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 | |
|---|---|---|---|---|---|---|
|
THS
4426
CALL
DELISTED
Treehouse Foods
THS
| $187K | ﹤0.01% |
4,300
+3,300
| +330% | +$158K |
|
4427
CALL
National Fuel Gas
NFG
$7.69B
| $186K | ﹤0.01% |
3,600
+3,300
| +1,100% | +$174K |
|
4428
CALL
Scholastic
SCHL
$774M
| $186K | ﹤0.01% |
4,900
+3,700
| +308% | +$154K |
|
4429
CALL
Energizer
ENR
$1.47B
| $185K | ﹤0.01% |
5,800
-15,100
| -72% | -$517K |
|
4430
CALL
Forward Air
FWRD
$461M
| $185K | ﹤0.01% |
+2,700
| New | +$238K |
|
4431
PUT
Patterson-UTI
PTEN
$3.54B
| $185K | ﹤0.01% |
13,400
+4,800
| +56% | +$70.2K |
|
4432
CALL
Qfin Holdings
QFIN
$1.68B
| $185K | ﹤0.01% |
12,100
+2,000
| +20% | +$34.1K |
|
|
VRTV
4433
PUT
DELISTED
VERITIV CORPORATION
VRTV
| $185K | ﹤0.01% |
+1,100
| New | +$171K |
|
4434
Loews
L
$24.5B
| $184K | ﹤0.01% |
+2,922
| New | +$182K |
|
4435
PUT
Progress Software
PRGS
$1.75B
| $184K | ﹤0.01% |
3,500
-6,200
| -64% | -$363K |
|
4436
PUT
Teradata
TDC
$2.88B
| $184K | ﹤0.01% |
4,100
-6,300
| -61% | -$308K |
|
|
ONIT
4437
Onity Group
ONIT
$342M
| $184K | ﹤0.01% |
7,111
+7,055
| +12,598% | +$212K |
|
4438
Atomera
ATOM
$173M
| $183K | ﹤0.01% |
29,281
+8,218
| +39% | +$58.6K |
|
4439
PUT
Coursera
COUR
$1.77B
| $183K | ﹤0.01% |
9,800
+6,900
| +238% | +$110K |
|
4440
CALL
LiveWire
LVWR
$530M
| $183K | ﹤0.01% |
26,500
-20,100
| -43% | -$214K |
|
4441
PUT
PDS Biotechnology
PDSB
$37.4M
| $183K | ﹤0.01% |
36,400
-1,100
| -3% | -$6.03K |
|
4442
CALL
Pacer Trendpilot US Large Cap ETF
PTLC
$3.19B
| $183K | ﹤0.01% |
3,900
-2,400
| -38% | -$99.5K |
|
|
NVEI
4443
PUT
DELISTED
Nuvei Corporation Subordinate Voting Shares
NVEI
| $183K | ﹤0.01% |
12,200
+5,400
| +79% | +$125K |
|
4444
Coherus Oncology
CHRS
$217M
| $182K | ﹤0.01% |
48,893
-58,943
| -55% | -$272K |
|
4445
CALL
Krispy Kreme
DNUT
$562M
| $182K | ﹤0.01% |
14,600
+1,000
| +7% | +$14K |
|
4446
State Street SPDR S&P Software & Services ETF
XSW
$442M
| $182K | ﹤0.01% |
+1,440
| New | +$192K |
|
4447
CALL
Arbutus Biopharma
ABUS
$847M
| $181K | ﹤0.01% |
89,500
-31,700
| -26% | -$66.5K |
|
4448
PUT
American Coastal Insurance
ACIC
$536M
| $181K | ﹤0.01% |
24,700
+12,500
| +102% | +$80.9K |
|
4449
PUT
Coca-Cola Europacific Partners
CCEP
$49.1B
| $181K | ﹤0.01% |
2,900
+1,000
| +53% | +$63.6K |
|
|
GLDD
4450
DELISTED
Great Lakes Dredge & Dock
GLDD
| $181K | ﹤0.01% |
+22,714
| New | +$188K |
|
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.