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 | |
|---|---|---|---|---|---|---|
1401
PUT
Sarepta Therapeutics
SRPT
$1.66B
| $5.71M | ﹤0.01% |
45,700
-91,300
| -67% | -$12.6M |
|
1402
PUT
KeyCorp
KEY
$24.3B
| $5.71M | ﹤0.01% |
340,700
-435,800
| -56% | -$6.91M |
|
1403
Whirlpool
WHR
$2.42B
| $5.7M | ﹤0.01% |
53,303
+31,573
| +145% | +$3.17M |
|
1404
CALL
Alaska Air
ALK
$5.15B
| $5.7M | ﹤0.01% |
126,100
+9,200
| +8% | +$349K |
|
1405
PUT
UBS Group
UBS
$170B
| $5.7M | ﹤0.01% |
184,400
-36,400
| -16% | -$1.09M |
|
1406
NextEra Energy
NEE
$187B
| $5.68M | ﹤0.01% |
67,203
+32,409
| +93% | +$2.53M |
|
1407
CALL
Aptiv
APTV
$12B
| $5.67M | ﹤0.01% |
78,700
-93,700
| -54% | -$6.54M |
|
1408
PUT
DigitalOcean
DOCN
$14.4B
| $5.66M | ﹤0.01% |
140,100
+90,200
| +181% | +$3.22M |
|
1409
Golar LNG
GLNG
$4.95B
| $5.63M | ﹤0.01% |
153,307
+45,506
| +42% | +$1.52M |
|
1410
CALL
Innovative Industrial Properties
IIPR
$1.78B
| $5.63M | ﹤0.01% |
41,800
-27,100
| -39% | -$3.3M |
|
1411
PUT
Manhattan Associates
MANH
$8.97B
| $5.6M | ﹤0.01% |
19,900
+18,400
| +1,227% | +$4.68M |
|
1412
CALL
ProShares Ultra S&P500
SSO
$7.82B
| $5.6M | ﹤0.01% |
130,800
| – | – |
|
1413
PUT
Cardinal Health
CAH
$53.4B
| $5.58M | ﹤0.01% |
50,500
-105,100
| -68% | -$11M |
|
1414
CALL
Harley-Davidson
HOG
$2.68B
| $5.58M | ﹤0.01% |
144,800
-83,000
| -36% | -$3.01M |
|
1415
PUT
Summit Therapeutics
SMMT
$10.6B
| $5.57M | ﹤0.01% |
254,400
+241,100
| +1,813% | +$3.37M |
|
1416
CALL
FirstEnergy
FE
$28.9B
| $5.57M | ﹤0.01% |
125,500
-13,600
| -10% | -$572K |
|
1417
PUT
Lantheus
LNTH
$6.82B
| $5.56M | ﹤0.01% |
50,700
+9,700
| +24% | +$1.01M |
|
|
PR
1418
CALL
Permian Resources
PR
$17.9B
| $5.56M | ﹤0.01% |
408,700
+116,000
| +40% | +$1.7M |
|
1419
PUT
monday.com
MNDY
$3.27B
| $5.55M | ﹤0.01% |
20,000
-66,200
| -77% | -$16.4M |
|
1420
PUT
Guidewire Software
GWRE
$11.5B
| $5.54M | ﹤0.01% |
30,300
-12,800
| -30% | -$1.94M |
|
1421
PUT
Virgin Galactic
SPCE
$320M
| $5.54M | ﹤0.01% |
908,100
+33,900
| +4% | +$227K |
|
1422
PUT
Cummins
CMI
$91.7B
| $5.54M | ﹤0.01% |
17,100
+3,700
| +28% | +$1.1M |
|
1423
CALL
QuantumScape Corp
QS
$3B
| $5.53M | ﹤0.01% |
961,300
+464,900
| +94% | +$2.86M |
|
|
EDR
1424
CALL
DELISTED
Endeavor Group Holdings, Inc.
EDR
| $5.52M | ﹤0.01% |
193,400
-157,200
| -45% | -$4.32M |
|
1425
PUT
Cooper Companies
COO
$13.7B
| $5.52M | ﹤0.01% |
50,000
+48,700
| +3,746% | +$4.74M |
|
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.