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 | |
|---|---|---|---|---|---|---|
3251
New York Times
NYT
$11.7B
| $822K | ﹤0.01% |
+14,330
| New | +$817K |
|
3252
FS KKR Capital
FSK
$3.04B
| $820K | ﹤0.01% |
54,960
+54,807
| +35,822% | +$1.04M |
|
3253
PUT
Boise Cascade
BCC
$2.75B
| $819K | ﹤0.01% |
10,600
+10,300
| +3,433% | +$882K |
|
3254
PUT
Dave & Buster's
PLAY
$363M
| $819K | ﹤0.01% |
45,100
-30,400
| -40% | -$799K |
|
3255
PUT
Air Products & Chemicals
APD
$65.2B
| $818K | ﹤0.01% |
3,000
+1,000
| +50% | +$289K |
|
3256
CALL
Brown-Forman Class B
BF.B
$12.6B
| $818K | ﹤0.01% |
30,300
-38,100
| -56% | -$1.1M |
|
3257
CALL
UGI
UGI
$7.91B
| $818K | ﹤0.01% |
24,600
-9,800
| -28% | -$343K |
|
3258
PUT
Vornado Realty Trust
VNO
$7.43B
| $818K | ﹤0.01% |
20,200
-103,700
| -84% | -$4.04M |
|
|
ONC
3259
CALL
BeOne Medicines Ltd
ONC
$33.8B
| $817K | ﹤0.01% |
2,400
+2,100
| +700% | +$638K |
|
3260
CALL
Fox Class B
FOX
$21.3B
| $816K | ﹤0.01% |
13,000
+5,500
| +73% | +$290K |
|
3261
PUT
RingCentral
RNG
$4.5B
| $816K | ﹤0.01% |
28,800
+9,800
| +52% | +$285K |
|
3262
RLX Technology
RLX
$2.49B
| $815K | ﹤0.01% |
310,210
+71,837
| +30% | +$171K |
|
3263
PUT
Consolidated Edison
ED
$41.1B
| $814K | ﹤0.01% |
8,100
-47,800
| -86% | -$4.8M |
|
3264
CALL
Icahn Enterprises
IEP
$5.19B
| $813K | ﹤0.01% |
96,600
-20,300
| -17% | -$178K |
|
3265
CALL
Achieve Life Sciences
ACHV
$634M
| $812K | ﹤0.01% |
257,900
+256,900
| +25,690% | +$705K |
|
3266
PUT
Methanex
MEOH
$4.19B
| $811K | ﹤0.01% |
20,400
+12,800
| +168% | +$455K |
|
3267
CALL
Xylem
XYL
$28.6B
| $811K | ﹤0.01% |
5,500
+4,100
| +293% | +$569K |
|
3268
Rapid7
RPD
$643M
| $810K | ﹤0.01% |
43,244
-17,942
| -29% | -$379K |
|
3269
CALL
Brookfield Renewable
BEP
$9.74B
| $809K | ﹤0.01% |
31,400
-3,500
| -10% | -$90.2K |
|
3270
PUT
NOV
NOV
$7.35B
| $809K | ﹤0.01% |
61,100
-38,000
| -38% | -$491K |
|
3271
PUT
Arch Capital
ACGL
$36.3B
| $807K | ﹤0.01% |
8,900
+6,800
| +324% | +$610K |
|
|
ORLA
3272
Orla Mining
ORLA
$3.56B
| $807K | ﹤0.01% |
+74,779
| New | +$801K |
|
3273
Altimmune
ALT
$576M
| $805K | ﹤0.01% |
213,709
+113,742
| +114% | +$439K |
|
3274
CALL
abrdn Physical Silver Shares ETF
SIVR
$4.06B
| $805K | ﹤0.01% |
18,100
-23,500
| -56% | -$885K |
|
3275
Editas Medicine
EDIT
$411M
| $804K | ﹤0.01% |
231,863
+95,406
| +70% | +$266K |
|
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.