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 | |
|---|---|---|---|---|---|---|
4626
Direxion Daily Semiconductor Bear 3X ETF
SOXS
$2.6B
| $156K | ﹤0.01% |
7
-76
| -92% | -$1.53M |
|
|
EVBG
4627
CALL
DELISTED
Everbridge, Inc. Common Stock
EVBG
| $156K | ﹤0.01% |
7,000
-5,400
| -44% | -$139K |
|
4628
Global X Artificial Intelligence & Technology ETF
AIQ
$8.89B
| $155K | ﹤0.01% |
5,766
+1,182
| +26% | +$33.2K |
|
4629
PUT
BlueLinx
BXC
$430M
| $155K | ﹤0.01% |
1,900
-100
| -5% | -$8.78K |
|
4630
PUT
Customers Bancorp
CUBI
$2.66B
| $155K | ﹤0.01% |
4,500
+2,800
| +165% | +$101K |
|
4631
PUT
Evolent Health
EVH
$371M
| $155K | ﹤0.01% |
5,700
+600
| +12% | +$16.7K |
|
|
MITT
4632
TPG Mortgage Investment Trust
MITT
$228M
| $155K | ﹤0.01% |
28,020
+396
| +1% | +$2.51K |
|
4633
PUT
Pentair
PNR
$10.6B
| $155K | ﹤0.01% |
2,400
-800
| -25% | -$53.8K |
|
4634
Atlassian
TEAM
$26.5B
| $155K | ﹤0.01% |
+771
| New | +$146K |
|
4635
PUT
Trinity Capital Inc.
TRIN
$1.58B
| $155K | ﹤0.01% |
11,200
-41,700
| -79% | -$604K |
|
4636
PUT
Beazer Homes USA
BZH
$888M
| $154K | ﹤0.01% |
6,200
+200
| +3% | +$5.77K |
|
4637
CALL
Federal Realty Investment Trust
FRT
$10.9B
| $154K | ﹤0.01% |
1,700
+700
| +70% | +$69K |
|
4638
PUT
Gran Tierra Energy
GTE
$236M
| $154K | ﹤0.01% |
22,300
+13,900
| +165% | +$88.9K |
|
|
RVPH
4639
PUT
DELISTED
REVIVA PHARMA HLDGS INC
RVPH
| $154K | ﹤0.01% |
1,580
-770
| -33% | -$71.8K |
|
|
STR
4640
CALL
DELISTED
Sitio Royalties
STR
| $154K | ﹤0.01% |
6,400
+2,300
| +56% | +$59.2K |
|
4641
Lear
LEA
$7.39B
| $153K | ﹤0.01% |
1,145
-733
| -39% | -$106K |
|
4642
PUT
Seres Therapeutics
MCRB
$45M
| $153K | ﹤0.01% |
3,225
-930
| -22% | -$71K |
|
4643
CALL
Rekor Systems
REKR
$82.6M
| $153K | ﹤0.01% |
54,400
+46,300
| +572% | +$141K |
|
4644
ProShares Ultra Russell2000
UWM
$241M
| $153K | ﹤0.01% |
+5,071
| New | +$174K |
|
|
QVCGA
4645
PUT
DELISTED
QVC Group Inc Series A
QVCGA
| $153K | ﹤0.01% |
5,058
-638
| -11% | -$26.9K |
|
4646
CALL
Carlyle Secured Lending
CGBD
$708M
| $152K | ﹤0.01% |
10,500
+800
| +8% | +$12K |
|
4647
CALL
Clearway Energy Class C
CWEN
$4.79B
| $152K | ﹤0.01% |
7,300
-11,700
| -62% | -$297K |
|
|
4648
Seres Therapeutics
MCRB
$45M
| $152K | ﹤0.01% |
3,210
+159
| +5% | +$12.1K |
|
4649
Redwire
RDW
$1.86B
| $152K | ﹤0.01% |
52,842
+30,419
| +136% | +$97.9K |
|
4650
PUT
Black Hills Corp
BKH
$5.55B
| $151K | ﹤0.01% |
3,000
+2,300
| +329% | +$131K |
|
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.