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 | |
|---|---|---|---|---|---|---|
6851
BlackSky Technology
BKSY
$843M
| $15K | ﹤0.01% |
1,664
-1,116
| -40% | -$14.2K |
|
6852
CALL
Barnes & Noble Education
BNED
$435M
| $15K | ﹤0.01% |
+139
| New | +$18.8K |
|
6853
CALL
CBIZ
CBZ
$2.95B
| $15K | ﹤0.01% |
+300
| New | +$16.2K |
|
|
6854
CBIZ
CBZ
$2.95B
| $15K | ﹤0.01% |
+304
| New | +$16.4K |
|
6855
CALL
Cadre Holdings
CDRE
$1.31B
| $15K | ﹤0.01% |
600
-2,400
| -80% | -$58.6K |
|
|
CHMI
6856
PUT
Cherry Hill Mortgage Investment Corp
CHMI
$82.3M
| $15K | ﹤0.01% |
4,200
+1,900
| +83% | +$7.78K |
|
|
CTLP
6857
CALL
DELISTED
Cantaloupe
CTLP
| $15K | ﹤0.01% |
2,500
-19,300
| -89% | -$142K |
|
|
CTLP
6858
DELISTED
Cantaloupe
CTLP
| $15K | ﹤0.01% |
2,537
-172,914
| -99% | -$1.27M |
|
6859
PUT
Casella Waste Systems
CWST
$5.76B
| $15K | ﹤0.01% |
200
-11,200
| -98% | -$918K |
|
6860
iMGP DBi Managed Futures Strategy ETF
DBMF
$4B
| $15K | ﹤0.01% |
+520
| New | +$14.5K |
|
6861
PUT
Evergy
EVRG
$19.4B
| $15K | ﹤0.01% |
300
+200
| +200% | +$11.4K |
|
6862
First American
FAF
$7.98B
| $15K | ﹤0.01% |
274
-779
| -74% | -$46.8K |
|
6863
Gladstone Capital
GLAD
$427M
| $15K | ﹤0.01% |
+813
| New | +$16.8K |
|
6864
Grove Collaborative
GROV
$45.8M
| $15K | ﹤0.01% |
5,727
+4,862
| +562% | +$12.3K |
|
6865
CALL
Hillman Solutions
HLMN
$1.57B
| $15K | ﹤0.01% |
1,900
-100
| -5% | -$909 |
|
|
HTBK
6866
CALL
DELISTED
Heritage Commerce
HTBK
| $15K | ﹤0.01% |
1,800
+1,200
| +200% | +$10.7K |
|
6867
ImmunityBio
IBRX
$7.15B
| $15K | ﹤0.01% |
+8,883
| New | +$17.8K |
|
6868
PUT
Ichor Holdings
ICHR
$2.17B
| $15K | ﹤0.01% |
500
-4,600
| -90% | -$158K |
|
|
IRS
6869
PUT
IRSA Inversiones y Representaciones
IRS
$1.31B
| $15K | ﹤0.01% |
2,584
+2,010
| +350% | +$15.1K |
|
6870
CALL
Kodiak Sciences
KOD
$2.5B
| $15K | ﹤0.01% |
8,500
+600
| +8% | +$2.12K |
|
6871
CALL
Kilroy Realty
KRC
$4.59B
| $15K | ﹤0.01% |
500
+200
| +67% | +$6.94K |
|
6872
PUT
Lazard
LAZ
$4B
| $15K | ﹤0.01% |
500
-700
| -58% | -$23.5K |
|
6873
PUT
LivaNova
LIVN
$4.47B
| $15K | ﹤0.01% |
300
-900
| -75% | -$49.3K |
|
6874
MDU Resources
MDU
$4.18B
| $15K | ﹤0.01% |
1,408
-57,359
| -98% | -$660K |
|
6875
Martin Midstream Partners
MMLP
$93.5M
| $15K | ﹤0.01% |
5,610
+4,612
| +462% | +$11.9K |
|
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.