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Simplex Trading Portfolio holdings
AUM
$184B
Turnover
28.44%
1-Year Est. Return
51.71%
Simplex Trading is a market maker that trades for its own account, mainly in US stock options and options on futures, using software it builds itself. Its work pairs software developers with data-driven traders. It was founded in Chicago in 2004, and Erik Swanson, who joined straight out of college as a trader, has been its chief executive since 2014. It also invests in early-stage financial and technology start-ups.
This Fund
S&P 500
This Quarter Est. Return
-0.22%
1 Year Est. Return
+51.71%
3 Year Est. Return
+194.66%
5 Year Est. Return
+164.83%
10 Year Est. Return
+968.67%
AUM
$184B
AUM Growth
+$13.3B
(+7.8%)
Cap. Flow
-$519M
Cap. Flow % of AUM
Cap. Flow %
-0.28%
Top 10 Holdings %
Top 10 Hldgs %
50.68%
Holding
10,644
New
1,493
Increased
3,697
Reduced
3,633
Closed
1,534
Avg Time Held
Equity + Options
3
years
Top 10 Avg Time Held
Equity + Options
3.9
years
Top 20 Avg Time Held
Equity + Options
4.3
years
Avg Time Held Equity only
0.5
years
Top 10 Avg Time Held Equity only
0.5
years
Top 20 Avg Time Held Equity only
0.4
years
Top Buys
| Rank | Stock | Value |
|---|---|---|
| 1 |
iShares 20+ Year Treasury Bond ETF
TLT
|
+$92.6M |
| 2 |
iShares iBoxx $ High Yield Corporate Bond ETF
HYG
|
+$80.6M |
| 3 |
Amazon
AMZN
|
+$26.3M |
| 4 |
State Street Industrial Select Sector SPDR ETF
XLI
|
+$25.7M |
| 5 |
SPDR Gold Trust
GLD
|
+$20.7M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
Alphabet (Google) Class A
GOOGL
|
+$128M |
| 2 |
NVIDIA
NVDA
|
+$97.8M |
| 3 |
Tesla
TSLA
|
+$53.9M |
| 4 |
Micron Technology
MU
|
+$50M |
| 5 |
United States Oil Fund
USO
|
+$49.2M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Miscellaneous | 98.84% |
| 2 | Technology | 0.45% |
| 3 | Consumer Discretionary | 0.14% |
| 4 | Healthcare | 0.14% |
| 5 | Financials | 0.1% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | Held Since | |
|---|---|---|---|---|---|---|---|
2426
PUT
Moody's
MCO
$88.8B
| $1.32M | ﹤0.01% |
2,900
-2,200
| -43% | -$1.07M |
2017 Q4
35 quarters
|
|
2427
CALL
Sanmina
SANM
$8.54B
| $1.31M | ﹤0.01% |
6,100
+4,500
| +281% | +$917K |
2025 Q2
5 quarters
|
|
2428
CALL
CBRE Group
CBRE
$38.8B
| $1.31M | ﹤0.01% |
10,200
-8,000
| -44% | -$1.15M |
2016 Q4
39 quarters
|
|
2429
PUT
Biogen
BIIB
$37.5B
| $1.31M | ﹤0.01% |
5,800
-9,900
| -63% | -$2.1M |
2021 Q2
21 quarters
|
|
2430
CALL
Rockwell Automation
ROK
$45.1B
| $1.31M | ﹤0.01% |
3,000
-2,900
| -49% | -$1.29M |
2021 Q1
22 quarters
|
|
2431
CALL
United Therapeutics
UTHR
$25.4B
| $1.3M | ﹤0.01% |
2,400
+1,300
| +118% | +$672K |
2026 Q1
2 quarters
|
|
2432
CALL
Kopin
KOPN
$672M
| $1.3M | ﹤0.01% |
282,700
+58,500
| +26% | +$254K |
2021 Q2
21 quarters
|
|
2433
First Solar
FSLR
$19.1B
| $1.3M | ﹤0.01% |
7,418
-20,516
| -73% | -$4.34M |
2026 Q2
1 quarter
|
|
2434
PUT
Elbit Systems
ESLT
$34B
| $1.3M | ﹤0.01% |
1,900
-1,100
| -37% | -$835K |
2024 Q4
7 quarters
|
|
2435
Casey's General Stores
CASY
$26.4B
| $1.3M | ﹤0.01% |
2,129
+1,767
| +488% | +$1.36M |
2026 Q2
1 quarter
|
|
2436
PUT
Cheesecake Factory
CAKE
$5.47B
| $1.29M | ﹤0.01% |
12,300
+5,000
| +68% | +$497K |
2016 Q2
41 quarters
|
|
2437
CALL
MSCI
MSCI
$48.1B
| $1.29M | ﹤0.01% |
2,400
+600
| +33% | +$343K |
2016 Q3
40 quarters
|
|
2438
Mobileye
MBLY
$4.91B
| $1.29M | ﹤0.01% |
174,898
+7,806
| +5% | +$66.9K |
2024 Q2
9 quarters
|
|
2439
CALL
ZoomInfo Technologies
GTM
$983M
| $1.29M | ﹤0.01% |
340,800
+200,300
| +143% | +$728K |
2020 Q2
25 quarters
|
|
2440
CALL
Sphere Entertainment
SPHR
$4.59B
| $1.29M | ﹤0.01% |
9,600
+5,100
| +113% | +$757K |
2021 Q1
22 quarters
|
|
2441
British American Tobacco
BTI
$131B
| $1.29M | ﹤0.01% |
+23,707
| New | +$1.38M |
2026 Q3
0 quarters
|
|
2442
PUT
Compass
COMP
$7.87B
| $1.29M | ﹤0.01% |
145,200
+108,000
| +290% | +$1.22M |
2021 Q2
21 quarters
|
|
2443
PUT
Organon & Co
OGN
$3.65B
| $1.29M | ﹤0.01% |
94,100
-7,700
| -8% | -$105K |
2021 Q2
21 quarters
|
|
2444
CALL
Lightwave Logic
LWLG
$547M
| $1.29M | ﹤0.01% |
257,700
-22,100
| -8% | -$137K |
2021 Q4
19 quarters
|
|
2445
CALL
BrightSpring Health Services
BTSG
$14.5B
| $1.29M | ﹤0.01% |
22,700
-7,400
| -25% | -$466K |
2026 Q1
2 quarters
|
|
2446
PUT
CoreCivic
CXW
$2.82B
| $1.29M | ﹤0.01% |
39,900
-16,000
| -29% | -$519K |
2016 Q3
40 quarters
|
|
2447
CALL
DELISTED
Arcosa
ACA
| $1.29M | ﹤0.01% |
8,800
+7,800
| +780% | +$1.13M |
2025 Q2
5 quarters
|
|
2448
PUT
Vipshop
VIPS
$6.26B
| $1.29M | ﹤0.01% |
102,800
+77,700
| +310% | +$1.07M |
2014 Q4
47 quarters
|
|
2449
Zoetis
ZTS
$33.5B
| $1.29M | ﹤0.01% |
18,415
-68,919
| -79% | -$5.15M |
2025 Q3
4 quarters
|
|
2450
CALL
Chesapeake Utilities
CPK
$3.55B
| $1.28M | ﹤0.01% |
+10,000
| New | +$1.32M |
2026 Q3
0 quarters
|
|
Similar funds
Simplex Trading's Q3 2026 Portfolio in Review
As of Q3 2026, Simplex Trading held 10,644 positions worth $184B, up 7.8% from $171B the previous quarter. Its ten largest holdings account for 51% of the portfolio.
Simplex Trading's Q3 2026 filing shows 1,493 new, 3,697 increased, 3,633 reduced and 1,534 closed positions. Its largest new stake was iShares iBoxx $ High Yield Corporate Bond ETF: 1,017,542 shares worth $78.6M. The largest sale was Alphabet (Google) Class A, an estimated $128M.
By sector, the portfolio is most concentrated in Miscellaneous at 99% of assets, up from 98% a quarter earlier, followed by Technology and Consumer Discretionary.
- Simplex Trading's largest Q3 2026 buy was iShares iBoxx $ High Yield Corporate Bond ETF: 1,017,542 shares worth $78.6M.
- Simplex Trading added most to iShares 20+ Year Treasury Bond ETF in Q3 2026, an estimated $92.6M increase.
- Simplex Trading's biggest Q3 2026 reduction was NVIDIA, cutting an estimated $97.8M.
- Simplex Trading fully exited Alphabet (Google) Class A in Q3 2026, selling an estimated $128M.
- Simplex Trading's ten largest holdings make up 51% of its $184B portfolio in Q3 2026.
- Simplex Trading opened 1,493 new positions and closed 1,534 in Q3 2026.
- Simplex Trading's portfolio value rose 7.8% quarter-over-quarter to $184B.
Based on Simplex Trading's 13F filing for Q3 2026, filed 4 Nov 2026.