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 | |
|---|---|---|---|---|---|---|
676
PUT
General Mills
GIS
$19.1B
| $16.6M | 0.01% |
259,500
+80,600
| +45% | +$5.7M |
|
677
PUT
Arm
ARM
$298B
| $16.6M | 0.01% |
+309,900
| New | +$17.1M |
|
678
CALL
Align Technology
ALGN
$11.9B
| $16.5M | 0.01% |
54,200
+24,600
| +83% | +$8.5M |
|
679
CALL
GSK
GSK
$101B
| $16.5M | 0.01% |
491,000
+180,400
| +58% | +$6.4M |
|
680
PUT
BILL Holdings
BILL
$4.13B
| $16.5M | 0.01% |
152,000
-25,800
| -15% | -$2.94M |
|
681
PUT
BHP
BHP
$213B
| $16.5M | 0.01% |
290,600
-3,100
| -1% | -$181K |
|
682
CALL
Coherent
COHR
$61B
| $16.4M | 0.01% |
504,000
+324,500
| +181% | +$13.3M |
|
683
CALL
PENN Entertainment
PENN
$2.72B
| $16.4M | 0.01% |
712,500
+396,800
| +126% | +$9.6M |
|
684
CALL
Duke Energy
DUK
$101B
| $16.3M | 0.01% |
185,100
+50,700
| +38% | +$4.65M |
|
685
CALL
Rio Tinto
RIO
$148B
| $16.3M | 0.01% |
256,100
-97,500
| -28% | -$6.22M |
|
686
PUT
Lantheus
LNTH
$6.72B
| $16.3M | 0.01% |
233,900
+186,200
| +390% | +$13.6M |
|
687
PUT
Ally Financial
ALLY
$13.3B
| $16.2M | 0.01% |
608,800
-82,300
| -12% | -$2.3M |
|
688
CALL
Burlington
BURL
$21.3B
| $16.2M | 0.01% |
119,600
+64,300
| +116% | +$10.3M |
|
689
PUT
American International
AIG
$41.6B
| $16.1M | 0.01% |
265,500
-58,100
| -18% | -$3.47M |
|
690
CALL
Best Buy
BBY
$17.6B
| $16.1M | 0.01% |
231,200
+27,200
| +13% | +$2.1M |
|
691
CALL
NetEase
NTES
$76.8B
| $16M | 0.01% |
159,700
+60,300
| +61% | +$6.18M |
|
692
CALL
Williams-Sonoma
WSM
$25.5B
| $16M | 0.01% |
205,400
+72,800
| +55% | +$5.01M |
|
|
MRO
693
PUT
DELISTED
Marathon Oil Corporation
MRO
| $15.9M | 0.01% |
594,100
+114,500
| +24% | +$2.96M |
|
694
Energy Transfer Partners
ET
$70.2B
| $15.9M | 0.01% |
1,130,414
+859,967
| +318% | +$11.4M |
|
695
CALL
General Dynamics
GD
$102B
| $15.8M | 0.01% |
71,700
+49,500
| +223% | +$10.9M |
|
696
PUT
Prudential Financial
PRU
$40.8B
| $15.8M | 0.01% |
166,100
-126,600
| -43% | -$12M |
|
697
PUT
Simon Property Group
SPG
$73.1B
| $15.7M | 0.01% |
145,600
+51,300
| +54% | +$6.01M |
|
698
CALL
Interactive Brokers
IBKR
$40.4B
| $15.7M | 0.01% |
726,000
+587,200
| +423% | +$13.1M |
|
699
PUT
Fortinet
FTNT
$111B
| $15.7M | 0.01% |
267,200
+198,000
| +286% | +$13.1M |
|
700
Intel
INTC
$499B
| $15.7M | 0.01% |
440,991
-111,194
| -20% | -$3.87M |
|
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.