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 | |
|---|---|---|---|---|---|---|
601
PUT
Rio Tinto
RIO
$150B
| $19.4M | 0.02% |
304,200
-110,400
| -27% | -$7.04M |
|
602
Boeing
BA
$164B
| $19.4M | 0.02% |
100,961
-961
| -0.9% | -$210K |
|
|
MRO
603
CALL
DELISTED
Marathon Oil Corporation
MRO
| $19.3M | 0.02% |
722,600
+86,500
| +14% | +$2.24M |
|
604
PUT
PG&E
PCG
$39.9B
| $19.2M | 0.02% |
1,188,100
+402,300
| +51% | +$6.91M |
|
605
CALL
Franco-Nevada
FNV
$41.3B
| $19.1M | 0.02% |
143,100
+37,600
| +36% | +$5.31M |
|
606
CALL
AutoNation
AN
$6.89B
| $19.1M | 0.02% |
126,000
+53,200
| +73% | +$8.49M |
|
607
CALL
Electronic Arts
EA
$52.4B
| $19.1M | 0.02% |
158,300
-40,000
| -20% | -$5.03M |
|
608
CALL
Las Vegas Sands
LVS
$30B
| $19.1M | 0.02% |
415,600
-378,500
| -48% | -$20.5M |
|
609
PUT
APA Corp
APA
$12.8B
| $19M | 0.02% |
462,800
-190,000
| -29% | -$7.82M |
|
610
PUT
ClearShares Piton Intermediate Fixed Income ETF
PIFI
$97.5M
| $19M | 0.01% |
1,112,800
+665,100
| +149% | +$60.5M |
|
611
PUT
Phillips 66
PSX
$84.8B
| $18.9M | 0.01% |
157,600
+33,000
| +26% | +$3.7M |
|
612
CALL
Match Group
MTCH
$8.87B
| $18.9M | 0.01% |
482,800
+217,300
| +82% | +$9.63M |
|
613
CALL
Equinix
EQIX
$101B
| $18.9M | 0.01% |
26,000
+16,400
| +171% | +$12.7M |
|
614
PUT
Wolfspeed
WOLF
$1.52B
| $18.9M | 0.01% |
495,400
+183,400
| +59% | +$9.6M |
|
615
Union Pacific
UNP
$174B
| $18.9M | 0.01% |
92,652
+65,646
| +243% | +$14.3M |
|
616
PUT
Generac Holdings
GNRC
$12.6B
| $18.7M | 0.01% |
172,000
-126,700
| -42% | -$15.7M |
|
617
CALL
BILL Holdings
BILL
$4.17B
| $18.7M | 0.01% |
172,400
-72,100
| -29% | -$8.2M |
|
618
CALL
Arm
ARM
$303B
| $18.7M | 0.01% |
+349,300
| New | +$19.3M |
|
619
CALL
DuPont de Nemours
DD
$18.9B
| $18.7M | 0.01% |
199,645
-204,504
| -51% | -$19.2M |
|
620
PUT
Immunovant
IMVT
$8.02B
| $18.7M | 0.01% |
486,800
+476,400
| +4,581% | +$10.8M |
|
621
CALL
Snap
SNAP
$7.52B
| $18.7M | 0.01% |
2,097,500
-1,370,500
| -40% | -$14.3M |
|
622
CALL
Automatic Data Processing
ADP
$97.2B
| $18.7M | 0.01% |
77,600
+15,100
| +24% | +$3.68M |
|
623
CALL
D.R. Horton
DHI
$40B
| $18.6M | 0.01% |
173,300
-128,400
| -43% | -$15.4M |
|
624
PUT
AstraZeneca
AZN
$263B
| $18.6M | 0.01% |
137,200
-80,800
| -37% | -$11M |
|
625
CALL
Old Dominion Freight Line
ODFL
$48.4B
| $18.5M | 0.01% |
90,600
+24,200
| +36% | +$4.9M |
|
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.