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 | |
|---|---|---|---|---|---|---|
4376
Helmerich & Payne
HP
$3.34B
| $319K | ﹤0.01% |
14,463
+7,664
| +113% | +$141K |
|
4377
PUT
PBF Energy
PBF
$7.49B
| $319K | ﹤0.01% |
10,600
-52,500
| -83% | -$1.37M |
|
4378
PUT
Radiant Logistics
RLGT
$400M
| $319K | ﹤0.01% |
54,100
+51,600
| +2,064% | +$318K |
|
4379
PUT
UFP Technologies
UFPT
$1.97B
| $319K | ﹤0.01% |
1,600
+1,400
| +700% | +$308K |
|
|
MNTN
4380
CALL
MNTN Inc
MNTN
$707M
| $319K | ﹤0.01% |
17,200
+16,100
| +1,464% | +$366K |
|
4381
CALL
AMC Global Media
AMCX
$450M
| $318K | ﹤0.01% |
38,700
+3,300
| +9% | +$22.9K |
|
4382
Chord Energy
CHRD
$7.68B
| $318K | ﹤0.01% |
3,208
+1,845
| +135% | +$194K |
|
4383
PUT
JELD-WEN Holding
JELD
$110M
| $318K | ﹤0.01% |
+64,900
| New | +$347K |
|
4384
CALL
AllianceBernstein
AB
$3.47B
| $317K | ﹤0.01% |
8,300
-4,200
| -34% | -$168K |
|
4385
Angi Inc
ANGI
$247M
| $316K | ﹤0.01% |
+19,446
| New | +$333K |
|
4386
PUT
American Resources Corp
AREC
$183M
| $316K | ﹤0.01% |
117,100
+112,500
| +2,446% | +$192K |
|
4387
PUT
Bloomin' Brands
BLMN
$754M
| $316K | ﹤0.01% |
44,200
+32,100
| +265% | +$258K |
|
4388
Braze
BRZE
$3.02B
| $316K | ﹤0.01% |
+11,130
| New | +$316K |
|
4389
Centrus Energy
LEU
$3.14B
| $316K | ﹤0.01% |
+1,021
| New | +$226K |
|
4390
CALL
Varonis Systems
VRNS
$4.67B
| $316K | ﹤0.01% |
5,500
-20,800
| -79% | -$1.15M |
|
|
BRR
4391
CALL
ProCap Financial Inc
BRR
$151M
| $316K | ﹤0.01% |
+31,300
| New | +$322K |
|
4392
PUT
A.O. Smith
AOS
$8.55B
| $315K | ﹤0.01% |
4,300
+3,600
| +514% | +$257K |
|
4393
iShares Europe ETF
IEV
$1.64B
| $315K | ﹤0.01% |
4,815
+375
| +8% | +$24K |
|
4394
PUT
Karyopharm Therapeutics
KPTI
$155M
| $315K | ﹤0.01% |
+48,200
| New | +$259K |
|
|
FWDI
4395
PUT
Forward Industries Inc
FWDI
$280M
| $314K | ﹤0.01% |
+12,300
| New | +$203K |
|
4396
CALL
Armstrong World Industries
AWI
$7.37B
| $313K | ﹤0.01% |
1,600
-12,900
| -89% | -$2.4M |
|
4397
CALL
Biomea Fusion
BMEA
$88.2M
| $313K | ﹤0.01% |
155,200
+10,300
| +7% | +$18.9K |
|
4398
Vanguard World Funds Extended Duration ETF
EDV
$3.26B
| $312K | ﹤0.01% |
4,570
+3,488
| +322% | +$230K |
|
4399
Vanguard Total World Stock ETF
VT
$75.3B
| $312K | ﹤0.01% |
+2,268
| New | +$301K |
|
4400
CALL
WisdomTree
WT
$2.79B
| $312K | ﹤0.01% |
22,500
-1,900
| -8% | -$25.4K |
|
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.