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 | |
|---|---|---|---|---|---|---|
3676
PUT
SS&C Technologies
SSNC
$18.1B
| $460K | ﹤0.01% |
6,200
+3,900
| +170% | +$277K |
|
3677
PUT
Icon
ICLR
$13B
| $459K | ﹤0.01% |
1,600
-800
| -33% | -$252K |
|
3678
CALL
Vanguard S&P 500 Growth ETF
VOOG
$25.3B
| $459K | ﹤0.01% |
12,000
+1,800
| +18% | +$99.9K |
|
3679
PUT
ADT
ADT
$5.24B
| $458K | ﹤0.01% |
63,400
-11,400
| -15% | -$83.6K |
|
3680
CALL
Badger Meter
BMI
$3.71B
| $458K | ﹤0.01% |
2,100
-4,700
| -69% | -$942K |
|
3681
CALL
Cheesecake Factory
CAKE
$4.32B
| $458K | ﹤0.01% |
11,300
-64,700
| -85% | -$2.46M |
|
3682
C4 Therapeutics
CCCC
$397M
| $458K | ﹤0.01% |
80,499
+38,398
| +91% | +$231K |
|
3683
W.W. Grainger
GWW
$66B
| $458K | ﹤0.01% |
+441
| New | +$427K |
|
3684
Centrus Energy
LEU
$3.46B
| $458K | ﹤0.01% |
8,361
-66
| -0.8% | -$2.76K |
|
3685
CALL
Weatherford International
WFRD
$6.16B
| $458K | ﹤0.01% |
5,400
-6,000
| -53% | -$647K |
|
3686
Amplify Energy
AMPY
$155M
| $457K | ﹤0.01% |
69,988
+32,877
| +89% | +$228K |
|
3687
Boise Cascade
BCC
$2.75B
| $457K | ﹤0.01% |
3,247
+2,354
| +264% | +$307K |
|
3688
PUT
Camden Property Trust
CPT
$11.2B
| $457K | ﹤0.01% |
3,700
-2,200
| -37% | -$260K |
|
3689
CALL
Inhibrx
INBX
$1.21B
| $457K | ﹤0.01% |
+29,200
| New | +$410K |
|
3690
PUT
Progyny
PGNY
$2.47B
| $457K | ﹤0.01% |
27,300
+24,000
| +727% | +$576K |
|
3691
Sprout Social
SPT
$500M
| $457K | ﹤0.01% |
15,750
+2,175
| +16% | +$70.8K |
|
3692
CALL
Compass Minerals
CMP
$1.25B
| $456K | ﹤0.01% |
38,000
+30,800
| +428% | +$326K |
|
3693
PUT
Fluence Energy
FLNC
$1.79B
| $456K | ﹤0.01% |
20,100
-18,300
| -48% | -$331K |
|
3694
Grindr
GRND
$2.75B
| $456K | ﹤0.01% |
+38,247
| New | +$453K |
|
3695
CALL
ICU Medical
ICUI
$4.04B
| $455K | ﹤0.01% |
2,500
+2,300
| +1,150% | +$341K |
|
3696
PUT
Teucrium Agricultural Fund
TAGS
$19.2M
| $455K | ﹤0.01% |
79,600
-300
| -0.4% | -$7.66K |
|
|
CIVI
3697
DELISTED
Civitas Resources
CIVI
| $454K | ﹤0.01% |
8,971
+8,338
| +1,317% | +$516K |
|
3698
PUT
Impinj
PI
$3.97B
| $454K | ﹤0.01% |
2,100
-6,200
| -75% | -$1.05M |
|
3699
PUT
The Bancorp
TBBK
$2.81B
| $454K | ﹤0.01% |
+8,500
| New | +$411K |
|
3700
PUT
AllianceBernstein
AB
$3.54B
| $453K | ﹤0.01% |
13,000
-31,100
| -71% | -$1.06M |
|
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.