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 | |
|---|---|---|---|---|---|---|
2451
CALL
JB Hunt Transport Services
JBHT
$27.1B
| $1.76M | ﹤0.01% |
13,100
-13,700
| -51% | -$1.97M |
|
|
NNDM
2452
PUT
Nano Dimension
NNDM
$309M
| $1.76M | ﹤0.01% |
1,119,500
+319,900
| +40% | +$467K |
|
2453
PUT
G-III Apparel Group
GIII
$1.47B
| $1.76M | ﹤0.01% |
66,000
+8,800
| +15% | +$223K |
|
2454
PUT
Terex
TEX
$7.98B
| $1.75M | ﹤0.01% |
34,200
+300
| +0.9% | +$15.3K |
|
2455
PUT
ProShares UltraShort Industrials
SIJ
$5.74M
| $1.75M | ﹤0.01% |
51,450
+51,300
| +34,200% | +$1.24M |
|
2456
CALL
Blackstone Mortgage Trust
BXMT
$2.82B
| $1.75M | ﹤0.01% |
95,100
+14,600
| +18% | +$282K |
|
2457
CALL
KULR Technology Group
KULR
$117M
| $1.75M | ﹤0.01% |
420,400
-210,400
| -33% | -$1.12M |
|
2458
Monster Beverage
MNST
$91.4B
| $1.75M | ﹤0.01% |
+25,983
| New | +$1.62M |
|
2459
CALL
Manchester United
MANU
$3.91B
| $1.75M | ﹤0.01% |
115,300
+30,400
| +36% | +$516K |
|
2460
iShares Russell 1000 Growth ETF
IWF
$122B
| $1.74M | ﹤0.01% |
14,864
-4,172
| -22% | -$465K |
|
2461
BWX Technologies
BWXT
$16B
| $1.74M | ﹤0.01% |
9,436
+687
| +8% | +$111K |
|
2462
CALL
RingCentral
RNG
$4.05B
| $1.74M | ﹤0.01% |
61,300
-26,900
| -30% | -$784K |
|
2463
Burlington
BURL
$22B
| $1.74M | ﹤0.01% |
6,824
-2,135
| -24% | -$580K |
|
2464
PUT
Blackstone Secured Lending
BXSL
$5.41B
| $1.74M | ﹤0.01% |
66,600
+48,200
| +262% | +$1.45M |
|
|
KNGS
2465
PUT
DELISTED
Roundhill S&P Dividend Monarchs ETF
KNGS
| $1.74M | ﹤0.01% |
40,600
+20,000
| +97% | +$855K |
|
2466
PUT
TC Energy
TRP
$73.5B
| $1.74M | ﹤0.01% |
31,900
+13,000
| +69% | +$653K |
|
2467
CALL
Verisk Analytics
VRSK
$26.4B
| $1.74M | ﹤0.01% |
6,900
+6,600
| +2,200% | +$1.81M |
|
2468
CALL
Bentley Systems
BSY
$9.54B
| $1.73M | ﹤0.01% |
33,700
-1,200
| -3% | -$65.7K |
|
2469
PUT
Cummins
CMI
$91.7B
| $1.73M | ﹤0.01% |
4,100
-5,600
| -58% | -$2.15M |
|
2470
CALL
Agios Pharmaceuticals
AGIO
$2.16B
| $1.73M | ﹤0.01% |
43,100
+24,100
| +127% | +$906K |
|
2471
CALL
Primoris Services
PRIM
$4.69B
| $1.73M | ﹤0.01% |
12,600
-200
| -2% | -$21.5K |
|
2472
Omega Healthcare
OHI
$15.4B
| $1.73M | ﹤0.01% |
40,905
+25,227
| +161% | +$1.02M |
|
2473
CALL
Domino's
DPZ
$11B
| $1.73M | ﹤0.01% |
4,000
+1,000
| +33% | +$454K |
|
2474
PUT
Equinor
EQNR
$95.9B
| $1.73M | ﹤0.01% |
70,800
-20,700
| -23% | -$519K |
|
2475
Globalstar
GSAT
$10.2B
| $1.72M | ﹤0.01% |
47,394
+25,469
| +116% | +$730K |
|
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.