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 | |
|---|---|---|---|---|---|---|
|
IDEX
3651
CALL
DELISTED
Ideanomics, Inc. Common Stock
IDEX
| $395K | ﹤0.01% |
162,900
+161,698
| +13,452% | +$1.08M |
|
3652
CALL
Immunocore
IMCR
$1.7B
| $394K | ﹤0.01% |
7,600
-2,100
| -22% | -$124K |
|
3653
Paycom
PAYC
$7.54B
| $394K | ﹤0.01% |
+1,520
| New | +$463K |
|
3654
Universal Health Services
UHS
$10.1B
| $394K | ﹤0.01% |
+3,135
| New | +$428K |
|
3655
CALL
STAG Industrial
STAG
$7.79B
| $393K | ﹤0.01% |
11,400
+2,900
| +34% | +$105K |
|
3656
PUT
Celestica
CLS
$40.3B
| $392K | ﹤0.01% |
16,000
+8,500
| +113% | +$174K |
|
|
TWKS
3657
CALL
DELISTED
Thoughtworks Holding, Inc. Common Stock
TWKS
| $392K | ﹤0.01% |
96,300
+29,300
| +44% | +$166K |
|
|
LTC
3658
PUT
LTC Properties
LTC
$2.14B
| $391K | ﹤0.01% |
12,200
+11,100
| +1,009% | +$366K |
|
3659
PUT
Madison Square Garden
MSGE
$3.65B
| $391K | ﹤0.01% |
11,900
+11,800
| +11,800% | +$390K |
|
|
CIR
3660
CALL
DELISTED
CIRCOR International, Inc
CIR
| $390K | ﹤0.01% |
7,000
-5,800
| -45% | -$323K |
|
3661
Franklin Resources
BEN
$17.3B
| $389K | ﹤0.01% |
+15,842
| New | +$428K |
|
3662
Tidewater
TDW
$3.71B
| $389K | ﹤0.01% |
5,478
-4,363
| -44% | -$275K |
|
3663
PUT
Rollins
ROL
$18.8B
| $388K | ﹤0.01% |
10,400
-40,700
| -80% | -$1.64M |
|
3664
CALL
Aspen Aerogels
ASPN
$364M
| $387K | ﹤0.01% |
45,000
+34,100
| +313% | +$242K |
|
3665
CALL
Geron
GERN
$930M
| $387K | ﹤0.01% |
182,900
-367,300
| -67% | -$997K |
|
3666
Repligen
RGEN
$8.2B
| $386K | ﹤0.01% |
2,433
-293
| -11% | -$47.9K |
|
|
LTHM
3667
PUT
DELISTED
Livent Corporation
LTHM
| $386K | ﹤0.01% |
21,000
-73,300
| -78% | -$1.68M |
|
3668
CALL
Cooper-Standard Automotive
CPS
$526M
| $385K | ﹤0.01% |
28,700
+11,900
| +71% | +$189K |
|
3669
PUT
Palomar
PLMR
$3.79B
| $385K | ﹤0.01% |
7,600
+7,100
| +1,420% | +$388K |
|
3670
PUT
Baytex Energy
BTE
$2.86B
| $384K | ﹤0.01% |
87,100
+84,100
| +2,803% | +$330K |
|
|
EB
3671
CALL
DELISTED
Eventbrite
EB
| $384K | ﹤0.01% |
39,000
+19,300
| +98% | +$198K |
|
3672
CALL
Oxford Industries
OXM
$613M
| $384K | ﹤0.01% |
4,000
+3,900
| +3,900% | +$396K |
|
3673
CALL
Sonos
SONO
$2B
| $384K | ﹤0.01% |
29,800
+3,800
| +15% | +$56.4K |
|
3674
Regenxbio
RGNX
$615M
| $383K | ﹤0.01% |
23,305
+8,033
| +53% | +$146K |
|
3675
ProShares Ultra Semiconductors
USD
$2.35B
| $383K | ﹤0.01% |
39,836
+24,680
| +163% | +$262K |
|
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.