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 | |
|---|---|---|---|---|---|---|
751
CALL
Petrobras
PBR
$122B
| $16.2M | 0.01% |
1,126,500
+50,100
| +5% | +$737K |
|
752
Dell
DELL
$284B
| $16.2M | 0.01% |
136,887
+30,327
| +28% | +$3.53M |
|
753
PUT
XPO
XPO
$25.1B
| $16.2M | 0.01% |
150,300
-74,200
| -33% | -$8.3M |
|
754
Albemarle
ALB
$13.8B
| $16.1M | 0.01% |
170,216
+113,256
| +199% | +$10.1M |
|
755
PUT
McKesson
MCK
$96.5B
| $16.1M | 0.01% |
32,600
+12,300
| +61% | +$6.85M |
|
756
CALL
Realty Income
O
$60.4B
| $16.1M | 0.01% |
253,500
+90,100
| +55% | +$5.36M |
|
757
PUT
Ross Stores
ROST
$74.5B
| $16M | 0.01% |
106,600
-23,600
| -18% | -$3.48M |
|
758
CALL
UiPath
PATH
$5.28B
| $16M | 0.01% |
1,252,100
-390,800
| -24% | -$4.78M |
|
|
AXON
759
CALL
Axon Enterprise
AXON
$39.6B
| $16M | 0.01% |
40,100
-9,600
| -19% | -$3.31M |
|
760
Unity
U
$12.6B
| $16M | 0.01% |
706,351
+297,872
| +73% | +$5.14M |
|
761
PUT
Caesars Entertainment
CZR
$6.09B
| $15.9M | 0.01% |
381,800
-38,400
| -9% | -$1.44M |
|
762
PUT
FTAI Aviation
FTAI
$22.2B
| $15.9M | 0.01% |
119,700
-30,100
| -20% | -$3.41M |
|
763
PUT
Warner Bros
WBD
$65.1B
| $15.9M | 0.01% |
1,925,200
+31,900
| +2% | +$249K |
|
|
IPFF
764
CALL
DELISTED
iShares International Preferred Stock ETF
IPFF
| $15.8M | 0.01% |
276,000
-232,600
| -46% | -$13.3M |
|
765
PUT
Interactive Brokers
IBKR
$40.9B
| $15.8M | 0.01% |
454,400
+174,800
| +63% | +$5.41M |
|
|
AXON
766
PUT
Axon Enterprise
AXON
$39.6B
| $15.8M | 0.01% |
39,600
| – | – |
|
767
CALL
Sun Communities
SUI
$14.8B
| $15.8M | 0.01% |
117,000
+107,400
| +1,119% | +$14.1M |
|
768
CALL
Expedia Group
EXPE
$30.9B
| $15.8M | 0.01% |
106,500
-51,100
| -32% | -$6.77M |
|
769
PUT
TKO Group
TKO
$13.5B
| $15.7M | 0.01% |
127,200
+70,000
| +122% | +$8M |
|
770
CALL
Oneok
OKE
$58.7B
| $15.7M | 0.01% |
172,600
-5,900
| -3% | -$513K |
|
|
IPFF
771
PUT
DELISTED
iShares International Preferred Stock ETF
IPFF
| $15.7M | 0.01% |
290,100
-266,500
| -48% | -$14.4M |
|
772
CALL
Celestica
CLS
$38.5B
| $15.6M | 0.01% |
304,300
+75,800
| +33% | +$3.92M |
|
773
CALL
Schwab US Broad Market ETF
SCHB
$42.7B
| $15.5M | 0.01% |
686,400
+288,600
| +73% | +$6.16M |
|
774
PUT
On Holding
ONON
$11.6B
| $15.5M | 0.01% |
309,500
-341,800
| -52% | -$14.7M |
|
775
CALL
American Electric Power
AEP
$73.4B
| $15.5M | 0.01% |
150,700
-142,600
| -49% | -$13.9M |
|
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.