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 | |
|---|---|---|---|---|---|---|
2426
PUT
Worthington Steel
WS
$1.8B
| $1.82M | ﹤0.01% |
59,900
+33,400
| +126% | +$1.07M |
|
2427
PUT
Jack Henry & Associates
JKHY
$10.7B
| $1.82M | ﹤0.01% |
+12,200
| New | +$2.03M |
|
|
SVM
2428
CALL
Silvercorp Metals
SVM
$2.13B
| $1.81M | ﹤0.01% |
287,300
+178,100
| +163% | +$872K |
|
2429
Urban Outfitters
URBN
$5.99B
| $1.81M | ﹤0.01% |
25,406
+11,720
| +86% | +$862K |
|
2430
GoodRx Holdings
GDRX
$1B
| $1.81M | ﹤0.01% |
428,341
+385,048
| +889% | +$1.69M |
|
2431
PUT
Elastic
ESTC
$6.1B
| $1.81M | ﹤0.01% |
21,400
-2,400
| -10% | -$202K |
|
|
RNAM
2432
CALL
DELISTED
Avidity Biosciences
RNAM
| $1.81M | ﹤0.01% |
41,500
+32,900
| +383% | +$1.33M |
|
2433
CALL
Syndax Pharmaceuticals
SNDX
$1.84B
| $1.8M | ﹤0.01% |
117,300
+71,700
| +157% | +$938K |
|
|
HIMX
2434
CALL
Himax Technologies
HIMX
$2.2B
| $1.8M | ﹤0.01% |
204,000
+10,900
| +6% | +$93.5K |
|
2435
CALL
Kodak
KODK
$806M
| $1.8M | ﹤0.01% |
280,700
+152,300
| +119% | +$959K |
|
|
ODP
2436
DELISTED
ODP
ODP
| $1.8M | ﹤0.01% |
64,630
+63,815
| +7,830% | +$1.31M |
|
2437
Sempra
SRE
$60.8B
| $1.8M | ﹤0.01% |
19,989
-16,508
| -45% | -$1.34M |
|
2438
CALL
TKO Group
TKO
$13.5B
| $1.8M | ﹤0.01% |
8,900
-17,700
| -67% | -$3.23M |
|
2439
PUT
GlobalFoundries
GFS
$29.4B
| $1.79M | ﹤0.01% |
50,000
+28,500
| +133% | +$1.02M |
|
|
HOUS
2440
DELISTED
Anywhere Real Estate
HOUS
| $1.79M | ﹤0.01% |
169,195
+43,871
| +35% | +$258K |
|
2441
Valley National Bancorp
VLY
$7.93B
| $1.78M | ﹤0.01% |
168,297
+157,702
| +1,488% | +$1.58M |
|
2442
CALL
Otis Worldwide
OTIS
$27.4B
| $1.78M | ﹤0.01% |
19,500
+11,900
| +157% | +$1.08M |
|
2443
CALL
Vital Farms
VITL
$558M
| $1.78M | ﹤0.01% |
43,300
-1,500
| -3% | -$65.1K |
|
2444
CALL
United Natural Foods
UNFI
$3.01B
| $1.78M | ﹤0.01% |
47,300
-1,000
| -2% | -$27.4K |
|
2445
CALL
Becton Dickinson
BDX
$43.1B
| $1.78M | ﹤0.01% |
9,500
-38,800
| -80% | -$7.21M |
|
2446
PUT
Kimberly-Clark
KMB
$36.4B
| $1.78M | ﹤0.01% |
14,300
-2,500
| -15% | -$323K |
|
2447
PUT
Perion Network
PERI
$367M
| $1.77M | ﹤0.01% |
184,100
-25,600
| -12% | -$256K |
|
2448
PUT
Jefferies Financial Group
JEF
$12.9B
| $1.77M | ﹤0.01% |
27,000
+8,800
| +48% | +$537K |
|
2449
PUT
SM Energy
SM
$7.96B
| $1.76M | ﹤0.01% |
70,600
+54,700
| +344% | +$1.48M |
|
2450
CALL
Qiagen
QGEN
$8.53B
| $1.76M | ﹤0.01% |
39,400
+38,200
| +3,183% | +$1.83M |
|
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.