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 |
Amazon
AMZN
|
+$113M |
| 2 |
SPDR Gold Trust
GLD
|
+$68.6M |
| 3 |
NVIDIA
NVDA
|
+$63.4M |
| 4 |
iShares 20+ Year Treasury Bond ETF
TLT
|
+$55.2M |
| 5 |
Apple
AAPL
|
+$54.9M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
Netflix
NFLX
|
+$27.1M |
| 2 |
Qualcomm
QCOM
|
+$24.6M |
| 3 |
Walt Disney
DIS
|
+$21.2M |
| 4 |
Advanced Micro Devices
AMD
|
+$18.2M |
| 5 |
Snowflake
SNOW
|
+$16.1M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Technology | 0.44% |
| 2 | Consumer Discretionary | 0.32% |
| 3 | Healthcare | 0.22% |
| 4 | Financials | 0.17% |
| 5 | Communication Services | 0.15% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
|
DFTX
2676
CALL
Definium Therapeutics
DFTX
$5.73B
| $986K | ﹤0.01% |
315,200
-9,200
| -3% | -$37.8K |
|
|
ICPT
2677
PUT
DELISTED
Intercept Pharmaceuticals, Inc.
ICPT
| $986K | ﹤0.01% |
53,200
-54,200
| -50% | -$613K |
|
2678
CALL
Strategic Education
STRA
$1.71B
| $985K | ﹤0.01% |
13,100
+12,300
| +1,538% | +$905K |
|
2679
CALL
RUM Group Inc
RUM
$1.57B
| $983K | ﹤0.01% |
192,800
-109,200
| -36% | -$816K |
|
2680
PUT
Jack Henry & Associates
JKHY
$10.7B
| $982K | ﹤0.01% |
6,500
+4,000
| +160% | +$645K |
|
2681
Bright Horizons
BFAM
$3.99B
| $981K | ﹤0.01% |
+12,047
| New | +$1.11M |
|
2682
Range Resources
RRC
$9.11B
| $979K | ﹤0.01% |
30,210
-88,883
| -75% | -$2.78M |
|
2683
Markel Group
MKL
$25B
| $977K | ﹤0.01% |
664
+50
| +8% | +$73.2K |
|
2684
PUT
3D Systems Corp
DDD
$420M
| $974K | ﹤0.01% |
198,500
-88,900
| -31% | -$637K |
|
2685
CALL
Huntsman Corp
HUN
$2.24B
| $973K | ﹤0.01% |
39,900
-160,000
| -80% | -$4.34M |
|
2686
CALL
RxSight
RXST
$215M
| $973K | ﹤0.01% |
34,900
+29,700
| +571% | +$886K |
|
|
BIG
2687
CALL
DELISTED
Big Lots, Inc.
BIG
| $973K | ﹤0.01% |
190,600
+148,300
| +351% | +$1.13M |
|
|
HZNP
2688
CALL
DELISTED
Horizon Therapeutics Public Limited Company Ordinary Shares
HZNP
| $973K | ﹤0.01% |
265,300
+167,600
| +172% | +$18M |
|
2689
ProShares Ultra S&P500
SSO
$7.82B
| $971K | ﹤0.01% |
36,390
-65,242
| -64% | -$1.89M |
|
2690
H&R Block
HRB
$5.18B
| $969K | ﹤0.01% |
+22,511
| New | +$831K |
|
2691
CALL
Bentley Systems
BSY
$9.54B
| $968K | ﹤0.01% |
19,300
+3,600
| +23% | +$181K |
|
2692
PUT
Ingersoll Rand
IR
$33B
| $968K | ﹤0.01% |
15,200
-5,600
| -27% | -$373K |
|
2693
CALL
New Fortress Energy
NFE
$101M
| $967K | ﹤0.01% |
29,500
-20,700
| -41% | -$608K |
|
2694
OneMain Financial
OMF
$6.9B
| $967K | ﹤0.01% |
+24,121
| New | +$1.03M |
|
|
ESTE
2695
CALL
DELISTED
Earthstone Energy Inc. Class A Common Stock
ESTE
| $967K | ﹤0.01% |
47,800
+7,700
| +19% | +$134K |
|
2696
CALL
Credit Acceptance
CACC
$6B
| $966K | ﹤0.01% |
2,100
-200
| -9% | -$101K |
|
2697
PUT
Crown Holdings
CCK
$12.8B
| $964K | ﹤0.01% |
10,900
+7,300
| +203% | +$654K |
|
2698
PUT
TC Energy
TRP
$73.5B
| $963K | ﹤0.01% |
28,000
+5,300
| +23% | +$195K |
|
2699
Humana
HUM
$46.7B
| $960K | ﹤0.01% |
1,975
+386
| +24% | +$181K |
|
2700
CALL
UGI
UGI
$8B
| $959K | ﹤0.01% |
41,700
-58,000
| -58% | -$1.44M |
|
Similar funds
Simplex Trading's Q3 2023 Portfolio in Review
As of Q3 2023, Simplex Trading held 10,417 positions worth $127B, up 4.5% from $122B the previous quarter. Its ten largest holdings account for 44% of the portfolio.
Simplex Trading deployed $11.9B of net new capital in Q3 2023, opening 1,399 new positions and adding to 3,690 existing holdings. Its largest new stake was Amazon: 841,102 shares worth $107M.
By sector, the portfolio is most concentrated in Technology at 0.44% of assets, up from 0.41% a quarter earlier, followed by Consumer Discretionary and Healthcare.
On the sell side, the largest reduction was Netflix, an estimated $27.1M trimmed.
- Simplex Trading's largest Q3 2023 buy was Amazon: 841,102 shares worth $107M.
- Simplex Trading added most to SPDR Gold Trust in Q3 2023, an estimated $68.6M increase.
- Simplex Trading's biggest Q3 2023 reduction was Netflix, cutting an estimated $27.1M.
- Simplex Trading fully exited Qualcomm in Q3 2023, selling an estimated $24.6M.
- Simplex Trading's ten largest holdings make up 44% of its $127B portfolio in Q3 2023.
- Simplex Trading opened 1,399 new positions and closed 1,719 in Q3 2023.
- Simplex Trading's portfolio value rose 4.5% quarter-over-quarter to $127B.
Based on Simplex Trading's 13F filing for Q3 2023, filed 1 Nov 2023.