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 | |
|---|---|---|---|---|---|---|
451
CALL
Sarepta Therapeutics
SRPT
$1.67B
| $28.6M | 0.02% |
236,200
+34,300
| +17% | +$3.88M |
|
452
CALL
Warner Bros
WBD
$64.8B
| $28.6M | 0.02% |
2,635,800
+529,900
| +25% | +$6.61M |
|
453
PUT
Biogen
BIIB
$29.2B
| $28.5M | 0.02% |
110,700
+6,000
| +6% | +$1.6M |
|
454
PUT
GE Aerospace
GE
$354B
| $28.4M | 0.02% |
403,591
-315,255
| -44% | -$28.3M |
|
455
CALL
Cameco
CCJ
$39.4B
| $28.4M | 0.02% |
716,800
-115,700
| -14% | -$4.09M |
|
456
PUT
Comcast
CMCSA
$84B
| $28.2M | 0.02% |
635,400
+111,300
| +21% | +$4.97M |
|
457
Alphabet (Google) Class C
GOOG
$4.17T
| $28M | 0.02% |
212,363
-32,715
| -13% | -$4.25M |
|
458
CALL
AutoZone
AZO
$48.5B
| $27.9M | 0.02% |
11,000
+700
| +7% | +$1.76M |
|
459
CALL
Linde
LIN
$235B
| $27.7M | 0.02% |
74,400
-25,900
| -26% | -$9.86M |
|
460
CALL
Kraft Heinz
KHC
$30.8B
| $27.6M | 0.02% |
819,900
+124,100
| +18% | +$4.29M |
|
461
CALL
Regeneron Pharmaceuticals
REGN
$68.3B
| $27.6M | 0.02% |
33,500
-6,600
| -16% | -$5.19M |
|
462
CALL
UBS Group
UBS
$173B
| $27.4M | 0.02% |
1,111,200
-61,100
| -5% | -$1.43M |
|
463
PUT
C3.ai
AI
$1.27B
| $27.2M | 0.02% |
1,067,400
-105,000
| -9% | -$3.51M |
|
|
464
CALL
Biogen
BIIB
$29.2B
| $27.1M | 0.02% |
105,500
+26,900
| +34% | +$7.19M |
|
465
CALL
General Mills
GIS
$19.7B
| $27.1M | 0.02% |
423,600
+190,500
| +82% | +$13.5M |
|
466
PUT
Thermo Fisher Scientific
TMO
$196B
| $26.9M | 0.02% |
53,200
+2,300
| +5% | +$1.23M |
|
467
CALL
Domino's
DPZ
$10.6B
| $26.6M | 0.02% |
70,200
-11,000
| -14% | -$4.23M |
|
468
PUT
Charter Communications
CHTR
$15.9B
| $26.6M | 0.02% |
60,400
-4,000
| -6% | -$1.66M |
|
469
PUT
Expedia Group
EXPE
$31.3B
| $26.4M | 0.02% |
256,600
-3,800
| -1% | -$419K |
|
470
AT&T
T
$160B
| $26.3M | 0.02% |
1,750,233
+645,489
| +58% | +$9.46M |
|
471
PUT
Mercado Libre
MELI
$91.2B
| $26.2M | 0.02% |
20,700
-58,700
| -74% | -$74.7M |
|
472
PUT
BP
BP
$112B
| $26.1M | 0.02% |
675,300
-96,300
| -12% | -$3.57M |
|
473
CALL
Trade Desk
TTD
$8.26B
| $26.1M | 0.02% |
334,300
-163,100
| -33% | -$13.2M |
|
474
CALL
Caesars Entertainment
CZR
$6.1B
| $26M | 0.02% |
561,700
+233,700
| +71% | +$12.4M |
|
475
PUT
Cloudflare
NET
$95.5B
| $25.9M | 0.02% |
410,900
-252,200
| -38% | -$16.1M |
|
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.