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 |
Microsoft
MSFT
|
+$234M |
| 2 |
iShares Russell 2000 ETF
IWM
|
+$97.5M |
| 3 |
Amazon
AMZN
|
+$96.8M |
| 4 |
iShares Bitcoin Trust
IBIT
|
+$80.6M |
| 5 |
Pinduoduo
PDD
|
+$54.9M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
iShares 20+ Year Treasury Bond ETF
TLT
|
+$129M |
| 2 |
Alphabet (Google) Class A
GOOGL
|
+$92.9M |
| 3 |
Broadcom
AVGO
|
+$82.9M |
| 4 |
Alphabet (Google) Class C
GOOG
|
+$68.4M |
| 5 |
Meta Platforms (Facebook)
META
|
+$59.2M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Technology | 0.79% |
| 2 | Consumer Discretionary | 0.3% |
| 3 | Healthcare | 0.25% |
| 4 | Financials | 0.17% |
| 5 | Industrials | 0.09% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
2501
PUT
Navios Maritime Partners
NMM
$2.25B
| $1.66M | ﹤0.01% |
36,900
+15,100
| +69% | +$668K |
|
2502
CALL
Enviri
NVRI
$621M
| $1.66M | ﹤0.01% |
131,000
+30,000
| +30% | +$310K |
|
2503
Dollar Tree
DLTR
$23.1B
| $1.66M | ﹤0.01% |
+17,592
| New | +$1.88M |
|
2504
PUT
DaVita
DVA
$15.1B
| $1.66M | ﹤0.01% |
12,500
-4,200
| -25% | -$577K |
|
2505
PUT
M&T Bank
MTB
$36.2B
| $1.66M | ﹤0.01% |
8,400
+2,700
| +47% | +$530K |
|
2506
CALL
Children's Place
PLCE
$53.6M
| $1.66M | ﹤0.01% |
267,300
-35,300
| -12% | -$192K |
|
2507
CALL
Weibo
WB
$1.9B
| $1.66M | ﹤0.01% |
133,700
-93,500
| -41% | -$1.02M |
|
2508
CALL
Westlake Corp
WLK
$9.46B
| $1.66M | ﹤0.01% |
21,500
-700
| -3% | -$58.3K |
|
2509
CALL
Vestis
VSTS
$2.06B
| $1.65M | ﹤0.01% |
365,000
+18,600
| +5% | +$95.4K |
|
2510
CALL
Republic Services
RSG
$66.7B
| $1.65M | ﹤0.01% |
7,200
-700
| -9% | -$164K |
|
|
JOYY
2511
PUT
JOYY Inc
JOYY
$3.73B
| $1.65M | ﹤0.01% |
28,200
+1,000
| +4% | +$54.9K |
|
2512
CALL
Arvinas
ARVN
$518M
| $1.65M | ﹤0.01% |
193,800
-33,300
| -15% | -$253K |
|
2513
CALL
Red Rock Resorts
RRR
$3.74B
| $1.65M | ﹤0.01% |
27,000
-7,300
| -21% | -$430K |
|
2514
PUT
Alliance Resource Partners
ARLP
$3.18B
| $1.65M | ﹤0.01% |
65,100
-32,900
| -34% | -$823K |
|
2515
CALL
Papa John's
PZZA
$999M
| $1.65M | ﹤0.01% |
34,200
-79,300
| -70% | -$3.67M |
|
2516
PUT
RXO
RXO
$4.23B
| $1.65M | ﹤0.01% |
107,000
-63,600
| -37% | -$1.03M |
|
|
SA
2517
Seabridge Gold
SA
$2.8B
| $1.64M | ﹤0.01% |
68,078
+66,856
| +5,471% | +$1.16M |
|
2518
Ero Copper
ERO
$2.71B
| $1.64M | ﹤0.01% |
81,230
+76,826
| +1,744% | +$1.17M |
|
2519
Dollar General
DG
$25.9B
| $1.64M | ﹤0.01% |
15,892
-36,931
| -70% | -$4.05M |
|
2520
CALL
Williams-Sonoma
WSM
$26.7B
| $1.64M | ﹤0.01% |
8,400
-16,500
| -66% | -$3.15M |
|
2521
CALL
Ferguson
FERG
$44.7B
| $1.64M | ﹤0.01% |
7,300
+6,300
| +630% | +$1.43M |
|
2522
Forward Air
FWRD
$482M
| $1.64M | ﹤0.01% |
63,918
+60,355
| +1,694% | +$1.74M |
|
2523
PUT
Anavex Life Sciences
AVXL
$222M
| $1.64M | ﹤0.01% |
184,000
+103,900
| +130% | +$1.05M |
|
2524
PUT
Biohaven
BHVN
$2.16B
| $1.63M | ﹤0.01% |
108,900
+80,700
| +286% | +$1.17M |
|
2525
PUT
Pebblebrook Hotel Trust
PEB
$2.16B
| $1.63M | ﹤0.01% |
+143,500
| New | +$1.55M |
|
Similar funds
Simplex Trading's Q3 2025 Portfolio in Review
As of Q3 2025, Simplex Trading held 10,358 positions worth $195B, up 12% from $175B the previous quarter. Its ten largest holdings account for 46% of the portfolio.
Simplex Trading's Q3 2025 filing shows 1,743 new, 3,828 increased, 3,250 reduced and 1,308 closed positions. Its largest new stake was Microsoft: 458,309 shares worth $237M. The largest sale was iShares 20+ Year Treasury Bond ETF, an estimated $129M.
By sector, the portfolio is most concentrated in Technology at 0.79% of assets, up from 0.74% a quarter earlier, followed by Consumer Discretionary and Healthcare.
- Simplex Trading's largest Q3 2025 buy was Microsoft: 458,309 shares worth $237M.
- Simplex Trading added most to iShares Russell 2000 ETF in Q3 2025, an estimated $97.5M increase.
- Simplex Trading's biggest Q3 2025 reduction was Alphabet (Google) Class A, cutting an estimated $92.9M.
- Simplex Trading fully exited iShares 20+ Year Treasury Bond ETF in Q3 2025, selling an estimated $129M.
- Simplex Trading's ten largest holdings make up 46% of its $195B portfolio in Q3 2025.
- Simplex Trading opened 1,743 new positions and closed 1,308 in Q3 2025.
- Simplex Trading's portfolio value rose 12% quarter-over-quarter to $195B.
Based on Simplex Trading's 13F filing for Q3 2025, filed 12 Nov 2025.