRT
6780
PUT
BRT Apartments
BRT
$284M
| $17K | ﹤0.01% |
1,000
-300
| -23% | -$5.45K |
|
6781
PUT
Celularity
CELU
$19.4M
| $17K | ﹤0.01% |
6,000
-7,100
| -54% | -$20.9K |
|
|
CEPU
6782
PUT
Central Puerto
CEPU
$2.16B
| $17K | ﹤0.01% |
1,900
-1,200
| -39% | -$10.9K |
|
6783
Clarivate
CLVT
$1.37B
| $17K | ﹤0.01% |
2,424
+1,534
| +172% | +$9.78K |
|
6784
PUT
Cerence
CRNC
$359M
| $17K | ﹤0.01% |
5,700
-136,800
| -96% | -$402K |
|
|
CVAC
6785
CALL
DELISTED
CureVac
CVAC
| $17K | ﹤0.01% |
5,900
+2,800
| +90% | +$9.22K |
|
|
DCBO
6786
PUT
Docebo
DCBO
$559M
| $17K | ﹤0.01% |
+400
| New | +$16.4K |
|
6787
Embecta
EMBC
$218M
| $17K | ﹤0.01% |
1,232
-977
| -44% | -$14.2K |
|
6788
First Advantage
FA
$3.69B
| $17K | ﹤0.01% |
+895
| New | +$16K |
|
6789
CALL
Fortune Brands Innovations
FBIN
$5.86B
| $17K | ﹤0.01% |
200
-1,700
| -89% | -$130K |
|
6790
PUT
Future Fuel
FF
$205M
| $17K | ﹤0.01% |
3,000
-40,600
| -93% | -$225K |
|
6791
Flux Power
FLUX
$10.9M
| $17K | ﹤0.01% |
5,782
+1,367
| +31% | +$4.6K |
|
6792
PUT
FingerMotion
FNGR
$14.8M
| $17K | ﹤0.01% |
8,000
+3,800
| +90% | +$7.87K |
|
6793
PUT
Renaissance International IPO ETF
IPOS
$10.7M
| $17K | ﹤0.01% |
+400
| New | +$5.17K |
|
6794
CALL
Jack Henry & Associates
JKHY
$11.4B
| $17K | ﹤0.01% |
100
-100
| -50% | -$16.9K |
|
|
6795
Jack Henry & Associates
JKHY
$11.4B
| $17K | ﹤0.01% |
+97
| New | +$16.4K |
|
|
KALV
6796
CALL
DELISTED
KalVista Pharmaceuticals
KALV
| $17K | ﹤0.01% |
1,500
-500
| -25% | -$6.29K |
|
|
MZTI
6797
PUT
The Marzetti Company
MZTI
$3.05B
| $17K | ﹤0.01% |
+100
| New | +$18.4K |
|
6798
Markel Group
MKL
$25.2B
| $17K | ﹤0.01% |
11
-206
| -95% | -$322K |
|
6799
PUT
MillerKnoll
MLKN
$1.56B
| $17K | ﹤0.01% |
700
-12,500
| -95% | -$347K |
|
6800
PUT
Madison Square Garden
MSGE
$3.59B
| $17K | ﹤0.01% |
400
-4,000
| -91% | -$156K |
|
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.